Created
July 27, 2015 05:12
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| I have the script events_spy.js: | |
| (function(original) { | |
| Element.prototype.addEventListener = function(type, listener, | |
| useCapture) { | |
| if (typeof (this._handlerTypes) == 'undefined') { | |
| this._handlerTypes = {}; | |
| } | |
| this._handlerTypes[type] = true; | |
| return original.apply(this, arguments); | |
| } | |
| })(Element.prototype.addEventListener); | |
| // https://groups.google.com/a/chromium.org/forum/#!topic/chromium-extensions/HZ7j11UlPHk | |
| (function(original) { | |
| Element.prototype.removeEventListener = function(type, listener, | |
| useCapture) { | |
| if (typeof (this._handlerTypes) != 'undefined') { | |
| delete this._handlerTypes[type]; | |
| } | |
| return original.apply(this, arguments); | |
| } | |
| })(Element.prototype.removeEventListener); | |
| I declare this script in manifest.json as follows: | |
| "content_scripts" : [ | |
| { | |
| "matches" : [ "http://*/*", "https://*/*" ], | |
| "js" : [ "content/events_spy.js" ], | |
| "run_at" : "document_start", | |
| "all_frames" : true | |
| }, | |
| ... | |
| ] | |
| Then I test my extension on the following HTML page: | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| </head> | |
| <body> | |
| <a id="test" href="#">Click here</a> | |
| <script type="application/javascript"> | |
| document.getElementById("test").addEventListener("click", function() | |
| { alert("clicked"); }, false); | |
| </script> | |
| </body> | |
| </html> | |
| Unfortunately, this doesn't work - I can't see that debugger stops | |
| inside my custom addEventListener() function. What am I doing wrong? | |
| Thanks, | |
| Michael |
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