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<!DOCTYPE html><!-- This page is a placeholder for generated extensions api doc. Note: 1) The <head> information in this page is significant, should be uniform across api docs and should be edited only with knowledge of the templating mechanism. 2) The <body> tag *must* retain id="body" 3) All <body>.innerHTML is genereated as an rendering step. If viewed in a browser, it will be re-generated from the template, json schema and authored overview content. 4) The <body>.innerHTML is also generated by an offline step so that this page may easily be indexed by search engines. TODO(rafaelw): Abstract this into a "pageshell" that becomes the single version of page template shell and the "instance" pages (bookmarks.html, etc...) can be generated with a build step. --><!-- <html> must retain id="template --><html xmlns="http://www.w3.org/1999/xhtml" jstcache="0"><!-- <head> data is significant and loads the needed libraries and styles --><head jstcache="0"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" jstcache="0"> <title jscontent="pageTitle" jstcache="1">[object HTMLDivElement]</title> <link href="css/ApiRefStyles.css" rel="stylesheet" type="text/css" jstcache="0"> <script type="text/javascript" src="../../../third_party/jstemplate/jstemplate_compiled.js" jstcache="0"> </script> <script type="text/javascript" src="js/api_page_generator.js" jstcache="0"></script> <script type="text/javascript" src="js/bootstrap.js" jstcache="0"></script> </head><!-- <body> content is completely generated. Do not edit, as it will be and rewritten. --><body jstcache="0"> <div id="container" jstcache="0"> <a name="top" jstcache="0"> </a> <!-- API HEADER --> <div id="pageHeader" jstcache="0"> <div id="searchbox" jstcache="0"> <form action="http://www.google.com/cse" id="cse-search-box" jstcache="0"> <div jstcache="0"> <input type="hidden" name="cx" value="002967670403910741006:61_cvzfqtno" jstcache="0"> <input type="hidden" name="ie" value="UTF-8" jstcache="0"> <input type="text" name="q" size="31" jstcache="0"> <input type="submit" name="sa" value="Search" jstcache="0"> </div> </form> <script type="text/javascript" src="http://www.google.com/jsapi" jstcache="0"></script> <script type="text/javascript" jstcache="0">google.load("elements", "1", {packages: "transliteration"});</script> <script type="text/javascript" src="http://www.google.com/coop/cse/t13n?form=cse-search-box&t13n_langs=en" jstcache="0"></script> <script type="text/javascript" src="http://www.google.com/coop/cse/brand?form=cse-search-box&lang=en" jstcache="0"></script> </div> <div id="pageTitle" jstcache="0"> <h1 jscontent="getPageTitle()" jstcache="2">Background Pages</h1> </div> </div> <!-- /pageHeader --> <div id="pageContent" jstcache="0"> <!-- SIDENAV --> <div id="leftNav" jstcache="0"> <ul jstcache="0"> <li jstcache="0"> <a href="index.html" jstcache="0">Home</a></li> <li jstcache="0"> <a href="getstarted.html" jstcache="0">Get Started</a></li> <li jstcache="0"> <a href="overview.html" jstcache="0">Overview</a></li> <li jstcache="0">Reference <ul jstcache="0"> <li jstcache="0"><a href="manifest.html" jstcache="0">Manifest</a></li> <li jstcache="0"><a href="toolstrip.html" jstcache="0">Toolstrips</a></li> <li jstcache="0"><a href="pageActions.html" jstcache="0">Page actions</a></li> <li jstcache="0"><a href="background_pages.html" jstcache="0">Background pages</a></li> <li jstcache="0"><a href="content_scripts.html" jstcache="0">Content scripts</a></li> <li jstcache="0"><a href="tabs.html" jstcache="0">Tabs</a></li> <li jstcache="0"><a href="windows.html" jstcache="0">Windows</a></li> <li jstcache="0"><a href="bookmarks.html" jstcache="0">Bookmarks</a></li> <li jstcache="0"><a href="extension.html" jstcache="0">Extension</a></li> <li jstcache="0"><a href="npapi.html" jstcache="0">NPAPI Plugins</a></li> <li jstcache="0"><a href="packaging.html" jstcache="0">Packaging</a></li> <li jstcache="0"><a href="autoupdate.html" jstcache="0">Autoupdate</a></li> </ul> </li> <li jstcache="0">Samples <ul jstcache="0"> <li jstcache="0">[sample 1]</li> <li jstcache="0">[sample 2]</li> </ul> </li> </ul> </div> <div id="mainColumn" jstcache="0"> <!