Update Sum

Updates a value based on a selected <option>

by ChrisStanyon

HTML

<select id="values">
  <option value="1">Value 1</option>
  <option value="2">Value 2</option>
  <option value="3">Value 3</option>
  <option value="4">Value 4</option>
</select>

<label for="total">Total:</label>
<input type="text" id="total" value="0">

JavaScript

var runningTotal = 0;

$('#values').change(function() {
	runningTotal += parseInt($(this).val());
	$('#total').val(runningTotal);
});