Forward message to tab

[GMathew]

I am loading an iframe inside background.html page. iframe passes a message to background.js , which then needs to be sent to a tab. 

/* background.js */

window.addEventListener('message', function (e) {

    console.log("We got product! , Pass to tab")

   // This is not sending message to tab

    chrome.tabs.sendMessage(

        currentTabId,

        {

            action: 'message',

            title: "test",

        }, function (response) { }); 

}); 

// in webpage where I receive message , which doesn't get executed 

 window.addEventListener('message', function (e) {

        console.log("We got product on page!");

    }, false);

Is there a different mechanisam to get mssage ? I have checked documents quite few times but I am confused with the worflow.

[Muhammad Qayyum Abro]

In content.js 

chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse)  

{

   if(msg.action == "message")

   {

     //CODE...

   }

});

[GMathew]

To clarify, I have a tab open , in background.js I need to call a function located in that tab. I can do that by injecting code or sending a message from background ?

[PhistucK]

The background page cannot communicate with the tab itself, it has to communicate with code that runs in the world of the extension.

The world of the extension consists of content scripts or scripts that were executed using chrome.tabs.executeScript.

Either way, in order to get the messages, you have to add a listener to onMessage, like Muhammad Qayyum Abro showed.

In order to communicate with the tab itself (from the content script or executed script), you can use the usual postMessage API.

☆PhistucK

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[PhistucK]

Sorry, I might have been wrong.

I wrote this in another thread -

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

On Mon, Jul 24, 2017 at 7:38 PM, PhistucK <phis...@gmail.com> wrote:

The background page cannot communicate with the tab itself, it has to communicate with code that runs in the world of the extension.

The world of the extension consists of content scripts or scripts that were executed using chrome.tabs.executeScript.

Either way, in order to get the messages, you have to add a listener to onMessage, like Muhammad Qayyum Abro showed.

In order to communicate with the tab itself (from the content script or executed script), you can use the usual postMessage API.

☆PhistucK

On Mon, Jul 24, 2017 at 6:24 PM, GMathew <sonesh...@gmail.com> wrote:

To clarify, I have a tab open , in background.js I need to call a function located in that tab. I can do that by injecting code or sending a message from background ?

On Monday, July 24, 2017 at 11:20:03 AM UTC-4, Muhammad Qayyum Abro wrote:

In content.js 

chrome.runtime.onMessage.addListener(function(msg, sender, sendResponse)  

{

   if(msg.action == "message")

   {

     //CODE...

   }

});

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Visit this group at https://groups.google.com/a/chromium.org/group/chromium-extensions/.