Web page field validation

Question

I need to validate a date/time field on a webpage but want it to do it without reloading the page and would like 'instant' feedback for the users.

What's the best/easiest solution. BTW: easiest scores 65% of total points

Edit: What if best was 65% of total points?

Answer 1

If you would like to use JavaScript then it has built in date validation functions. However, if you do not want to go the JavaScript route, you could change the UI to dropdown controls which would limit the users ability to enter invalid data. You would still need to check server side to ensure nobody submits Feb 30th.

Answer 2

Check out this javascript date validation function.

It uses javascript, regular expressions and the 'onblur' event of a text input.