| Xiaoming Shi | 73dfa20 | 2020-03-12 11:31:35 -0700 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <meta name="viewport" content="width=device-width,initial-scale=1"> |
| 3 | <script src="/resources/testharness.js"></script> |
| 4 | <script src="/resources/testharnessreport.js"></script> |
| 5 | <script src="./resources/intersection-observer-test-utils.js"></script> |
| 6 | |
| 7 | <style> |
| 8 | pre, #log { |
| 9 | position: absolute; |
| 10 | top: 0; |
| 11 | left: 200px; |
| 12 | } |
| 13 | .spacer { |
| 14 | height: calc(100vh + 100px); |
| 15 | } |
| 16 | #root { |
| 17 | display: inline-block; |
| 18 | overflow-y: scroll; |
| 19 | height: 240px; |
| 20 | border: 3px solid black; |
| 21 | } |
| 22 | #target { |
| 23 | width: 100px; |
| 24 | height: 100px; |
| 25 | margin: 200px 0 0 0; |
| 26 | background-color: green; |
| 27 | } |
| 28 | </style> |
| 29 | |
| 30 | <div id="root"> |
| 31 | <div id="target"></div> |
| 32 | </div> |
| 33 | |
| 34 | <script> |
| 35 | var entries = []; |
| 36 | var root, target; |
| 37 | |
| 38 | runTestCycle(function() { |
| 39 | target = document.getElementById("target"); |
| 40 | assert_true(!!target, "target exists"); |
| 41 | root = document.getElementById("root"); |
| 42 | assert_true(!!root, "root exists"); |
| 43 | var observer = new IntersectionObserver(function(changes) { |
| 44 | entries = entries.concat(changes) |
| 45 | }, { root: root, threshold: [0.5] }); |
| 46 | observer.observe(target); |
| 47 | entries = entries.concat(observer.takeRecords()); |
| 48 | assert_equals(entries.length, 0, "No initial notifications."); |
| 49 | runTestCycle(step0, "First rAF"); |
| 50 | }, "First observation with a threshold."); |
| 51 | |
| 52 | function step0() { |
| 53 | root.scrollTop = 20; |
| 54 | runTestCycle(step1, "root.scrollTop = 20"); |
| 55 | checkLastEntry(entries, 0, [ 11, 111, 211, 311, 11, 111, 211, 251, 11, 111, 11, 251, false]); |
| 56 | } |
| 57 | |
| 58 | function step1() { |
| 59 | checkLastEntry(entries, 1, [ 11, 111, 191, 291, 11, 111, 191, 251, 11, 111, 11, 251, true]); |
| 60 | } |
| 61 | </script> |
