I am trying to create a channel to my Google App Engine (Python) server, and there seems to be a problem but I am unsure why. When the user toggles the extension, it authenticates the user. If successful, the server replies with a channel token which I use to create the channel. When I authenticate the user, alert("a") appears, but alert("b") does not which makes me believe there is a problem with the line var channel = new goog.appengine.Channel(msg.token);, but the console does not report an error.
I have also copied the javascript code from here and placed it in my manifest as oppose to putting <script type="text/javascript" src="/_ah/channel/jsapi"></script> in background.html.
//script.js
function authenticate(callback) {
var url = "https://r-notes.appspot.com/init/api/authenticate.json?username=" + username + "&password=" + password;
$.post(url, function(data) {
if (data.status == "200") {
channelToken = data.channeltoken;
if (callback) {
callback();
}
var port = chrome.extension.connect({name: "myChannel"});
port.postMessage({token: channelToken});
port.onMessage.addListener(function(msg) {
console.log(msg.question);
});
}
});
}
//background.html
chrome.extension.onConnect.addListener(function(port) {
port.onMessage.addListener(function(msg) {
alert("a"); //pops up
var channel = new goog.appengine.Channel(msg.token);
alert("b"); //does not pop up
console.log(channel); //display error ' Error in event handler for 'undefined': ReferenceError: goog is not defined '
var socket = channel.open()
socket.onopen = function() {
// Do stuff right after opening a channel
console.log('socket opened');
}
socket.onmessage = function(evt) {
// Do more cool stuff when a channel message comes in
console.log('message recieved');
console.log(evt);
}
});
});
//manifest.json
{
"name": "moot",
"description": "Clicking on the moot button will display a sidebar!",
"version": "0.2.69",
"background_page": "html/background.html",
"browser_action": {
"default_icon": "img/icon_64.png",
"default_title": "moot"
},
"content_scripts": [
{
"matches": ["<all_urls>"],
"js": ["js/channelApi.js",
"js/script.js", "js/mootsOnSidebar.js", "js/mootsOnPage.js", "js/authenticate.js", "js/otherFunctions.js",
"js/jquery/jquery-1.7.1.js", "js/jquery/jquery.mCustomScrollbar.js", "js/jquery/jquery-ui.min.js",
"js/jquery/jquery.autosize.js", "js/jquery/jquery.mousewheel.min.js", "js/jquery/jquery.easing.1.3.js",
"js/channel.js"],
"css": ["css/cssReset.css", "css/sidebar.css", "css/onPageCreate.css", "css/onPageExists.css", "css/scrollbar.css", "css/authenticate.css"]
}
],
"permissions": [
"tabs", "contextMenus", "http://*/*", "https://*/"
],
"icons": {
"16": "img/icon_16.png",
"64": "img/icon_64.png"
}
}
EDIT - After doing console.log(channel), I discovered the error ' Error in event handler for 'undefined': ReferenceError: goog is not defined '. I am unsure why I receive this error as I did include the required javascript file as I followed this post.
So the solution is that you need to include the file <script type="text/javascript" src="https://talkgadget.google.com/talkgadget/channel.js"></script> in a HTML page. I placed this on the first row of background.html.
My mistake was saving a local copy of channel.js, and refer to it in manifest.json.
I'm now going to place a copy of channel.js on my server, and refer to my server's copy. I don't think there will be any issues with that.
Make a console log for the value of msg direct between alert("a") and var channel = ...
and inspect the value.
Related
All of the information I can find on this is pretty old. Like the title says I am trying to make a global variable in one script and access it from another. The purpose of the extension is to search for a class named "page-title" and then return the innerHTML of that HTML element. Once I get the code working I will specify the URL I want the extension to run on so it's not constantly running.
After a couple iterations trying to accomplish this in different ways I followed the method explained in this answer but my needs have different requirements and I am receiving the error "Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist." tied to the popup.html.
I tried the Unchecked runtime error solution found here but it's been awhile (~ 7 years) since I've dived into any coding and I'm not sure I implemented it correctly.
