StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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1078 lines
35 KiB
1078 lines
35 KiB
/**
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* Copyright 2016 Google Inc. All Rights Reserved.
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*
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* Licensed under the W3C SOFTWARE AND DOCUMENT NOTICE AND LICENSE.
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*
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* https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
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*
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*/
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// Sets the timeout to three times the poll interval to ensure all updates
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// happen (especially in slower browsers). Native implementations get the
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// standard 100ms timeout defined in the spec.
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var ASYNC_TIMEOUT = IntersectionObserver.prototype.THROTTLE_TIMEOUT * 3 || 100;
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var io;
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var noop = function() {};
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// References to DOM elements, which are accessible to any test
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// and reset prior to each test so state isn't shared.
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var rootEl;
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var grandParentEl;
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var parentEl;
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var targetEl1;
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var targetEl2;
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var targetEl3;
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var targetEl4;
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describe('IntersectionObserver', function() {
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before(function() {
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// If the browser running the tests doesn't support MutationObserver,
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// fall back to polling.
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if (!('MutationObserver' in window)) {
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IntersectionObserver.prototype.POLL_INTERVAL =
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IntersectionObserver.prototype.THROTTLE_TIMEOUT || 100;
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}
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});
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beforeEach(function() {
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addStyles();
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addFixtures();
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});
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afterEach(function() {
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if (io && 'disconnect' in io) io.disconnect();
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io = null;
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removeStyles();
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removeFixtures();
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});
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describe('constructor', function() {
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it('throws when callback is not a function', function() {
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expect(function() {
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io = new IntersectionObserver(null);
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}).to.throwException();
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});
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it('instantiates root correctly', function() {
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io = new IntersectionObserver(noop);
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expect(io.root).to.be(null);
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io = new IntersectionObserver(noop, {root: rootEl});
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expect(io.root).to.be(rootEl);
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});
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it('throws when root is not an Element', function() {
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expect(function() {
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io = new IntersectionObserver(noop, {root: 'foo'});
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}).to.throwException();
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});
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it('instantiates rootMargin correctly', function() {
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io = new IntersectionObserver(noop, {rootMargin: '10px'});
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expect(io.rootMargin).to.be('10px 10px 10px 10px');
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io = new IntersectionObserver(noop, {rootMargin: '10px -5%'});
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expect(io.rootMargin).to.be('10px -5% 10px -5%');
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io = new IntersectionObserver(noop, {rootMargin: '10px 20% 0px'});
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expect(io.rootMargin).to.be('10px 20% 0px 20%');
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io = new IntersectionObserver(noop, {rootMargin: '0px 0px -5% 5px'});
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expect(io.rootMargin).to.be('0px 0px -5% 5px');
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// TODO(philipwalton): the polyfill supports fractional pixel and
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// percentage values, but the native Chrome implementation does not,
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// at least not in what it reports `rootMargin` to be.
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if (!supportsNativeIntersectionObserver()) {
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io = new IntersectionObserver(noop, {rootMargin: '-2.5% -8.5px'});
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expect(io.rootMargin).to.be('-2.5% -8.5px -2.5% -8.5px');
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}
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});
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// TODO(philipwalton): this doesn't throw in FF, consider readding once
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// expected behavior is clarified.
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// it('throws when rootMargin is not in pixels or pecernt', function() {
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// expect(function() {
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// io = new IntersectionObserver(noop, {rootMargin: '0'});
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// }).to.throwException();
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// });
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// Chrome's implementation in version 51 doesn't include the thresholds
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// property, but versions 52+ do.
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if ('thresholds' in IntersectionObserver.prototype) {
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it('instantiates thresholds correctly', function() {
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io = new IntersectionObserver(noop);
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expect(io.thresholds).to.eql([0]);
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io = new IntersectionObserver(noop, {threshold: 0.5});
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expect(io.thresholds).to.eql([0.5]);
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io = new IntersectionObserver(noop, {threshold: [0.25, 0.5, 0.75]});
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expect(io.thresholds).to.eql([0.25, 0.5, 0.75]);
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io = new IntersectionObserver(noop, {threshold: [1, .5, 0]});
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expect(io.thresholds).to.eql([0, .5, 1]);
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});
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}
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it('throws when a threshold is not a number', function() {
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expect(function() {
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io = new IntersectionObserver(noop, {threshold: ['foo']});
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}).to.throwException();
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});
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it('throws when a threshold value is not between 0 and 1', function() {
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expect(function() {
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io = new IntersectionObserver(noop, {threshold: [0, -1]});
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}).to.throwException();
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});
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});
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describe('observe', function() {
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it('throws when target is not an Element', function() {
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expect(function() {
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io = new IntersectionObserver(noop);
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io.observe(null);
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}).to.throwException();
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});
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it('triggers for all targets when observing begins', function(done) {
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io = new IntersectionObserver(function(records) {
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expect(records.length).to.be(2);
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expect(records[0].intersectionRatio).to.be(1);
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expect(records[1].intersectionRatio).to.be(0);
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done();
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}, {root: rootEl});
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targetEl2.style.top = '-40px';
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io.observe(targetEl1);
