Question

Suppose I have a table like:

create table
{
id numeric(5,3),
code varchar(10)
}

I have two text boxes in my form for the two fields.

Suppose if I type 1234578 in the first text box the error has been thrown in ASP.NET because I crossed the limit.

How can I validate in JavaScript or some other way for that particular range validation?

Answer 1

Let’s take one textbox only. Attach an ‘onchange’ event handler to your textbox like this:

<input type="text" onchange="handleChange(this);" />

Then declare a script for validation like this:

<script>
  function handleChange(input) {
    if (input.value > ..your_value_here..) alert ("Invalid input");
  }
</script>

Please note that the alert pop-up used here should not be actually used. Use a more subtle reminder at a more appropriate moment. The alert here is only to make things simple.