File: //opt/LibreChat/node_modules/intersection-observer/intersection-observer-test.js
/**
* Copyright 2016 Google Inc. All Rights Reserved.
*
* Licensed under the W3C SOFTWARE AND DOCUMENT NOTICE AND LICENSE.
*
* https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
*
*/
// Sets the timeout to three times the poll interval to ensure all updates
// happen (especially in slower browsers). Native implementations get the
// standard 100ms timeout defined in the spec.
var ASYNC_TIMEOUT = IntersectionObserver.prototype.THROTTLE_TIMEOUT * 3 || 100;
var io;
var noop = function() {};
// References to DOM elements, which are accessible to any test
// and reset prior to each test so state isn't shared.
var rootEl;
var grandParentEl;
var parentEl;
var targetEl1;
var targetEl2;
var targetEl3;
var targetEl4;
describe('IntersectionObserver', function() {
before(function() {
// If the browser running the tests doesn't support MutationObserver,
// fall back to polling.
if (!('MutationObserver' in window)) {
IntersectionObserver.prototype.POLL_INTERVAL =
IntersectionObserver.prototype.THROTTLE_TIMEOUT || 100;
}
});
beforeEach(function() {
addStyles();
addFixtures();
});
afterEach(function() {
if (io && 'disconnect' in io) io.disconnect();
io = null;
removeStyles();
removeFixtures();
});
describe('constructor', function() {
it('throws when callback is not a function', function() {
expect(function() {
io = new IntersectionObserver(null);
}).to.throwException();
});
it('instantiates root correctly', function() {
io = new IntersectionObserver(noop);
expect(io.root).to.be(null);
io = new IntersectionObserver(noop, {root: rootEl});
expect(io.root).to.be(rootEl);
});
it('throws when root is not an Element', function() {
expect(function() {
io = new IntersectionObserver(noop, {root: 'foo'});
}).to.throwException();
});
it('instantiates rootMargin correctly', function() {
io = new IntersectionObserver(noop, {rootMargin: '10px'});
expect(io.rootMargin).to.be('10px 10px 10px 10px');
io = new IntersectionObserver(noop, {rootMargin: '10px -5%'});
expect(io.rootMargin).to.be('10px -5% 10px -5%');
io = new IntersectionObserver(noop, {rootMargin: '10px 20% 0px'});
expect(io.rootMargin).to.be('10px 20% 0px 20%');
io = new IntersectionObserver(noop, {rootMargin: '0px 0px -5% 5px'});
expect(io.rootMargin).to.be('0px 0px -5% 5px');
// TODO(philipwalton): the polyfill supports fractional pixel and
// percentage values, but the native Chrome implementation does not,
// at least not in what it reports `rootMargin` to be.
if (!supportsNativeIntersectionObserver()) {
io = new IntersectionObserver(noop, {rootMargin: '-2.5% -8.5px'});
expect(io.rootMargin).to.be('-2.5% -8.5px -2.5% -8.5px');
}
});
// TODO(philipwalton): this doesn't throw in FF, consider readding once
// expected behavior is clarified.
// it('throws when rootMargin is not in pixels or pecernt', function() {
// expect(function() {
// io = new IntersectionObserver(noop, {rootMargin: '0'});
// }).to.throwException();
// });
// Chrome's implementation in version 51 doesn't include the thresholds
// property, but versions 52+ do.
if ('thresholds' in IntersectionObserver.prototype) {
it('instantiates thresholds correctly', function() {
io = new IntersectionObserver(noop);
expect(io.thresholds).to.eql([0]);
io = new IntersectionObserver(noop, {threshold: 0.5});
expect(io.thresholds).to.eql([0.5]);
io = new IntersectionObserver(noop, {threshold: [0.25, 0.5, 0.75]});
expect(io.thresholds).to.eql([0.25, 0.5, 0.75]);
io = new IntersectionObserver(noop, {threshold: [1, .5, 0]});
expect(io.thresholds).to.eql([0, .5, 1]);
});
}
it('throws when a threshold is not a number', function() {
expect(function() {
io = new IntersectionObserver(noop, {threshold: ['foo']});
}).to.throwException();
});
it('throws when a threshold value is not between 0 and 1', function() {
expect(function() {
io = new IntersectionObserver(noop, {threshold: [0, -1]});
}).to.throwException();
});
});
describe('observe', function() {
it('throws when target is not an Element', function() {
expect(function() {
io = new IntersectionObserver(noop);
io.observe(null);
}).to.throwException();
});
it('fills in x and y in the resulting rects', function(done) {
io = new IntersectionObserver(function(records) {
expect(records.length).to.be(1);
var entry = records[0];
expect(entry.rootBounds.x).to.be(entry.rootBounds.left);
expect(entry.rootBounds.y).to.be(entry.rootBounds.top);
expect(entry.boundingClientRect.x).to.be(entry.boundingClientRect.left);
expect(entry.boundingClientRect.y).to.be(entry.boundingClientRect.top);
expect(entry.intersectionRect.x).to.be(entry.intersectionRect.left);
expect(entry.intersectionRect.y).to.be(entry.intersectionRect.top);
done();
}, {root: rootEl});
targetEl2.style.top = '-40px';
io.observe(targetEl1);
});
it('triggers for all targets when observing begins', function(done) {
io = new IntersectionObserver(function(records) {
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[1].intersectionRatio).to.be(0);
done();
}, {root: rootEl});
targetEl2.style.top = '-40px';
io.observe(targetEl1);
io.observe(targetEl2);
});
it('triggers for existing targets when observing begins after monitoring has begun', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
io.observe(targetEl1);
setTimeout(function() {
io.observe(targetEl2);
setTimeout(function() {
expect(spy.callCount).to.be(2);
done();
}, ASYNC_TIMEOUT);
}, ASYNC_TIMEOUT);
});
it('triggers with the correct arguments', function(done) {
io = new IntersectionObserver(function(records, observer) {
expect(records.length).to.be(2);
expect(records[0] instanceof IntersectionObserverEntry).to.be.ok();
expect(records[1] instanceof IntersectionObserverEntry).to.be.ok();
expect(observer).to.be(io);
expect(this).to.be(io);
done();
}, {root: rootEl});
targetEl2.style.top = '-40px';
io.observe(targetEl1);
io.observe(targetEl2);
});
it('handles container elements with non-visible overflow',
function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
runSequence([
function(done) {
io.observe(targetEl1);
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.left = '-40px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(0);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
parentEl.style.overflow = 'visible';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
it('observes one target at a single threshold correctly', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl, threshold: 0.5});
runSequence([
function(done) {
targetEl1.style.left = '-5px';
io.observe(targetEl1);
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be.greaterThan(0.5);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.left = '-15px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be.lessThan(0.5);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.left = '-25px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.left = '-10px';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(0.5);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
it('observes multiple targets at multiple thresholds correctly',
function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {
root: rootEl,
threshold: [1, 0.5, 0]
});
runSequence([
function(done) {
targetEl1.style.top = '0px';
targetEl1.style.left = '-15px';
targetEl2.style.top = '-5px';
targetEl2.style.left = '0px';
targetEl3.style.top = '0px';
targetEl3.style.left = '205px';
io.observe(targetEl1);
io.observe(targetEl2);
io.observe(targetEl3);
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(3);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(0.25);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(0.75);
