Combine and validate two form elements

[CodeX]

Hi, this is sure to be simple, but I am stupied so must ask...

I have a form that has two editable values and a hidden value

I want to combine the two editable values say val1 and val2 (both are text fields) in the form then check to see they are =< 100 characters (combined!!!).

I then want to send the values (val1 + val2) + the hidden field to another page when the user hits the submit button.

Can someone please show me some articles that discuss how to do this, or maybe write a sample form with the <?php ?> that would go with it.

[csousley]

is this what you mean?

$var1 = "this is var 1";
$var2 = "this is var 2";
$combine = $var1.$var2;
echo $combine;
$count_combine = strlen($combine);
echo " = ".$count_combine;

then an if statement to test your =< 100...

[ClevaTreva]

Hi

I think you will need javascript.

For the submit button, make it have a javascript onclick event, then the script can fetch the values, concatenate them, check the length, display a warning or submit the form, as appropriate.

Of course, this relies on java being enabled, so it is no good for defending against attacks or abuse.

It's too late at night to code it for you and check it, but here's a stab:

Assume the input fields ar named name1 and name2, and the hidden field is named hidden1 and a final field, the one to submit, named submit1

Whoops, forgot the submit!!!

Assume the form that contains the hidden submit1 field is named myform.

<script>
function combineVars()
{
var resultSTR = name1.value+name2.value;
if (resultSTR.length>100)
{
alert("The field lengths are too big.");
}
else
{
submit1.value = hidden1.value+resultSTR;
document.myform.submit();
}
}
</script>

Trevor