jquery is not refreshing the function

I have a jquery function that suppose to delete last dynamic created div it delete first time but when I try to delete again it's giving me

Microsoft JScript runtime error: 'null' is null or not an object

<script type="text/javascript">
  jQuery("btnDeleteALineButton").click(function(e){
    var lineCount = GetServiceLineCount();
    if(lineCount > 0 ){
      $('ctrlServiceLine'+lineCount).remove();
      lineCount = lineCount -1;
    }
    //e.preventDefault()
  });
</script>

When I put alert I see that firt time give开发者_Go百科 lineCount correct but never do -1

can some one please help me

Your button selector is incorrect. If you are targeting id, change ("btnDeleteALineButton") to ("#btnDeleteALineButton"). For class use (".btnDeleteALineButton")

The same applies for the second selector.

Linecount is just a local variable inside the function. GetServiceLineCount() is always returning the same number.

Try to put var lineCount = GetServiceLineCount(); into jquery initialization so that lineCount becomes global variable