javascript - calling parent page function through content script in extension -

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my webpage follows: 

    <body>     <div class="row">                            <button type="button" class="btn btn-primary" id="manual-dial" onclick="dial()";>dial</button>     </div>     </body>    /* dial() function written in js of parent web page */

content.js follows:

    var phone=document.getelementbyid("manual-dial");     phone.addeventlistener("click",dial, false);/*want call dial function of webpage*/    chrome.runtime.sendmessage(/*send response dial() background.js*/);

background.js

  chrome.runtime.onmessage.addlistener(function(response,sender,sendresponse)   { alert(response); });

i want call dial() function of web page extension. how can ?


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