The extension I am using is called Simple Vimeo Downloader [Chrome Web Store | Github]. This extension only works when I manually click it and when it detects a Vimeo Player embedded in the page I am looking at.
I want to auto execute it every time I visit a page which has a Vimeo player embedded in it.
What code changes should I make and where?
Following the documentation, you'd need to include something like this in the manifest.json file:
"content_scripts": [
{
"matches" : ["<all_urls>"],
"css" : ["insert.css"],
"js" : ["execute_script.js"],
"all_frames" : true
}
],
Note that, in order to be injected in all the pages, you need the <all_urls> permission, which may delay the extension review time.
Related
With a Manifest v3 Chrome Extension, is it possible to load an extension HTML resource file into a new tab? I was thinking about providing a plugin with a larger, full-page user experience than what the popdown panel could provide. I created a page.html (just simple HTML for now, no JS or CSS) and put it in my extensions folder. I then added this to the manifest.json:
"web_accessible_resources": [
{
"resources": ["page.html"],
"matches": [ "*://*/*" ]
}
]
I reloaded the plugin and then tried navigating to this page in my browser with:
chrome://extensions/MY-EXTENSION-ID-GOES-HERE/page.html
I get an ERR_FAILED and "This site can't be reached" message.
There is no need for a web_accessible_resources in this case in the v3 manifest for this action. Just use something like the following code to open it from the service-worker.js:
chrome.tabs.create({url:chrome.runtime.getURL('page.html'),active:true});
This will automatically open something akin to...
chrome-extension://MY-EXTENSION-ID/page.html
...where MY-EXTENSION-ID is automatically filled in by chrome.runtime.getURL('page.html').
You can then reference remote and local resources in your HTML tags. For local resources, just use relative pathing. For remote resources, keep an eye on Google Chrome Extension developer policies.
Thanks goes to wOxxOm for his assistance.
I'm trying to implement an extension that can auto fill all fields in an application website. Currently it works great in main frame, but doesn't work if the fields are in a iframe.
I'm allowing users to either use content script to auto inject JS or click a button to inject JS manually.
The problem I have is my JS is not injecting into iframe even I set allFrames to true, but content script work.
"content_scripts" : [
{
"matches" : ["https://*/my_url/*"],
"js" : ["/auto_fill.js"],
"all_frames": true
}
]
This content scripts work fine, JS is being injected. However,
my_button.addEventListener('click', () => {
chrome.tabs.executeScript(null, {
file : "/auto_fill.js",
allFrames : true
})
});
This executeScript doesn't work, nothing happen.
The iframe I'm trying to work with is kinda a dynamic iframe (where I have to click few buttons to load and navigate to the application site I want)
Do I have to find out the iframe id or tab id in order for this to work, please provide some hints.
Please let me know if I'm not making myself clear.
Thank you so much for your time.
As the comments revealed, the extension is using the activeTab permission without host URL patterns (just as the documentation suggests), but this permission only grants access to the tab's main URL. When an iframe points to a different URL origin, it won't be granted by activeTab, which is an intentional restriction enforced since Chrome 45, see https://crbug.com/826433.
chrome.tabs returns undefined despite the fact I set tabs in the permissions block.
"permissions": [
"tabs",
"http://*/*",
"https://*/*"
],
"content_scripts": [
{
"matches": [
"http://*/*",
"https://*/*"
],
"js": [
"js/myScript.js"
],
"all_frames": true
}
],
But in myScript.js the following returns undefined.
chrome.tabs
As content script has its own limitations,
chrome.tabs is only available in background scripts and popup scripts.
If you wanna to use chrome.tabs then pass message from content_script to background script and play with chrome.tabs.
Content scripts have only limited access to Chrome APIs. This access does not include the API you are trying to use (e.g. chrome.tabs). If you need to use that API, you will have to do so in a background script1.
