Applying options to other scripts in Chrome extension - javascript

I'm writing my first Chrome extension and have hit a brick wall when it comes to setting and using "options." I've used Google's documentation to learn how to set up an options page and have opted to set it as my default popup in the extension.
Here's my manifest for reference:
{
"manifest_version": 2,
"name": "MyExtension",
"description": "MyDescription",
"version": "0.0",
"options_page": "options.html",
"browser_action": {
"default_icon": "on.png",
"default_popup": "options.html",
"default_title": "Manage Tools!"
},
"permissions": [
"storage",
"tabs",
"activeTab",
"https://ajax.googleapis.com/"
],
"content_scripts": [{
"matches": ["specialURL.com*"],
"js": ["jquery-3.1.1.min.js", "content.js"]
}],
"web_accessible_resources": [
"script.js"
],
"background": {
"scripts": ["background.js"]
}
}
My content.js page contains the following:
var s = document.createElement('script');
s.src = chrome.extension.getURL('script.js');
s.onload = function() {
this.remove();
};
(document.head || document.documentElement).appendChild(s);
which loads my script file (script.js). Inside of script.js there are two methods
function foo() { -code- }
function bar() { -code- }
options.js:
function save_options() {
var alltoggle = document.getElementById('alltoggle').checked;
var footoggle = document.getElementById('footoggle').checked;
var bartoggle = document.getElementById('bartoggle').checked;
chrome.storage.sync.set({
allsetting: alltoggle,
foosetting: footoggle,
barsetting: bartoggle
}, function () {
// Update status to let user know options were saved.
var status = document.getElementById('status');
status.textContent = 'Options saved.';
setTimeout(function () {
status.textContent = '';
}, 750);
});
}
// Restores select box and checkbox state using the preferences
// stored in chrome.storage.
function restore_options() {
// Default to true
chrome.storage.sync.get({
allsetting: true,
foosetting: true,
barsetting: true
}, function (items) {
document.getElementById('alltoggle').checked = items.allsetting;
document.getElementById('footoggle').checked = items.foosetting;
document.getElementById('bartoggle').checked = items.barsetting;
});
}
document.addEventListener('DOMContentLoaded', restore_options);
document.getElementById('save').addEventListener('click', save_options);
document.addEventListener('DOMContentLoaded', function () {
document.querySelector('#alltoggle').addEventListener('change', allHandler);
// Turn on/off all features
function allHandler() {
$("input:checkbox").prop('checked', $(this).prop("checked"));
}
});
The problem comes in when I try to load settings back and apply them to my content scripts. Specifically, I can't find how to do that anywhere.

Solved
At first I thought this was a messages issue, but it wasn't. By adding the following to content.js I was able to check storage for my settings and execute code from there.
var fooON;
chrome.storage.sync.get("foosetting", function(result) {
fooON = result.foosetting;
//confirm
console.log(result.foosetting);
});
var barON;
chrome.storage.sync.get("barsetting", function(result) {
barON = result.barsetting;
//confirm
console.log(result.barsetting);
});
Then, by separating foo() and bar() into two scripts I could make the script injection in content.js selective by adding if(fooOn){-inject foo()-} etc.
For others facing similar issues
You can access options saved to storage.sync by using the chrome.storage.sync.get() API call in your content scripts.
var yourSetting;
chrome.storage.sync.get("yourSetting", function(result) {
yourSetting = result.yourSetting;
});

Related

Chrome Extensions - How to run eval code on page load [duplicate]

