simple addition using integers stored in variables...not working

[arcana_x]

Hi All,

this must be really simple but i cant get it to work and it seems so simple that i cant find any website on why this doesnt work for me.

so i have this simple function...

function update(value, oldvalue)
{
var a = value;
var b = oldvalue;
var result = a + b;
document.form.fieldname.value=result;
}

and call the function using a field with this...

onkeyup="update(this.value, other)"

But all its doing is concatenating the 2 numbers together as though they are strings!!!

so if this.value = 11
and other = 15
it displays 1115

i want to add them and display the total, do i need to specify them as being integers or something?

Any help would be greatly appreciated!

[Pepejeria]

Values are stored as strings in the value property. You need to cast it to a Number

function update(value, oldvalue) {
  document.form.fieldname.value = parseInt(value) + parseInt(oldvalue);
}

[arcana_x]

Hi Pepejeria,

Thanks for the solution their, i have applied it and its working perfectly now!

Regards

Arc