113 lines
3.8 KiB
HTML
113 lines
3.8 KiB
HTML
<!DOCTYPE html>
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="./resources/intersection-observer-test-utils.js"></script>
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<style>
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pre, #log {
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position: absolute;
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top: 0;
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left: 200px;
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}
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#root {
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position: absolute;
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top: 0;
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left: 0;
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width: 150px;
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height: 200px;
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overflow-y: scroll;
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}
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#target1, #target2, #target3, #target4 {
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width: 100px;
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height: 100px;
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}
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#target1 {
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background-color: green;
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}
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#target2 {
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background-color: red;
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}
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#target3 {
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background-color: blue;
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}
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#target4 {
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background-color: yellow;
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}
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</style>
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<div id="root">
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<div id="target1"></div>
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<div id="target2"></div>
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<div id="target3"></div>
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</div>
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<script>
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var entries = [];
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var observer;
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runTestCycle(function() {
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var root = document.getElementById('root');
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var target1 = document.getElementById('target1');
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var target2 = document.getElementById('target2');
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var target3 = document.getElementById('target3');
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assert_true(!!root, "root element exists.");
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assert_true(!!target1, "target1 element exists.");
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assert_true(!!target2, "target2 element exists.");
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assert_true(!!target3, "target3 element exists.");
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observer = new IntersectionObserver(function(changes) {
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entries = entries.concat(changes);
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}, { root: root });
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observer.observe(target1);
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observer.observe(target2);
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observer.observe(target3);
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entries = entries.concat(observer.takeRecords());
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assert_equals(entries.length, 0, "No initial notifications.");
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runTestCycle(step0, "Rects in initial notifications should report initial positions.");
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}, "isIntersecting changes should trigger notifications.");
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function step0() {
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assert_equals(entries.length, 3, "Has 3 initial notifications.");
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checkRect(entries[0].boundingClientRect, [0, 100, 0, 100], "Check 1st entry rect");
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assert_equals(entries[0].target.id, 'target1', "Check 1st entry target id.");
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checkIsIntersecting(entries, 0, true);
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checkRect(entries[1].boundingClientRect, [0, 100, 100, 200], "Check 2nd entry rect");
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assert_equals(entries[1].target.id, 'target2', "Check 2nd entry target id.");
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checkIsIntersecting(entries, 1, true);
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checkRect(entries[2].boundingClientRect, [0, 100, 200, 300], "Check 3rd entry rect");
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assert_equals(entries[2].target.id, 'target3', "Check 3rd entry target id.");
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checkIsIntersecting(entries, 2, true);
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runTestCycle(step1, "Set scrollTop=100 and check for no new notifications.");
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root.scrollTop = 100;
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}
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function step1() {
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assert_equals(entries.length, 3, "Has 3 total notifications because isIntersecting did not change.");
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runTestCycle(step2, "Add 4th target.");
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root.scrollTop = 0;
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var target4 = document.createElement('div');
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target4.setAttribute('id', 'target4');
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root.appendChild(target4);
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observer.observe(target4);
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}
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function step2() {
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assert_equals(entries.length, 4, "Has 4 total notifications because 4th element was added.");
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checkRect(entries[3].boundingClientRect, [0, 100, 300, 400], "Check 4th entry rect");
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assert_equals(entries[3].target.id, 'target4', "Check 4th entry target id.");
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checkIsIntersecting(entries, 3, false);
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assert_equals(entries[3].intersectionRatio, 0, 'target4 initially has intersectionRatio of 0.');
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runTestCycle(step3, "Set scrollTop=100 and check for one new notification.");
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root.scrollTop = 100;
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}
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function step3() {
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assert_equals(entries.length, 5, "Has 5 total notifications.");
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checkRect(entries[4].boundingClientRect, [0, 100, 200, 300], "Check 5th entry rect");
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assert_equals(entries[4].target.id, 'target4', "Check 5th entry target id.");
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checkIsIntersecting(entries, 4, true);
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assert_equals(entries[4].intersectionRatio, 0, 'target4 still has intersectionRatio of 0.');
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root.scrollTop = 0; // reset to make it easier to refresh and run the test
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}
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</script>
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