This question already has answers here:
What is the difference between a function call and function reference?
(6 answers)
Closed 1 year ago.
So I'm trying to make an extension that allows you to write custom JS to be injected on any page for a given domain. My popup loads the saved JS code, and when clicking save, the JS is evaluated, and that works just fine. I can't figure out how to get the code to evaluate on page load, though.
Here is what I have so far.
//Content.js
//Globals
var entries = {"test": "test"}; //Entries dictionary "domain": "js code"
var url = window.location.href; //Full URL of the tab
var parts = url.split("/"); //URL split by '/' character
var domain = parts[2] + ''; //Just the domain (global)
loadChanges();
chrome.runtime.onMessage.addListener(listener);
window.onload=eval(entries[domain]); //doesn't work
function listener (request, sender, sendResponse) {
console.log("Manipulating data for: " + domain);
if (request == "LOAD"){
if(entries.hasOwnProperty(domain)){
console.log("PE - Loaded Value: " + entries[domain].toString());
sendResponse(entries[domain]);
} else {
console.log("Nothing to load");
sendResponse('');
}
} else {
entries[domain] = request;
console.log(entries[domain]);
saveChanges();
eval(request); //This one DOES work
}
}
//Load saved code (on startup)
function loadChanges() {
chrome.storage.local.get(['PE'], function (data){
console.log(data.PE);
if (data.PE == null){
return;
}
entries=data.PE;
});
if(entries.hasOwnProperty(domain)){
eval(entries[domain]); //doesn't work
}
}
//Save changes to code (on button press)
function saveChanges() {
chrome.storage.local.set({PE: entries}, function(data){
console.log("Saved Value: " + entries[domain])
});
}
Note the "doesn't work" comments in there.
manifest.json
{
"name": "PersistEdit",
"version": "0.1.1",
"manifest_version": 2,
"content_scripts":[
{
"matches": ["<all_urls>"],
"js": ["content.js"],
"run_at": "document_end",
"persistent": false
}
],
"background": {
"scripts": [
"background.js"
],
"persistent": false
},
"browser_action": {
"default_popup": "popup.html",
"default_title": "PersistEdit"
},
"permissions": [
"storage"
]
}
document.addEventListener('DOMContentLoaded', onload, false);
function onload(){
chrome.tabs.query({currentWindow: true, active: true}, function (tabs){
chrome.tabs.sendMessage(tabs[0].id, "LOAD");
});
}
Didn't include my popup.html or popup.js because those parts of it work as intended, but I can include them if necessary. I'm not sure what I'm missing here, any guidance would be appreciated.
window.onload is supposed to be a function.
Here window.onload=eval(entries[domain]); you are just assigning the result of eval to onload(which happens immediately during the assignment). It's possible that entries isn't properly populated at that time.
Try the following code
window.onload=function () {
eval(entries[domain]);
}

Detect ajax page changes and add components with DOM (Chrome Extensions, JavaScript)

I'm trying to add DOM elements to the page https://anilist.co/user/diskxo/animelist
var divEntryRow = document.getElementsByClassName("entry row")[x]
var playbutton = document.createElement("DIV");
playbutton.className = "playbutton";
var aInput = document.createElement("A");
var img = document.createElement("IMG");
aInput.appendChild(img);
playbutton.appendChild(aInput);
divEntryRow.appendChild(playbutton);
, but not the whole page is shown on loading, so my extension doesn't
add the elements in some places (play buttons on right)
also, when I move between the tabs of the site, the extension is not reloaded, since updates are made in the background only by ajax. I've been looking for ways to detect changes and reload the extension, including these:
$.ajax({
processData: false,
contentType: false,
success: function() {
doThings();
},
});
Or:
function DOMModificationHandler(){
$(this).unbind('DOMSubtreeModified.event1');
setTimeout(function(){
doThings();
$('#ContentContainer').bind('DOMSubtreeModified.event1',DOMModificationHandler);
},1000);
}
//after document-load
$('#ContentContainer').bind('DOMSubtreeModified.event1',DOMModificationHandler);
I included jquery library in my Extension. This is my manifest.json file:
{
"manifest_version": 2,
"name": "JiyuMe",
"version": "1.0",
"description": "Your next anime streaming website... it's not a streaming website!",
"content_scripts": [{
"matches": ["*://*.anilist.co/*"],
"js": ["js/jquery-3.6.0.min.js", "js/client.js"]
}],
"background": {
"scripts": ["js/background.js"]
},
"browser_action": {
"default_popup": "popup.html"
},
"permissions": [
"*://anilist.co/*",
"nativeMessaging",
"tabs",
"activeTab"
],
"content_security_policy": "script-src 'self' https://apis.google.com; object-src 'self'"
}
Do you have any ideas to understand how to fix this problem?
For the second problem I resolved with a simple function:
//Sleep function
function sleep(ms) {
return new Promise((resolve) => setTimeout(resolve, ms));
}
//Wait for Ajax site load
$.ajax({
processData: false,
contentType: false,
success: async function() {
onPageChange("1");
},
});
async function onPageChange(oldPage_val) {
var currentPage = window.location.href;
if (currentPage != oldPage_val) {
oldPage_val = currentPage;
pageScan();
await sleep(500);
onPageChange(oldPage_val);
} else {
await sleep(500);
onPageChange(oldPage_val);
}
}
I wait for the load of the page, and then I start onPageChange() function, that check every 500 ms if the link of the page changes.
compare the old link with the new one thanks to the variable: oldPage_val

