I have a very simple chrome extension, where I'm trying to pass a message from the background script to the content script. But chrome.runtime is undefined.
Here's literally all the code, as you can see there's almost nothing to it. In the content script, runtime is undefined.
Background Script:
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.runtime.sendMessage({action: 'someAction'},
function(response) {
console.log('Response: ', response);
});
});
Content Script:
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
sendResponse({
user: 'user'
});
});
manifest.json
{
"manifest_version": 2,
"name": "My Extension",
"version": "1.0",
"description": "Some stupid extension",
"browser_action": {
"default_icon": "icons/MyExtensionIcon.png"
},
"icons": {
"48": "icons/MyExtensionIcon.png"
},
"permissions": [
"tabs",
"storage",
"https://*/",
"http://*/"
],
"content_scripts": [
{
"matches": ["*://*.twitter.com/*", "https://twitter.com/*"],
"js": ["js/content.js"]
}
],
"background": {
"scripts": ["js/background.js"],
"persistent": true
},
"web_accessible_resources": [
"js/*",
"css/*"
]
}
Other Info:
Chrome Version 58.0.3029.110 (64-bit)
Installing my extension as an
"Unpacked extension" with developer mode
Ok I figured it out. It's absolutely stupid, but it appears this is simply a Heisenbug. By adding a breakpoint, or debugger statement, it causes that value to be undefined. Maybe a chrome bug?
I swear, every day Chrome feels more, and more like Internet Explorer.
Related
manifest.json
{
"manifest_version": 2,
"name": "Project",
"description": "Chrome Extension for sending messages",
"version": "1.0",
"browser_action": {
"default_icon": "red_dot.png"
},
"permissions": [
"activeTab",
"https://ajax.googleapis.com/",
"storage"
],
"background" : {
"scripts" : ["background.js"]
},
"content_scripts": [
{
"matches":["https://www.website.com/*"],
"js":["keypress.js", "jquery.js", "js_file.js"],
"run_at": "document_end"
}
]
}
background.js
var running = false
chrome.browserAction.onClicked.addListener(function(tab) {
if (running) {
alert('script is running, turning off');
chrome.browserAction.setIcon({path: "red_dot.png"})
running = false
} else {
alert('script is not running, turning on');
chrome.browserAction.setIcon({path: "green_dot.jpg"})
running = true
}
});
When I click on the icon, I get the popup as expected, but the icon itself isn't changing.
I'm getting this error:
Unchecked runtime.lastError: Icon invalid.
but I don't understand why. The code seems valid.
use this api and carefully enter params specifically path
https://developer.chrome.com/extensions/browserAction#method-setIcon
I'm trying to capture the visible area of a page using chrome.tabs.captureVisibleTab. Here is the code that makes the call:
chrome.extension.onMessage.addListener(function(request, sender, sendResponse) {
if (request.name == 'screenshot') {
chrome.tabs.captureVisibleTab(null, null, function(dataUrl) {
sendResponse({ screenshotUrl: dataUrl });
});
}
});
But when I try to capture the tab I get this error:
Unchecked runtime.lastError while running tabs.captureVisibleTab: The 'activeTab' permission is not in effect because this extension has not been in invoked.
Here is my manifest file:
{
"manifest_version": 2,
"name": "Empathy",
"version": "0.1",
"description": "Simulate accessibility issues for websites.",
"browser_action": {
"default_icon": "empathy19.png",
"default_title": "Empathy!"
},
"permissions": [
"activeTab",
"contextMenus",
"desktopCapture",
"tabCapture",
"tts" // Text-to-speech
],
"background": {
"scripts": [
"boot.js"
],
"persistent": false
},
"content_scripts": [
{
"matches": ["<all_urls>"],
"js": [
"src/helpers.js",
"src/colorblindness.js",
"lib/colorvision.js",
"lib/html2canvas.js"
]
}
]
}
I have active tab permissions
The call is being made from a background script
I'm matching <all_urls>
Why do I get that error?
There are things that talk about <all_urls> as something to match, but what I was missing was the <all_urls> permission. After I added the permission, it worked.
I'm essentially just trying to get the current tab url if they're on youtube.com. I keep getting an error from the script.
Error:
Uncaught TypeError: Cannot call method 'getSelected' of undefined
Manifest
{
"name": "YouTube Fix",
"version": "0.0.1",
"manifest_version": 2,
"description": "Fix some of the annoying little things in YouTube.",
"icons": {
"16": "icon.png",
"48": "icon.png",
"128": "icon.png"
},
"content_scripts": [{
"matches": ["http://www.youtube.com/*"],
"js": ["background.js"],
"run_at": "document_start"
}],
"permissions": ["tabs"]
}
Background.js
//this is what is giving me the error:
chrome.tabs.getSelected(null, function (tab) {
myFunction(tab.url);
});
function myFunction(tablink) {
if (tablink == "http://www.youtube.com") {
window.location = "http://www.youtube.com/feed/subscriptions/u";
}
document.getElementById("comments-textarea").disabled = false;
}
The following forks fine, no need for chrome.tabs.getSelected(null, function (tab) {}),because your page always runs for "matches": ["http://www.youtube.com/*"],;
More over add this condition to your code if(document.getElementById("comments-textarea") != null){
Working background.js
if (window.location == "http://www.youtube.com") {
window.location = "http://www.youtube.com/feed/subscriptions/u";
}
if (document.getElementById("comments-textarea") != null) {
document.getElementById("comments-textarea").disabled = false;
}
manifest.json
{
"name": "YouTube Fix",
"version": "0.0.1",
"manifest_version": 2,
"description": "Fix some of the annoying little things in YouTube.",
"content_scripts": [{
"matches": ["http://www.youtube.com/*"],
"js": ["background.js"],
"run_at": "document_start"
}],
"permissions": ["tabs"]
}
Let me know if you need more information.
