Develop Reference

Chrome extension not detecting input field

I'm creating my first Chrome extension and the code just seems to not be working. Basically for now, I want the extension to be able to identify a click on an input field and give an alert. I think the extension is not recognizing the click. I've tried multiple things, but here's the most recent code:
manifest.json
{
"name": "Pi",
"version": "1.0",
"description": "Pi works!",
"permissions": ["activeTab", "declarativeContent", "storage"],
"browser_action": {
"default_icon": {
"32": "pie.png"
}
},
"background": {
"scripts": ["background.js"],
"persistent": false
},
"content_scripts": [{
"matches": ["<all_urls>"],
"js": ["contentScript.js"]
}],
"manifest_version": 2
}
background.js
chrome.browserAction.onClicked.addListener(function(tab) {
alert('HELLO WORLD!!');
});
contentScript.js
document.addEventListener('DOMContentLoaded', function(){
document.getElementsByTagName('input').addEventListener("click", function (){
alert("Hi");
});
});

Remove document.addEventListener('DOMContentLoaded', function(){ You actually don't need it. The chrome Browser will decide when to run content script based on run_at settings in the manifest.json default is document_idle. See more here.
GodsArchitect's example is correct for detecting the click event of INPUT tags. However, you may need to consider onFocus event on INPUT tags in case if users use keyboard TAB key to focus into the input field.
const inputTags = Array.from(document.querySelectorAll('input'))
inputTags.forEach(function (input) {
input.addEventListener('focus', function (event) {
alert("Hi...")
}, false)
})

The following does the job.
document.addEventListener('click', function(e) {
e = e || window.event;
var target = e.target || e.srcElement;
if(target.tagName == 'INPUT'){
alert('You clicked an Input!');
}
}, false);
Source: https://stackoverflow.com/a/9012576/10383955

Running chrome extension process while popup is closed

Basically I am trying to create an Auto Visitor Extension for Chrome to open a website's URL after some specific time. When I open the popup everything works fine but when the popup is close nothing works. I am trying to find out a method to run that Auto Visitor Extension even when the popup is close I have read multiple questions regarding this phenomena on Stack Overflow but none of them clarifies what I am looking for.
Here is my manifest file:
manifest.json
{
"manifest_version": 2,
"name": "Auto Visitor",
"description": "This extension will visit multiple pages you saved in extension",
"version": "1.0",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"background": {
"scripts": [
"background.js"
],
"persistent": false
},
"permissions": [
"activeTab",
"storage",
"tabs",
"http://*/",
"https://*/"
]
}
The background file that i want to run even when popup is close :
background.js
// this will work only when you denie the background script in manifest
chrome.runtime.onInstalled.addListener(function(details) {
var initTime = 5;
chrome.storage.local.set({"avtime": initTime}, function() {});
});
reloadMainTab();
function reloadMainTab() {
chrome.storage.local.get('avurl', function (result) {
var urlsToLoad = result.avurl;
console.log(urlsToLoad);
if(urlsToLoad==undefined){
// do nothing
}else{
var urlsArr = urlsToLoad.split(",");
chrome.storage.local.get('avtime', function (result) {
var thisTime = result.avtime;
/*
setting it to -1 because it gets incremented by 1
when it goes into getSelected method
*/
var index=-1;
setInterval(function(){
if(index < urlsArr.length-1){
chrome.tabs.getSelected(function (tab) {
// console.log('index in get selected'+index)
chrome.tabs.update(tab.id,{url: urlsArr[index]});
});
index++;
}else{
index=-1;
}
}, thisTime+"000");
});
}
});
}
any help would be really appreciated

How to Access / Read any Text / Tag Value from the Webpage using Chrome Extension