expect(records[2].target).to.be(targetEl3);
expect(records[2].intersectionRatio).to.be(0);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.top = '0px';
targetEl1.style.left = '-5px';
targetEl2.style.top = '-15px';
targetEl2.style.left = '0px';
targetEl3.style.top = '0px';
targetEl3.style.left = '195px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(3);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(0.75);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(0.25);
expect(records[2].target).to.be(targetEl3);
expect(records[2].intersectionRatio).to.be(0.25);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.top = '0px';
targetEl1.style.left = '5px';
targetEl2.style.top = '-25px';
targetEl2.style.left = '0px';
targetEl3.style.top = '0px';
targetEl3.style.left = '185px';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(3);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(1);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(0);
expect(records[2].target).to.be(targetEl3);
expect(records[2].intersectionRatio).to.be(0.75);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.top = '0px';
targetEl1.style.left = '15px';
targetEl2.style.top = '-35px';
targetEl2.style.left = '0px';
targetEl3.style.top = '0px';
targetEl3.style.left = '175px';
setTimeout(function() {
expect(spy.callCount).to.be(4);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].target).to.be(targetEl3);
expect(records[0].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
it('handles rootMargin properly', function(done) {
parentEl.style.overflow = 'visible';
targetEl1.style.top = '0px';
targetEl1.style.left = '-20px';
targetEl2.style.top = '-20px';
targetEl2.style.left = '0px';
targetEl3.style.top = '0px';
targetEl3.style.left = '200px';
targetEl4.style.top = '180px';
targetEl4.style.left = '180px';
runSequence([
function(done) {
io = new IntersectionObserver(function(records) {
records = sortRecords(records);
expect(records.length).to.be(4);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(1);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(.5);
expect(records[2].target).to.be(targetEl3);
expect(records[2].intersectionRatio).to.be(.5);
expect(records[3].target).to.be(targetEl4);
expect(records[3].intersectionRatio).to.be(1);
io.disconnect();
done();
}, {root: rootEl, rootMargin: '10px'});
io.observe(targetEl1);
io.observe(targetEl2);
io.observe(targetEl3);
io.observe(targetEl4);
},
function(done) {
io = new IntersectionObserver(function(records) {
records = sortRecords(records);
expect(records.length).to.be(4);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(0.5);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(0);
expect(records[2].target).to.be(targetEl3);
expect(records[2].intersectionRatio).to.be(0.5);
expect(records[3].target).to.be(targetEl4);
expect(records[3].intersectionRatio).to.be(0.5);
io.disconnect();
done();
}, {root: rootEl, rootMargin: '-10px 10%'});
io.observe(targetEl1);
io.observe(targetEl2);
io.observe(targetEl3);
io.observe(targetEl4);
},
function(done) {
io = new IntersectionObserver(function(records) {
records = sortRecords(records);
expect(records.length).to.be(4);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(0.5);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(0);
expect(records[2].target).to.be(targetEl3);
expect(records[2].intersectionRatio).to.be(0);
expect(records[3].target).to.be(targetEl4);
expect(records[3].intersectionRatio).to.be(0.5);
io.disconnect();
done();
}, {root: rootEl, rootMargin: '-5% -2.5% 0px'});
io.observe(targetEl1);
io.observe(targetEl2);
io.observe(targetEl3);
io.observe(targetEl4);
},
function(done) {
io = new IntersectionObserver(function(records) {
records = sortRecords(records);
expect(records.length).to.be(4);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(0.5);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(0.5);
expect(records[2].target).to.be(targetEl3);
expect(records[2].intersectionRatio).to.be(0);
expect(records[3].target).to.be(targetEl4);
expect(records[3].intersectionRatio).to.be(0.25);
io.disconnect();
done();
}, {root: rootEl, rootMargin: '5% -2.5% -10px -190px'});
io.observe(targetEl1);
io.observe(targetEl2);
io.observe(targetEl3);
io.observe(targetEl4);
}
], done);
});
it('handles targets on the boundary of root', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
runSequence([
function(done) {
targetEl1.style.top = '0px';
targetEl1.style.left = '-21px';
targetEl2.style.top = '-20px';
targetEl2.style.left = '0px';
io.observe(targetEl1);
io.observe(targetEl2);
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].target).to.be(targetEl1);
expect(records[0].isIntersecting).to.be(false);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].target).to.be(targetEl2);
expect(records[1].isIntersecting).to.be(true);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.top = '0px';
targetEl1.style.left = '-20px';
targetEl2.style.top = '-21px';
targetEl2.style.left = '0px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].target).to.be(targetEl1);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].target).to.be(targetEl2);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.top = '-20px';
targetEl1.style.left = '200px';
targetEl2.style.top = '200px';
targetEl2.style.left = '200px';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].target).to.be(targetEl2);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
it('handles zero-size targets within the root coordinate space',
function(done) {
io = new IntersectionObserver(function(records) {
expect(records.length).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.be(1);
done();
}, {root: rootEl});
targetEl1.style.top = '0px';
targetEl1.style.left = '0px';
targetEl1.style.width = '0px';
targetEl1.style.height = '0px';
io.observe(targetEl1);
});
it('handles elements with display set to none', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
runSequence([
function(done) {
rootEl.style.display = 'none';
io.observe(targetEl1);
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].isIntersecting).to.be(false);
expect(records[0].intersectionRatio).to.be(0);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
rootEl.style.display = 'block';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
parentEl.style.display = 'none';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].isIntersecting).to.be(false);
expect(records[0].intersectionRatio).to.be(0);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
parentEl.style.display = 'block';
setTimeout(function() {
expect(spy.callCount).to.be(4);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
targetEl1.style.display = 'none';
setTimeout(function() {
expect(spy.callCount).to.be(5);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].isIntersecting).to.be(false);
expect(records[0].intersectionRatio).to.be(0);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
it('handles target elements not yet added to the DOM', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
// targetEl5 is initially not in the DOM. Note that this element must be
// created outside of the addFixtures() function to catch the IE11 error
// described here: https://github.com/w3c/IntersectionObserver/pull/205
var targetEl5 = document.createElement('div');
targetEl5.setAttribute('id', 'target5');
runSequence([
function(done) {
io.observe(targetEl5);
setTimeout(function() {
// Initial observe should trigger with no intersections since
// targetEl5 is not yet in the DOM.
