adding values in text boxes

[Guest_imported]

if i have three text boxes and i want to add the 3 values togeather and say if they are greater than a certain number. How would i go about doing this.

 

[GIGN]

Well firstly, since they are input as Strings - you will need to convert them to Numbers. If you do not, they will be added together like strings (concatenated) - meaning 1+2=12.

function add(form){
var No1 = new Number(form.v1.value);
var No2 = new Number(form.v2.value);
var No3 = new Number(form.v3.value);

var answer = No1+No2+No3;
form.answer.value = answer;
if(answer > 10){
alert("Numbers add to more than 10&quot
}

}

Where the function is called from a buton like this:

<input type=&quot;button&quot; onClick=&quot;add(this.form)&quot;...>

And the v1,v2,v3 are just the names of the three text fields for input.

The this.form attribute holds the form object for the element we call it on - in this case the button - so we are sending the function the complete form object to operate on. ;-)
b² - benbiddington@surf4nix.com