CODEWITHSUNDEEP
google-chrome-extension
user3501676
user3501676

Reputation: 487

Sending message from popup to content script - Chrome Extension

I want to update the html in popup.html when I open it through the browser action button. The popup.js should send a message to the content script running on the current tab, and should receive a response and update the html. However the content script does not receive any message, therefore not sending a proper response.

Content.js

var text = "hello";
chrome.runtime.onMessage.addListener(
    function(message, sender, sendResponse) {
        switch(message.type) {
            case "getText":
                sendResponse(text);
            break;
        }
    }
);

Popup.js

chrome.tabs.getCurrent(function(tab){
    chrome.tabs.sendMessage(tab.id, {type:"getText"}, function(response){
        alert(response)
        $("#text").text(response);
    });
});

Manifest.json

{
  "manifest_version": 2,
  "name": "It's Just A Name",
  "description": "This extension is able to",
  "version": "1.0",
  "permissions" : ["tabs"],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click here!"
  },
  "content_scripts": [
  {
    "matches": ["https://*/*"],
    "js": ["jquery.min.js","content.js"]
  }]
}

Popup.html

<!doctype html>
<html>
    <head>
        <title>Title</title>
        <style>
            body {
                font-family: "Segoe UI", "Lucida Grande", Tahoma, sans-serif;
                font-size: 100%;
            }
            #status {
                white-space: pre;
                text-overflow: ellipsis;
                overflow: hidden;
                max-width: 400px;
            }
        </style>
        <script src="popup.js"></script>
    </head>
    <body>
        <p id="text"></p>
    </body>
</html>

Upvotes: 32

Views: 28647

Answers (3)

Ambuj sahu
Ambuj sahu

Reputation: 78

As per the latest docs you can also try the following:

popup:


(async () => {
  const [tab] = await chrome.tabs.query({active: true, lastFocusedWindow: true});
  const response = await chrome.tabs.sendMessage(tab.id, {greeting: "hello"});
  // do something with response here, not outside the function
  console.log(response);
})();

content_script:

chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {
    console.log(sender.tab ?
                "from a content script:" + sender.tab.url :
                "from the extension");
    if (request.greeting === "hello")
      sendResponse({farewell: "goodbye"});
  }
);

Message passing docs!

Upvotes: 1

kofifus
kofifus

Reputation: 19315

To add to above answer, You often want to send a msg from a popup to all tabs, so

popup:

chrome.tabs.query({}, tabs => {
    tabs.forEach(tab => {
    chrome.tabs.sendMessage(tab.id, msgObj);
  });
});

content script:

chrome.runtime.onMessage.addListener(msgObj => {
    // do something with msgObj
});

Upvotes: 13

Denis L
Denis L

Reputation: 3302

chrome.tabs.getCurrent uses for:

Gets the tab that this script call is being made from

Your popup.js should be: 

chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
    chrome.tabs.sendMessage(tabs[0].id, {type:"getText"}, function(response){
        alert(response)
        $("#text").text(response);
    });
});

Upvotes: 32

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