i want to have a form whereby i can add a value into the first text field, multiply that by a second hidden field, and display results in a 3rd text field. I want it so as soon as you add a value to the first field it shows the result in the 3rd field, eg on key up.
<label>Qty:</label>
<input name="qty" id="qty" type="text" />
<input name="price" id="price" type="hidden" value="30" /><br />
<label>Total:</label>
<input name="total" id="total" type="text" />
Any help would be great as im new to jquery.
Though you got the answer but you should type cast the values you type in inputs. I mean what if someone type any other value other than integer... then you will get NaN in 3rd textbox..Here is solution to handle this problem
or you can check jsfiddle http://jsfiddle.net/ugPxf/
This should work.
R.