ZK Developer's Guide

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no future
no past
no today
a regular expression
In our example, we use no empty.
How to validate a form
In the earlier chapters, we used WrongValueException to validate a
single input field. However, when we click on the button and submit the
data of form, validation doesn't happen automatically. To validate we
have to call getValue() on an input field. If the validation is broken a
popup occurs on the concerned field. If we want to prevent such popup,
we can call the isValid() function and create our own error message.
The complete login page (login.zul) is shown as follows:
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Chapter 4
import com.packtpub.zk.media.model.*;
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