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POChrome Extension: How to detect if an extension is installed using Content Scripts
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  1. POChrome Extension: How to detect if an extension is installed using Content Scripts
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    copied!<p>I am asking this question after looking at several related questions on stackoverflow. I started with <a href="https://stackoverflow.com/a/6293601/206613">how to detect if an extension is installed</a>. I opted for the method where I add a div to body using content scripts on some pages. Here is how I did it...</p> <p>manifest.json</p> <pre><code>{ "name": "Install Check", "content_scripts": [ { "matches": ["http://host.com/*"], "js" : ["insert_node.js"] } ], "permissions": [ "tabs", "host.com/*" ] } </code></pre> <p>insert_node.js (content script)</p> <pre><code>var insert_node = document.createElement('div'); insert_node.id = "HOST_SITE"; document.body.appendChild(insert_node); </code></pre> <p>host page</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;/head&gt; &lt;body&gt; &lt;h1&gt;This is a host site. Welcome!!!&lt;/h1&gt; &lt;script src="jquery.js"&gt;&lt;/script&gt; &lt;script src="notification.js"&gt;&lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>extension install script</p> <pre><code>$(document).ready(function() { if ($('#HOST_SITE').length &gt; 0) { alert("you have our extension installed"); } else { alert("not installed"); } }); </code></pre> <p>My problem is that the alert with message <code>not_installed</code> always pops up before the chrome can inject the node in DOM. I read about <code>run_at</code> attribute in <a href="https://stackoverflow.com/a/6124054/206613">manifest.json over here</a>. But that didn't solve the problem either. I tried all the three <code>document_start</code>, <code>document_idle</code>, <code>document_end</code> values. What am I doing wrong over here?</p>
 

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