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].isIntersecting).to.be(false);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].target).to.be(targetEl5);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Adding targetEl5 inside rootEl should trigger.
parentEl.insertBefore(targetEl5, targetEl2);
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].target).to.be(targetEl5);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Removing an ancestor of targetEl5 should trigger.
grandParentEl.parentNode.removeChild(grandParentEl);
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].target).to.be(targetEl5);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Adding the previously removed targetEl5 (via grandParentEl)
// back directly inside rootEl should trigger.
rootEl.appendChild(targetEl5);
setTimeout(function() {
expect(spy.callCount).to.be(4);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].target).to.be(targetEl5);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Removing rootEl should trigger.
rootEl.parentNode.removeChild(rootEl);
setTimeout(function() {
expect(spy.callCount).to.be(5);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].target).to.be(targetEl5);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
if ('attachShadow' in Element.prototype) {
it('handles targets in shadow DOM', function(done) {
grandParentEl.attachShadow({mode: 'open'});
grandParentEl.shadowRoot.appendChild(parentEl);
io = new IntersectionObserver(function(records) {
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(1);
done();
}, {root: rootEl});
io.observe(targetEl1);
});
it('handles roots in shadow DOM', function(done) {
var shadowRoot = grandParentEl.attachShadow({mode: 'open'});
shadowRoot.innerHTML =
'<style>' +
'#slot-parent {' +
' position: relative;' +
' width: 400px;' +
' height: 200px;' +
'}' +
'</style>' +
'<div id="slot-parent"><slot></slot></div>';
var slotParent = shadowRoot.getElementById('slot-parent');
io = new IntersectionObserver(function(records) {
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(1);
done();
}, {root: slotParent});
io.observe(targetEl1);
});
}
it('handles sub-root element scrolling', function(done) {
io = new IntersectionObserver(function(records) {
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(1);
done();
}, {root: rootEl});
io.observe(targetEl3);
setTimeout(function() {
parentEl.scrollLeft = 40;
}, 0);
});
// Only run this test in browsers that support CSS transitions.
if ('transform' in document.documentElement.style &&
'transition' in document.documentElement.style) {
it('supports CSS transitions and transforms', function(done) {
targetEl1.style.top = '220px';
targetEl1.style.left = '220px';
io = new IntersectionObserver(function(records) {
expect(records.length).to.be(1);
// Chrome's native implementation sometimes incorrectly reports
// the intersection ratio as a number > 1.
expect(records[0].intersectionRatio >= 1);
done();
}, {root: rootEl, threshold: [1]});
// CSS transitions that are slower than the default throttle timeout
// require polling to detect, which can be set on a per-instance basis.
if (!supportsNativeIntersectionObserver()) {
io.POLL_INTERVAL = 100;
}
io.observe(targetEl1);
setTimeout(function() {
targetEl1.style.transform = 'translateX(-40px) translateY(-40px)';
}, 0);
});
}
it('uses the viewport when no root is specified', function(done) {
io = new IntersectionObserver(function(records) {
var viewportWidth =
document.documentElement.clientWidth || document.body.clientWidth;
var viewportHeight =
document.documentElement.clientHeight || document.body.clientHeight;
expect(records.length).to.be(1);
expect(records[0].rootBounds.top).to.be(0);
expect(records[0].rootBounds.left).to.be(0);
expect(records[0].rootBounds.right).to.be(viewportWidth);
expect(records[0].rootBounds.width).to.be(viewportWidth);
expect(records[0].rootBounds.bottom).to.be(viewportHeight);
expect(records[0].rootBounds.height).to.be(viewportHeight);
done();
});
// Ensures targetEl1 is visible in the viewport before observing.
window.scrollTo(0, 0);
rootEl.style.position = 'absolute';
rootEl.style.top = '0px';
rootEl.style.left = '0px';
io.observe(targetEl1);
});
});
describe('takeRecords', function() {
it('supports getting records before the callback is invoked',
function(done) {
var lastestRecords = [];
io = new IntersectionObserver(function(records) {
lastestRecords = lastestRecords.concat(records);
}, {root: rootEl});
io.observe(targetEl1);
window.requestAnimationFrame && requestAnimationFrame(function() {
lastestRecords = lastestRecords.concat(io.takeRecords());
});
setTimeout(function() {
expect(lastestRecords.length).to.be(1);
expect(lastestRecords[0].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
});
});
describe('unobserve', function() {
it('removes targets from the internal store', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
runSequence([
function(done) {
targetEl1.style.top = targetEl2.style.top = '0px';
targetEl1.style.left = targetEl2.style.left = '0px';
io.observe(targetEl1);
io.observe(targetEl2);
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(1);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.unobserve(targetEl1);
targetEl1.style.top = targetEl2.style.top = '0px';
targetEl1.style.left = targetEl2.style.left = '-40px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].target).to.be(targetEl2);
expect(records[0].intersectionRatio).to.be(0);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.unobserve(targetEl2);
targetEl1.style.top = targetEl2.style.top = '0px';
targetEl1.style.left = targetEl2.style.left = '0px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
});
describe('disconnect', function() {
it('removes all targets and stops listening for changes', function(done) {
var spy = sinon.spy();
io = new IntersectionObserver(spy, {root: rootEl});
runSequence([
function(done) {
targetEl1.style.top = targetEl2.style.top = '0px';
targetEl1.style.left = targetEl2.style.left = '0px';
io.observe(targetEl1);
io.observe(targetEl2);
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].target).to.be(targetEl1);
expect(records[0].intersectionRatio).to.be(1);
expect(records[1].target).to.be(targetEl2);
expect(records[1].intersectionRatio).to.be(1);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
targetEl1.style.top = targetEl2.style.top = '0px';
targetEl1.style.left = targetEl2.style.left = '-40px';
setTimeout(function() {
expect(spy.callCount).to.be(1);
done();
}, ASYNC_TIMEOUT);
}
], done);
});
});
describe('iframe', function() {
var iframe;
var documentElement, body;
var iframeTargetEl1, iframeTargetEl2;
var bodyWidth;
beforeEach(function(done) {
iframe = document.createElement('iframe');
iframe.setAttribute('frameborder', '0');
iframe.setAttribute('scrolling', 'yes');
iframe.style.position = 'fixed';
iframe.style.top = '0px';
iframe.style.width = '100px';
iframe.style.height = '200px';
iframe.onerror = function() {
done(new Error('iframe initialization failed'));
};
iframe.onload = function() {
iframe.onload = null;
iframeWin = iframe.contentWindow;
iframeDoc = iframeWin.document;
iframeDoc.open();
iframeDoc.write('<!DOCTYPE html><html><body>');
iframeDoc.write('<style>');
iframeDoc.write('body {margin: 0}');
iframeDoc.write('.target {height: 200px; margin-bottom: 2px; background: blue;}');
iframeDoc.write('</style>');
iframeDoc.close();
// Ensure the documentElement and body are always sorted on top. See
// `sortRecords` for more info.
