javascript - Message passing by chrome.runtime.sendMessage()? -

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i refered chrome documentation https://developer.chrome.com/apps/runtime#type-messagesender https://developer.chrome.com/apps/runtime#event-onmessage

in sample chrome extension, pass number contentscript.js popup.js:

contentscript.js:

var fromdom = 100; chrome.runtime.sendmessage({fromdom});//here i'm passing value in fromdom

popup.js:

chrome.runtime.onmessage.addlistener(function(response){    number = response; //here i'm assigning value in response total    document.getelementbyid("output").innerhtml=number;//manipulating element                                                     // in popup.html } );

the element "output" isn't getting modified.

so, doing right? how should "any message" parameter in general , can use parameter way?

updated contenscript.js , background.js:

contenscript.js:

//code values table in results page var table = document.getelementsbyclassname("collapse")[0];  var marks = new array();   for(var i=0;i<8;i++)    marks[i] = table.children[0].children[i+1].children[5].innerhtml;   var total=0;  for(var i=0;i<8;i++)    total += number(marks[i]);   var fromdom = total; chrome.runtime.sendmessage(fromdom);

background.js:

//code display pageaction button on domain results.griet.in chrome.runtime.oninstalled.addlistener(function() {     chrome.declarativecontent.onpagechanged.removerules(undefined, function() {         chrome.declarativecontent.onpagechanged.addrules([{             conditions: [                 new chrome.declarativecontent.pagestatematcher({                     pageurl: {                         hostsuffix:<website>                     }                 })             ],             actions: [new chrome.declarativecontent.showpageaction()]         }]);     }); });  //code inject contentscript. chrome.tabs.executescript({"file": "contentscript.js"});


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