window.onbeforeunload() called twice!

[rameshfaj]

I have used window.onbeforeunload() to alert user that they will lose the changes if navigate away from the page. But the alert dialog is displayed twice instead of once. What might be the cause and what will be the possible solution for this? can any one help me?

[F1Fan]

Could you show us some code?

[rameshfaj]

Here you can find the portion of the code:

var canExit = <%=formObj.getDealID()==null || "".equals(formObj.getDealID())%>;

var unloadFXFlag = true;

var cancelDealFlag = true;

window.onbeforeunload =checkFXDeal;

function checkFXDeal(){

try{

alert(<%=formObj.getDealID()%>);

}

catch(e){}

if(!canExit && unloadFXFlag)

return "WARNING: You have established an FX deal. Exiting without creating a transaction requires cancellation of the FX deal. Do you wish to continue?";

}

 

The javascript variable canExit is initialized by the attribute of the java object.