Steps to Reproduce

https://zkfiddle.org/sample/1up95ua/2-tri-state-checkmark-disabled

Click inside the red square, but outside the checkmark for the 1st and 2nd checkmarks (3 and 4 are regular checkmarks)

these checkboxes are disabled.

Current Result

checkbox state is updated

Expected Result

checkbox state is not updated

Debug Information

There is on disabled check in the checbox doClick.

Regular checkbox have 2 workflows:

• If click on disabled html checkmark: no event due to disabled dom element not firing event
• if click inside the border of the checkbox component, but outside the html checkmark, the doClick_ method will fire and check if dom checked status == current checked status. If yes, it returns and does not update.

On tri-state checkbox:

doClick_ (from dom checkmark, or from outer checkbox span) directly trigger changeState. disabled dom checkmark doesn't fire events, but the outer checkbox span will still resolve to the doClick_ method.

Workaround

Add a disable check:

<script><![CDATA[ 
		zk.afterLoad("zul.wgt", function () {
		    var _xCheckbox = {};
		    zk.override(zul.wgt.Checkbox.prototype, _xCheckbox, {
		        doClick_: function() {
		    		if(this.isDisabled()){
		    			return;
		    		}
					var result = _xCheckbox.doClick_.apply(this, arguments);
					return result;
		        }
		     });
		});
	]]></script>