calculating form field values

[riffy]

i have a form with six text boxes in which a number from 1 to 5 is entered based on the question next to it..
the 7th box, calculates the total of the other 6...i'm thinking i have to use the onchange handler but i'm not sure how to proceed..can you please provide some guidance?

 

[link9]

<script language=javascript>
function sumIt(){
var sum;
sum = document.formname.elementname1.value + document.formname.elementname2.value + document.formname.elementname3.value + document.formname.elementname4.value + document.formname.elementname5.value + document.formname.elementname5.value + document.formname.elementname6.value;
document.formname.sumelement.value = sum;
}
</script>

call this function onBlur for any and all of the form elements you want it to work on -- (ie. elementname1, 2, 3, etc..)

hope it helps!
Paul Prewett

 

[riffy]

thanks but this only concatenates the values together...it didn't add them up...do i need the valueOf() method?

 

[link9]

Whoops -- you're right, but I don't know the javascript method to convert a string to a number -- :-(

can anyone else help out on this issue?

 

[riffy]

never mind...i figured out how to do it...the lines have to read
(document.formname.elementname.value - 0.0), otherwise it doesn't treat the values as numbers to add and subtract..
thanks anyway...
now my only question is that whether there is an easy way of prompting users to enter only numbers between 1 and 5...i.e., if they enter 6 or higher, it should be turned into a 5 and likewise for numbers less than 1...

thanks

 

[link9]

here is something I found on the netscape site that might help for issues like the previous in the future


Syntax
parseInt(string,radix)
Parameters
string
A string that represents the value you want to parse.

radix
(Optional) An integer that represents the radix of the return value.

so you'd say:
newValue = parseInt(string, 10) -- will return a base10 type number (rather than hex or octal, which would be 16 and 8, repectively)

and yes, you could just use the existing function, but read all the values into variables first, and then if any of them were >5 or <1, you could just revert them to whatever value you want, plug the number into the text box(es) and then run the function on the new values --

paul