I am writing my First Chrome Plugin and I just want to get some text present on the current webpage and show it as a alert when i click the Extension. Lets say I am using any any webpage on www.google.com after some Search query, Google shows something like "About 1,21,00,00,000 results (0.39 seconds) " . I want to show this Text as an alert when i execute my plugin. This is what i am doing.
here is the manifest.json that i am using
{
"manifest_version": 2,
"name": "Getting started example",
"description": "This extension shows a Google Image search result for the current page",
"version": "1.0",
"background": {
"persistent": false,
"scripts": ["background.js"]
},
"content_scripts": [{
"matches": ["*://*.google.com/*"],
"js": ["content.js"]
}],
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"permissions": [
"activeTab"
]
}
Here is my popup.js
document.addEventListener('DOMContentLoaded', function() {
document.getElementById("checkPage").addEventListener("click", handler);
});`
function handler() {
var a = document.getElementById("resultStats");
alert(a.innerText); // or alert(a.innerHTML);
}
Here is my content.js
// Listen for messages
chrome.runtime.onMessage.addListener(function (msg, sender, sendResponse) {
// If the received message has the expected format...
if (msg.text === 'report_back') {
// Call the specified callback, passing
// the web-page's DOM content as argument
sendResponse(document.all[0].outerHTML);
}
});
Here is my background.js
var urlRegex = /^https?:\/\/(?:[^./?#]+\.)?google\.com/;
// A function to use as callback
function doStuffWithDom(domContent) {
console.log('I received the following DOM content:\n' + domContent);
}
// When the browser-action button is clicked...
chrome.browserAction.onClicked.addListener(function (tab) {
// ...check the URL of the active tab against our pattern and...
if (urlRegex.test(tab.url)) {
// ...if it matches, send a message specifying a callback too
chrome.tabs.sendMessage(tab.id, {text: 'report_back'}, doStuffWithDom);
}
});

1) run content scrip after document ready ** check "run_at"
"content_scripts": [{
"run_at": "document_idle",
"matches"["*://*.google.com/*"],
"js": ["content.js"]
}],
2) on click of extension make another js to run( popup js). The popup js has access to the ( open page document)
// A function to use as callback
function doStuffWithDom() {
//console.log('I received the following DOM content:\n' + domContent);
//get tabID when browser action clicked # tabId = tab.id
chrome.tabs.executeScript(tabId, {file: "js/popup.js"});
}
3) In popup JS simple you can set alert
var a = document.getElementById("resultStats");
alert(a.innerText); // or alert(a.innerHTML);

Just remove "default_popup" part in manifest.json, as you have listened to chrome.browserAction.onClicked event in background page. They can't live at the same time.

Running a function in chrome extension on double click/select of a word

I am trying to fire a notification whenever I double click on a word/select it. Found several examples online but I still cannot get my example working:
Manifest:
{
"name": "hh",
"description": "hh!",
"manifest_version": 2,
"version": "0.0.0.1",
"content_scripts": [
{
"matches": [ "http://*/*", "https://*/*" ],
"js": [ "background.js" ],
"all_frames": true,
"run_at": "document_end"
}
],
"permissions": ["storage", "notifications"],
"icons": { "128": "neoprice.png" }
}
background.js
var listener = function(evt) {
var selection = window.getSelection();
if (selection.rangeCount > 0) {
displayPrice();
var range = selection.getRangeAt(0);
var text = range.cloneContents().textContent;
console.log(text);
}
};
document.addEventListener('dblclick', listener);
function displayPrice(){
chrome.notifications.create(getNotificationId(), {
title: "message.data.name",
iconUrl: 'hh.png',
type: 'basic',
message: "message.data.prompt"
}, function() {});
}
// Returns a new notification ID used in the notification.
function getNotificationId() {
var id = Math.floor(Math.random() * 9007199254740992) + 1;
return id.toString();
}
I was earlier adding the following but I saw people weren't using it, so I removed it
"app": {
"background": {
"scripts": ["background.js", "assets/jquery.min.js"]
}
},
What I am trying to achieve: Whenever they go to ANY page on selecting a word, it fires the function. Later, I wish to use this for a specific page. :)
Tried: How to keep the eventlistener real time for chrome extensions?
Chrome extension double click on a word
https://github.com/max99x/inline-search-chrome-ext
Both don't really work as I want them too. :(

