消息未在内容广告背景脚本文件之间传递

Question

I am trying to send message from background.js to contentscript file, script.js . Below is code

script.js

chrome.runtime.onMessage.addListener(function (msg, sender, sendResponse) {
//    alert('Message from View:\n'
//          + JSON.stringify(msg));
    alert(msg);
    if (msg.method === 'sendHTML')
    {
        //process the return code

        sendResponse({ data: "Your DOM is here"});
    }
});

background.js

chrome.browserAction.onClicked.addListener(function (tab)
{
//    var url = tab.url.toLowerCase();
//    if(url.indexOf("middlecoin") == -1)
//        alert("You are not on MiddleCoin Page");
//    else
//        chrome.tabs.create({ url: loaderURL + tab.id });
    alert("Clicked Call");
    chrome.runtime.sendMessage({method: "sendHTML"}, function(response) {
      alert(response.data);
    });

});

the alert response.data) is not being called. Where am I doing wrong?

Let me tell there is NO html file is being in entire extension

Answer 1

You need to use chrome.tabs.sendMessage instead of chrome.runtime.sendMessage to send a message from background page to content script. To send a message to the current tab, you can use the tab object passed to your listener for browserAction.onClicked :

chrome.browserAction.onClicked.addListener(function (tab) {
  chrome.tabs.sendMessage(tab.id, {method: "sendHTML"}, function(response) {
    alert(response.data);
  });
});