Question

I’m trying to add through a jquery event and I’m getting NaN. What am I missing?

   <input type="hidden" id="skillcount" name="skillcount" value="3" onchange="valueadd(this)"/>

   function valueadd(ok){
var value=parseFloat($(this).val())+1;
}

Answer 1

The code should be:

function valueadd(ok){
  // "this" inside here refers to the window
  var value=parseFloat(ok.value)+1;
} 

The inline onchange is actually an anonymous function:

function() {
   //"this" inside here refers to the element
   valueadd(this);
}

So “this” is an argument that gets called “ok” in the valueadd scope. As the others have stated, though, you probably want to use jquery’s bind so “this” inside of valueadd will point to the element.