how to validate field right after the data is entered

[Wei, Mei]

Hi,

 

We want to validate the field data right after the data is entered. So
that the user can fix the error right away instead of waiting until the
whole form is submitted.

We thought that struts2 and ajax can help us on that. But what would be
the best way to do?

 

Any helps or guidance are appreciated.

 

Thanks,

Mei