04-11-2014
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
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Thread Rating:
Where and how do I input a isnan statement into JavaScript?
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04-11-2014
<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.');
return;
}
At least I think this is what you're asking. Write a little more next time.
-Zachary
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.');
return;
}
At least I think this is what you're asking. Write a little more next time.
-Zachary
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