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| 1 <div id="pageData-name" class="pageData">Event Pages</div> | 1 <h1>Event Pages</h1> |
| 2 <div id="pageData-showTOC" class="pageData">true</div> | 2 |
| 3 | 3 |
| 4 <p> | 4 <p> |
| 5 Event pages are very similar to | 5 Event pages are very similar to |
| 6 <a href="background_pages.html">background pages</a>, | 6 <a href="background_pages.html">background pages</a>, |
| 7 with one important difference: | 7 with one important difference: |
| 8 event pages are loaded only when they are needed. | 8 event pages are loaded only when they are needed. |
| 9 When the event page is not actively doing something, | 9 When the event page is not actively doing something, |
| 10 it is unloaded, freeing memory and other system resources. | 10 it is unloaded, freeing memory and other system resources. |
| 11 </p> | 11 </p> |
| 12 | 12 |
| (...skipping 100 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 113 <code><a href="extension.html#method-getBackgroundPage">chrome.extension.getBa
ckgroundPage()</a></code>, | 113 <code><a href="extension.html#method-getBackgroundPage">chrome.extension.getBa
ckgroundPage()</a></code>, |
| 114 switch to | 114 switch to |
| 115 <code><a href="runtime.html#method-getBackgroundPage">chrome.runtime.getBackgr
oundPage()</a></code> | 115 <code><a href="runtime.html#method-getBackgroundPage">chrome.runtime.getBackgr
oundPage()</a></code> |
| 116 instead. The newer method is asynchronous so that it can start the event | 116 instead. The newer method is asynchronous so that it can start the event |
| 117 page if necessary before returning it. | 117 page if necessary before returning it. |
| 118 | 118 |
| 119 <li>If you're using <a href="messaging.html">message passing</a>, be sure | 119 <li>If you're using <a href="messaging.html">message passing</a>, be sure |
| 120 to close unused message ports. The event page will not shut down until all | 120 to close unused message ports. The event page will not shut down until all |
| 121 message ports are closed. | 121 message ports are closed. |
| 122 </ol> | 122 </ol> |
| 123 </p> | 123 </p> |
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