Fixed #177 - Fix validation of a single radio or checkbox input

The validator element() method delegates to check(). When check() is
passed a radio or checkbox input element (call it 'A'), it instead
checks the first element with the same name in the form (call it 'B').

If element B is judged invalid, a bug occurs. Element A will have been
added to the currentElements array, but element B is what is added to
the errorList. So, when showErrors is called, element A will be in
validElements(), and will be unhighlighted.

This is fixed by having element() also change its target to be the
first element of the same name when passed a checkbox or radio input.

Signed-off-by: Eric Naeseth <eric@thumbtack.com>

changelog.txt

@@ -12,6 +12,7 @@
 * Fixed swedish and norwedian translations, min/max messages got switched. Fixes #181
 * Fixed #184 - resetForm: should unset lastElement
 * Fixed #71 - improve existing time method and add time12h method for 12h am/pm time format
+* Fixed #177 - Fix validation of a single radio or checkbox input
 
 1.8.1
 ---

jquery.validate.js

@@ -349,7 +349,7 @@ $.extend($.validator, {
 
 		// http://docs.jquery.com/Plugins/Validation/Validator/element
 		element: function( element ) {
-			element = this.clean( element );
+			element = this.validationTargetFor( this.clean( element ) );
 			this.lastElement = element;
 			this.prepareElement( element );
 			this.currentElements = $(element);
@@ -493,12 +493,7 @@ $.extend($.validator, {
 		},
 
 		check: function( element ) {
-			element = this.clean( element );
+			element = this.validationTargetFor( this.clean( element ) );
-
-			// if radio/checkbox, validate first element in group instead
-			if (this.checkable(element)) {
-				element = this.findByName( element.name ).not(this.settings.ignore)[0];
-			}
 
 			var rules = $(element).rules();
 			var dependencyMismatch = false;
@@ -679,6 +674,14 @@ $.extend($.validator, {
 			return this.groups[element.name] || (this.checkable(element) ? element.name : element.id || element.name);
 		},
 
+		validationTargetFor: function(element) {
+			// if radio/checkbox, validate first element in group instead
+			if (this.checkable(element)) {
+				element = this.findByName( element.name ).not(this.settings.ignore)[0];
+			}
+			return element;
+		},
+
 		checkable: function( element ) {
 			return /radio|checkbox/i.test(element.type);
 		},

test/test.js

@@ -1113,6 +1113,28 @@ test("validate multiple checkbox on click", function() {
 	errors(1);
 });
 
+test("correct checkbox receives the error", function(){
+	function trigger(element) {
+		element.click();
+		// triggered click event screws up checked-state in 1.4 
+		element.valid();
+	}
+	var e1 = $("#check1").attr("checked", false);
+	var e2 = $("#check1b").attr("checked", false);
+    var v = $("#form").find('[type=checkbox]').attr('checked', false).end().validate({
+        rules:{
+            check: {
+                    required: true,
+                    minlength: 2
+            }
+        }
+    });
+    equals(false, v.form());
+    trigger(e1);
+    equals(false, v.form());
+    ok(v.errorList[0].element.id === v.currentElements[0].id, "the proper checkbox has the error AND is present in currentElements");
+});
+
 test("validate radio on click", function() {
 	function errors(expected, message) {
 		equals(expected, v.size(), message );