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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link href="stable/static/css/site.css" rel="stylesheet" type="text/css">
<link href="stable/static/css/print.css" rel="stylesheet" type="text/css" media="print">
<link href="stable/static/css/prettify.css" rel="stylesheet" type="text/css">
<link href="//www.google.com/images/icons/product/chrome-16.png" rel="icon" type="image/ico">
<link href="stable/static/css/api.css" rel="stylesheet" type="text/css">
<title>chrome.pageAction - chrome插件中文开发文档(非官方)</title>
</head>
<body>
<a id="top"></a>
<div id="header">{Header content}</div>
<a id="gc-topnav-anchor"></a>
<div id="gc-topnav">
<h1>Google Chrome Extensions</h1>
<ul id="home" class="gc-topnav-tabs">
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<a href="http://stackoverflow.com/questions/tagged/google-chrome-extension" title="[google-chrome-extension] tag on Stack Overflow"><div>Questions?</div></a>
</li>
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class="level1 ">
<li class="level2">
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</li>
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<ul
class="level2 ">
<li class="level3">
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<span class="level3">Browser UI</span>
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</li>
<li class="level4">
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</li>
</ul>
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</li>
</ul>
</li>
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</div>
<div id="gc-pagecontent">
<h1 class="page_title">chrome.pageAction</h1>
<div id="toc">
<h2>Contents</h2>
<ol>
<li>
<a href=#manifest>Manifest</a>
</li>
<li>
<a href=#ui>Parts of the UI</a>
</li>
<li>
<a href=#tips>Tips</a>
</li>
<li>
<a href=#examples> Examples </a>
</li>
<li>
<a href="#apiReference">API reference: chrome.pageAction</a>
<ol>
<li><a href="#types">Types</a><ol> <li> <a href="#type-ImageDataType">ImageDataType</a> </li></ol></li>
<li><a href="#methods">Methods</a><ol> <li><a href="#method-show">show</a></li> <li><a href="#method-hide">hide</a></li> <li><a href="#method-setTitle">setTitle</a></li> <li><a href="#method-getTitle">getTitle</a></li> <li><a href="#method-setIcon">setIcon</a></li> <li><a href="#method-setPopup">setPopup</a></li> <li><a href="#method-getPopup">getPopup</a></li></ol></li>
<li><a href="#events">Events</a><ol> <li><a href="#event-onClicked">onClicked</a></li></ol></li>
<li><a href="#samples">Sample Extensions</a></li>
</ol>
</li>
</ol>
</div>
<p>
Use page actions to put icons inside the address bar.
Page actions represent actions
that can be taken on the current page,
but that aren't applicable to all pages.
Some examples:
</p>
<ul>
<li> Subscribe to this page's RSS feed </li>
<li> Make a slideshow out of this page's photos </li>
</ul>
<p>
The RSS icon in the following screenshot
represents a page action
that lets you subscribe to
the RSS feed for the current page.
</p>
<img src="stable/static/images/page-action.png"
width="361" height="79" />
<p>
If you want the extension's icon to always be visible,
use a <a href="browserAction.html">browser action</a> instead.
</p>
<h2 id="manifest">Manifest</h2>
<p>
Register your page action in the
<a href="manifest.html">extension manifest</a>
like this:
</p>
<pre>{
"name": "My extension",
...
<b>"page_action": {
"default_icon": { <em>// optional</em>
"19": "images/icon19.png", <em>// optional</em>
"38": "images/icon38.png" <em>// optional</em>
},
"default_title": "Google Mail", <em>// optional; shown in tooltip</em>
"default_popup": "popup.html" <em>// optional</em>
}</b>,
...
}</pre>
<p>
If you only provide one of the 19px or 38px icon size, the extension system will
scale the icon you provide to the pixel density of the user's display, which
can lose detail or make it look fuzzy. The old syntax for registering the
default icon is still supported:
</p>
<pre>{
"name": "My extension",
...
<b>"page_action": {
...
"default_icon": "images/icon19.png" <em>// optional</em>
<em>// equivalent to "default_icon": { "19": "images/icon19.png" }</em>
}</b>,
...
}</pre>
<h2 id="ui">Parts of the UI</h2>
<p>
Like browser actions,
page actions can have an icon,
a tooltip, and popup;
they can't have badges, however.
In addition, page actions can appear and disappear.
You can find information about icons, tooltips, and popups
by reading about the
<a href="browserAction.html#ui">browser action UI</a>.
</p>
<p>
You make a page action appear and disappear using the
<a href="#method-show">show()</a> and
<a href="#method-hide">hide()</a> methods, respectively.
By default, a page action is hidden.
When you show it, you specify the tab
in which the icon should appear.
The icon remains visible
until the tab is closed
or starts displaying a different URL
(because the user clicks a link, for example).
</p>
<h2 id="tips">Tips</h2>
<p>For the best visual impact,
follow these guidelines:</p>
<ul>
<li><b>Do</b> use page actions
for features that make sense
for only a few pages.
