Adding 1 to form field with button

**johnhjohn** · Mar 26 '08, 09:14 PM

Here is an example that will add or subtract one:

Code:

<html>
<head>

<script language="javascript" type="text/javascript">
 var current;
 function add_subtract(numb)
 {
   current = parseInt(document.getElementById("number").value);	// gets value from text  (parseInt gets first occurrence of a number from text)
   current+=numb;	// adds variable numb to current
   document.getElementById("number").value = current;	// puts new value into text
 }
</script>

</head>
<body>
<input type="text" id="number" value="0">
<input type="button" value="Add One" onclick="add_subtract(1)">
<input type="button" value="Subtract One" onclick="add_subtract(-1)">

</body>
</html>

I hope I helped.

Adding 1 to form field with button

Adding 1 to form field with button

Comment