-- TABLE OF CONTENTS --> <div id="toc" jsselect="apiDefinition" jstcache="3" style="display: none; "> <p jstcache="0">Contents</p> <ol jstcache="0"> <li jstcache="0"> <a href="#overview" jstcache="0">Description</a> <ol jstcache="0"> <li jstcache="0"><a href="#overview-properties" jstcache="0">Properties</a></li> <li jstcache="0"><a href="#overview-examples" jstcache="0">Examples</a></li> </ol> </li> <li jsdisplay="functions && functions.length > 0" jstcache="4"> <a href="#methods" jstcache="0">Methods</a> <ol jstcache="0"> <li jsselect="functions" jstcache="7"> <a jscontent="name" jsvalues=".href:'#method-' + name" href="#method-anchor" jstcache="24">methodName</a> </li> </ol> </li> <li jsdisplay="events && events.length > 0" jstcache="5"> <a href="#events" jstcache="0">Events</a> <ol jstcache="0"> <li jsselect="events" jstcache="8"> <a jscontent="name" jsvalues=".href:'#event-' + name" href="#event-anchor" jstcache="25">eventName</a> </li> </ol> </li> <li jsdisplay="types && types.length > 0" jstcache="6"> <a href="#types" jstcache="0">Types</a> <ol jstcache="0"> <li jsselect="types" jstcache="9"> <a jscontent="id" jsvalues=".href:'#type-' + id" href="#id-anchor" jstcache="26">id</a> </li> </ol> </li> </ol> [PENDING: links to all h2s and h3s should go here -- would it be possible to link to overview h3s, as well? if so, how should we create their anchor/id values?] </div> <!-- /TABLE OF CONTENTS --> <!-- STATIC CONTENT PLACEHOLDER --> <div id="static" jstcache="0"><div id="pageData-title" class="pageData" jstcache="0">Background Pages</div> <p jstcache="0">A common need for extensions is to have a single long-running script to manage some task or state. Toolstrips don't quite fit this need, because there can be multiple toolstrips active at any one time (one per browser window). Background pages to the rescue.</p> <p jstcache="0">The background page is similar to a toolstrip, in that it is an HTML page that runs in the extension process. The difference is that the background page exists for the lifetime of your extension, and there is only one instance of it active at a time.</p> <h3 jstcache="0">Status</h3> <p jstcache="0">Implemented.</p> <h3 jstcache="0">Details</h3> <p jstcache="0">Register your background page in the extension manifest, like this:</p> <pre jstcache="0">{ "name": "My First Extension", "version": "1.0", "description": "The first extension that I made.", "background_page": "background.html", "toolstrips": ["toolstrip.html"] }</pre> <p jstcache="0">Your toolstrip will likely contain only the necessary code to display the toolstrip UI, with all your extension logic contained in the background page. You can communicate between your various pages using direct script calls, similar to how frames can communicate. The chrome.self.getViews() function returns a list of window objects for every active page belonging to your extension.</p> <h3 jstcache="0">Example</h3> <pre jstcache="0">background_page.html (snippet): function updateUI(checked) { var views = chrome.self.getViews(); for (var i in views) { if (views[i].enableCheckbox) views[i].enableCheckbox(checked); } } toolstrip.html (snippet): function enableCheckbox(checked) { var elm = document.getElementById('checkbox'); elm.checked = checked; }</pre> </div> <!-- API PAGE --> <div class="apiPage" jsselect="apiDefinition" jstcache="3" style="display: none; "> <!-- METHODS --> <div jsdisplay="functions && functions.length > 0" class="apiGroup" id="methods" jstcache="4"> <a name="#methods" jstcache="0"></a> <h2 jstcache="0">Methods</h2> <!-- iterates over all functions --> <div class="apiItem" jsselect="functions" jstcache="7"> <a jsvalues=".name:'method-' + name" jstcache="10"></a> <!-- method-anchor --> <h3 jscontent="name" jstcache="11">method name</h3> <div class="summary" jstcache="0"><span jsdisplay="returns" jscontent="getTypeName(returns)" jstcache="16">void</span> <!-- Note: intentionally longer 80 columns --> <span jscontent="getFullyQualifiedFunctionName($this)" jstcache="17">chrome.module.methodName</span>(<span jsselect="parameters" jsvalues="class:optional ? 'optional' : ''" jstcache="18"><span jsdisplay="$index" jstcache="27">, </span><span jscontent="getTypeName($this)" jstcache="28"></span> <var jstcache="0"><span jscontent="name" jstcache="11"></span></var></span>)</div> <div class="description" jstcache="0"> <p class="todo" jsdisplay="!description" jstcache="19">Undocumented.</p> <p jsdisplay="description" jsvalues=".innerHTML:description" jstcache="20"> A description from the json schema def of the function goes here. </p> <!-- PARAMETERS --> <h4 jstcache="0">Parameters</h4> <dl jstcache="0"> <div jsselect="parameters" jstcache="29"> <!