<li><b>Don't</b> use page actions
for features that make sense
for most pages.
Use <a href="browserAction.html">browser actions</a> instead.
<li><b>Don't</b> constantly animate your icon.
That's just annoying.
</ul>
<h2 id="examples"> Examples </h2>
<p>
You can find simple examples of using page actions in the
<a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/api/pageAction/">examples/api/pageAction</a>
directory.
For other examples and for help in viewing the source code, see
<a href="samples.html">Samples</a>.
</p>
<h2 id="apiReference">API Reference: chrome.pageAction</h2>
<div class="api_reference">
<h3 id="types">Types</h3>
<div>
<h3 id="type-ImageDataType">ImageDataType</h3>
<div>
<dt><span class="type_name"> ( <span id="typeTemplate">imagedata</span> )</span></dt>
<dd>
Pixel data for an image. Must be an ImageData object (for example, from a <code>canvas</code> element).
</dd> </div>
</div>
<h3 id="methods">Methods</h3>
<div>
<h4 id="method-show">show</h4>
<div class="summary lower">
<span>chrome.pageAction.show</span>(<span>integer <span class="variable">tabId</span></span>)
</div>
<div class="description">
<p>
Shows the page action. The page action is shown whenever the tab is selected.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-show-tabId"></a> <dt> <span class="variable">tabId</span> <span class="property"> ( <span id="typeTemplate">integer</span> ) </span> </dt> <dd> The id of the tab for which you want to modify the page action. </dd></div>
</dl>
</div>
</div>
<div>
<h4 id="method-hide">hide</h4>
<div class="summary lower">
<span>chrome.pageAction.hide</span>(<span>integer <span class="variable">tabId</span></span>)
</div>
<div class="description">
<p>
Hides the page action.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-hide-tabId"></a> <dt> <span class="variable">tabId</span> <span class="property"> ( <span id="typeTemplate">integer</span> ) </span> </dt> <dd> The id of the tab for which you want to modify the page action. </dd></div>
</dl>
</div>
</div>
<div>
<h4 id="method-setTitle">setTitle</h4>
<div class="summary lower">
<span>chrome.pageAction.setTitle</span>(<span>object <span class="variable">details</span></span>)
</div>
<div class="description">
<p>
Sets the title of the page action. This is displayed in a tooltip over the page action.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-setTitle-details"></a> <dt> <span class="variable">details</span> <span class="property"> ( <span id="typeTemplate">object</span> ) </span> </dt> <dd> <dl> <div> <a name="property-details-tabId"></a> <dt> <span class="variable">tabId</span> <span class="property"> ( <span id="typeTemplate">integer</span> ) </span> </dt> <dd> The id of the tab for which you want to modify the page action. </dd> </div> <div> <a name="property-details-title"></a> <dt> <span class="variable">title</span> <span class="property"> ( <span id="typeTemplate">string</span> ) </span> </dt> <dd> The tooltip string. </dd> </div> </dl> </dd></div>
</dl>
</div>
</div>
<div>
<h4 id="method-getTitle">getTitle</h4>
<div class="summary lower">
<span>chrome.pageAction.getTitle</span>(<span>object <span class="variable">details</span></span>)
</div>
<div class="description">
<p>
Gets the title of the browser action.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-getTitle-details"></a> <dt> <span class="variable">details</span> <span class="property"> ( <span id="typeTemplate">object</span> ) </span> </dt> <dd> <dl> <div> <a name="property-details-tabId"></a> <dt> <span class="variable">tabId</span> <span class="property"> ( <span id="typeTemplate">integer</span> ) </span> </dt> <dd> Specify the tab to get the title from. </dd> </div> </dl> </dd></div>
</dl>
<h4>Callback function</h4><p> The <em>callback</em> parameter should specify a function that looks like this:</p><pre>function(string result) <span class="subdued">{...}</span>;</pre><dl> <div> <a name="property-callback-result"></a> <dt> <span class="variable">result</span> <span class="property"> ( <span id="typeTemplate">string</span> ) </span> </dt></div></dl>
</div>
</div>
<div>
<h4 id="method-setIcon">setIcon</h4>
<div class="summary lower">
<span>chrome.pageAction.setIcon</span>(<span>object <span class="variable">details</span></span>)
</div>
<div class="description">
<p>
Sets the icon for the page action. The icon can be specified either as the path to an image file or as the pixel data from a canvas element, or as dictionary of either one of those. Either the <b>path</b> or the <b>imageData</b> property must be specified.