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io.observe(targetEl2);
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});
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it('triggers for existing targets when observing begins after monitoring has begun', function(done) {
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var spy = sinon.spy();
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io = new IntersectionObserver(spy, {root: rootEl});
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io.observe(targetEl1);
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setTimeout(function() {
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io.observe(targetEl2);
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setTimeout(function() {
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expect(spy.callCount).to.be(2);
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done();
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}, ASYNC_TIMEOUT);
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}, ASYNC_TIMEOUT);
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});
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it('triggers with the correct arguments', function(done) {
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io = new IntersectionObserver(function(records, observer) {
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expect(records.length).to.be(2);
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expect(records[0] instanceof IntersectionObserverEntry).to.be.ok();
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expect(records[1] instanceof IntersectionObserverEntry).to.be.ok();
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expect(observer).to.be(io);
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expect(this).to.be(io);
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done();
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}, {root: rootEl});
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targetEl2.style.top = '-40px';
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io.observe(targetEl1);
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io.observe(targetEl2);
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});
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it('handles container elements with non-visible overflow',
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function(done) {
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var spy = sinon.spy();
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io = new IntersectionObserver(spy, {root: rootEl});
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runSequence([
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function(done) {
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io.observe(targetEl1);
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setTimeout(function() {
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expect(spy.callCount).to.be(1);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(1);
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expect(records[0].intersectionRatio).to.be(1);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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targetEl1.style.left = '-40px';
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setTimeout(function() {
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expect(spy.callCount).to.be(2);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(1);
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expect(records[0].intersectionRatio).to.be(0);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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parentEl.style.overflow = 'visible';
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setTimeout(function() {
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expect(spy.callCount).to.be(3);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(1);
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expect(records[0].intersectionRatio).to.be(1);
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done();
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}, ASYNC_TIMEOUT);
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}
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], done);
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});
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it('observes one target at a single threshold correctly', function(done) {
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var spy = sinon.spy();
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io = new IntersectionObserver(spy, {root: rootEl, threshold: 0.5});
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runSequence([
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function(done) {
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targetEl1.style.left = '-5px';
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io.observe(targetEl1);
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setTimeout(function() {
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expect(spy.callCount).to.be(1);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(1);
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expect(records[0].intersectionRatio).to.be.greaterThan(0.5);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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targetEl1.style.left = '-15px';
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setTimeout(function() {
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expect(spy.callCount).to.be(2);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(1);
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expect(records[0].intersectionRatio).to.be.lessThan(0.5);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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targetEl1.style.left = '-25px';
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setTimeout(function() {
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expect(spy.callCount).to.be(2);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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targetEl1.style.left = '-10px';
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setTimeout(function() {
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expect(spy.callCount).to.be(3);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(1);
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expect(records[0].intersectionRatio).to.be(0.5);
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done();
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}, ASYNC_TIMEOUT);
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}
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], done);
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});
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it('observes multiple targets at multiple thresholds correctly',
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function(done) {
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var spy = sinon.spy();
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io = new IntersectionObserver(spy, {
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root: rootEl,
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threshold: [1, 0.5, 0]
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});
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runSequence([
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function(done) {
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targetEl1.style.top = '0px';
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targetEl1.style.left = '-15px';
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targetEl2.style.top = '-5px';
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targetEl2.style.left = '0px';
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targetEl3.style.top = '0px';
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targetEl3.style.left = '205px';
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io.observe(targetEl1);
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io.observe(targetEl2);
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io.observe(targetEl3);
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setTimeout(function() {
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expect(spy.callCount).to.be(1);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(3);
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expect(records[0].target).to.be(targetEl1);
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expect(records[0].intersectionRatio).to.be(0.25);
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expect(records[1].target).to.be(targetEl2);
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expect(records[1].intersectionRatio).to.be(0.75);
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expect(records[2].target).to.be(targetEl3);
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expect(records[2].intersectionRatio).to.be(0);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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targetEl1.style.top = '0px';
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targetEl1.style.left = '-5px';
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targetEl2.style.top = '-15px';
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targetEl2.style.left = '0px';
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targetEl3.style.top = '0px';
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targetEl3.style.left = '195px';
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setTimeout(function() {
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expect(spy.callCount).to.be(2);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(3);
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expect(records[0].target).to.be(targetEl1);
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expect(records[0].intersectionRatio).to.be(0.75);
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expect(records[1].target).to.be(targetEl2);
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expect(records[1].intersectionRatio).to.be(0.25);
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expect(records[2].target).to.be(targetEl3);
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expect(records[2].intersectionRatio).to.be(0.25);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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targetEl1.style.top = '0px';
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targetEl1.style.left = '5px';
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targetEl2.style.top = '-25px';
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targetEl2.style.left = '0px';
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targetEl3.style.top = '0px';
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targetEl3.style.left = '185px';
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setTimeout(function() {