documentElement = iframeDoc.documentElement;
body = iframeDoc.body;
documentElement.id = 'A1';
body.id = 'A1';
function createTarget(id, bg) {
var target = iframeDoc.createElement('div');
target.id = id;
target.className = 'target';
target.style.background = bg;
iframeDoc.body.appendChild(target);
return target;
}
iframeTargetEl1 = createTarget('target1', 'blue');
iframeTargetEl2 = createTarget('target2', 'green');
bodyWidth = iframeDoc.body.clientWidth;
done();
};
iframe.src = 'about:blank';
rootEl.appendChild(iframe);
});
afterEach(function() {
rootEl.removeChild(iframe);
});
function rect(r) {
return {
y: typeof r.y == 'number' ? r.y : r.top,
x: typeof r.x == 'number' ? r.x : r.left,
top: r.top,
left: r.left,
width: r.width != null ? r.width : r.right - r.left,
height: r.height != null ? r.height : r.bottom - r.top,
right: r.right != null ? r.right : r.left + r.width,
bottom: r.bottom != null ? r.bottom : r.top + r.height
};
}
function getRootRect(doc) {
var html = doc.documentElement;
var body = doc.body;
return rect({
top: 0,
left: 0,
right: html.clientWidth || body.clientWidth,
width: html.clientWidth || body.clientWidth,
bottom: html.clientHeight || body.clientHeight,
height: html.clientHeight || body.clientHeight
});
}
describe('same-origin iframe', function() {
it('iframe targets do not intersect with a top root element', function(done) {
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(records[0].isIntersecting).to.be(false);
expect(records[1].isIntersecting).to.be(false);
done();
io.disconnect();
}, {root: rootEl});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('triggers for all targets in top-level root', function(done) {
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.be(1);
expect(records[1].isIntersecting).to.be(false);
expect(records[1].intersectionRatio).to.be(0);
// The rootBounds is for the document's root.
expect(records[0].rootBounds.height).to.be(innerHeight);
done();
io.disconnect();
});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('triggers for all targets in iframe-level root', function(done) {
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[1].intersectionRatio).to.be(1);
// The rootBounds is for the document's root.
expect(rect(records[0].rootBounds)).
to.eql(rect(iframeDoc.body.getBoundingClientRect()));
done();
io.disconnect();
}, {root: iframeDoc.body});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('calculates rects for a fully visible frame', function(done) {
iframe.style.top = '0px';
iframe.style.height = '300px';
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(rect(records[0].rootBounds)).to.eql(getRootRect(document));
expect(rect(records[1].rootBounds)).to.eql(getRootRect(document));
// The target1 is fully visible.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
expect(rect(records[0].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[0].intersectionRect)).to.eql(clientRect1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.be(1);
// The target2 is partially visible.
var clientRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
// The bottom is clipped off.
bottom: 300
});
expect(rect(records[1].boundingClientRect)).to.eql(clientRect2);
expect(rect(records[1].intersectionRect)).to.eql(intersectRect2);
expect(records[1].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be.within(0.48, 0.5); // ~0.5
done();
io.disconnect();
});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('calculates rects for a fully visible and offset frame', function(done) {
iframe.style.top = '10px';
iframe.style.height = '300px';
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(rect(records[0].rootBounds)).to.eql(getRootRect(document));
expect(rect(records[1].rootBounds)).to.eql(getRootRect(document));
// The target1 is fully visible.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
expect(rect(records[0].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[0].intersectionRect)).to.eql(clientRect1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.be(1);
// The target2 is partially visible.
var clientRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
// The bottom is clipped off.
bottom: 300
});
expect(rect(records[1].boundingClientRect)).to.eql(clientRect2);
expect(rect(records[1].intersectionRect)).to.eql(intersectRect2);
expect(records[1].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be.within(0.48, 0.5); // ~0.5
done();
io.disconnect();
});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('calculates rects for a clipped frame on top', function(done) {
iframe.style.top = '-10px';
iframe.style.height = '300px';
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(rect(records[0].rootBounds)).to.eql(getRootRect(document));
expect(rect(records[1].rootBounds)).to.eql(getRootRect(document));
// The target1 is clipped at the top by the iframe's clipping.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect1 = rect({
left: 0,
width: bodyWidth,
// Top is clipped.
top: 10,
height: 200 - 10
});
expect(rect(records[0].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[0].intersectionRect)).to.eql(intersectRect1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.within(0.94, 0.96); // ~0.95
// The target2 is partially visible.
var clientRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
// The bottom is clipped off.
bottom: 300
});
expect(rect(records[1].boundingClientRect)).to.eql(clientRect2);
expect(rect(records[1].intersectionRect)).to.eql(intersectRect2);
expect(records[1].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be.within(0.48, 0.5); // ~0.49
done();
io.disconnect();
});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('calculates rects for a clipped frame on bottom', function(done) {
iframe.style.top = 'auto';
iframe.style.bottom = '-10px';
iframe.style.height = '300px';
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(rect(records[0].rootBounds)).to.eql(getRootRect(document));
expect(rect(records[1].rootBounds)).to.eql(getRootRect(document));
// The target1 is clipped at the top by the iframe's clipping.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
expect(rect(records[0].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[0].intersectionRect)).to.eql(clientRect1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.be(1);
// The target2 is partially visible.
var clientRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect2 = rect({
top: 202,
left: 0,
width: bodyWidth,
// The bottom is clipped off.
