Sorry for my poor English, i hope you can understand the issue.
I'm new to chrome extension development,and for sure in my code there are a lot of thing to change or optimize; anyway i've written a simple code that, (seems) works at least from my chrome.
The code clicks a button every X minutes in specific page, then wait and parse the result in page.
I've :
a content script (loaded from manifest.json) which "inject" some button and text Input box in page, so user can sets some "filter params" before click a "start button"; the start button then sendMessage() to background.js to set Alarm Event for the click ;
an eventPage (which is set persistent true in actually ) which handle the request from tabs and set a countdown alarm for each tab; when X min are passed fire a message to the interested tab;
I also have a popup.html e popup.js not important here (i think).
I've to distribuite this extension manually, so i would distribuite a zip that user can load with "developer mode ".
*Now the issue is: why the code was working only on my Chrome ? *
I've tested with others 2-3 laptop with Chrome, the background script is loaded (i can see the background page printint console log)
but in webpage the contents.js seems no way executed .
In my chrome works well: i can see in console some initial output (i print the name of dir extension to check) and the dynamic created element (button,input box ect.) in page.
And all is working, i can fire the start button and receive results of parsing.
During the development i've never run the extension on other machine. Yesterday i've succssfully tested on 2-3 laptop.. then i made only few change but nothing serious.
Today i can run only in my chrome.
In other pc nothing, neither the simple console.log output first line of script.
I can read in console log : "Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist." but this also in my working istance in my laptop chrome .
The zip file is the same and the extraction is good, in fact i can actually load the extension and i see the background page debug console.log() sentences
In some case, in laptop where it dosen't work, i've received a message relative jQuery and the fact that chrome.runtime.sendMessage() is not defined; and it points to code in webpage, not mine.
I've see that in webpage code there is something like:
var extid = "mcmhdskbnejjjdjsdkksmeadjaibo";
var extVer = "1.5";
var extStatus = 0;
$(document).ready(function () {
///...
chrome.runtime.sendMessage(extid, {message: "version"},
function (reply) {
if (reply) {
if (reply.version) {
if (reply.version == extVer) {
if (reply.gminfo != 'OK') {
extStatus = 1; /// ...
Seems that chrome.runtime is undefined, and the webpage can't call the sendMessage(). EDIT: this undefined occurs only when my extension is loaded
Maybe there is some conflict when i load my extension? But in my chrome browser works...
Can some expert indicate in where direction i've to investigate?
Thanks a lot for any suggestions.
My Manifest.json :
{"manifest_version": 2,
"name": "myAlarm",
"description": "This extension alerts.",
"version": "0.1",
"permissions": [
"alarms",
"system.cpu",
"storage",
"tabs",
"webNavigation",
"https://www.mytargetsite.com/subUrl/"
],
"web_accessible_resources": [
"icon.png",
"vanillaSelectBox.css"],
"content_scripts": [
{
"matches": ["https://www.mytargetsite.com/subUrl/"],
"css": ["vanillaSelectBox.css"],
"js": ["jquery-3.3.1.min.js","vanillaSelectBox.js","taffy-min.js","content.js"],
"run_at": "document_end"
}
],
"background": {
"scripts": ["eventPage.js"],
"persistent": true
},
"browser_action": {
"default_icon": "icon.png",
"default_popup": "popup.html"
},
"icons": {
....
}
}
My contents,js (stripped):
chrome.runtime.onMessage.addListener(
function(request, sender) {
// here i parse message "time'up" from background js
});
window.addEventListener('load', function() {
var pt=chrome.runtime.getURL('filterOff.wav');
var p=pt.split("/");
console.log("[myAlarm v0.1] started" );
console.log("[myAlarm v0.1] folder : ("+p[2]+")");
// here i start an active wait for the presence in page of button with ID= btntarget_id
waitForElementToDisplay("#btntarget_id", 500); //when function find button then create and add button and input text to webpage
});
My eventPage.js :
var curr_alarms =[];
chrome.extension.onMessage.addListener(function(request, sender)
{ /// here receive start countdown message from content.js and set alarm ...
}
chrome.alarms.onAlarm.addListener(function(alarm) {
/// here i manage each alarm for each tab
});
chrome.tabs.onRemoved.addListener(function(tabid, removed) {
// ...
});
chrome.tabs.onUpdated.addListener(function
(tabId, changeInfo, tab) {
//
});
edit : in browser where it dosen't work i can read also :
Access to XMLHttpRequest at 'https://mytargetsite.com/suburl/grid.php' (redirected from 'https://mytargetsite.com/suburl/grid.php') from origin 'https://mytargetsite.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.
