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This parameter was added in version
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<h1 class="page_title">Tutorial: Getting Started (Hello, World!)</h1>
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<!-- TABLE OF CONTENTS -->
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<h2>Contents</h2>
<ol>
<li>
<a href="#load">Create and load an extension</a>
<ol>
<li style="display: none; ">
<a>h3Name</a>
</li>
</ol>
</li><li>
<a href="#code">Add code to the extension</a>
<ol>
<li style="display: none; ">
<a>h3Name</a>
</li>
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</li><li>
<a href="#summary">Now what?</a>
<ol>
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<a>h3Name</a>
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<a href="#apiReference">API reference</a>
<ol>
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<a href="#properties">Properties</a>
<ol>
<li>
<a href="#property-anchor">propertyName</a>
</li>
</ol>
</li>
<li>
<a>Methods</a>
<ol>
<li>
<a href="#method-anchor">methodName</a>
</li>
</ol>
</li>
<li>
<a>Events</a>
<ol>
<li>
<a href="#event-anchor">eventName</a>
</li>
</ol>
</li>
<li>
<a href="#types">Types</a>
<ol>
<li>
<a href="#id-anchor">id</a>
</li>
</ol>
</li>
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</li>
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<!-- /TABLE OF CONTENTS -->
<!-- Standard content lead-in for experimental API pages -->
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For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page.
</p>
<!-- STATIC CONTENT PLACEHOLDER -->
<div id="static"><div id="pageData-name" class="pageData">Tutorial: Getting Started (Hello, World!)</div>
<div id="pageData-showTOC" class="pageData">true</div>
<p>
This tutorial walks you through creating a simple extension.
You'll add an icon to Google Chrome
that, when clicked, displays an automatically generated page.
The icon and page will look something like this:
</p>
<img src="images/hello-world-small.png" width="300" height="221" alt="a window with a grid of images related to HELLO WORLD">
<p>
You can develop extensions using any release of Google Chrome,
on Windows, Mac, or Linux.
</p>
<h2 id="load">Create and load an extension</h2>
<p>
In this section, you'll write an extension
that adds a <em>browser action</em>
to the toolbar of Google Chrome.
</p>
<ol>
<li>
Create a folder somewhere on your computer to contain your extension's code.
</li>
<li>
Inside your extension's folder,
create a text file called <strong><code>manifest.json</code></strong>,
and put this in it:
<pre>{
"name": "My First Extension",
"version": "1.0",
"description": "The first extension that I made.",
"browser_action": {
"default_icon": "icon.png"
},
"permissions": [
"http://api.flickr.com/"
]
}</pre>
</li>
<li>
Copy this icon to the same folder:<br>
<table cellpadding="0" cellspacing="0" style="border:0">
<tbody><tr>
<td style="text-align:center; border:0;"><a href="examples/tutorials/getstarted/icon.png"><img src="examples/tutorials/getstarted/icon.png" width="19" height="19" border="0"></a><br>
<a href="examples/tutorials/getstarted/icon.png">Download icon.png</a></td>
</tr>
</tbody></table>
</li>
<li id="load-ext"> Load the extension.
<ol type="a">
<li style="margin-top:0">
Bring up the extensions management page
by clicking the wrench icon
<img src="images/toolsmenu.gif" width="29" height="29" alt="" style="margin-top:0">
and choosing <b>Tools > Extensions</b>.
</li>
<li>
If <b>Developer mode</b> has a + by it,
click the + to add developer information to the page.
The + changes to a -,
and more buttons and information appear.
</li>
<li>
Click the <b>Load unpacked extension</b> button.
A file dialog appears.
</li>
<li>
In the file dialog,
navigate to your extension's folder
and click <b>OK</b>.
</li>
</ol> </li>
</ol>
<p>
If your extension is valid,
its icon appears next to the address bar,
and information about the extension
appears in the extensions page,
as the following screenshot shows.