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expect(spy.callCount).to.be(3);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(3);
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expect(records[0].target).to.be(targetEl1);
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expect(records[0].intersectionRatio).to.be(1);
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expect(records[1].target).to.be(targetEl2);
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expect(records[1].intersectionRatio).to.be(0);
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expect(records[2].target).to.be(targetEl3);
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expect(records[2].intersectionRatio).to.be(0.75);
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done();
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}, ASYNC_TIMEOUT);
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},
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function(done) {
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targetEl1.style.top = '0px';
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targetEl1.style.left = '15px';
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targetEl2.style.top = '-35px';
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targetEl2.style.left = '0px';
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targetEl3.style.top = '0px';
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targetEl3.style.left = '175px';
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setTimeout(function() {
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expect(spy.callCount).to.be(4);
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var records = sortRecords(spy.lastCall.args[0]);
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expect(records.length).to.be(1);
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expect(records[0].target).to.be(targetEl3);
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expect(records[0].intersectionRatio).to.be(1);
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done();
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}, ASYNC_TIMEOUT);
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}
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], done);
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});
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it('handles rootMargin properly', function(done) {
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parentEl.style.overflow = 'visible';
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targetEl1.style.top = '0px';
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targetEl1.style.left = '-20px';
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targetEl2.style.top = '-20px';
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targetEl2.style.left = '0px';
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targetEl3.style.top = '0px';
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targetEl3.style.left = '200px';
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targetEl4.style.top = '180px';
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targetEl4.style.left = '180px';
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runSequence([
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function(done) {
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io = new IntersectionObserver(function(records) {
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records = sortRecords(records);
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expect(records.length).to.be(4);
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expect(records[0].target).to.be(targetEl1);
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expect(records[0].intersectionRatio).to.be(1);
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expect(records[1].target).to.be(targetEl2);
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expect(records[1].intersectionRatio).to.be(.5);
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expect(records[2].target).to.be(targetEl3);
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expect(records[2].intersectionRatio).to.be(.5);
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expect(records[3].target).to.be(targetEl4);
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expect(records[3].intersectionRatio).to.be(1);
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io.disconnect();
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done();
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}, {root: rootEl, rootMargin: '10px'});
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io.observe(targetEl1);
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io.observe(targetEl2);
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io.observe(targetEl3);
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io.observe(targetEl4);
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},
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function(done) {
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io = new IntersectionObserver(function(records) {
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records = sortRecords(records);
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expect(records.length).to.be(4);
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expect(records[0].target).to.be(targetEl1);
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expect(records[0].intersectionRatio).to.be(0.5);
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expect(records[1].target).to.be(targetEl2);
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expect(records[1].intersectionRatio).to.be(0);
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expect(records[2].target).to.be(targetEl3);
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expect(records[2].intersectionRatio).to.be(0.5);
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expect(records[3].target).to.be(targetEl4);
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expect(records[3].intersectionRatio).to.be(0.5);
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io.disconnect();
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done();
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}, {root: rootEl, rootMargin: '-10px 10%'});
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io.observe(targetEl1);
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io.observe(targetEl2);
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io.observe(targetEl3);
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io.observe(targetEl4);
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},
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function(done) {
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io = new IntersectionObserver(function(records) {
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records = sortRecords(records);
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expect(records.length).to.be(4);
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expect(records[0].target).to.be(targetEl1);
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expect(records[0].intersectionRatio).to.be(0.5);
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expect(records[1].target).to.be(targetEl2);
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expect(records[1].intersectionRatio).to.be(0);
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expect(records[2].target).to.be(targetEl3);
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expect(records[2].intersectionRatio).to.be(0);
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expect(records[3].target).to.be(targetEl4);
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expect(records[3].intersectionRatio).to.be(0.5);
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io.disconnect();
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done();
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}, {root: rootEl, rootMargin: '-5% -2.5% 0px'});
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io.observe(targetEl1);
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io.observe(targetEl2);
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io.observe(targetEl3);
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io.observe(targetEl4);
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},
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function(done) {
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io = new IntersectionObserver(function(records) {
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records = sortRecords(records);
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expect(records.length).to.be(4);
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expect(records[0].target).to.be(targetEl1);
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expect(records[0].intersectionRatio).to.be(0.5);
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expect(records[1].target).to.be(targetEl2);
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expect(records[1].intersectionRatio).to.be(0.5);
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expect(records[2].target).to.be(targetEl3);
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expect(records[2].intersectionRatio).to.be(0);
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expect(records[3].target).to.be(targetEl4);
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expect(records[3].intersectionRatio).to.be(0.25);
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io.disconnect();
|
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done();
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}, {root: rootEl, rootMargin: '5% -2.5% -10px -190px'});
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|
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io.observe(targetEl1);
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io.observe(targetEl2);
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io.observe(targetEl3);
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io.observe(targetEl4);
|
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}
|
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], done);
|
|
});
|
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|
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|
|
it('handles targets on the boundary of root', function(done) {
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|
|
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 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);
|
|
|
|
});
|
|
|
|
});
|
|
|
|
});
|
|
|
|
|
|
/**
|
|
* 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.
|
|
* @return {boolean} True if native support is detected.
|
|
*/
|
|
function supportsNativeIntersectionObserver() {
|
|
return 'IntersectionObserver' in window &&
|
|
window.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;
|
|
}
|
|
|