Detect if a Chrome extension is installed by users

Question

I tried all solutions in this question

Check whether user has a Chrome extension installed

what I did:

1- I added background js file and in manifest I added the following

 "background": { "scripts": ["js/background.js"], "persistent": true }, "permissions": [ "https://*.mydomain.com/*" ],

in background.js I added

chrome.runtime.onMessageExternal.addListener(function(msg, sender, sendResponse) { if ((msg.action == "id") && (msg.value == id)) { sendResponse({id : id}); } });

and in my website I added this code

<script> var id = "madbfblbpcoiddlankhkdbagjeemnlof"; chrome.runtime.sendMessage(id, {action: "id", value : id}, function(response) { if(response && (response.id == id)) //extension installed { console.log(response); } else //extension not installed { console.log("Please consider installig extension"); } }); </script>

and I always get Please consider installig extension

How can I fix this issue ??

Luka Čelebić · Accepted Answer · 2018-05-13 02:08:34Z

Define your id at the start of your background.js like so: var id = chrome.runtime.id;.

Also you need to add your site to the externally_connectable instead of the permissions in the manifest.json as:

"externally_connectable": { "matches": ["https://*.mydomain.com/*"] }

It worked like a charm I didn't know about externally_connectable . thank you for your help you saved me

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