Chrome extension
From Publication Station
Creating a Chrome browser extension can be extremely simple.
https://developer.chrome.com/extensions/getstarted provides a good starting point tutorial. But I'll try provide a simpler tutorial, on how to create a extensions that turns the background of pages red and rotates all the elements.
We'll start by creating an extension folder
And adding to it the following files:
manifest.jsona metadata file in JSON format containing properties of your extension: name, description, version numbericon.pngthe icon of the extensionpopup.htmlcontent shown when user clicks the extension iconjquery-3.1.1.min.jsa jquery library downloadedcontent.jsJavasScript file where we'll add the action we'll like the extension to perform
files
manifest.json
{
"manifest_version": 2,
"name": "Communist extension",
"description": "This extension turns you page red",
"version": "1.0",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"permissions": [ ],
"content_scripts": [
{
"matches": ["<all_urls>" ],
"js": ["jquery-3.1.1.min.js", "content.js"]
}
]
}
popup.html
<!doctype html>
<!--
This page is shown when the extension button is clicked, because the
"browser_action" field in manifest.json contains the "default_popup" key with
value "popup.html".
-->
<html>
<head>
<title>Getting Started Extension's Popup</title>
<style>
body {
background:red;
color: white;
}
</style>
<!--
- JavaScript and HTML must be in separate files: see our Content Security
-->
</head>
<body>
<h2>Red extention</h2>
</body>
</html>
content.js
console.log('hello from red extension');
/* make body background red; all elements ('*') with blue color and rotated 180deg */
$('body').css('background', 'red', 'important');
$('*').css('color','blue', 'important');
$('*').css('-webkit-transform','rotate(180deg)', 'important')
load the extension
To load the extension:
- visit chrome://extensions in your brows
- Ensure that the Developer mode checkbox in the top right-hand corner is checked.
- Click Load unpacked extension… to pop up a file-selection dialog.
- Navigate to the directory in which your extension files live, and select it.
- Alternatively, you can drag and drop the directory where your extension files live onto chrome://extensions in your browser to load it.
- If the extension is valid, it'll be loaded up and active right away! If it's invalid, an error message will be displayed at the top of the page. Correct the error, and try again.
