[英]How to listen to custom events on all windows, bubbling issue?
我試圖監聽自定義事件'peakAhBoo',所以我將事件監聽器添加到gBrowser
,如果不存在gBrowser
,則將其添加到aDOMWindow
( gist )中。
程式碼片段:
loadIntoWindow: function (aDOMWindow, aXULWindow) {
if (!aDOMWindow) {
return;
}
if (aDOMWindow.gBrowser) {
aDOMWindow.gBrowser.addEventListener('peakAhBoo', respondToCustomEvent_peakAhBoo, true);
} else {
aDOMWindow.addEventListener('peakAhBoo', respondToCustomEvent_peakAhBoo, true);
}
},
調度事件的代碼:
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);
但是,如果我打開暫存器並從環境內容運行此create / dispatch事件代碼,則它不會冒泡到gBrowser
。 如果我在瀏覽器環境中運行它,它將永遠不會碰到窗口。
好的,現在我明白您的意思了,但是根據MDN,您需要使用以下代碼:
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
來源: https : //developer.mozilla.org/en-US/Add-ons/Code_snippets/Interaction_between_privileged_and_non-privileged_pages
我測試了它,而且有效!
網頁:
<!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>
並在特權代碼中:
function respondToCustomEvent_peakAhBoo(e){
console.log('g: '+e.target);
}
gBrowser.addEventListener("peakAhBoo", respondToCustomEvent_peakAhBoo, false, true);
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