org.zkoss.zul
Interface Constraint

All Known Implementing Classes:

SimpleConstraint, SimpleDateConstraint, SimpleDoubleSpinnerConstraint, SimpleSpinnerConstraint

public interface Constraint

A constraint. Instead of implementing this interface, you may use SimpleConstraint if applicable.

To have better responsiveness, you can handle all (or some) validation at the client by implementing an additional interface, ClientConstraint.

If you prefer to have a custom way to display the error message (other than the default error box). You can also implement CustomConstraint. Then, CustomConstraint.showCustomError(org.zkoss.zk.ui.Component, org.zkoss.zk.ui.WrongValueException) is called instead of showing the default error box.

Since 5.0.0, ClientConstraint takes higher priority if both implemented.

Author:

tomyeh

See Also:

CustomConstraint, ClientConstraint

Method Summary

void	validate(Component comp, java.lang.Object value) Verifies whether the value is acceptable.

Method Detail

validate

void validate(Component comp,
              java.lang.Object value)
              throws WrongValueException

Verifies whether the value is acceptable.

Parameters:

comp - the component being validated

Throws:

WrongValueException