javascript 如何将 chrome.alarms 用于 Google Chrome 扩展程序
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How to use chrome.alarms for Google Chrome extension
提问by lomse
manifest.json
清单文件.json
{
"manifest_version": 2,
"name": "App name",
"description": "Description goes here",
"version": "1.0",
"background": {
"scripts": ["background.js"]
},
"permissions": [
"tabs",
"alarms"
],
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
}
}
I trying to create a function to make a popup "great" every minute like this:
我试图创建一个函数来让弹出窗口每分钟都“很棒”，如下所示：
chrome.alarms.onAlarm.addListener(function(){
alert('great');
});
Could someone please tell why is it not triggering that alert. I check the console, no error was displayed. Thanks.
有人可以告诉为什么它没有触发该警报。我检查了控制台，没有显示错误。谢谢。
回答by Salix alba
Here is the simplest working example I can think of, warning it is very annoying as when the alarm is on it alerts "Beep" every 12 seconds. It uses a popup browser action to switch the alarm on and off.
这是我能想到的最简单的工作示例，警告它非常烦人，因为当警报响起时，它每 12 秒就会发出“哔”声。它使用弹出式浏览器操作来打开和关闭警报。
manifest.json
清单文件.json
{
"manifest_version": 2,
"name": "Alarm test",
"description": "This extension alarms.",
"version": "1.0",
"permissions": [
"alarms"
],
"background": {
"scripts": ["eventPage.js"],
"persistent": false
},
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
}
}
popup.html
弹出窗口.html
<!doctype html>
<html>
<head>
<title>Alarms Popup</title>
<script src="popup.js"></script>
</head>
<body>
<a href="" id="alarmOn">ON</a>
<a href="" id="alarmOff">OFF</a>
</ul>
</body>
</html>
popup.js
弹出窗口.js
var alarmClock = {
onHandler : function(e) {
chrome.alarms.create("myAlarm", {delayInMinutes: 0.1, periodInMinutes: 0.2} );
window.close();
},
offHandler : function(e) {
chrome.alarms.clear("myAlarm");
window.close();
},
setup: function() {
var a = document.getElementById('alarmOn');
a.addEventListener('click', alarmClock.onHandler );
var a = document.getElementById('alarmOff');
a.addEventListener('click', alarmClock.offHandler );
}
};
document.addEventListener('DOMContentLoaded', function () {
alarmClock.setup();
});
And the important bit in eventPage.js
以及 eventPage.js 中的重要部分
chrome.alarms.onAlarm.addListener(function(alarm) {
alert("Beep");
});
回答by u1841048
You didn't create any alarm, so no onAlarmevent will be fired.
您没有创建任何警报，因此不会onAlarm触发任何事件。
Create an alarm with chrome.alarms.create. Note: you should do it in the chrome.runtime.onInstalledevent.
使用chrome.alarms.create创建闹钟。注意：您应该在chrome.runtime.onInstalled事件中执行此操作。