As listed in Chrome's content scripts documentation, the APIs available to a content script are [I have placed deprecated methods in strikethrough format]:
extension ( getURL , inIncognitoContext , lastError , onRequest , sendRequest )
i18n
runtime ( connect , getManifest , getURL , id , onConnect , onMessage , sendMessage )
storage
A couple of the listed APIs are deprecated and have been for some time. Those that are deprecated have moved to different locations (also listed above):
extension.onRequest ➞ runtime.onMessage
extension.sendRequest ➞ runtime.sendMessage
While not officially deprecated, extension.lastError is also available as runtime.lastError. At this point, it is usually referred to at that location:
extension.lastError ➞ runtime.lastError
Partition your extension into background scripts and content scripts
You are going to need to separate your code into what needs to be in a background script and what needs to be in content scripts, based on the capabilities available to each type of script. Content scripts have access to the DOM of the web page into which they are injected, but limited access to extension APIs. Background scripts have full access to the extension APIs, but no access to web page content. You should read the Chrome extension overview, and the pages linked from there, to get a feel for what functionality should be located in which type of script.
It is common to need to communicate between your content scripts and background scripts. To do so you can use message passing. This allows you to communicate information between the two scripts to accomplish things which are not possible using only one type of script.
For instance, in your content script, you may need information which is only available from one of the other Chrome APIs, or you need something to happen which can most appropriately (or only) be done through one of the other Chrome extension APIs. In these cases, you will need to send a message to your background script, using chrome.runtime.sendMessage(), to tell it what needs to be done, while providing enough informaiton for it to be able to do so. Your background script can then return the desired information, if any, to your content script. Alternately, you will have times when the processing will primarily be done in the background script. The background script may inject a content script, or just message an already injected script, to obtain information from a page, or make changes to the web page.
Background script means any script that is in the background context. In addition to actual background scripts, this includes popups and options pages, etc. However, the only page that you can be sure to have consistently available to receive messages from a content script are your actual background scripts defined in manifest.json. Other pages may be available at some times as a result of the user's interaction with the browser, but they are not available consistently.
This answer was moved from a duplicate question, and then modified.
https://developer.chrome.com/extensions/tabs#method-getSelected shows
getSelected
chrome.tabs.getSelected(integer windowId, function
callback)
Deprecated since Chrome 33. Please use tabs.query {active: true}.
Gets the tab that is selected in the specified window.
Maybe, you should use chrome.tabs.query in popup.js like this
chrome.tabs.query({active: true, currentWindow: true}, function(tabs){
console.log(tabs[0].url);
});
, reload your extension and check the result in the inspect element of your extension.
result image
code image
https://developer.chrome.com/extensions/tabs#type-Tab shows that
The URL the tab is displaying. This property is only present if the extension's manifest includes the "tabs" permission.(Just for remind someone forgot. I was forgot it when I just test it.)
Check this answer also https://stackoverflow.com/a/6718277/449345
This one worked for me
chrome.tabs.getSelected(null, function(tab){
console.log(tab);
});
I would like to know how to run the background script of a Chrome extension for only specific/specified domain/s please?
For example, if an extension is meant to run only on pages of Google.com, so there is no reason to keep the background script running on any other domains.
In my manifest file I have set "matches" but I can still see the background script running on every domain and tab.
...
"background": {
"matches": [
"*://*.google.com/*"
],
"scripts": ["scripts/background.js"],
"persistent": false
},
"content_scripts": [
{
"matches": [
"*://*.google.com/*"
],
"css": ["styles/default.css"],
"js": ["scripts/jquery.js", "scripts/default.js"]
}
],
"permissions": [
"storage",
"declarativeContent",
"tabs"
],
...
Edit
To add more info that will help understand my goal:
I have a content script and a popup, the popup is being used as a remote control with options to choose from and play with, that will eventually effects the page.
When changing an option in the popup, it sends it's value to the background/event script, there it being temporary saved in a variable, and then being sent to the content script, where it actually being executing and show up on the page to the user.
And I want that only when the user leaves the specific domain, the background/event script will save the settings to storage, so by that there will be only a single storage saving task and NOT each time the user is changing a setting in the popup.
After the settings got saved to storage and the user left, I want nothing to run it the background anymore please.
You are misunderstanding what the background page is for, and what "persistent": false means.
The background page does not run "for" any domain; it just runs. A single copy per extension. Have a look at the Architecture Overview.
However, if you are concerned that it consumes resources, you add "persistent": false to the manifest. This makes it an Event page, that is unloaded when it's not doing work.
If your event page is woken up only by content scripts, then you have achieved your goal: it won't be running when it's not needed.
It's entirely up to you to properly construct the background page so it's idle when you don't need it. Since you haven't told what it's supposed to be doing - well..
