| <div id="scrolltarget"> |
| <script src="../../resources/js-test.js"></script> |
| <script> |
| description('This test checks that we correctly update the scroll event handler count as event handlers are added and removed'); |
| (function() { |
| // Test addEventListener/removeEventListener on the document. |
| var listener = function() { } |
| |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| document.addEventListener('scroll', listener, true); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| document.addEventListener('scroll', listener, false); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| document.removeEventListener('scroll', listener, true); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| |
| // Try removing the capturing listener again. |
| document.removeEventListener('scroll', listener, true); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| |
| document.removeEventListener('scroll', listener, false); |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| |
| debug('Test setting onscroll on the document.'); |
| (function() { |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| document.onscroll = function() { } |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| document.onscroll = function() { } |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| document.onscroll = null; |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| |
| debug('Test that nested Documents\' scroll handlers are properly tracked in their parent Document.'); |
| (function() { |
| var iframe = document.createElement('iframe'); |
| var scrolltarget = document.getElementById('scrolltarget'); |
| scrolltarget.onscroll = function() {}; |
| |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| |
| scrolltarget.appendChild(iframe); |
| |
| nestedDocument = iframe.contentWindow.document; |
| nestedDocument.open('text/html', 'replace'); |
| nestedDocument.write('<!DOCTYPE html>\n<script>\ndocument.onscroll=function(){};\n</' + 'script>\n'); |
| shouldBe('internals.scrollEventHandlerCount(nestedDocument)', '2'); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| |
| nestedDocument.write('<script>document.onscroll=undefined</' + 'script>\n'); |
| shouldBe('internals.scrollEventHandlerCount(nestedDocument)', '1'); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| |
| nestedDocument.close(); |
| |
| scrolltarget.removeChild(iframe); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| scrolltarget.onscroll = undefined; |
| })(); |
| |
| debug('Test that detaching a nested Document with handlers works properly.'); |
| (function() { |
| var iframe = document.createElement('iframe'); |
| var scrolltarget = document.getElementById('scrolltarget'); |
| |
| scrolltarget.appendChild(iframe); |
| |
| nestedDocument = iframe.contentWindow.document; |
| nestedDocument.open('text/html', 'replace'); |
| nestedDocument.write('<!DOCTYPE html>\n<script>\ndocument.onscroll=function(){};\n' + |
| 'window.onscroll=function(){};</' + 'script>\n'); |
| shouldBe('internals.scrollEventHandlerCount(nestedDocument)', '2'); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| |
| nestedDocument.close(); |
| scrolltarget.removeChild(iframe); |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| |
| debug('Test moving event listeners from an unattached document to an attached one'); |
| (function() { |
| doc = document.implementation.createHTMLDocument(''); |
| var div = doc.createElement('div'); |
| var childDiv = doc.createElement('div'); |
| |
| div.addEventListener('scroll', function() { }); |
| childDiv.addEventListener('scroll', function() { }); |
| div.appendChild(childDiv); |
| |
| // Since we only track event handlers on documents that attached to a page, |
| // |doc| should not have any registered handlers at this point. |
| shouldBe('internals.scrollEventHandlerCount(doc)', '0'); |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| |
| // Move the top level div into the current document. Both event handlers should |
| // get registered. |
| document.body.appendChild(div); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| |
| // Removing the div from the document does not affect the event handler count. |
| document.body.removeChild(div); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| |
| // Once the divs are destroyed the handlers go away. |
| div = null; |
| childDiv = null; |
| doc = null; |
| gc(); |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| |
| debug('Test moving event listeners from an attached document to an unattached one'); |
| (function() { |
| var div = document.createElement('div'); |
| div.addEventListener('scroll', function() { }); |
| document.body.appendChild(div); |
| |
| var iframe = document.createElement('iframe'); |
| div.appendChild(iframe); |
| var nestedDocument = iframe.contentWindow.document; |
| nestedDocument.open('text/html', 'replace'); |
| nestedDocument.write('<!DOCTYPE html>\n<script>\ndocument.onscroll=function(){};\n' + |
| 'window.onscroll=function(){};</' + 'script>\n'); |
| nestedDocument.close(); |
| |
| shouldBe('internals.scrollEventHandlerCount(document)', '3'); |
| |
| var unattachedDoc = document.implementation.createHTMLDocument(''); |
| unattachedDoc.body.appendChild(div); |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| |
| debug('Test moving a scroll event listener between documents belonging to the same page'); |
| (function() { |
| var iframe = document.createElement('iframe'); |
| document.body.appendChild(iframe); |
| var nestedDocument = iframe.contentWindow.document; |
| nestedDocument.open('text/html', 'replace'); |
| nestedDocument.write('<!DOCTYPE html><div id=foo></div>'); |
| nestedDocument.close(); |
| |
| var element = frames[0].document.getElementById('foo'); |
| var listener = function() { } |
| element.addEventListener('scroll', listener, false); |
| frames[0].window.addEventListener('scroll', listener, false); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| |
| document.body.appendChild(element); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| |
| element.removeEventListener('scroll', listener, false); |
| frames[0].window.removeEventListener('scroll', listener, false); |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| |
| debug('Test addEventListener/removeEventListener on the window.'); |
| (function() { |
| var listener = function() { } |
| |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| window.addEventListener('scroll', listener, true); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| window.addEventListener('scroll', listener, false); |
| shouldBe('internals.scrollEventHandlerCount(document)', '2'); |
| window.removeEventListener('scroll', listener, true); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| |
| // Try removing the capturing listener again. |
| window.removeEventListener('scroll', listener, true); |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| |
| window.removeEventListener('scroll', listener, false); |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| |
| debug('Test setting onscroll on the window.'); |
| (function() { |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| window.onscroll = function() { } |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| window.onscroll = function() { } |
| shouldBe('internals.scrollEventHandlerCount(document)', '1'); |
| window.onscroll = null; |
| shouldBe('internals.scrollEventHandlerCount(document)', '0'); |
| })(); |
| </script> |
| </body> |