I've also tried to pass the value between JS documents is the HTML injection method, but without overriding security defaults in the manifest that doesn't really work. It also seemed super bootstrappy and I wanted to pass the information in a more conventional way. I tried creating a global variable by simply declaring the variable outside of a function/class/if statement and loading that .js file first, but that was unsuccessful as well.
Manifest
"name": "P.P. to Sharepoint",
"version": "1.0.0",
"description": "Open P.P. client folder in sharepoint",
"manifest_version": 3,
"author": "Zach Morris",
"action":{
"default_popup": "popup.html",
"default_title": "Open Sharepoint Folder"
},
"background": {
"service_worker": "background.js"
},
"permissions": [
"activeTab",
"tabs",
"scripting",
"notifications"
],
"content_scripts": [{
"js": ["contentScript.js"],
"matches": ["<all_urls>"]
}]
}
popup.html
My popup.html is super simple and really just has a button to press. I included all the .js files in the order I thought necessary
<script src="globalVariable.js"></script>
<script src="contentScript.js"></script>
<script src="popup.js"></script>
<script src="script.js"></script>
<script src="background.js"></script>
globalVariable.js
This one is straight forward. I need to pull the client's name out of the HTML of the page then use it in an API call when I click the button in popup.js This initializes the variable and uses it as place holder.
var clientInfo = {
name: 'test name'
};
ContentScript.js
I only want to run this if importScripts is not undefined. So I threw it in the if statement. Then I make sure I pulled a client name from the page. If not I throw an error message saying no client was found.
if( 'function' === typeof importScripts) {
importScripts('globalVariable.js');
addEventListener('message', onMessage);
function onMessage(e) {
if(b[0]) {
clientInfo.name = b[0].innerHTML;
alert(clientInfo.name + ' was assigned!');
} else {
alert('There is no client on this screen ' + 'b[0] is ' + b[0] + " clientInfo = " + clientInfo.name);
};
};
} else {
console.log("Your stupid code didn't work. ");
}
popup.js
This one pulls up the globalVariable.js to use the clientInfo. and makes a call to the button in background.js
if( 'function' === typeof importScripts) {
importScripts('globalVariable.js');
addEventListener('message', onMessage);
function onMessage(e) {
const text = clientInfo.name;
const notify = document.getElementById( 'myButton' );
notify.addEventListener( 'click', () => {
chrome.runtime.sendMessage( '', {
type: 'notification',
message: text });
} );
}
}
background.js
Same thing here. I import the globalVariable script to use the global variable. The notification will eventually be replaced with the API call when the rest of the code is working properly. I probably don't need to import the script here to access the variable because I can mass it with the event listener in popup.js, but I put it in here out of desperation.
if( 'function' === typeof importScripts) {
importScripts('globalVariable.js');
addEventListener('message', onMessage);
function onMessage(e) {
// do some work here
chrome.runtime.onMessage.addListener( data => {
if ( data.type === 'notification' ) {
chrome.notifications.create(
'',
{
type: 'basic',
title: 'Notify!',
message: data.message || 'Notify!',
iconUrl: 'notify.png',
}
);
console.log("sent notification");
};
});
}
}
You can have the popup.js listen for a button click and content.js handle all the logic of finding the correct element.
popup.js
document.querySelector('#btn').addEventListener('click', () => {
chrome.tabs.query({ active: true, currentWindow: true }, (tabs) =>
chrome.tabs.sendMessage(tabs[0].id, { command: 'getClientName' })
);
});
content.js
chrome.runtime.onMessage.addListener((msg, sender, response) => {
if (msg.command === 'getClientName')
findClientName(document.querySelectorAll('h3.page-title'));
});
Example of findClientName function:
const findClientName = async (element) => {
let clientName;
if (element.length > 0) {
element.length === 1
? (clientName = setClientName(element[0]))
: handleMultipleElements(element);
} else {
handleNoClientNameFound();
}
clientName ? await makeAPIRequest(clientName) : null;
};
Try this method instead maybe?
{
var x = 2;
}
so:
{
var clientInfo = {
name: 'test name'
};
}
Not very good at this language, so I thought maybe you're missing the brackets?
I am working on building a Javascript (in-browser) Instagram bot. However, I ran into a problem.
