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How to use chrome.alarms for Google Chrome extension

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长情又很酷
长情又很酷 2020-12-13 16:10

manifest.json

{
    \"manifest_version\": 2,
    \"name\": \"App name\",
    \"description\": \"Description goes here\",
    \"version\": \"
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2条回答
  • 野的像风
    2020-12-13 16:56

    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.

    manifest.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

    <!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

    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

    chrome.alarms.onAlarm.addListener(function(alarm) {
  alert("Beep");
});
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  • 别那么骄傲
    2020-12-13 17:09

    You didn't create any alarm, so no onAlarm event will be fired.

    Create an alarm with chrome.alarms.create. Note: you should do it in the chrome.runtime.onInstalled event.

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