Adding Form Field Values Together

[sjf]

Hi, I am a complete newbie to Javascript so this may be a very bad question .....

I want to add / minus / multiply / divide two values entered into a form and display an answer to the screen once a "Calculate" button has been pressed without submitting the form the values are being entered in .... any suggestions?
sjf

 

[GIGN]

The values are entered as Strings, so first you'll need to convert them to numbers. like:

var number = parseFloat("1234.54"

or you can parse to Integers using parseInt(). These will be converted back to strings for you when you put them back in the form.

<script>
function upDate(form){
var result = form.result;
var item_1 = parseFloat(form.txt_1.value);
var item_2 = parseFloat(form.txt_2.value);
// Do your thing with the numbers
result.value = item_1 + item_2;
}
</script>

<FORM>
<input type=&quot;text&quot; name=&quot;txt_1&quot;>
<input type=&quot;text&quot; name=&quot;txt_2&quot;>
<input type=&quot;text&quot; name=&quot;result&quot;>
<input type=&quot;button&quot; name=&quot;go&quot; value=&quot;Click&quot; onClick=&quot;upDate(this.form)&quot;>
</FORM>
b[sup]2[/sup] - benbiddington@surf4nix.com

 

[sjf]

Cheers, worked perfectly !
sjf