зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
2.7 KiB
HTML
82 строки
2.7 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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.spacer {
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height: calc(100vh + 100px);
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}
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.target {
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width: 100px;
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height: 100px;
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margin: 10px;
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background-color: green;
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}
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</style>
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<div class="spacer"></div>
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<div id="target1" class="target"></div>
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<div id="target2" class="target"></div>
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<div id="target3" class="target"></div>
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<script>
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var entries = [];
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var target1, target2, target3;
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runTestCycle(function() {
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target1 = document.getElementById("target1");
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assert_true(!!target1, "target1 exists.");
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target2 = document.getElementById("target2");
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assert_true(!!target2, "target2 exists.");
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target3 = document.getElementById("target3");
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assert_true(!!target3, "target3 exists.");
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var observer = new IntersectionObserver(function(changes) {
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entries = entries.concat(changes)
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});
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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, "First rAF.");
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}, "One observer with multiple targets.");
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function step0() {
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document.scrollingElement.scrollTop = 150;
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runTestCycle(step1, "document.scrollingElement.scrollTop = 150");
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assert_equals(entries.length, 3, "Three initial notifications.");
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assert_equals(entries[0].target, target1, "entries[0].target === target1");
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assert_equals(entries[1].target, target2, "entries[1].target === target2");
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assert_equals(entries[2].target, target3, "entries[2].target === target3");
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}
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function step1() {
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document.scrollingElement.scrollTop = 10000;
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runTestCycle(step2, "document.scrollingElement.scrollTop = 10000");
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assert_equals(entries.length, 4, "Four notifications.");
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assert_equals(entries[3].target, target1, "entries[3].target === target1");
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}
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function step2() {
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document.scrollingElement.scrollTop = 0;
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runTestCycle(step3, "document.scrollingElement.scrollTop = 0");
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assert_equals(entries.length, 6, "Six notifications.");
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assert_equals(entries[4].target, target2, "entries[4].target === target2");
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assert_equals(entries[5].target, target3, "entries[5].target === target3");
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}
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function step3() {
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assert_equals(entries.length, 9, "Nine notifications.");
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assert_equals(entries[6].target, target1, "entries[6].target === target1");
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assert_equals(entries[7].target, target2, "entries[7].target === target2");
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assert_equals(entries[8].target, target3, "entries[8].target === target3");
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}
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</script>
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