If you run this script, the first function will be called and the page will be redirected to "https://www.instagram.com/explore/tags/samplehashtag/" and the second function will be called immediately after (on the previous URL before the page changes to the new URL). Is there a way to make the second function be called after this second URL has been loaded completely?
I have tried setting it to a Window setInterval() Method for an extended time period, window.onload and a couple of other methods. However, I can't seem to get anything to work. Any chance someone has a solution?
This is my first chrome extension and my first real project, so I may be missing something simple..
manifest.json
{
"name": "Inject Me",
"version": "1.0",
"manifest_version": 2,
"description": "Injecting stuff",
"homepage_url": "http://danharper.me",
"background": {
"scripts": [
"background.js"
],
"persistent": true
},
"browser_action": {
"default_title": "Inject!"
},
"permissions": [
"https://*/*",
"http://*/*",
"tabs"
]
}
inject.js
(function() {
let findUrl = () => {
let hashtag = "explore/tags/samplehashtag/";
location.replace("https://www.instagram.com/" + hashtag);
}
findUrl();
})();
background.js
// this is the background code...
// listen for our browerAction to be clicked
chrome.browserAction.onClicked.addListener(function(tab) {
// for the current tab, inject the "inject.js" file & execute it
chrome.tabs.executeScript(tab.ib, {
file: 'inject.js'
});
});
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
chrome.tabs.executeScript(tab.ib, {
file: 'inject2.js'
});
});
inject2.js
(function() {
if (window.location.href.indexOf("https://www.instagram.com/explore/tags/samplehashtag/") != -1){
let likeAndRepeat = () => {
let counter = 0;
let grabPhoto = document.querySelector('._9AhH0');
grabPhoto.click();
let likeAndSkip = function() {
let heart = document.querySelector('.glyphsSpriteHeart__outline__24__grey_9.u-__7');
let arrow = document.querySelector('a.coreSpriteRightPaginationArrow');
if (heart) {
heart.click();
counter++;
console.log(`You have liked ${counter} photographs`)
}
arrow.click();
}
setInterval(likeAndSkip, 3000);
//alert('likeAndRepeat Inserted');
};
likeAndRepeat();
}
})();
It is not clear from the question and the example, when you want to run your function. But in chrome extension there is something called Message Passing
https://developer.chrome.com/extensions/messaging
With message passing you can pass messages from one file to another, and similarly listen for messages.
So as it looks from your use case, you can listen for a particular message and then fire your method.
For example
background.js
chrome.runtime.sendMessage({message: "FIRE_SOME_METHOD"})
popup.js
chrome.runtime.onMessage.addListener(
function(request) {
if (request.message == "FIRE_SOME_METHOD")
someMethod();
});
EDIT
Also if you want to listen for the URL changes, you can simply put a listener provided as in the documentation.
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
console.log('updated tab');
});
I want to run console app by clicking button on webpage
Console app will get Information and put in clipboard, and then I will get that information on webpage.
I am following this blog
I did this 3-4 times, all other things looks fine, but console app is not being called/executed.
I am getting these errors.
on webpage console
Unchecked runtime.lastError: The message port closed before a response was received.
on background file
Unchecked runtime.lastError: Specified native messaging host not found.
Unchecked runtime.lastError: The message port closed before a response was received.
