Datepicker: Added ability to stop datepicker from beforeShow. Fixes #…

…7602 - Ability to stop datepicker from appearing with beforeShow event handler.

(cherry picked from commit d146297)

tests/unit/datepicker/datepicker_tickets.js

@@ -29,6 +29,39 @@ test('beforeShowDay-getDate', function() {
 	inp.datepicker('hide');
 });
 
+test('Ticket 7602: Stop datepicker from appearing with beforeShow event handler', function(){
+    var inp = init('#inp',{
+        beforeShow: function(){
+            return false;
+        }
+    });
+	var dp = $('#ui-datepicker-div');
+    inp.datepicker('show');
+    equals(dp.css('display'), 'none',"beforeShow returns false");
+    inp.datepicker('destroy');
+
+    inp = init('#inp',{
+        beforeShow: function(){
+        }
+    });
+    dp = $('#ui-datepicker-div');
+    inp.datepicker('show');
+    equal(dp.css('display'), 'block',"beforeShow returns nothing");
+	inp.datepicker('hide');
+    inp.datepicker('destroy');
+
+    inp = init('#inp',{
+        beforeShow: function(){
+            return true;
+        }
+    });
+    dp = $('#ui-datepicker-div');
+    inp.datepicker('show');
+    equal(dp.css('display'), 'block',"beforeShow returns true");
+	inp.datepicker('hide');
+    inp.datepicker('destroy');
+});
+
 test('Ticket 6827: formatDate day of year calculation is wrong during day lights savings time', function(){
     var time = $.datepicker.formatDate("oo", new Date("2010/03/30 12:00:00 CDT")); 
     equals(time, "089");

ui/jquery.ui.datepicker.js

@@ -625,6 +625,7 @@ $.extend(Datepicker.prototype, {
 	},
 
 	/* Pop-up the date picker for a given input field.
+       If false returned from beforeShow event handler do not show. 
 	   @param  input  element - the input field attached to the date picker or
 	                  event - if triggered by focus */
 	_showDatepicker: function(input) {
@@ -641,7 +642,12 @@ $.extend(Datepicker.prototype, {
 			$.datepicker._curInst.dpDiv.stop(true, true);
 		}
 		var beforeShow = $.datepicker._get(inst, 'beforeShow');
-		extendRemove(inst.settings, (beforeShow ? beforeShow.apply(input, [input, inst]) : {}));
+		var beforeShowSettings = beforeShow ? beforeShow.apply(input, [input, inst]) : {};
+		if(beforeShowSettings === false){
+            //false
+			return;
+		}
+		extendRemove(inst.settings, beforeShowSettings);
 		inst.lastVal = null;
 		$.datepicker._lastInput = input;
 		$.datepicker._setDateFromField(inst);