Introduction
Google chrome has a feature that allows you to create shortcuts to web pages and make them appear like traditional desktop applications.
For example, a shortcut to twitter mobile might be
C:\Users\<username>\AppData\Local\Google\Chrome\Application\chrome.exe --app=https://mobile.twitter.com/
The file icon for this app is stored in
C:\Users\<username>\AppData\Local\Google\Chrome\User Data\Default\Web Applications\mobile.twitter.com\https_80
My Question
It's been a while since I've used this feature and I seem to remember that you could add your own JavaScript files to the app folder which were included when the application was loaded. However, I cannot find any documentation that discusses this feature but I'm 99% certain it exists.
Does anyone have any details if this feature is available and what files I need to create?
Clarification
I'm basically opening a webpage using Chrome's "Application Shortcut" and I want this webpage to refresh every x seconds. However, I do not have control over this webpage.
I'm sure in older versions of Chrome this used to be possible... unless I'm going mad.
Chrome extensions and their content scripts are also loaded when Chrome starts in the App mode.
So, you can create a simple extension, which injects JavaScript code in the page as follows:
manifest.json
file{ "name": "Run code on twitter mobile", "version": "1.0", "manifest_version": 2, "content_scripts": [ { "js": [ "contentscript.js" ], "matches": [ "https://mobile.twitter.com/*" ] } ], "web_accessible_resources": [ { "resources": [ "script.js" ], "matches": [ "https://mobile.twitter.com/*" ] } ] }
Then, create a file called contentscript.js
, and add the desired JavaScript code.
This script is included at every load of the matched page. All DOM methods, via the document
object is directly available. However, window
and document.defaultView
do not point to the window
object in the page [source].
If you want to access global methods or properties, you have to dynamically create a <script>
, and inject it in the page (see Building a Chrome Extension - Inject code in a page using a Content script).
contentscript.js
var s = document.createElement('script'); s.src = chrome.extension.getURL('script.js'); (document.head||document.documentElement).appendChild(s); s.onload = function() { s.parentNode.removeChild(s); };
Then, create a file called script.js
, and place it in the same folder as manifest.json
and contentscript.js
. The code in script.js
executes as if it was a true part of the affected page.
Reference for content scripts.
Reference for web accessible resources.
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