How to disable error popup when constraint = "no empty" have been used in the Textbox?

answered 2013-03-22 13:09:07 +0800

This post is a wiki. Anyone with karma >100 is welcome to improve it.

updated 2013-03-22 13:10:01 +0800

gganassin
540 ● 6
http://www.hybris.com/

Your can do as you prefere: probably the best way is the following:

public class MyNoEmptyConstraint implements Constraint {
public void validate(Component comp, Object value) throws WrongValueException {
    if (value == null || value.toString().equals("")) {
        throw new WrongValueException("Huston we have a problem!");
    }
}

}

then in your zk.xml:

    <error-page>
    <exception-type>org.zkoss.zk.ui.WrongValueException</exception-type>
    <location>/WEB-INF/sys/error.zul</location>
</error-page>

finally in the error.zul you can do what ever you like... for instance:

<script type="text/javascript" >
alert("Error: ${requestScope['javax.servlet.error.message']}");

</script>

Mind that the native popup error on the textbox comes when you set the constraint="something" in the zul... not if you let your custom constraint to throw the WrongValueEx.

answered 2013-03-21 09:05:49 +0800

This post is a wiki. Anyone with karma >100 is welcome to improve it.

updated 2013-03-21 09:05:49 +0800

gganassin
540 ● 6
http://www.hybris.com/

Hi! The popup appears every time you will try to move the focus away from your constrained component. As far as i know there is now way to control this at least Java side.

You can always create your own constraint (implementing org.zkoss.zul.Constraint) and then you can decide how to inform the user that that field is mandatory.

Personally i'm using jGrowl (http://plugins.jquery.com/jgrowl/) for the messaging which is less invasive than the ZK default constraint popup for the user.

Clients.evalJavaScript("$.jGrowl(\"" + message + "\", {theme:  'notif" + level + "', life: 5000 });");