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