Chrome Extension: How to assign global value from onMessage local scope function

Basically what I am trying to do is send a message from the popup.js by grabbing values from the input fields, and onMessage in the content_script to assign those values from that local scope to the global scope. I can't manage to do it! I can close the whole code in the onMessage function, but then to get to next function of the code I have to keep clicking save on the chrome extension. If someone knows this way better than I do with chrome extensions and what not please review my code and guide me to progress. I have been on this for like a week and my head is about to expload!
I have tried enclosing all the code in the onMessage function in the content_script. I have tried flipping which .js files are sending the message and trying to send the input fields from the extension as a response. I have tried to exclude the sendMessage out of the .click DOM function. Reviewed Messaging API on Google Chrome Extension and im puzzled.
content.js file
chrome.runtime.onMessage.addListener (
function(request) {
item_name = request.name;
item_color = request.color;
item_category = request.category;
item_size = request.size;
console.log(item_name);
console.log(item_color);
console.log(item_category);
console.log(item_size);
});
var url = window.location.href;
var i;
var item_category;
var item_name;
var item_color;
var item_size;
console.log(item_name);
console.log(item_color);
console.log(item_category);
console.log(item_size);
popup.js file
document.getElementById("save_input").onclick = function() {
var item_name_save = document.getElementById("item_name_save").value;
var item_color_save = document.getElementById("item_color_save").value;
var item_category_save = document.getElementById("item_category_save").value;
var item_size_save = document.getElementById("item_size_save").value;
chrome.storage.sync.set({'item_name_save' : item_name_save}, function() {
console.log('Value is set to ' + item_name_save);
});
chrome.storage.sync.set({'item_color_save' : item_color_save}, function() {
console.log('Value is set to ' + item_color_save);
});
chrome.storage.sync.set({'item_category_save' : item_category_save}, function() {
console.log('Value is set to ' + item_category_save);
});
chrome.storage.sync.set({'item_size_save' : item_size_save}, function() {
console.log('Value is set to ' + item_size_save);
});
const msg = { name: item_name_save,
color: item_color_save,
category: item_category_save,
size: item_size_save
};
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
chrome.tabs.sendMessage(tabs[0].id, msg, function() {
});
});
location.reload();
// window.close();
}
manifest.json
{
"manifest_version": 2,
"name": "Supreme bot",
"description": "A bot for Supreme",
"version": "1.0",
"background": {
"scripts": ["background.js"]
},
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html",
"default_title": "Supreme bot"
},
"content_scripts": [
{
"matches": ["http://*/*", "https://*/*"],
"js": ["bot-functionallity.js"]
}
],
"permissions": [
"activeTab",
"tabs",
"storage",
"tabs"
]
}
(When all code is in the onMessage function, works but not as intended)
The Incorrect Functionality
I basically want the content.js to NOT be all inside of the onMessage function because that doesn't work properly, and have it assign values in the global scope from the onMessage function. I just want that info to be sent 1 time from the popup.js to the content.js.
I just set the value with chrome.storage.sync.set and use chrome.storage.sync.get in the other file...