You're running background.js as a content script rather than a background or event page, and https://developer.chrome.com/extensions/content_scripts.html says that "content scripts have some limitations. They cannot … Use chrome.* APIs (except for parts of chrome.extension)"
Instead, you should put something like
"background": {
"scripts": ["background.js"],
"persistent": false
},
into your manifest. See https://developer.chrome.com/extensions/event_pages.html for more details.
Quoted from here: https://groups.google.com/a/chromium.org/forum/?fromgroups=#!topic/chromium-extensions/A5bMuwCfBkQ
chrome.tabs.getSelected() is deprecated. The following page explains
how to use chrome.tabs.query instead:
http://code.google.com/chrome/extensions/whats_new.html#16 The relevant bit of text is:
"""
The methods getAllInWindow() and getSelected() have been deprecated.
To get details about all tabs in the specified window, use
chrome.tabs.query() with the argument {'windowId': windowID}. To get
the tab that is selected in the specified window, use
chrome.tabs.query() with the argument {'active': true}.
"""
chrome.tabs.getSelected is deprecated. Use chrome.tabs.query instead:
chrome.tabs.query({
"active": true
}, function(tab){
console.log(tab[0]); //selected tab
});
Also, content scripts can not access chrome.tabs APIs. Do this:
chrome.extension.getBackgroundPage().chrome.tabs.query(...
(This might not work. Not tested.)
im trying some stuff with chrome exstion API, and i want to send a data from the background.js to the contentscrip.js . everything i did fails, even tried the copy and paste the google example, and still no go. (doing this for 2 days lol)
here is my json file:
{
"name": "BlaExtension",
"version": "0.1",
"description": "bla the the exstion",
"permissions": [
"tabs","http://*/*","https://*/*"
],
"background": {
"scripts": ["background.js"]
},
"content_scripts": [
{
"matches": ["http://*/*","https://*/*"],
"js": ["content_script.js"]
}
],
"permissions": [
"tabs", "http://www.google.com/*"
],
"manifest_version": 2
}
background.js
chrome.tabs.getSelected(null, function (tab) {
chrome.tabs.sendMessage(tab.id, { greeting: "hello" }, function (response) {
alert(foo);
});
});
content_script.js
chrome.extension.onMessage.addListener(function (request, sender, sendResponse) {
alert(request.greeting);
});
i tried looking for help in old posts on messaging here on stackoverflow but nothing seem to help.
what im doing worng?
(sorry for my english)
Having trouble, and wasnt finding anything else on here that answered what I have :/
Manifest:
{
"name": "Item Sniper",
"version": "1.0",
"description": "Sniper",
"browser_action": {
"default_icon": "face.png",
"default_title": "Sniper"
},
"background": {
"scripts": ["background.js"]
},
"permissions": [
"tabs",
"notifications",
"http://*/*"
]
}
Background.js:
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.executeScript(null,{file: "buy.js"});
}
);
chrome.extension.onRequest.addListener(
function(request, sender, sendResponse) {
var notify = webkitNotifications.createNotification(
'face.png', // icon url - can be relative
'Hello!', // notification title
'Oh hellow!' // notification body text
);
});
Buy.js [There's more to it, but this is the notification part]:
chrome.extension.sendRequest({msg: "Sup?"}, function(response) { // optional callback - gets response
console.log(response.returnMsg);
});
I basically want the content script to create a notification, but I didnt know if it was possible while sticking with a js script as background :/
Thanks for any help,
Alex
The background property is only available for manifests using version 2. If you want to support this you'll need to update your manifest to the following;
{
"name": "Item Sniper",
"version": "1.0",
"description": "Sniper",
"manifest_version": 2,
"minimum_chrome_version": "18",
"browser_action": {
"default_icon": "face.png",
"default_title": "Sniper"
},
"background": {
"scripts": ["background.js"]
},
"permissions": [
"tabs",
"notifications",
"http://*/*"
]
}
Notice that I also set the minimum_chrome_version property to 18 as manifest version 2 can only be used when targeting this version of Chrome or newer.
I think you missed to call notify.show(); in your background.js
chrome.extension.onRequest.addListener(
function(request, sender, sendResponse) {
var notify = webkitNotifications.createNotification(
'face.png', // icon url - can be relative
'Hello!', // notification title
'Oh hellow!' // notification body text
);
notify.show();
});
http://code.google.com/chrome/extensions/notifications.html#api