bottom: 300 - 10
});
expect(rect(records[1].boundingClientRect)).to.eql(clientRect2);
expect(rect(records[1].intersectionRect)).to.eql(intersectRect2);
expect(records[1].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be.within(0.43, 0.45); // ~0.44
done();
io.disconnect();
});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('calculates rects for a fully visible frame and scrolled', function(done) {
iframe.style.top = '0px';
iframe.style.height = '300px';
iframeWin.scrollTo(0, 10);
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(rect(records[0].rootBounds)).to.eql(getRootRect(document));
expect(rect(records[1].rootBounds)).to.eql(getRootRect(document));
// The target1 is fully visible.
var clientRect1 = rect({
top: -10,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
// Height is only for the visible area.
height: 200 - 10
});
expect(rect(records[0].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[0].intersectionRect)).to.eql(intersectRect1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.within(0.94, 0.96); // ~0.95
// The target2 is partially visible.
var clientRect2 = rect({
top: 202 - 10,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect2 = rect({
top: 202 - 10,
left: 0,
width: bodyWidth,
// The bottom is clipped off.
bottom: 300
});
expect(rect(records[1].boundingClientRect)).to.eql(clientRect2);
expect(rect(records[1].intersectionRect)).to.eql(intersectRect2);
expect(records[1].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be.within(0.53, 0.55); // ~0.54
done();
io.disconnect();
});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('calculates rects for a clipped frame on top and scrolled', function(done) {
iframe.style.top = '-10px';
iframe.style.height = '300px';
iframeWin.scrollTo(0, 10);
var io = new IntersectionObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(2);
expect(rect(records[0].rootBounds)).to.eql(getRootRect(document));
expect(rect(records[1].rootBounds)).to.eql(getRootRect(document));
// The target1 is clipped at the top by the iframe's clipping.
var clientRect1 = rect({
top: -10,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect1 = rect({
left: 0,
width: bodyWidth,
// Top is clipped.
top: 10,
// The height is less by both: offset and scroll.
height: 200 - 10 - 10
});
expect(rect(records[0].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[0].intersectionRect)).to.eql(intersectRect1);
expect(records[0].isIntersecting).to.be(true);
expect(records[0].intersectionRatio).to.within(0.89, 0.91); // ~0.9
// The target2 is partially visible.
var clientRect2 = rect({
top: 202 - 10,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect2 = rect({
top: 202 - 10,
left: 0,
width: bodyWidth,
// The bottom is clipped off.
bottom: 300
});
expect(rect(records[1].boundingClientRect)).to.eql(clientRect2);
expect(rect(records[1].intersectionRect)).to.eql(intersectRect2);
expect(records[1].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be.within(0.53, 0.55); // ~0.54
done();
io.disconnect();
});
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('handles style changes', function(done) {
var spy = sinon.spy();
// When first element becomes invisible, the second element will show.
// And in reverse: when the first element becomes visible again, the
// second element will disappear.
var io = new IntersectionObserver(spy);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeTargetEl1.style.display = 'none';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].isIntersecting).to.be(false);
expect(records[1].intersectionRatio).to.be(1);
expect(records[1].isIntersecting).to.be(true);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeTargetEl1.style.display = '';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
it('handles scroll changes', function(done) {
var spy = sinon.spy();
// Scrolling to the middle of the iframe shows the second box and
// hides the first.
var io = new IntersectionObserver(spy);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeWin.scrollTo(0, 202);
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].isIntersecting).to.be(false);
expect(records[1].intersectionRatio).to.be(1);
expect(records[1].isIntersecting).to.be(true);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeWin.scrollTo(0, 0);
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
it('handles iframe changes', function(done) {
var spy = sinon.spy();
// Iframe goes off screen and returns.
var io = new IntersectionObserver(spy);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
// Top-level bounds.
expect(records[0].rootBounds.height).to.be(innerHeight);
expect(records[0].intersectionRect.height).to.be(200);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Completely off screen.
iframe.style.top = '-202px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].isIntersecting).to.be(false);
// Top-level bounds.
expect(records[0].rootBounds.height).to.be(innerHeight);
expect(records[0].intersectionRect.height).to.be(0);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Partially returns.
iframe.style.top = '-100px';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be.within(0.45, 0.55);
expect(records[0].isIntersecting).to.be(true);
// Top-level bounds.
expect(records[0].rootBounds.height).to.be(innerHeight);
expect(records[0].intersectionRect.height / 200).to.be.within(0.45, 0.55);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
it('continues to monitor until the last target unobserved', function(done) {
var spy = sinon.spy();
// Iframe goes off screen and returns.
var io = new IntersectionObserver(spy);
io.observe(target1);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
expect(spy.lastCall.args[0].length).to.be(3);
// Unobserve one from the main context and one from iframe.
io.unobserve(target1);
io.unobserve(iframeTargetEl2);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Completely off screen.
iframe.style.top = '-202px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
expect(spy.lastCall.args[0].length).to.be(1);
io.unobserve(iframeTargetEl1);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Partially returns.
iframe.style.top = '-100px';
setTimeout(function() {
expect(spy.callCount).to.be(2);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
});
describe('cross-origin iframe', function() {
var ASYNC_TIMEOUT = 300;
var crossOriginUpdater;
beforeEach(function(done) {
Object.defineProperty(iframeWin, 'frameElement', {value: null});
/* Uncomment these lines to force polyfill inside the iframe.
delete iframeWin.IntersectionObserver;
delete iframeWin.IntersectionObserverEntry;
*/
// Install polyfill right into the iframe.
if (!iframeWin.IntersectionObserver) {
var script = iframeDoc.createElement('script');
script.src = 'intersection-observer.js';
script.onload = function() {
if (iframeWin.IntersectionObserver._setupCrossOriginUpdater) {
crossOriginUpdater = iframeWin.IntersectionObserver._setupCrossOriginUpdater();
}
done();
};
iframeDoc.body.appendChild(script);
} else {
done();
}
});
afterEach(function() {
if (IntersectionObserver._resetCrossOriginUpdater) {
IntersectionObserver._resetCrossOriginUpdater();
}
});
function computeRectIntersection(rect1, rect2) {
var top = Math.max(rect1.top, rect2.top);
var bottom = Math.min(rect1.bottom, rect2.bottom);
var left = Math.max(rect1.left, rect2.left);
var right = Math.min(rect1.right, rect2.right);
var width = right - left;
var height = bottom - top;
return (width >= 0 && height >= 0) && {
top: top,
bottom: bottom,
left: left,
right: right,
width: width,
height: height
} || {
top: 0,
bottom: 0,
left: 0,
right: 0,
width: 0,
height: 0
};
}
function checkRootBoundsAreNull(records) {
if (!supportsNativeIntersectionObserver(iframeWin)) {
records.forEach(function(record) {
expect(record.rootBounds).to.be(null);
});
}
}
function applyParentRect(parentRect) {
if (crossOriginUpdater) {
var parentIntersectionRect = computeRectIntersection(
parentRect, getRootRect(document));
crossOriginUpdater(parentRect, parentIntersectionRect);
} else {
iframe.style.top = parentRect.top + 'px';
iframe.style.left = parentRect.left + 'px';
iframe.style.height = parentRect.height + 'px';
iframe.style.width = parentRect.width + 'px';
}
}
function createObserver(callback, options, parentRect) {
var io = new iframeWin.IntersectionObserver(callback, options);
if (parentRect) {
applyParentRect(parentRect);
}
return io;
}
it('calculates rects for a fully visible frame', function(done) {
var parentRect = rect({top: 0, left: 20, height: 300, width: 100});
var io = createObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(3);
checkRootBoundsAreNull(records);
// The documentElement is partially visible.
