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WebAPI/AlarmAPI: Difference between revisions
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→FAQ: Descirve how to set the messages property for app before using mozSetMessageHandler.
(Add moz prefix for the usages of system messages APIs.) |
(→FAQ: Descirve how to set the messages property for app before using mozSetMessageHandler.) |
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== FAQ == | == FAQ == | ||
* Why the callback function set by <code>navigator.mozSetMessageHandler("alarm", function (message) { ... })</code> doesn't run when an alarm goes off? | |||
** You have to add a <code>messages</code> property in the application's manifest. The <code>messages</code> property is used to register the application as a potential target for catching certain types of messages, while <code>mozSetMessageHandler(...)</code> actually sets up the callback function that receives them. If you just call <code>mozSetMessageHandler(...)</code> without registering these messages before, you won't get them when an alarm goes off. For example, you have to add a <code>messages</code> property for registering the <code>"alarm"</code> message like below: | |||
"messages": ["alarm"] | |||
* Why? | * Why? | ||