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-setIcon-details"></a> <dt> <span class="variable">details</span> <span class="property"> ( <span id="typeTemplate">object</span> ) </span> </dt> <dd> <dl> <div> <a name="property-details-tabId"></a> <dt> <span class="variable">tabId</span> <span class="property"> ( <span id="typeTemplate">integer</span> ) </span> </dt> <dd> The id of the tab for which you want to modify the page action. </dd> </div> <div> <a name="property-details-imageData"></a> <dt> <span class="variable">imageData</span> <span class="property"> ( <span class="optional">optional</span> <span id="typeTemplate"><a href="pageAction.html#type-ImageDataType">ImageDataType</a> or object</span> ) </span> </dt> <dd> Either an ImageData object or a dictionary {size -> ImageData} representing icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported. At least one image must be specified. Note that 'details.imageData = foo' is equivalent to 'details.imageData = {'19': foo}' </dd> </div> <div> <a name="property-details-path"></a> <dt> <span class="variable">path</span> <span class="property"> ( <span class="optional">optional</span> <span id="typeTemplate">string or object</span> ) </span> </dt> <dd> Either a relative image path or a dictionary {size -> relative image path} pointing to icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported. At least one image must be specified. Note that 'details.path = foo' is equivalent to 'details.imageData = {'19': foo}' </dd> </div> <div> <a name="property-details-iconIndex"></a> <dt> <span class="variable">iconIndex</span> <span class="property"> ( <span class="optional">optional</span> <span id="typeTemplate">integer</span> ) </span> </dt> <dd> <b>Deprecated.</b> This argument is ignored. </dd> </div> </dl> </dd></div>
</dl>
<h4>Callback function</h4><p> If you specify the <em>callback</em> parameter, it should specify a function that looks like this:</p><pre>function() <span class="subdued">{...}</span>;</pre><dl> </dl>
</div>
</div>
<div>
<h4 id="method-setPopup">setPopup</h4>
<div class="summary lower">
<span>chrome.pageAction.setPopup</span>(<span>object <span class="variable">details</span></span>)
</div>
<div class="description">
<p>
Sets the html document to be opened as a popup when the user clicks on the page action's icon.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-setPopup-details"></a> <dt> <span class="variable">details</span> <span class="property"> ( <span id="typeTemplate">object</span> ) </span> </dt> <dd> <dl> <div> <a name="property-details-tabId"></a> <dt> <span class="variable">tabId</span> <span class="property"> ( <span id="typeTemplate">integer</span> ) </span> </dt> <dd> The id of the tab for which you want to modify the page action. </dd> </div> <div> <a name="property-details-popup"></a> <dt> <span class="variable">popup</span> <span class="property"> ( <span id="typeTemplate">string</span> ) </span> </dt> <dd> The html file to show in a popup. If set to the empty string (''), no popup is shown. </dd> </div> </dl> </dd></div>
</dl>
</div>
</div>
<div>
<h4 id="method-getPopup">getPopup</h4>
<div class="summary lower">
<span>chrome.pageAction.getPopup</span>(<span>object <span class="variable">details</span></span>)
</div>
<div class="description">
<p>
Gets the html document set as the popup for this browser action.
</p> <h4>Parameters</h4>
<dl>
<div> <a name="property-getPopup-details"></a> <dt> <span class="variable">details</span> <span class="property"> ( <span id="typeTemplate">object</span> ) </span> </dt> <dd> <dl> <div> <a name="property-details-tabId"></a> <dt> <span class="variable">tabId</span> <span class="property"> ( <span id="typeTemplate">integer</span> ) </span> </dt> <dd> Specify the tab to get the popup from. </dd> </div> </dl> </dd></div>
</dl>
<h4>Callback function</h4><p> The <em>callback</em> parameter should specify a function that looks like this:</p><pre>function(string result) <span class="subdued">{...}</span>;</pre><dl> <div> <a name="property-callback-result"></a> <dt> <span class="variable">result</span> <span class="property"> ( <span id="typeTemplate">string</span> ) </span> </dt></div></dl>
</div>
</div>
<h3 id="events">Events</h3>
<div>
<h4 id="event-onClicked">onClicked</h4>
<div class="summary">
<span class="subdued">chrome.pageAction.</span>onClicked<span class="subdued">.addListener</span>(function(<span><a href="tabs.html#type-Tab">tabs.Tab</a> <span class="variable">tab</span></span>)<span class="subdued"> {...}</span>);
</div>
<div class="description">
<p>
Fired when a page action icon is clicked. This event will not fire if the page action has a popup.
</p> <h4>Listener Parameters</h4>
<dl>
<div> <a name="property-onClicked-tab"></a> <dt> <span class="variable">tab</span> <span class="property"> ( <span id="typeTemplate"><a href="tabs.html#type-Tab">tabs.Tab</a></span> ) </span> </dt></div>
</dl>
</div>
</div>
</div>
<h2 id="samples">Sample Extensions that use chrome.pageAction</h2>
<li><strong><a href="samples.html#fad62e9f7f55a4c7a8add7662b166779">Page action by content</a></strong> –
Shows a page action for HTML pages containing the word 'sandwich'
</li>
<li><strong><a href="samples.html#0ebfdfeb5e765ff6e1e8cb0c882ae98d">Page action by URL</a></strong> –
Shows a page action for urls which have the letter 'g' in them.
</li>
<li><strong><a href="samples.html#4042eaccda909714a2b78cfe60d59b9f">Mappy</a></strong> –
Finds addresses in the web page you're on and pops up a map window.
</li>
</div>
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