expect(rect(records[0].boundingClientRect))
.to.eql(rect(documentElement.getBoundingClientRect()));
expect(rect(records[0].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300
}));
expect(records[0].isIntersecting).to.be(true);
// 300 / 404 == ~0.743
expect(records[0].intersectionRatio).to.be.within(0.74, 0.75);
// The document.body is partially visible.
expect(rect(records[1].boundingClientRect))
.to.eql(rect(body.getBoundingClientRect()));
expect(rect(records[1].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300
}));
expect(records[1].isIntersecting).to.be(true);
// 300 / 402 == ~0.746
expect(records[1].intersectionRatio).to.be.within(0.74, 0.75);
// The target1 is fully visible.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
expect(rect(records[2].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[2].intersectionRect)).to.eql(clientRect1);
expect(records[2].isIntersecting).to.be(true);
expect(records[2].intersectionRatio).to.be(1);
done();
io.disconnect();
}, {}, parentRect);
io.observe(documentElement);
io.observe(body);
io.observe(iframeTargetEl1);
});
it('calculates rects for a fully visible and offset frame', function(done) {
var parentRect = rect({top: 10, left: 20, height: 300, width: 100});
var io = createObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(3);
checkRootBoundsAreNull(records);
// The documentElement is partially visible.
expect(rect(records[0].boundingClientRect))
.to.eql(rect(documentElement.getBoundingClientRect()));
expect(rect(records[0].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300
}));
expect(records[0].isIntersecting).to.be(true);
// 300 / 404 == ~0.743
expect(records[0].intersectionRatio).to.be.within(0.74, 0.75);
// The document.body is partially visible.
expect(rect(records[1].boundingClientRect))
.to.eql(rect(body.getBoundingClientRect()));
expect(rect(records[1].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300
}));
expect(records[1].isIntersecting).to.be(true);
// 300 / 402 == ~0.746
expect(records[1].intersectionRatio).to.be.within(0.74, 0.75);
// The target1 is fully visible.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
expect(rect(records[2].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[2].intersectionRect)).to.eql(clientRect1);
expect(records[2].isIntersecting).to.be(true);
expect(records[2].intersectionRatio).to.be(1);
done();
io.disconnect();
}, {}, parentRect);
io.observe(documentElement);
io.observe(body);
io.observe(iframeTargetEl1);
});
it('calculates rects for a clipped frame on top', function(done) {
var parentRect = rect({top: -10, left: 20, height: 300, width: 100});
var io = createObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(3);
checkRootBoundsAreNull(records);
// The documentElement is partially visible.
expect(rect(records[0].boundingClientRect))
.to.eql(rect(documentElement.getBoundingClientRect()));
expect(rect(records[0].intersectionRect)).to.eql(rect({
top: 10,
left: 0,
width: bodyWidth,
height: 300 - 10
}));
expect(records[0].isIntersecting).to.be(true);
// (300 - 10) / 404 == ~0.717
expect(records[0].intersectionRatio).to.be.within(0.71, 0.72);
// The document.body is partially visible.
expect(rect(records[1].boundingClientRect))
.to.eql(rect(body.getBoundingClientRect()));
expect(rect(records[1].intersectionRect)).to.eql(rect({
top: 10,
left: 0,
width: bodyWidth,
height: 300 - 10
}));
expect(records[1].isIntersecting).to.be(true);
// (300 - 10) / 402 == ~0.721
expect(records[1].intersectionRatio).to.be.within(0.72, 0.73);
// The target1 is clipped at the top by the iframe's clipping.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect1 = rect({
left: 0,
width: bodyWidth,
// Top is clipped.
top: 10,
height: 200 - 10
});
expect(rect(records[2].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[2].intersectionRect)).to.eql(intersectRect1);
expect(records[2].isIntersecting).to.be(true);
expect(records[2].intersectionRatio).to.within(0.94, 0.96); // ~0.95
done();
io.disconnect();
}, {}, parentRect);
io.observe(documentElement);
io.observe(body);
io.observe(iframeTargetEl1);
});
it('calculates rects for a clipped frame on bottom', function(done) {
var rootRect = getRootRect(document);
var parentRect = rect({top: rootRect.bottom - 300 + 10, left: 20, height: 300, width: 100});
var io = createObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(3);
checkRootBoundsAreNull(records);
// The documentElement is partially visible.
expect(rect(records[0].boundingClientRect))
.to.eql(rect(documentElement.getBoundingClientRect()));
expect(rect(records[0].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300 - 10
}));
expect(records[0].isIntersecting).to.be(true);
// (300 - 10) / 404 == ~0.717
expect(records[0].intersectionRatio).to.be.within(0.71, 0.72);
// The document.body is partially visible.
expect(rect(records[1].boundingClientRect))
.to.eql(rect(body.getBoundingClientRect()));
expect(rect(records[1].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300 - 10
}));
expect(records[1].isIntersecting).to.be(true);
// (300 - 10) / 402 == ~0.721
expect(records[1].intersectionRatio).to.be.within(0.72, 0.73);
// The target1 is clipped at the top by the iframe's clipping.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
expect(rect(records[2].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[2].intersectionRect)).to.eql(clientRect1);
expect(records[2].isIntersecting).to.be(true);
expect(records[2].intersectionRatio).to.be(1);
done();
io.disconnect();
}, {}, parentRect);
io.observe(documentElement);
io.observe(body);
io.observe(iframeTargetEl1);
});
it('calculates rects for a fully visible and scrolled frame', function(done) {
iframeWin.scrollTo(0, 10);
var parentRect = rect({top: 0, left: 20, height: 300, width: 100});
var io = createObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(3);
checkRootBoundsAreNull(records);
// The documentElement is partially visible.
