javascript - Cancel default onbefoarunload pop up message inside method -


i have following code, question that, there way can cancel onbeforeunload custom pop inside method call? in case of firefox want show own custom message , if user pressed cancel dont want show default message.

<!doctype html> <html> <head> <script type="text/javascript"> var clicked = false;  function copytext() {     var span = document.getelementbyid('sp');     if(clicked == false)     {            clicked = true;         span.appendchild( document.createtextnode("clicked") );     }     else     {         clicked = false;         span.removechild( span.firstchild );     } }    window.onbeforeunload = function () {   if(clicked == true) return ;   else  { if(navigator.useragent.indexof("firefox")!=-1) {  if(confirm("are sure want close window without submitting documents?")){           self.close();           return; // want not call custom pop here      } }     return "are sure want close window without submitting documents?";  } }; //}    </script> </head> <!--<body onunload="confirmme()>--> <body>  <button onclick="copytext()">click!</button> <br> <span style="color:lightblue" id="sp"></span>    </body> </html>

there's no way can cancel onbeforunload event inside function. following show default popup if user doesn't want close page, happens in firefox if user wants stay on page.

window.onbeforeunload = function () {   if(clicked == false)  {     if(navigator.useragent.indexof("firefox")!=-1)     {          if(confirm("are sure want close window without submitting documents ?")){                 self.close();                    return;            }      }    return "are sure want close window without submitting documents?"; }  };

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