my codes are
manifest.json
{
"name": "EID Reader",
"version": "1.0",
"manifest_version": 2,
"description": "Read Emirates ID",
"permissions": [ "contextMenus", "activeTab", "clipboardRead", "nativeMessaging" ],
"icons": {
"16": "eid16.png",
"48": "eid48.png",
"128": "eid128.png"
},
"background": {
"scripts": [ "eid.js" ]
},
"content_scripts": [
{
"matches": [ "http://*/*", "https://*/*", "file://*/*"],
"js": [ "content_script.js", "jquery-3.3.1.js" ],
"all_frames": true,
"run_at": "document_start"
}
]
}
content_script.js
// Listener to catch the event raised by the webpage button
document.addEventListener("EID_EVENT", function (data) {
// send message to background process to read emirates ID and send back the data
chrome.runtime.sendMessage("ifligfijbkpijeafdfbpljjibfbppmeb", function (response) {
});
});
// Listener to catch the data coming from the background process
chrome.extension.onMessage.addListener(function (msg, sender, sendResponse) {
if (msg.action == 'EID_DATA') {
//Parse the data and fill the form accordingly
try {
var json = $.parseJSON(msg.response);
$(json).each(function (i, val) {
$.each(val, function (key, value) {
if (key == 'EIDNumber')
$("#txtNumber").val(value);
if (key == 'Name')
$("#txtName").val(value);
if (key == 'Email')
$("#txtEmail").val(value);
if (key == 'PassportNumber')
$("#txtPassport").val(value);
});
});
}
catch (e) {
var error = "error" + e;
}
}
});
eid.js (background)
var port = null;
var tabId = null;
/* listener for messages coming from the content_scrip */
chrome.runtime.onMessage.addListener(function (message, sender, sendResponse) {
tabId=sender.tab.id;
var hostName = "ae.eid.chrome";
port = chrome.runtime.connectNative(hostName);
port.onDisconnect.addListener(onDisconnected);
});
/* THIS WILL BE CALLED ONCE EXE FINISH */
function onDisconnected() {
port = null;
SendResponse();
}
function SendResponse() {
//create a textarea, focus on it, and make a "paste" command to get the clipboard, then send the pasted value back to the content_script
bg = chrome.extension.getBackgroundPage();
bg.document.body.innerHTML = ""; // clear the background page
var helper = null;
if (helper == null) {
helper = bg.document.createElement("textarea");
helper.style.position = "absolute";
helper.style.border = "none";
document.body.appendChild(helper);
}
//Focus the textarea
helper.select();
// perform a Paste in the selected control, here the textarea
bg.document.execCommand("Paste");
// Send data back to content_script
chrome.tabs.sendMessage(tabId, { action: "EID_DATA", response: helper.value }, function (response) { });
}
ae.eid.chrome.json
{
"name": "ae.eid.chrome",
"description": "chrome extension to read EID",
"path": "EIDSampleConsole.exe",
"type": "stdio",
"allowed_origins": [
"chrome-extension://ifligfijbkpijeafdfbpljjibfbppmeb/"
]
}
install_host.bat
REG ADD "HKCU\Software\Google\Chrome\NativeMessagingHosts\ae.eid.chrome" /ve /t REG_SZ /d "%~dp0ae.eid.chrome.json" /f
I spent 2 days didnot get anything helpful.
Am I doing some error or Google Chrome prevented or changed the way to register host.
I have solved all the issues and posted all the steps at
http://www.codingsips.com/emirates-id-reader-and-google-chrome-via-extension-and-console-app/
Also I have published chrome extension, it you follow above steps the same extension will also work for you
chrome extension
https://chrome.google.com/webstore/detail/adcs-eid-reader/ipcncgpbppgjclagpdlodiiapmggolkf
Edit: Modified code using https://developer.chrome.com/extensions/devtools#evaluated-scripts-to-devtools as reference. Still no luck.
I'm trying to code a chrome-extension which uses chrome.* API call and save portions of the result in a file. I want to automate everything from the loading of the page to the text file download and hence, I don't want to use the browser.onclick() event.
My current attempt has no effect.
What changes would I need to make?
