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POReplace symbols on a webpage with Chrome extension
 

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    <p>I'm trying to figure out how to write a simple Chrome extension which allows to transliterate web pages from one alphabet to another. Unfortunately Google's documentation on Chrome extensions is pretty much confusing for a beginner. I've seen a lot of similar questions here, f.ex. <a href="https://stackoverflow.com/questions/5797661/replace-text-in-website-with-chrome-content-script-extension">Replace text in website with Chrome content script extension</a>, but still can't get it clear. In a trial run I'm trying to replace all "a"'s in the page with "Z"'s.</p> <p>Here's my Manifest.json:</p> <pre><code>{ "name": "My Chrome extension", "version": "0.1", "browser_action": { "default_icon": "icon.png" }, "permissions": [ "tabs", "http://*/*", "https://*/*" ], "content_scripts": [{ "matches": ["http://*/*", "https://*/*"], "js": ["myscript.js"] }] } </code></pre> <p>Myscript.js:</p> <pre><code>chrome.browserAction.onClicked.addListener(function(tab) { chrome.tabs.executeScript( null, {code:"document.body.innerHTML = document.body.innerHTML.replace(new RegExp("a", "g"), "Z")"}); }); </code></pre> <p>But this fails to work. If I include only one line into Myscript.js:</p> <pre><code>document.body.innerHTML = document.body.innerHTML.replace(new RegExp("a", "g"), "Z"); </code></pre> <p>then all 'a' letters get replaced with 'Z' as soon as the page has loaded, but this is not my goal, as I want to get it working only after the extension button is pressed.</p> <p>Any help will be much appreciated.</p>
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    1. COWarning: Using `document.body.innerHTML = ...` will remove all of the existing event listeners, as well as non-attribute properties.
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