Datebox: Custom parsing of the entered date

<zk xmlns:w="client">
	<zscript><![CDATA[
		class CustomDatebox extends Datebox {
			addClientEvent(CustomDatebox.class, "onCustomParse", CE_IMPORTANT|CE_DUPLICATE_IGNORE);
			// override
			public void service(org.zkoss.zk.au.AuRequest request, boolean everError) {
				final String cmd = request.getCommand();
				if (cmd.equals("onCustomParse")) {
					String value = (String)request.getData().get("value");
					if ("1".equals(value)) { // parse value to date
						setValue(new Date(System.currentTimeMillis()));
						smartUpdate("backToOriginal", "clear");
					} else if ("2".equals(value)) { // parse value to date
						setValue(new Date(System.currentTimeMillis() - (1000L * 60 * 60 * 24 * 365)));
						smartUpdate("backToOriginal", "clear");
					}
					else // can not parse, use original client side value
						smartUpdate("backToOriginal", "reset");
				} else 
					super.service(request, everError);
			}
		}
		]]></zscript>
	<datebox lenient="true" use="CustomDatebox"
		onCustomParse="">
		<attribute w:name="doBlur_">
			function (evt) {
				// tmp store the old value
				var oldValue = this.$n('real').value;
				this.$doBlur_(evt);
				// store the new value
				this._newValue = this.$n('real').value;
				// tmp set the old value to input
				this.$n('real').value = oldValue;
				// ask a custom parse from server
				this.fire('onCustomParse', {value: oldValue});
			}
		</attribute>
		<attribute w:name="setBackToOriginal">
			function (v) {
				// reset to original value as need then clear it
				if (this._newValue) {
					if (v == 'reset')
						this.$n('real').value = this._newValue;
					this._newValue = null;
				}
			}
		</attribute>
	</datebox>
</zk>