Solution
It seems you are confused with background page and content script. Your background.js is a content script in fact, though its name is "background". While chrome.notifications api can be only called in background page, trying commenting displayPrice function will make your code work.
Next step
Take a look at above tutorials, wdblclick event triggers, use Message Passing to communicate with background page and call chrome.notications api in background page.
What's more
The following code is used in chrome apps rather than chrome extension.
"app": {
"background": {
"scripts": ["background.js", "assets/jquery.min.js"]
}
},

Javascript DOM Chrome Extension simple Script

I made an Extension for Firefox that random check all radio buttons & checkboxes on a website. Now I will make it for Chrome.
JS (inject.js):
function randomFromTo(from, to){
return Math.floor(Math.random() * (to - from + 1) + from);
}
function autoFill () {
for (i = 0; i < document.forms.length ;i++) {
for (j = 0; j < document.forms[i].length ;j++) {
if (document.forms[i].elements[j].type == "radio") {
start = j;
lastName = document.forms[i].elements[j].name;
while (j < document.forms[i].length - 1 && lastName == document.forms[i].elements[j+1].name) {
j++;
}
rand = randomFromTo(start, j);
document.forms[i].elements[rand].checked = true;
}
if (document.forms[i].elements[j].type == "checkbox") {
start = j;
lastName = document.forms[i].elements[j].name;
while (j < document.forms[i].length - 1 && lastName == document.forms[i].elements[j+1].name) {
j++;
}
rand = randomFromTo(start, j);
document.forms[i].elements[rand].checked = true;
}
}
}
}
autoFill();
So I read a lot about inject.js and Content Scripts so I tried both. And made it like this.
{
"name": "Auto Check Radio \u0026 Checkbox",
"version": "0.0.1",
"manifest_version": 2,
"description": "",
"homepage_url": "",
"icons": {
"16": "icons/icon16.png",
"48": "icons/icon48.png",
"128": "icons/icon128.png"
},
"default_locale": "en",
"background": {
"page": "src/bg/background.html",
"persistent": true
},
"browser_action": {
"default_icon": "icons/icon16.png",
"default_title": "Autocheck",
"default_popup": "src/browser_action/browser_action.html"
},
"permissions": [
"tabs",
"notifications",
"http://*/",
"http://*/*",
"https://*/*"
],
"content_scripts": [{
"matches": ["https://*/*", "http://*/*"],
"js": ["src/inject/inject.js"],
"run_at": "document_end"
}],
"web_accessible_resources": ["src/inject/inject.js"],
"js": ["src/inject/inject.js"]
}
]
}
But I've got no idea how I can run the code. On Firefox it is much easier.
I don't need any background.html or browser_action.html
I only want to run the script - in the current tab - by clicking the icon.
Chould anyone give me a tip where i place my script?

Please read the Overview document first. Especially the Architecture part.
Any code that interacts with the page DOM must be in a Content Script. You've already put the code in src/inject.js.
Now, you don't need any UI to pop up when you click the button, so drop the "default_popup" item from the manifest and its HTML.
You also don't want your code to randomly execute when a tab loads. That's what "content_scripts" section in the manifest is about, so simply delete it.
Finally, you don't need a background HTML file. They have been replaced by autogenerated pages that are built from a list of scripts. So:
"background": {
"scripts": ["src/bg/background.js"]
},
"browser_action": {
"default_icon": "icons/icon16.png",
"default_title": "Autocheck"
},
Now, the only job of the background script is to register a handler for the button click. This is done through browserAction API:
// src/bg/background.js
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.executeScript(tab.id, {file: "src/inject/inject.js"});
});
That's it, at this point it should work.
Now, to trim down the fat.
You don't need a persistent background page, since all it does is keeping simple event listeners that don't save any kind of state information. You can safely add "persistent": false to the manifest.
Your permissions are a massive overkill. There's a handy activeTab permission that gives you access to the current page if your code is invoked by, say, browser action button press.
In fact, that is the only permission your code needs. It will take care of executeScript call.
"permissions" : ["activeTab"],