https://stackoverflow.com/a/16720024
Using the above answer as reference, I attempted the following:
manifest.json
{
"name":"Test Extension",
"version":"0.0.1",
"manifest_version": 2,
"description":"Description",
"permissions":["tabs"],
"background": {
"scripts": ["background.js"]
},
"devtools_page": "devtools.html"
}
background.js
// Background page -- background.js
chrome.runtime.onConnect.addListener(function(devToolsConnection) {
// assign the listener function to a variable so we can remove it later
var devToolsListener = function(message, sender, sendResponse) {
// Inject a content script into the identified tab
chrome.tabs.executeScript(message.tabId,
{ file: message.scriptToInject });
}
// add the listener
devToolsConnection.onMessage.addListener(devToolsListener);
devToolsConnection.onDisconnect.addListener(function() {
devToolsConnection.onMessage.removeListener(devToolsListener);
});
}
devtools.js
var backgroundPageConnection = chrome.runtime.connect({
name: "devtools-page"
});
backgroundPageConnection.onMessage.addListener(function (message) {
// Handle responses from the background page, if any
});
chrome.devtools.network.onRequestFinished.addListener(
function(request) {
chrome.runtime.sendMessage({
string: "Hi",
tabId: chrome.devtools.inspectedWindow.tabId,
scriptToInject: "content.js"
});
}
);
chrome.runtime.sendMessage({
string: "Hi",
tabId: chrome.devtools.inspectedWindow.tabId,
scriptToInject: "content.js"
});
content.js
alert("Hello");
I post the code below:
manifest.json
{
"manifest_version": 2,
"name": "Demo",
"description": "all_frames test",
"version": "1.0",
"background": {
"scripts": ["background.js"]
},
"content_scripts": [{
"matches": ["*://*/*"],
"js": ["content.js"],
"all_frames": true
}],
"permissions": [
"tabs",
"*://*/*"
]
}
background.js
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
var tabStatus = changeInfo.status;
if (tabStatus == 'complete') {
function return_msg_callback() {
console.log('Got a msg from cs...')
}
chrome.tabs.sendMessage(tabId, {
text: 'hey_cs'
}, return_msg_callback);
}
});
content.js
/* Listen for messages */
chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse) {
/* If the received message has the expected format... */
if (msg.text && (msg.text == 'hey_cs')) {
console.log('Received a msg from bp...')
sendResponse('hey_bp');
}
});
Then, if I go to a site that includes multiples cross-origin iFrames, e.g., http://www.sport.es/ you would see that all the iFrames within the page receive the message from the background page but only one of them is able to response back. Is this a normal behavior?
Thanks in advance for your answer.
You send just one message with a direct callback so naturally Chrome can use this response callback just one time (it's a one-time connection to one entity, be it a page or an iframe).
Solution 1: send multiple messages to each iframe explicitly:
manifest.json, additional permissions:
"permissions": [
"webNavigation"
],
background.js
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
.............
// before Chrome 49 it was chrome.webNavigation.getAllFrames(tabId, .....
// starting with Chrome 49 tabId is passed inside an object
chrome.webNavigation.getAllFrames({tabId: tabId}, function(details) {
details.forEach(function(frame) {
chrome.tabs.sendMessage(
tabId,
{text: 'hey_cs'},
{frameId: frame.frameId},
function(response) { console.log(response) }
);
});
});
});
Solution 2: rework your background script logic so that the content script is the lead in communication and let it send the message once it's loaded.
content.js
chrome.runtime.sendMessage({text: "hey"}, function(response) {
console.log("Response: ", response);
});
background.js
chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse) {
console.log("Received %o from %o, frame", msg, sender.tab, sender.frameId);
sendResponse("Gotcha!");
});
Communicating between a content script and the background page in a Chrome extension
Content script to background page
Send info to background page
chrome.extension.sendRequest({message: contentScriptMessage});
Receive info from content script
chrome.extension.onRequest.addListener(function(request, sender) {
console.log(request.message);
});
Background page to content script
Send info to content script
chrome.tabs.getSelected(null, function(tab) {
chrome.tabs.sendMessage(tab.id, { message: "TEST" });
});
Receive info from background page
chrome.runtime.onMessage.addListener(function(request, sender) {
console.log(request.message);
});
Instead of messaging, you can use executeScript for your purposes. While the callback's argument is rarely used (and I don't think many know how it works), it's perfect here:
chrome.tabs.executeScript(tabId, {file: "script.js"}, function(results) {
// Whichever is returned by the last executed statement of script.js
// is considered a result.
// "results" is an Array of all results - collected from all frames
})
You can make sure, for instance, that the last executed statement is something like
// script.js
/* ... */
result = { someFrameIdentifier: ..., data: ...};
// Note: you shouldn't do a "return" statement - it'll be an error,
// since it's not a function call. It just needs to evaluate to what you want.
Make sure you make script.js able to execute more than once on the same context.
For a frame identifier, you can devise your own algorithm. Perhaps a URL is enough, perhaps you can use the frame's position in the hierarchy.