firefox webextension messaging from popup script to background script
Question
I have been through the webextension documentation on MDN. I do know the Messaging Api used to communicate from content_script to background script . However, I want to communicate from popup script to background script .
My use case is:
How to communicate to
background scriptfrom a script associated topopup.htmlpage.
Let's say , manifest.json is
{
"description": "Demonstrating toolbar buttons",
"manifest_version": 2,
"name": "button-demo",
"version": "1.0",
"permissions" : ["activeTab","currentWindow"],//
"background": {
"scripts": ["background.js"]
},
"browser_action": {
"browser_style": true,
"default_popup": "popup.html",
"default_icon": {
"16": "icons/page-16.png",
"32": "icons/page-32.png"
}
}
}
background.js
//background script is listening to
browser.runtime.onMessage.addListener((sentMesssage) =>
{
console.log('got the message: ',sentMessage.actualMessage);
});
popup.html is
<html>
<body>
<script src = 'popup.js'></script>
</body>
<html>
popup.js
My question stands here. Which method to use from the below options:
browser.runtime.sendMessage({"actualMessage":"some message"});
OR
var tabQ = browser.tabs.query({
currentWindow: true,
active: true
});
tabQ.then( (tabs)=>{
browser.tabs.sentMessage(tab[0].id , {'actualMessage' : "some message"});
});
2 answers
solution1
0 2017-05-13 04:11:33
My question stands here. Which method to use from the below options:
You use browser.runtime.sendMessage({"actualMessage":"some message"});
solution2
0 2019-08-03 21:08:48
For a popup script (as opposed to content script - the thing you might run in the host tab window) ;
You can just put functions or variables in the background script and call/set/read those from the popup via a ref to the background window object.
background-script.js
let item = null ; //private to background script
function setItem(i){item = i;}
function getItem(){return item;}
var anotherItem ; // publicly available on background window object
var popUpEar ; // if you need to initiate communication from background - set in popup
function talkToPopUp(){
popUpEar("listen to this!") ;
}
then in your popup you can do (using async/Promises)
function earToTheBackground(msg){
console.log(msg);
}
async function f(){
let backgroundWindow = await browser.runtime.getBackgroundPage();
let local_item = backgroundWindow.getItem();
backgroundWindow.setItem("something else");
let local_anotherItem = backgroundWindow.anotherItem ;
backgroundWindow.anotherItem = "something else again";
backgroundWindow.popUpEar = earToTheBackground ;
}
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