Content Script fails to run when navigating to a new link

I am currently writing a Google chrome extension that needs to run on YouTube videos. I have a content script which is a JavaScript file that does all the work I need it to do.
It is working fine, the only caveat is that for some reason, whenever you click a link to go to a new video, it doesn't run the JavaScript code immediately; you need to reload the page to make it work.
manifest.json
{
"name": "Title",
"description": "description",
"version": "0.5",
"permissions": [
"webNavigation",
"activeTab",
"tabs",
"*://*.youtube.com/*"
],
"browser_action": {
"default_icon": {
"16": "image.png"
},
"default_title": "name",
"default_popup": "popup.html"
},
"content_scripts": [
{
"matches": ["*://*.youtube.com/*"],
"js": ["blocker.js"],
"run_at": "document_end"
}
],
"manifest_version": 2
}
blocker.js
myfunction();
function myfunction(){
//manipulate the HTML DOM
}
myfunction();
function myfunction(){
//manipulate the HTML DOM
}
You can put a time interval to detect that the URL changes
var currentURL = location.href;
setInterval(function() {
if(location.href != currentURL) {
myfunction();
currentURL = location.href
}
}, 100);
but I use this
var currentURL = location.href;
window.onclick=function(){
if(currentURL!==location.href){
myfunction();
currentURL = location.href
/*some code*/
}
}
HTML5 introduces a hashchange event which allows you to register for notifications of url hash changes without polling for them with a timer.
window.onhashchange = function (event) {
console.log(location.hash, event.oldURL, event.newURL);
myfunction();
}

Message Passing is not working in chrome extention

I am try to messaging passing from my Default_popup.js to content script and when it's receive at content script end then try to save data on chrome storage. but my code is not working properly.
This code was worked 2-3 times. but now it's not working.
manifest.json
{
"manifest_version": 2,
"name": "Test",
"description": "Automated Test Tool.",
"version": "1.0",
"browser_action": {
"default_icon": "icon.png",
"default_popup": "Default_Popup.html"
},
"content_scripts": [{
"matches":["http://*/*","https://*/*"],
"js":["myscript.js"] }
],
"background":{
"scripts":["background.js"]
},
"permissions":[
"storage",
"notifications",
"tabs",
"http://*/",
"https://*/"
]
}
Popup.js
chrome.tabs.getSelected(null, function (tab) {
var Jour = {};
Jour.FromStation = $('#txtFromStation').val();
Jour.ToStation = $('#txtToStation').val();
Jour.JourneyDate = $('#datepicker').val();
chrome.tabs.sendRequest(tab.id, { JourneyDetails: Jour }, function handler(response) {
alert("Inside Client = " + "Done");
});
});
myscript.js //Content Script
window.onload = function () {
chrome.extension.onRequest.addListener(
function (request, sender, sendResponse) {
alert('request.JourneyDetails.FromStation');
alert(request.JourneyDetails.FromStation);
var Jour = {};
Jour.FromStation = request.FromStation;
Jour.ToStation = request.ToStation;
Jour.JourneyDate = request.JourneyDate;
chrome.storage.sync.set({ JourneyDetails: Jour }, function () {
console.log('Setting Saved')
});
//sendResponse({ counter2: "5" });
}
);
}
chrome.tabs.getSelected() is deprecated, try using chrome.tabs.query() instead? https://developer.chrome.com/extensions/tabs#method-getSelected
chrome.tabs.sendRequest() and chrome.extension.onRequest() are deprecated, try using chrome.tabs.sendMessage() and chrome.runtime.onMessage() instead? https://developer.chrome.com/extensions/tabs#method-sendRequest, https://developer.chrome.com/extensions/extension#event-onRequest
Do you include jQuery in Default_Popup.html? What are the errors you are seeing?
Are the elements with ids $('#txtFromStation'), $('#txtToStation'), $('#datepicker') in Default_Popup.html? If you could post the content of Default_Popup.html that will be helpful.

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