Datebox with constraint sending unnecessary onChange Event

Steps to Reproduce

<zk>
    <datebox id="db" format="MM/dd/yyyy"
             constraint="no empty"
             onCreate="self.setValue(new Date());"
             onChange=""/>
    <datebox id="dbConstraint" format="MM/dd/yyyy"
             constraint="between 21000101 and 19000101"
             onCreate="self.setValue(new Date());"
             onChange=""/>
</zk>

focus either Datebox without changing the value
leave(blur) Datebox again

Current Result

an onChange event with the initial unchanged value is sent to the server
 

Expected Result

only send onChange when the value was changed
 

Debug Information

the constraint sets a flag this._reVald which triggers the revalidation failing to recognize the value is still unchanged

ZK-658
tomyeh added a comment - 13/Dec/11 4:46 PM

Notice if the constraint property is also specified, onChange is always fired.
Reason: [spec] if constraint is specified, the first onblur will cause the input to re-validate.

https://sourceforge.net/p/zk1/bugs/838/
In this fix, the event will be consumed and onChange won't be called.
 

Workaround

suppress update/validation logic for unchanged input value

zk.afterLoad('zul.db', function() {
    var xDatebox = {};
    zk.override(zul.db.Datebox.prototype, xDatebox, {
        updateChange_ : function() {
            if(this.getInputNode().value === this._defRawVal) {
                return false;
            }
            return xDatebox.updateChange_.apply(this, arguments);
        }
    });//zk.override
});//zk.afterLoad