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POChrome Extension - Get DOM content
 

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    <p>I'm trying to access the activeTab DOM content from my popup. Here is my manifest:</p> <pre><code>{ "manifest_version": 2, "name": "Test", "description": "Test script", "version": "0.1", "permissions": [ "activeTab", "https://api.domain.com/" ], "background": { "scripts": ["background.js"], "persistent": false }, "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'", "browser_action": { "default_icon": "icon.png", "default_title": "Chrome Extension test", "default_popup": "index.html" } } </code></pre> <p>I'm really confused whether background scripts (event pages with persistence: false) or content_scripts are the way to go. I've read all the documentation and other SO posts and it still makes no sense to me.</p> <p>Can someone explain why I might use one over the other.</p> <p>Here is the background.js that I've been trying:</p> <pre><code>chrome.extension.onMessage.addListener( function(request, sender, sendResponse) { // LOG THE CONTENTS HERE console.log(request.content); } ); </code></pre> <p>And I'm just executing this from the popup console:</p> <pre><code>chrome.tabs.getSelected(null, function(tab) { chrome.tabs.sendMessage(tab.id, { }, function(response) { console.log(response); }); }); </code></pre> <p>I'm getting:</p> <pre><code>Port: Could not establish connection. Receiving end does not exist. </code></pre> <p><strong>UPDATE:</strong></p> <pre><code>{ "manifest_version": 2, "name": "test", "description": "test", "version": "0.1", "permissions": [ "tabs", "activeTab", "https://api.domain.com/" ], "content_scripts": [ { "matches": ["&lt;all_urls&gt;"], "js": ["content.js"] } ], "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'", "browser_action": { "default_icon": "icon.png", "default_title": "Test", "default_popup": "index.html" } } </code></pre> <p>content.js</p> <pre><code>chrome.extension.onMessage.addListener( function(request, sender, sendResponse) { if (request.text &amp;&amp; (request.text == "getDOM")) { sendResponse({ dom: document.body.innertHTML }); } } ); </code></pre> <p>popup.html</p> <pre><code>chrome.tabs.getSelected(null, function(tab) { chrome.tabs.sendMessage(tab.id, { action: "getDOM" }, function(response) { console.log(response); }); }); </code></pre> <p>When I run it, I still get the same error:</p> <pre><code>undefined Port: Could not establish connection. Receiving end does not exist. lastError:30 undefined </code></pre>
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