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| <h1 class="page_title">Events</h1> |
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| <li> |
| <a href="#event-anchor">eventName</a> |
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| <!-- STATIC CONTENT PLACEHOLDER --> |
| <div id="static"><p> |
| An <code>Event</code> is an object |
| that allows you to be notified |
| when something interesting happens. |
| Here's an example of using the |
| <code>chrome.tabs.onCreated</code> event |
| to be notified whenever there's a new tab: |
| </p> |
| |
| <pre>chrome.tabs.onCreated.<b>addListener(function(</b>tab<b>) {</b> |
| appendToLog('tabs.onCreated --' |
| + ' window: ' + tab.windowId |
| + ' tab: ' + tab.id |
| + ' index: ' + tab.index |
| + ' url: ' + tab.url); |
| <b>});</b> |
| </pre> |
| |
| <p> |
| As the example shows, |
| you register for notification using <code>addListener()</code>. |
| The argument to <code>addListener()</code> |
| is always a function that you define to handle the event, |
| but the parameters to the function depend on |
| which event you're handling. |
| Checking the documentation for |
| <a href="tabs.html#event-onCreated"><code>chrome.tabs.onCreated</code></a>, |
| you can see that the function has a single parameter: |
| a <a href="tabs.html#type-Tab">Tab</a> object |
| that has details about the newly created tab. |
| </p> |
| |
| <h2> |
| Methods |
| </h2> |
| |
| <p> |
| You can invoke the following methods on any <code>Event</code> object: |
| </p> |
| |
| <pre>void addListener(function callback(...)) |
| void removeListener(function callback(...)) |
| bool hasListener(function callback(...)) |
| </pre> |
| |
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| <div class="summary"><span>void</span> |
| <!-- Note: intentionally longer 80 columns --> |
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| <var><span></span></var></span>)</div> |
| |
| <div class="description"> |
| <p class="todo">Undocumented.</p> |
| <p> |
| A description from the json schema def of the function goes here. |
| </p> |
| |
| <!-- PARAMETERS --> |
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| <dl> |
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| <div> |
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| |
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| <p> |
| If you specify the <em>callback</em> parameter, it should |
| specify a function that looks like this: |
| </p> |
| |
| <!-- Note: intentionally longer 80 columns --> |
| <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> |
| <dl> |
| <div> |
| <div> |
| </div> |
| </div> |
| </dl> |
| </div> |
| </div> |
| |
| <!-- MIN_VERSION --> |
| <p> |
| This function was added in version <b><span></span></b>. |
| If you require this function, the manifest key |
| <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> |
| can ensure that your extension won't be run in an earlier browser version. |
| </p> |
| </div> <!-- /description --> |
| |
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| |
| </div> <!-- /apiGroup --> |
| |
| <!-- EVENTS --> |
| <div id="eventsTemplate" class="apiGroup"> |
| <a></a> |
| <h3>Events</h3> |
| <!-- iterates over all events --> |
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| <a></a> |
| <h4>event name</h4> |
| |
| <div class="summary"> |
| <!-- Note: intentionally longer 80 columns --> |
| <span class="subdued">chrome.bookmarks</span><span>onEvent</span><span class="subdued">.addListener</span>(function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>); |
| </div> |
| |
| <div class="description"> |
| <p class="todo">Undocumented.</p> |
| <p> |
| A description from the json schema def of the event goes here. |
| </p> |
| |
| <!-- PARAMETERS --> |
| <div> |
| <h4>Parameters</h4> |
| <dl> |
| <div> |
| <div> |
| </div> |
| </div> |
| </dl> |
| </div> |
| </div> <!-- /decription --> |
| |
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| |
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