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→FAQ: correct messages property
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** 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 handles them. If you just call <code>mozSetMessageHandler(...)</code> without registering the <code>"alarm"</code> message previously, you won't receive it when an alarm goes off. Therefore, you have to add a <code>messages</code> property for registering the <code>"alarm"</code> message like below: | ** 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 handles them. If you just call <code>mozSetMessageHandler(...)</code> without registering the <code>"alarm"</code> message previously, you won't receive it when an alarm goes off. Therefore, you have to add a <code>messages</code> property for registering the <code>"alarm"</code> message like below: | ||
"messages": ["alarm"] | "messages": [ | ||
{ "alarm": "/index.html" } | |||
] | |||
* I've already added a <code>messages</code> property for registering the <code>"alarm"</code> message and set the system message handler for handling that. Why can't I receive that when the alarm goes off? | * I've already added a <code>messages</code> property for registering the <code>"alarm"</code> message and set the system message handler for handling that. Why can't I receive that when the alarm goes off? | ||