</p>
<p>
<a href="images/load_after.png"><img src="images/load_after_small.png" width="300" height="132"></a>
</p>
<h2 id="code">Add code to the extension</h2>
<p> In this step, you'll make your extension <em>do</em> something besides just look good. </p>
<ol>
<li>
<p> Edit <code>manifest.json</code> to add the following line:</p>
<pre> ...
"browser_action": {
"default_icon": "icon.png"<b>,
"popup": "popup.html"</b>
},
...
</pre>
<p> Inside your extension's folder,
create a text file called <strong><code>popup.html</code></strong>,
and add the following code to it:</p>
<blockquote> <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/tutorials/getstarted/popup.html?content-type=text/plain" target="_blank">CSS
and JavaScript code for hello_world</a></blockquote>
</li>
<li>
Return to the extensions management page,
and click the <b>Reload</b> button
to load the new version of the extension.</li>
<li>Click the extension's icon.
A popup should appear that displays the contents of
<code>popup.html</code>. </li>
</ol>
<p> It should look something like this:</p>
<img src="images/hello-world.png" width="500" height="369" alt="a popup with a grid of images related to HELLO WORLD">
<p> If you don't see the popup,
try the instructions again,
following them exactly.
Don't try loading an HTML file that isn't in the extension's folder —
it won't work! </p>
<h2 id="summary">Now what?</h2>
<!-- [PENDING: Summarize what we did, what it means, what else we would've done if this were a real extension (e.g. package/zip it), and where to find more information.] -->
<p>
Here are some suggestions for what to read next:
</p>
<ul>
<li>
The <a href="overview.html">Overview</a>,
which has important conceptual and practical information
</li>
<li>
The
<a href="tut_debugging.html">debugging tutorial</a>,
which starts where this tutorial leaves off
</li>
<li>
The <a href="hosting.html">hosting</a> page,
which tells you about options for distributing your extension
</li>
</ul>
<p>
If you don't feel like reading, try these:
</p>
<ul>
<li>
Keep up to date with the latest news:
<a href="http://groups.google.com/a/chromium.org/group/chromium-extensions/subscribe">subscribe to chromium-extensions</a>
</li>
<li>
Look at some
<a href="samples.html">sample extensions</a>
</li>
<li>
Watch some
<a href="http://www.youtube.com/view_play_list?p=CA101D6A85FE9D4B">videos</a>, such as
<a href="http://www.youtube.com/watch?v=e3McMaHvlBY&feature=PlayList&p=CA101D6A85FE9D4B&index=3">How to build an extension</a>
</li>
</ul>
</div>
<!-- API PAGE -->
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<h2>API reference: chrome.apiname </h2>
<!-- PROPERTIES -->
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<h3 id="properties">Properties</h3>
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<a></a>
<h4>getLastError</h4>
<div class="summary">
<!-- Note: intentionally longer 80 columns -->
<span>chrome.extension</span><span>lastError</span>
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<!-- METHODS -->
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<!-- iterates over all functions -->
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<div class="summary"><span>void</span>
<!-- Note: intentionally longer 80 columns -->
<span>chrome.module.methodName</span>(<span><span>, </span><span></span>
<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 -->
<h4>Parameters</h4>
<dl>
<div>
<div>
</div>
</div>
</dl>
<!-- RETURNS -->
<h4>Returns</h4>
<dl>
<div>
<div>
</div>
</div>
</dl>
<!-- CALLBACK -->
<div>
<div>
<h4>Callback function</h4>
<p>
The callback <em>parameter</em> should specify a function
that looks like this:
</p>
<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 -->
</div> <!-- /apiItem -->
</div> <!-- /apiGroup -->
<!-- EVENTS -->
<div id="eventsTemplate" class="apiGroup">
<a></a>
<h3>Events</h3>
<!-- iterates over all events -->
<div class="apiItem">
<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 -->
</div> <!-- /apiItem -->
</div> <!-- /apiGroup -->
<!-- TYPES -->
<div class="apiGroup">
<a name="types"></a>
<h3 id="types">Types</h3>
<!-- iterates over all types -->
<div class="apiItem">
<a></a>
<h4>type name</h4>
<div>
</div>
</div> <!-- /apiItem -->
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©2011 Google
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