expect(rect(records[0].boundingClientRect))
.to.eql(rect(documentElement.getBoundingClientRect()));
expect(rect(records[0].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300
}));
expect(records[0].isIntersecting).to.be(true);
// 300 / 404 == ~0.743
expect(records[0].intersectionRatio).to.be.within(0.74, 0.75);
// The document.body is partially visible.
expect(rect(records[1].boundingClientRect))
.to.eql(rect(body.getBoundingClientRect()));
expect(rect(records[1].intersectionRect)).to.eql(rect({
top: 0,
left: 0,
width: bodyWidth,
height: 300
}));
expect(records[1].isIntersecting).to.be(true);
// 300 / 402 == ~0.746
expect(records[1].intersectionRatio).to.be.within(0.74, 0.75);
// The target1 is fully visible.
var clientRect1 = rect({
top: -10,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
// Height is only for the visible area.
height: 200 - 10
});
expect(rect(records[2].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[2].intersectionRect)).to.eql(intersectRect1);
expect(records[2].isIntersecting).to.be(true);
expect(records[2].intersectionRatio).to.within(0.94, 0.96); // ~0.95
done();
io.disconnect();
}, {}, parentRect);
io.observe(documentElement);
io.observe(body);
io.observe(iframeTargetEl1);
});
it('calculates rects for a clipped frame on top and scrolled', function(done) {
iframeWin.scrollTo(0, 10);
var parentRect = rect({top: -10, left: 0, height: 300, width: 100});
var io = createObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(4);
checkRootBoundsAreNull(records);
// The documentElement is partially visible.
expect(rect(records[0].boundingClientRect))
.to.eql(rect(documentElement.getBoundingClientRect()));
expect(rect(records[0].intersectionRect)).to.eql(rect({
top: 10,
left: 0,
width: bodyWidth,
height: 300 - 10
}));
expect(records[0].isIntersecting).to.be(true);
// (300 - 10) / 404 == ~0.717
expect(records[0].intersectionRatio).to.be.within(0.71, 0.72);
// The document.body is partially visible.
expect(rect(records[1].boundingClientRect))
.to.eql(rect(body.getBoundingClientRect()));
expect(rect(records[1].intersectionRect)).to.eql(rect({
top: 10,
left: 0,
width: bodyWidth,
height: 300 - 10
}));
expect(records[1].isIntersecting).to.be(true);
// (300 - 10) / 402 == ~0.721
expect(records[1].intersectionRatio).to.be.within(0.72, 0.73);
// The target1 is clipped at the top by the iframe's clipping.
var clientRect1 = rect({
top: -10,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect1 = rect({
left: 0,
width: bodyWidth,
// Top is clipped.
top: 10,
// The height is less by both: offset and scroll.
height: 200 - 10 - 10
});
expect(rect(records[2].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[2].intersectionRect)).to.eql(intersectRect1);
expect(records[2].isIntersecting).to.be(true);
expect(records[2].intersectionRatio).to.within(0.89, 0.91); // ~0.9
// The target2 is partially visible.
var clientRect2 = rect({
top: 202 - 10,
left: 0,
width: bodyWidth,
height: 200
});
var intersectRect2 = rect({
top: 202 - 10,
left: 0,
width: bodyWidth,
// The bottom is clipped off.
bottom: 300
});
expect(rect(records[3].boundingClientRect)).to.eql(clientRect2);
expect(rect(records[3].intersectionRect)).to.eql(intersectRect2);
expect(records[3].isIntersecting).to.be(true);
expect(records[3].intersectionRatio).to.be.within(0.53, 0.55); // ~0.54
done();
io.disconnect();
}, {}, parentRect);
io.observe(documentElement);
io.observe(body);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
});
it('calculates rects for a fully clipped frame', function(done) {
var parentRect = rect({top: -400, left: 20, height: 300, width: 100});
var io = createObserver(function(unsortedRecords) {
var records = sortRecords(unsortedRecords);
expect(records.length).to.be(3);
checkRootBoundsAreNull(records);
var emptyRect = rect({
top: 0,
left: 0,
width: 0,
height: 0
});
// The documentElement is completely invisible.
expect(rect(records[0].boundingClientRect))
.to.eql(rect(documentElement.getBoundingClientRect()));
expect(rect(records[0].intersectionRect)).to.eql(emptyRect);
expect(records[0].isIntersecting).to.be(false);
expect(records[0].intersectionRatio).to.be(0);
// The document.body is completely invisible.
expect(rect(records[1].boundingClientRect))
.to.eql(rect(body.getBoundingClientRect()));
expect(rect(records[1].intersectionRect)).to.eql(emptyRect);
expect(records[1].isIntersecting).to.be(false);
expect(records[1].intersectionRatio).to.be(0);
// The target1 is completely invisible.
var clientRect1 = rect({
top: 0,
left: 0,
width: bodyWidth,
height: 200
});
expect(rect(records[2].boundingClientRect)).to.eql(clientRect1);
expect(rect(records[2].intersectionRect)).to.eql(emptyRect);
expect(records[2].isIntersecting).to.be(false);
expect(records[2].intersectionRatio).to.be(0);
done();
io.disconnect();
}, {}, parentRect);
io.observe(documentElement);
io.observe(body);
io.observe(iframeTargetEl1);
});
it('blocks until crossOriginUpdater is called first time', function(done) {
if (supportsNativeIntersectionObserver(iframeWin)) {
// Skip: not possible to emulate with the native observer.
done();
return;
}
var spy = sinon.spy();
var parentRect = rect({top: 0, left: 20, height: 300, width: 100});
var io = createObserver(spy, {});
io.observe(iframeTargetEl1);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(0);
// Issue the first update.
crossOriginUpdater(parentRect, null);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
it('doesn\'t block with a root specified', function(done) {
var spy = sinon.spy();
var io = createObserver(spy, {root: body});
io.observe(iframeTargetEl1);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var record = sortRecords(spy.lastCall.args[0])[0];
expect(record.intersectionRatio).to.be(1);
expect(record.isIntersecting).to.be(true);
expect(rect(record.rootBounds)).to.eql(rect(body.getBoundingClientRect()));
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
it('handles style changes', function(done) {
var spy = sinon.spy();
var parentRect = rect({top: 0, left: 0, height: 200, width: 100});
// When first element becomes invisible, the second element will show.
