IE: with _onDayClick in dijit._Calendar

[datasage]

While trying to track down a diffrent IE6 error with the DateTimeTextBox, I found an issue with the event handling for the onDayClick function.

In IE6, if you click on a day, hold down the mouse button and drag the mouse to another day before releasing the button, an error will be generated in this function:

_onDayClick: function(/*Event*/evt){
			var node = evt.target;
			dojo.stopEvent(evt);
			while(!node.dijitDateValue){
				node = node.parentNode;
			}
			if(!dojo.hasClass(node, "dijitCalendarDisabledDate")){
				this.attr('value', node.dijitDateValue);
				this.onValueSelected(this.value);
			}
		},

Essentially, with that action, the event object does not have a target member.

Steps to reproduce:

1. In IE6 go to the test page: http://download.dojotoolkit.org/current-dev/dojo-release-1.2.0/dijit/tests/form/test_DateTextBox.html
2. Click on any DateTimeTextBox to open the calendar.
3. Click on a day, and hold down the mouse button.
4. Move the mouse to another day, and release.
5. You will see an error message.

I tested in IE6 and FF3. Only IE6 would produce the error.

[bill]

Adam, can you handle?

The obvious solution would be to setup a separate handler on each day node. Might be a performance hit though.

Alternately, maybe there's another property in the event object we can use, like evt.relatedTarget.

Or, could just ignore the event in the case that evt.target is null.

[peller]

Fixed in [15790] and [15792]