Do read the Event page documentation, there are important restrictions you need to understand.
Ok, so just the other day I learned that you can inspect the devtools if it is in its own window(explained here). I also learned that you can style the devtools with your own css by editing the Custom.css file in your profile on your computer(more on that here).
What I want to do is not only add css, but also javascript, via a chrome extension. I am very aware of devtools pages, but those do not do what I want. Pretty much I want to get a content script to run on the devtools inspector itself. I found one extension that does exactly this, but for the life of me I have not been able to replicate it(even when copy-pasting the code!!). The extension is the "Discover DevTools Companion extension" from Code School(on the webstore). They even explain how it works, but I still have had no luck. That was the only extension I have found that does what I want. So I guess what I'm really asking is if its just me that cannot get it to work or if others that try are having trouble also.
Usually, you cannot create a Chrome extension which injects code in a devtools page.
The "Discover DevTools Companion" extension from now on, referred to as DDC is allowed to do this, because this extension is whitelisted in the source code of Chromium: (this is no longer the case)
// Whitelist "Discover DevTools Companion" extension from Google that
// needs the ability to script DevTools pages. Companion will assist
// online courses and will be needed while the online educational programs
// are in place.
scripting_whitelist_.push_back("angkfkebojeancgemegoedelbnjgcgme");
If you want to publish an extension in the Chrome Web Store with these capabilities, give up.
If you want to create such an extension for personal / internal use, read further.
Method 1: Impersonate the DDC a whitelisted extension
The easiest way to create an extension with such permissions is to create an extension with the extension ID of a whitelisted extension (e.g. ChromeVox). This is achieved by copying the "key" key of its manifest file to your extension's manifest (see also: How to get the key?). This is a minimal example:
manifest.json
{
// WARNING: Do NOT load this extension if you use ChromeVox!
// WARNING: Do NOT load this extension if you use ChromeVox!
// WARNING: This is a REALLY BIG HAMMER.
"content_scripts": [{
"js": [ "run_as_devtools.js" ],
"matches": [ "<all_urls>" ]
}],
// This is the key for kgejglhpjiefppelpmljglcjbhoiplfn (ChromeVox)
"key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDEGBi/oD7Yl/Y16w3+gee/95/EUpRZ2U6c+8orV5ei+3CRsBsoXI/DPGBauZ3rWQ47aQnfoG00sXigFdJA2NhNK9OgmRA2evnsRRbjYm2BG1twpaLsgQPPus3PyczbDCvhFu8k24wzFyEtxLrfxAGBseBPb9QrCz7B4k2QgxD/CwIDAQAB",
"manifest_version": 2,
"name": "Elevated Devtools extension",
"version": "1.0"
}
run_as_devtools.js
if (location.protocol === 'chrome-devtools:') (function() {
'use strict';
// Whatever you want to do with the devtools.
})();
Note: This method is truly a hack. Since the extension shares the same ID as ChromeVox, both extensions cannot co-exist. And if Chrome decides to remove the whitelisted extension, then your permissions will evaporate.
Instead of filtering via the content script, you can also use the include_globs key to restrict the content script to devtools only.
Method 2: Modify resources.pak
I suggest to go with method 1 if possible. When method 1 fails (e.g. because the extension is no longer whitelisted), use the next method.
Get paktools.py, unpack.py and pack.py from DennisKehrig/patch_devtools (on Github).
Locate your Chrome directory containing resources.pak.
Run python2 unpack.py resources.pak, which creates a directory resources containing all files (all file names are numbers).
Locate the file containing a script which runs in the context of the developer tools. Add your desired code there.
Remove resources.pak
Run python2 pack.py resources to create the new resources.pak file.
Note: resources.pak may be replaced when Chrome is updated, so I suggest to create a script which automates my described algorithm. That shouldn't be too difficult.
If you're interested, you can look up the .pak file format in ui/base/resource/data_pack_literal.cc (description in human language).
For those googlers who end up at this page (as I did) looking for something else, this page answers the question of manipulating DevTools ITSELF - not adding jQuery to DevTools, or injecting javaScript onto a web page. For those, see here instead:
Inject jQuery into DevTools (Chrome or Firefox):
Firefox DevTools: Automatically injecting jQuery
Inject your own javascript/css onto any web page:
How to edit a website's background colors