event.target not working on Firefox

 var x = event.target||event.srcElement;
 document.getElementById(x.id).style.left =  200 + "px" ;
 document.getElementById(x.id).style.top  =  100 + "px" ;

Works fine on google chrome and IE but not on firefox. Tried it on google. google says event.srcElement(works on IE but not on firefox) so i have added event.target but still not working. Is there anymore changes I need to do to work on firefox? By the way Im using 3.5 version of firefox.

       function up()
           {
                dragok = false;
                document.onmousemove = null;
                var x = event.target||event.srcElement;
                document.getElementById(x.id).style.left= 200 + "px" ;
                document.getElementById(x.id).style.top= 100 + "px" ;
           } 

Please help me to make it work on firefox

Answers:

Answer

Make sure you define event as a formal parameter to the handler.

IE defines it globally, and Chrome defines it both in both places, so it works either way, but Firefox only defines it as a function parameter.

function up( e ) {
    //       ^-----------------------------------------------------+
    if( !e ) e = window.event; // <---needed this --- and this ->--+

    dragok = false;
    document.onmousemove = null;
    var x = e.target||e.srcElement; // <--- and these
    document.getElementById(x.id).style.left= 200 + "px" ;
    document.getElementById(x.id).style.top= 100 + "px" ;
} 
Answer

This solution to work in Firefox browser too. When start keydown action then its set the event property to global variable like this.

 var keyEvent=null; 

Assign that event property to keyEvent and .item is target element.

  $(document).on("keydown",'.item', function(e){ 

                keyEvent=e;                                    

        },this))

then.Use keyEvent in your code.

     function up( e ) {
           if( !e ) e = keyEvent;  
             dragok = false;
             document.onmousemove = null;
             var x = e.target||e.srcElement; 
             document.getElementById(x.id).style.left= 200 + "px" ;
             document.getElementById(x.id).style.top= 100 + "px" ;
         }

Note: Don't try to set the event property to global variable of window.

Answer

I solved my problem using Jquery. For example to get the id of a element you can use:

var x = $(this).attr('id');

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