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Where and how do I input a isnan statement into JavaScript?
I've been set a task to change a field so that the user can only enter 4 digits, I know I have to enter isnan statement please help


<input type="textbox" id="tbox" maxlength="4">

This is a textbox that can only have 4 digits.

To use the isNaN function, you will need to create an if statement like this:

if(isNaN(tbox.value) === true)
alert('Not a number.');

At least I think this is what you're asking. Write a little more next time.




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