c# - Invoke Javascript method from code-behind based on a condition. -

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this javascript method in .aspx file. want invoke method code-behind based on condition:

function confirmboxandhidemessage() {     //hidemessage();     var response = confirm("are sure?.");     if (response == true) {         document.getelementbyid("<%=chkvalidated.clientid%>").checked = true;         hidemessage();     }     else {         hidemessage();         return true;     } }

the condition upon want invoke this:

        if (obj.fkvalidationstatusid.hasvalue && obj.fkvalidationstatusid.value.equals(1))         {             btnproceedaddnewrecords.attributes.add("onclick", "javascript:return confirmboxandhidemessage();");           }         else         {             btnproceedaddnewrecords.attributes.remove("onclick");         }

this condition being exercised in method called in pageload event inside 

if (!ispostback) { /* condition */ }

it not working , guess way adding method in button attribute wrong. request that, kindly suggest way can invoke javascript method code-behind based on stated condition. if think approach flawed, please suggest alternatives. thanks.

use set/unset onclientclick 

if (obj.fkvalidationstatusid.hasvalue && obj.fkvalidationstatusid.value.equals(1))   {      btnproceedaddnewrecords.onclientclick="return confirmboxandhidemessage();";     } else   {      btnproceedaddnewrecords.onclientclick="retun false;";   }

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