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Issue 2645283008: IntersectionObserver: Always send an initial notification. (Closed)
Patch Set: Fix unit test Created 3 years, 10 months ago
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1 <!DOCTYPE html> 1 <!DOCTYPE html>
2 <script src="../resources/testharness.js"></script> 2 <script src="../resources/testharness.js"></script>
3 <script src="../resources/testharnessreport.js"></script> 3 <script src="../resources/testharnessreport.js"></script>
4 <script src="./resources/intersection-observer-test-utils.js"></script> 4 <script src="./resources/intersection-observer-test-utils.js"></script>
5 5
6 <style> 6 <style>
7 pre, #log { 7 pre, #log {
8 position: absolute; 8 position: absolute;
9 top: 0; 9 top: 0;
10 left: 200px; 10 left: 200px;
(...skipping 20 matching lines...) Expand all
31 assert_equals(window.innerWidth, 800, "Window must be 800 pixels wide."); 31 assert_equals(window.innerWidth, 800, "Window must be 800 pixels wide.");
32 assert_equals(window.innerHeight, 600, "Window must be 600 pixels high."); 32 assert_equals(window.innerHeight, 600, "Window must be 600 pixels high.");
33 33
34 target = document.getElementById("target"); 34 target = document.getElementById("target");
35 var observer = new IntersectionObserver(function(changes) { 35 var observer = new IntersectionObserver(function(changes) {
36 entries = entries.concat(changes) 36 entries = entries.concat(changes)
37 }, { threshold: [0, 0.25, 0.5, 0.75, 1] }); 37 }, { threshold: [0, 0.25, 0.5, 0.75, 1] });
38 observer.observe(target); 38 observer.observe(target);
39 entries = entries.concat(observer.takeRecords()); 39 entries = entries.concat(observer.takeRecords());
40 assert_equals(entries.length, 0, "No initial notifications."); 40 assert_equals(entries.length, 0, "No initial notifications.");
41 runTestCycle(step0, "No notifications after first rAF."); 41 runTestCycle(step0, "First rAF.");
42 }, "Observer with multiple thresholds."); 42 }, "Observer with multiple thresholds.");
43 43
44 function step0() { 44 function step0() {
45 document.scrollingElement.scrollTop = 120; 45 document.scrollingElement.scrollTop = 120;
46 runTestCycle(step1, "document.scrollingElement.scrollTop = 120"); 46 runTestCycle(step1, "document.scrollingElement.scrollTop = 120");
47 assert_equals(entries.length, 0, "No notifications after first rAF."); 47 checkLastEntry(entries, 0, [8, 108, 708, 808, 0, 0, 0, 0, 0, 785, 0, 600, targ et]);
48 } 48 }
49 49
50 function step1() { 50 function step1() {
51 document.scrollingElement.scrollTop = 160; 51 document.scrollingElement.scrollTop = 160;
52 runTestCycle(step2, "document.scrollingElement.scrollTop = 160"); 52 runTestCycle(step2, "document.scrollingElement.scrollTop = 160");
53 checkLastEntry(entries, 0, [8, 108, 588, 688, 8, 108, 588, 600, 0, 785, 0, 600 , target]); 53 checkLastEntry(entries, 1, [8, 108, 588, 688, 8, 108, 588, 600, 0, 785, 0, 600 , target]);
54 } 54 }
55 55
56 function step2() { 56 function step2() {
57 document.scrollingElement.scrollTop = 200; 57 document.scrollingElement.scrollTop = 200;
58 runTestCycle(step3, "document.scrollingElement.scrollTop = 200"); 58 runTestCycle(step3, "document.scrollingElement.scrollTop = 200");
59 checkLastEntry(entries, 1, [8, 108, 548, 648, 8, 108, 548, 600, 0, 785, 0, 600 , target]); 59 checkLastEntry(entries, 2, [8, 108, 548, 648, 8, 108, 548, 600, 0, 785, 0, 600 , target]);
60 } 60 }
61 61
62 function step3() { 62 function step3() {
63 document.scrollingElement.scrollTop = 240; 63 document.scrollingElement.scrollTop = 240;
64 runTestCycle(step4, "document.scrollingElement.scrollTop = 240"); 64 runTestCycle(step4, "document.scrollingElement.scrollTop = 240");
65 checkLastEntry(entries, 2, [8, 108, 508, 608, 8, 108, 508, 600, 0, 785, 0, 600 , target]); 65 checkLastEntry(entries, 3, [8, 108, 508, 608, 8, 108, 508, 600, 0, 785, 0, 600 , target]);
66 } 66 }
67 67
68 function step4() { 68 function step4() {
69 document.scrollingElement.scrollTop = 740; 69 document.scrollingElement.scrollTop = 740;
70 runTestCycle(step5, "document.scrollingElement.scrollTop = 740"); 70 runTestCycle(step5, "document.scrollingElement.scrollTop = 740");
71 checkLastEntry(entries, 3, [8, 108, 468, 568, 8, 108, 468, 568, 0, 785, 0, 600 , target]); 71 checkLastEntry(entries, 4, [8, 108, 468, 568, 8, 108, 468, 568, 0, 785, 0, 600 , target]);
72 } 72 }
73 73
74 function step5() { 74 function step5() {
75 document.scrollingElement.scrollTop = 760; 75 document.scrollingElement.scrollTop = 760;
76 runTestCycle(step6, "document.scrollingElement.scrollTop = 760"); 76 runTestCycle(step6, "document.scrollingElement.scrollTop = 760");
77 checkLastEntry(entries, 4, [8, 108, -32, 68, 8, 108, 0, 68, 0, 785, 0, 600, ta rget]); 77 checkLastEntry(entries, 5, [8, 108, -32, 68, 8, 108, 0, 68, 0, 785, 0, 600, ta rget]);
78 } 78 }
79 79
80 function step6() { 80 function step6() {
81 document.scrollingElement.scrollTop = 800; 81 document.scrollingElement.scrollTop = 800;
82 runTestCycle(step7, "document.scrollingElement.scrollTop = 800"); 82 runTestCycle(step7, "document.scrollingElement.scrollTop = 800");
83 checkLastEntry(entries, 5, [8, 108, -52, 48, 8, 108, 0, 48, 0, 785, 0, 600, ta rget]); 83 checkLastEntry(entries, 6, [8, 108, -52, 48, 8, 108, 0, 48, 0, 785, 0, 600, ta rget]);
84 } 84 }
85 85
86 function step7() { 86 function step7() {
87 checkLastEntry(entries, 6, [8, 108, -92, 8, 8, 108, 0, 8, 0, 785, 0, 600, targ et]); 87 checkLastEntry(entries, 7, [8, 108, -92, 8, 8, 108, 0, 8, 0, 785, 0, 600, targ et]);
88 document.scrollingElement.scrollTop = 820; 88 document.scrollingElement.scrollTop = 820;
89 runTestCycle(step8, "document.scrollingElement.scrollTop = 820"); 89 runTestCycle(step8, "document.scrollingElement.scrollTop = 820");
90 } 90 }
91 91
92 function step8() { 92 function step8() {
93 checkLastEntry(entries, 7, [8, 108, -112, -12, 0, 0, 0, 0, 0, 785, 0, 600, tar get]); 93 checkLastEntry(entries, 8, [8, 108, -112, -12, 0, 0, 0, 0, 0, 785, 0, 600, tar get]);
94 document.scrollingElement.scrollTop = 0; 94 document.scrollingElement.scrollTop = 0;
95 } 95 }
96 </script> 96 </script>
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