[英]How to listen to custom events on all windows, bubbling issue?
I'm trying to listen to custom event 'peakAhBoo' so I add the event listener to gBrowser
and if no gBrowser
is present then I add it to aDOMWindow
( gist ). 我试图监听自定义事件'peakAhBoo',所以我将事件监听器添加到
gBrowser
,如果不存在gBrowser
,则将其添加到aDOMWindow
( gist )中。
Code snippet: 程式码片段:
loadIntoWindow: function (aDOMWindow, aXULWindow) {
if (!aDOMWindow) {
return;
}
if (aDOMWindow.gBrowser) {
aDOMWindow.gBrowser.addEventListener('peakAhBoo', respondToCustomEvent_peakAhBoo, true);
} else {
aDOMWindow.addEventListener('peakAhBoo', respondToCustomEvent_peakAhBoo, true);
}
},
Code to dispatch event: 调度事件的代码:
var myEvent = new CustomEvent('peakAhBoo', {
'detail': {
'hazcheeseburger': true
}
});
var myEvent = window.document.createEvent('CustomEvent');
var myEventDetail = {hello:'world'};
myEvent.initCustomEvent('peakAhBoo', true, true, myEventDetail);
window.dispatchEvent(myEvent);
However if I open scratchpad and run this create/dispatch event code from environment content, its not bubbling up to gBrowser
. 但是,如果我打开暂存器并从环境内容运行此create / dispatch事件代码,则它不会冒泡到
gBrowser
。 If I run it in browser environment it never hits the window. 如果我在浏览器环境中运行它,它将永远不会碰到窗口。
ok, now i see what you mean, but according to MDN you need to use this: 好的,现在我明白您的意思了,但是根据MDN,您需要使用以下代码:
document.addEventListener("MyExtensionEvent", function(e) { myExtension.myListener(e); }, false, true);
// The last value is a Mozilla-specific value to indicate untrusted content is allowed to trigger the event
source: https://developer.mozilla.org/en-US/Add-ons/Code_snippets/Interaction_between_privileged_and_non-privileged_pages 来源: https : //developer.mozilla.org/en-US/Add-ons/Code_snippets/Interaction_between_privileged_and_non-privileged_pages
I tested it and it works! 我测试了它,而且有效!
web page: 网页:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="main-content"><button onclick="trigger()">Trigger custom event</button></div>
<script type="text/javascript">
function trigger(){
var myEvent = new CustomEvent('peakAhBoo', {
'detail': {
'hazcheeseburger': true
}
});
var myEvent = window.document.createEvent('CustomEvent');
var myEventDetail = {hello:'world'};
myEvent.initCustomEvent('peakAhBoo', true, true, myEventDetail);
window.dispatchEvent(myEvent);
console.log(myEvent)
}
</script>
</body>
</html>
and in privileged code: 并在特权代码中:
function respondToCustomEvent_peakAhBoo(e){
console.log('g: '+e.target);
}
gBrowser.addEventListener("peakAhBoo", respondToCustomEvent_peakAhBoo, false, true);
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