Send message from js extension to web page

[woodlu...@gmail.com]

How can i send message from js chrome extension to web page.
I run js function chrome extension from web page like this:

//web page js
 var idChrom = "gahebcgahkecemndaolcneonffnfedfc";
chrome.runtime.sendMessage(idChrom , {Funkcja :"WybierzPlik"});

Function run dll and return result .

backgrund.js chrome extension :

chrome.runtime.onMessageExternal.addListener(
  function(request, sender, sendResponse) {
    // don't allow this web page access
   if(request.Funkcja == "WybierzPlik")
   {
       var tmp = "";
     chrome.runtime.sendNativeMessage('com.zeto.eldok',{ Funkcja: "WybierzPlik" } ,
     function(response)
     {
            tmp = response.Return;
            var data = { type: "TO_PAGE",Return: tmp };
            window.postMessage(data, "*");
     });
   }

tmp = response.Return; is result.

Now i want to send back this tmp value to the same web page . How can i do this?
I try tu use window.postMessage and 

window.addEventListener( "message", function(event)
{
    var x = event.data.type;
 });

No result.

[PhistucK]

You cannot use the standard web message mechanism to communicate between a background page and a web page.

See https://developer.chrome.com/extensions/manifest/externally_connectable.html for this.

☆PhistucK

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[woodlu...@gmail.com]

Thanks.
How should use externally_connectable to do it?
Could you give my any example?

☆PhistucK

[PhistucK]

That page has a link to this page with examples -

https://developer.chrome.com/extensions/messaging#external-webpage

☆PhistucK

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[woodlu...@gmail.com]

This communication work only one way from web page my app to chrome extension .

in chrom extension i have :

tmp = response.Return;
chrome.runtime.sendMessage({Return: tmp}); // send message to web page

i dont have id app. Mayby i shoude send message another way.

in my web page :

  var port = chrome.runtime.connect(idChrom); // id extension
                port.postMessage({Funkcja :"WybierzPlik"});
                port.onMessage.addListener(function(msg) {

                    var tmp = msg.Return;
                });

When i send 'WybierzPlik' message its work fine. But now i have to send from extension to my web page. unfortunately 'addListener' don't start.

[PhistucK]

You are right, you will need a content script or use executeScript for that, I guess.

☆PhistucK

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[woodlu...@gmail.com]

How send message from chrome extension to web page?

[PhistucK]

I just wrote it (send a message to a content script/executeScript). You can read the documentation for that at https://developer.chrome.com/extensions.

This thread might also help -

https://groups.google.com/a/chromium.org/d/msgid/chromium-extensions/503d7e85-49f5-4682-a77a-fcf29b8981d1%40chromium.org?utm_medium=email&utm_source=footer

☆PhistucK

On Fri, Jul 28, 2017 at 11:24 AM, <woodlu...@gmail.com> wrote:

How send message from chrome extension to web page?

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