-- VALUE: This is a subtemplate that is used elsewhere via jsTemplate *transclude* --> <div id="valueTemplate" jstcache="0"> <dt jstcache="0"> <var jsdisplay="$this.name" jscontent="$this.name" jstcache="35">paramName</var> <em jstcache="0"> <!-- TYPE --> <div style="display:inline" jstcache="0"> ( <span class="optional" jsdisplay="optional" jstcache="37">optional</span> <span id="typeTemplate" jstcache="0"> <span jsdisplay="getTypeRef($this)" jstcache="38"> <a jsvalues=".href: getTypeRefPage($this) + '#type-' + getTypeRef($this)" jscontent="getTypeRef($this)" jstcache="40"> Type</a> </span> <span jsdisplay="!getTypeRef($this)" jstcache="39"> <span jsdisplay="isArray($this)" jstcache="41"> array of <span jsselect="items" jstcache="43"><span transclude="typeTemplate" jstcache="44"></span></span> </span> <span jsdisplay="!isArray($this)" jscontent="getTypeName($this)" jstcache="42">paramType</span> </span> </span> ) </div> </em> </dt> <dd class="todo" jsdisplay="!$this.description" jstcache="32"> Undocumented. </dd> <dd jsdisplay="$this.description" jsvalues=".innerHTML:$this.description" jstcache="33"> Description of this parameter from the json schema. </dd> <!-- OBJECT PROPERTIES --> <dd jsdisplay="shouldExpandObject($this)" jstcache="34"> <dl jstcache="0"> <div jsselect="getPropertyListFromObject($this)" jstcache="36"> <div transclude="valueTemplate" jstcache="15"> </div> </div> </dl> </dd> </div> <!-- /VALUE --> </div> </dl> <!-- RETURNS --> <h4 jsdisplay="returns" jstcache="21">Returns</h4> <dl jstcache="0"> <div jsselect="returns" jstcache="30"> <div transclude="valueTemplate" jstcache="15"> </div> </div> </dl> <!-- CALLBACK --> <div jsdisplay="hasCallback(parameters)" jstcache="22"> <div jsselect="getCallbackParameters(parameters)" jstcache="31"> <h4 jstcache="0">Callback function</h4> <p jstcache="0"> If you specify the <em jstcache="0">callback</em> parameter, it should specify a function that looks like this: </p> <!-- Note: intentionally longer 80 columns --> <pre jstcache="0">function(<span jscontent="getSignatureString(parameters)" jstcache="23">Type param1, Type param2</span>) <span class="subdued" jstcache="0">{...}</span>);</pre> <dl jstcache="0"> <div jsselect="parameters" jstcache="29"> <div transclude="valueTemplate" jstcache="15"> </div> </div> </dl> </div> </div> </div> <!-- /description --> </div> <!-- /apiItem --> </div> <!-- /apiGroup --> <!-- EVENTS --> <div jsdisplay="events && events.length > 0" class="apiGroup" jstcache="5"> <a name="#events" jstcache="0"></a> <h2 id="events" jstcache="0">Events</h2> <!-- iterates over all events --> <div jsselect="events" class="apiItem" jstcache="8"> <a jsvalues=".name:'event-' + name" jstcache="12"></a> <h3 jscontent="name" jstcache="11">event name</h3> <div class="summary" jstcache="0"> <!-- Note: intentionally longer 80 columns --> <span class="subdued" jstcache="0">chrome.bookmarks.</span><span jscontent="name" jstcache="11">onEvent</span><span class="subdued" jstcache="0">.addListener</span>(function(<span jscontent="getSignatureString(parameters)" jstcache="23">Type param1, Type param2</span>) <span class="subdued" jstcache="0">{...}</span>); </div> <div class="description" jstcache="0"> <p class="todo" jsdisplay="!description" jstcache="19">Undocumented.</p> <p jsdisplay="description" jsvalues=".innerHTML:description" jstcache="20"> A description from the json schema def of the event goes here. </p> <!-- PARAMETERS --> <h4 jstcache="0">Parameters</h4> <dl jstcache="0"> <div jsselect="parameters" jstcache="29"> <div transclude="valueTemplate" jstcache="15"> </div> </div> </dl> </div> <!-- /decription --> </div> <!-- /apiItem --> </div> <!-- /apiGroup --> <!-- TYPES --> <div jsdisplay="types && types.length > 0" class="apiGroup" jstcache="6"> <a name="#types" jstcache="0"></a> <h2 id="types" jstcache="0">Types</h2> <!-- iterates over all types --> <div jsselect="types" class="apiItem" jstcache="9"> <a jsvalues=".name:'type-' + id" jstcache="13"></a> <h3 jscontent="id" jstcache="14">type name</h3> <div transclude="valueTemplate" jstcache="15"> </div> </div> <!-- /apiItem --> </div> <!-- /apiGroup --> </div> <!-- /apiPage --> </div> <!-- /mainColumn --> </div> <!-- /pageContent --> <div id="pageFooter" --="" jstcache="0"> Copyright 2009 <br jstcache="0"> TBD: copyright/license should be automatically included here </div> <!-- /pageFooter --> </div> <!-- /container --> </body></html>
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