// And in reverse: when the first element becomes visible again, the
// second element will disappear.
var io = createObserver(spy, {}, parentRect);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeTargetEl1.style.display = 'none';
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].isIntersecting).to.be(false);
expect(records[1].intersectionRatio).to.be(1);
expect(records[1].isIntersecting).to.be(true);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeTargetEl1.style.display = '';
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
it('handles scroll changes', function(done) {
var spy = sinon.spy();
var parentRect = rect({top: 0, left: 0, height: 200, width: 100});
// Scrolling to the middle of the iframe shows the second box and
// hides the first.
var io = createObserver(spy, {}, parentRect);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeWin.scrollTo(0, 202);
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].isIntersecting).to.be(false);
expect(records[1].intersectionRatio).to.be(1);
expect(records[1].isIntersecting).to.be(true);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
iframeWin.scrollTo(0, 0);
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
it('handles parent rect changes', function(done) {
var spy = sinon.spy();
var parentRect = rect({top: 0, left: 0, height: 200, width: 100});
// Iframe goes off screen and returns.
var io = createObserver(spy, {}, parentRect);
io.observe(iframeTargetEl1);
io.observe(iframeTargetEl2);
runSequence([
function(done) {
setTimeout(function() {
expect(spy.callCount).to.be(1);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(2);
checkRootBoundsAreNull(records);
expect(records[0].intersectionRatio).to.be(1);
expect(records[0].isIntersecting).to.be(true);
expect(records[1].intersectionRatio).to.be(0);
expect(records[1].isIntersecting).to.be(false);
// Top-level bounds.
expect(records[0].intersectionRect.height).to.be(200);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Completely off screen.
applyParentRect(rect({top: -202, left: 0, height: 200, width: 100}));
setTimeout(function() {
expect(spy.callCount).to.be(2);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
checkRootBoundsAreNull(records);
expect(records[0].intersectionRatio).to.be(0);
expect(records[0].isIntersecting).to.be(false);
// Top-level bounds.
expect(records[0].intersectionRect.height).to.be(0);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
// Partially returns.
applyParentRect(rect({top: -100, left: 0, height: 200, width: 100}));
setTimeout(function() {
expect(spy.callCount).to.be(3);
var records = sortRecords(spy.lastCall.args[0]);
expect(records.length).to.be(1);
checkRootBoundsAreNull(records);
expect(records[0].intersectionRatio).to.be.within(0.45, 0.55);
expect(records[0].isIntersecting).to.be(true);
// Top-level bounds.
expect(records[0].intersectionRect.height / 200).to.be.within(0.45, 0.55);
done();
}, ASYNC_TIMEOUT);
},
function(done) {
io.disconnect();
done();
}
], done);
});
});
});
});
/**
* Runs a sequence of function and when finished invokes the done callback.
* Each function in the sequence is invoked with its own done function and
* it should call that function once it's complete.
* @param {Array<Function>} functions An array of async functions.
* @param {Function} done A final callback to be invoked once all function
* have run.
*/
function runSequence(functions, done) {
var next = functions.shift();
if (next) {
next(function() {
runSequence(functions, done);
});
} else {
done && done();
}
}
/**
* Returns whether or not the current browser has native support for
* IntersectionObserver.
* @param {Window=} win
* @return {boolean} True if native support is detected.
*/
function supportsNativeIntersectionObserver(win) {
win = win || window;
return 'IntersectionObserver' in win &&
win.IntersectionObserver.toString().indexOf('[native code]') > -1;
}
/**
* Sorts an array of records alphebetically by ascending ID. Since the current
* native implementation doesn't sort change entries by `observe` order, we do
* that ourselves for the non-polyfill case. Since all tests call observe
* on targets in sequential order, this should always match.
* https://crbug.com/613679
* @param {Array<IntersectionObserverEntry>} entries The entries to sort.
* @return {Array<IntersectionObserverEntry>} The sorted array.
*/
function sortRecords(entries) {
if (supportsNativeIntersectionObserver()) {
entries = entries.sort(function(a, b) {
return a.target.id < b.target.id ? -1 : 1;
});
}
return entries;
}
/**
* Adds the common styles used by all tests to the page.
*/
function addStyles() {
var styles = document.createElement('style');
styles.id = 'styles';
document.documentElement.appendChild(styles);
var cssText =
'#root {' +
' position: relative;' +
' width: 400px;' +
' height: 200px;' +
' background: #eee' +
'}' +
'#grand-parent {' +
' position: relative;' +
' width: 200px;' +
' height: 200px;' +
'}' +
'#parent {' +
' position: absolute;' +
' top: 0px;' +
' left: 200px;' +
' overflow: hidden;' +
' width: 200px;' +
' height: 200px;' +
' background: #ddd;' +
'}' +
'#target1, #target2, #target3, #target4, #target5 {' +
' position: absolute;' +
' top: 0px;' +
' left: 0px;' +
' width: 20px;' +
' height: 20px;' +
' transform: translateX(0px) translateY(0px);' +
' transition: transform .5s;' +
' background: #f00;' +
'}';
// IE8 doesn't allow setting innerHTML on a <style> element.
if (styles.styleSheet) {
styles.styleSheet.cssText = cssText;
}
else {
styles.innerHTML = cssText;
}
}
/**
* Adds the DOM fixtures used by all tests to the page and assigns them to
* global variables so they can be referenced within the tests.
*/
function addFixtures() {
var fixtures = document.createElement('div');
fixtures.id = 'fixtures';
fixtures.innerHTML =
'<div id="root">' +
' <div id="grand-parent">' +
' <div id="parent">' +
' <div id="target1"></div>' +
' <div id="target2"></div>' +
' <div id="target3"></div>' +
' <div id="target4"></div>' +
' </div>' +
' </div>' +
'</div>';
document.body.appendChild(fixtures);
rootEl = document.getElementById('root');
grandParentEl = document.getElementById('grand-parent');
parentEl = document.getElementById('parent');
targetEl1 = document.getElementById('target1');
targetEl2 = document.getElementById('target2');
targetEl3 = document.getElementById('target3');
targetEl4 = document.getElementById('target4');
}
/**
* Removes the common styles from the page.
*/
function removeStyles() {
var styles = document.getElementById('styles');
styles.parentNode.removeChild(styles);
}
/**
* Removes the DOM fixtures from the page and resets the global references.
*/
function removeFixtures() {
var fixtures = document.getElementById('fixtures');
fixtures.parentNode.removeChild(fixtures);
rootEl = null;
grandParentEl = null;
parentEl = null;
targetEl1 = null;
targetEl2 = null;
targetEl3 = null;
targetEl4 = null;
}