How do I Verify Date Format - mm/dd/yyyy - using Javascript

[jerrydigital]

Hi,

I have a registration form that uses the javascript validation code I have posted below. I am trying to verify that the user enters a birthdate in the format 01/11/1999

Anyone know how I can incorporate a date format code into my existing code?

Thanks for any help - Jerry

<script type="text/javascript">
<!--
function validate_form ( )
{
valid = true;
if ( document.registration.firstname.value == "")
{
alert ( "Please fill in the 'First Name' box." );
document.registration.firstname.focus();
return false;
}
if ( document.registration.birthdate.value == "")
{
alert ( "Please fill in the 'Birthdate' box." );
document.registration.birthdate.focus();
return false;
}
return valid;
}
//-->
</script>

[RamananKalirajan]

Hello Sir,

Are u using any calendar to get the date value from the user on the user must enter the date in the input in the date format as u have specified.


Regards
Ramanan Kalirajan

[jerrydigital]

Hi,

I am asking the user to enter their birthdate and would prefer if they would enter the date the way I wish.

For instance, I have a form and it says:
Birthdate(pleas e use format mm/dd/yyyy): "text box"

I would like a box to pop up just like my other javascript that says "Please enter a date in the following format "mm/dd/yyyy" if the user fails to do so.

Is there a code I can implement into the code I already have(posted above)?

thanks

[acoder]

Probably the best method would be to use a regular expression to pattern match the input. Off the top of my head, something like

/^\d{2}\/\d{2}\/\d{4}$/

Of course, this only matches the format, but doesn't validate that the date is an actual valid one.

[jerrydigital]

Thank you for your post.

I am not sure how to implement this code you speak of into my script. Any ideas?

Thanks

[acoder]

You can use the RegExp object or use the string methods for matching.

Some links:

http://www.regular-expressions.info/javascript.html

https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Regular_Expressions

https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference/Global_Objects/RegExp

Hope those help. If you get stuck, post your code.