| <!DOCTYPE html> |
| <script src="../resources/js-test.js"></script> |
| <script src="helper-functions.js"></script> |
| <div style="width:100%; height:700px;"></div> |
| <div id="root" style="display: inline-block; overflow-y: scroll; height: 200px; border: 3px solid black"> |
| <div style="width:100px; height: 300px;"></div> |
| <div id="target" style="background-color: green; width:100px; height:100px"></div> |
| </div> |
| <div style="width:100%;height:700px;"></div> |
| |
| <script> |
| description("Simple intersection observer test with explicit root and target in the same document."); |
| var target = document.getElementById("target"); |
| var root = document.getElementById("root"); |
| var entries = []; |
| var observer = new IntersectionObserver( |
| changes => { entries = entries.concat(changes) }, |
| { root: document.getElementById("root") } |
| ); |
| |
| onload = function() { |
| observer.observe(target); |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 0); |
| requestAnimationFrame(() => { requestAnimationFrame(step0) }); |
| } |
| |
| // Test that notifications are not generated when the target is overflow clipped by the root. |
| function step0() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 0); |
| document.scrollingElement.scrollTop = 600; |
| requestAnimationFrame(step1); |
| } |
| |
| function step1() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 0); |
| root.scrollTop = 150; |
| requestAnimationFrame(step2); |
| } |
| |
| function step2() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 1); |
| if (entries.length > 0) { |
| shouldBeEqualToNumber("entries[0].boundingClientRect.left", 11); |
| shouldBeEqualToNumber("entries[0].boundingClientRect.right", 111); |
| shouldBeEqualToNumber("entries[0].boundingClientRect.top", 261); |
| shouldBeEqualToNumber("entries[0].boundingClientRect.bottom", 361); |
| shouldBeEqualToNumber("entries[0].intersectionRect.left", 11); |
| shouldBeEqualToNumber("entries[0].intersectionRect.right", 111); |
| shouldBeEqualToNumber("entries[0].intersectionRect.top", 261); |
| shouldBeEqualToNumber("entries[0].intersectionRect.bottom", 311); |
| shouldBeEqualToNumber("entries[0].rootBounds.left", 11); |
| shouldBeEqualToNumber("entries[0].rootBounds.right", 111); |
| shouldBeEqualToNumber("entries[0].rootBounds.top", 111); |
| shouldBeEqualToNumber("entries[0].rootBounds.bottom", 311); |
| shouldEvaluateToSameObject("entries[0].target", target); |
| } |
| document.scrollingElement.scrollTop = 0; |
| requestAnimationFrame(step3); |
| } |
| |
| function step3() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 1); |
| root.scrollTop = 0; |
| requestAnimationFrame(step4); |
| } |
| |
| function step4() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 2); |
| if (entries.length > 1) { |
| shouldBeEqualToNumber("entries[1].boundingClientRect.left", 11); |
| shouldBeEqualToNumber("entries[1].boundingClientRect.right", 111); |
| shouldBeEqualToNumber("entries[1].boundingClientRect.top", 1011); |
| shouldBeEqualToNumber("entries[1].boundingClientRect.bottom", 1111); |
| shouldBeEqualToNumber("entries[1].intersectionRect.left", 0); |
| shouldBeEqualToNumber("entries[1].intersectionRect.right", 0); |
| shouldBeEqualToNumber("entries[1].intersectionRect.top", 0); |
| shouldBeEqualToNumber("entries[1].intersectionRect.bottom", 0); |
| shouldBeEqualToNumber("entries[1].rootBounds.left", 11); |
| shouldBeEqualToNumber("entries[1].rootBounds.right", 111); |
| shouldBeEqualToNumber("entries[1].rootBounds.top", 711); |
| shouldBeEqualToNumber("entries[1].rootBounds.bottom", 911); |
| shouldEvaluateToSameObject("entries[1].target", target); |
| } |
| root.scrollTop = 150; |
| requestAnimationFrame(step5); |
| } |
| |
| // This tests that notifications are generated even when the root element is off screen. |
| function step5() { |
| entries = entries.concat(observer.takeRecords()); |
| shouldBeEqualToNumber("entries.length", 3); |
| if (entries.length > 2) { |
| shouldBeEqualToNumber("entries[2].boundingClientRect.left", 11); |
| shouldBeEqualToNumber("entries[2].boundingClientRect.right", 111); |
| shouldBeEqualToNumber("entries[2].boundingClientRect.top", 861); |
| shouldBeEqualToNumber("entries[2].boundingClientRect.bottom", 961); |
| shouldBeEqualToNumber("entries[2].intersectionRect.left", 11); |
| shouldBeEqualToNumber("entries[2].intersectionRect.right", 111); |
| shouldBeEqualToNumber("entries[2].intersectionRect.top", 861); |
| shouldBeEqualToNumber("entries[2].intersectionRect.bottom", 911); |
| shouldBeEqualToNumber("entries[2].rootBounds.left", 11); |
| shouldBeEqualToNumber("entries[2].rootBounds.right", 111); |
| shouldBeEqualToNumber("entries[2].rootBounds.top", 711); |
| shouldBeEqualToNumber("entries[2].rootBounds.bottom", 911); |
| shouldEvaluateToSameObject("entries[2].target", target); |
| } |
| finishJSTest(); |
| } |
| </script> |
