从chrome扩展程序向chrome应用发送消息

Question

I am developing a test app for chrome.

I also am developing an extension, which should get tab url and send a message to the app with the url of the tab, where the extension was activated.

In the extension I have this background.js

chrome.browserAction.onClicked.addListener(function(tab) {
    alert(tab.url);
});

the tab.url info is correct, I need to send to the app, (which also is in javascript).

I have read many examples on internet, but there is something I'm not getting. How should I post the message, and how to listen on the app for that message?

Answer 1

Messaging docs have a clear example .

Extension code:

chrome.browserAction.onClicked.addListener(function(tab) {
    chrome.runtime.sendMessage("appIdHere", {tabUrl: tab.url});
});

App code:

chrome.runtime.onMessageExternal.addListener(
    function(message, sender, sendResponse) {
        // Check the ID! Requests may be spoofed.
        if(sender.id == "extensionIdHere" && message.tabUrl) {
            doStuff(message.tabUrl);
        }
    }
}