Button: Fix backcompat when called on collection of mixed elements

Fixes #15109
Closes gh-1808

tests/unit/button/deprecated.html

@@ -56,6 +56,14 @@
 <button id="button1">Button</button>
 <a href="#" id="anchor-button">Anchor Button</a>
 
+<div class="mixed">
+	<a href="#" id="mixed-anchor">Anchor</a>
+	<button id="mixed-button" disabled>Button</button>
+	<input type="button" value="Button" id="mixed-input">
+	<input type="checkbox" id="mixed-check" name="check"><label for="mixed-check">Check</label>
+	<input type="radio" id="mixed-radio" name="radio"><label for="mixed-radio">Radio</label>
+</div>
+
 </div>
 </body>
 </html>

tests/unit/button/deprecated.js

@@ -194,4 +194,22 @@ QUnit.test( "icon / icons options properly proxied", function( assert ) {
 		"Icons secondary option sets iconPosition option to end on init" );
 } );
 
+QUnit.test( "Calling button on a collection of mixed types works correctly", function( assert ) {
+	assert.expect( 5 );
+
+	var group = $( ".mixed" ).children();
+
+	group.button();
+
+	$.each( {
+		anchor: "button",
+		button: "button",
+		check: "checkboxradio",
+		input: "button",
+		radio: "checkboxradio"
+	}, function( type, widget ) {
+		assert.ok( $( "#mixed-" + type )[ widget ]( "instance" ), type + " is a " + widget );
+	} );
+} );
+
 } );

ui/widgets/button.js

@@ -342,22 +342,81 @@ if ( $.uiBackCompat !== false ) {
 	} );
 
 	$.fn.button = ( function( orig ) {
-		return function() {
-			if ( !this.length || ( this.length && this[ 0 ].tagName !== "INPUT" ) ||
-					( this.length && this[ 0 ].tagName === "INPUT" && (
-						this.attr( "type" ) !== "checkbox" && this.attr( "type" ) !== "radio"
-					) ) ) {
-				return orig.apply( this, arguments );
-			}
-			if ( !$.ui.checkboxradio ) {
-				$.error( "Checkboxradio widget missing" );
-			}
-			if ( arguments.length === 0 ) {
-				return this.checkboxradio( {
-					"icon": false
+		return function( options ) {
+			var isMethodCall = typeof options === "string";
+			var args = Array.prototype.slice.call( arguments, 1 );
+			var returnValue = this;
+
+			if ( isMethodCall ) {
+
+				// If this is an empty collection, we need to have the instance method
+				// return undefined instead of the jQuery instance
+				if ( !this.length && options === "instance" ) {
+					returnValue = undefined;
+				} else {
+					this.each( function() {
+						var methodValue;
+						var type = $( this ).attr( "type" );
+						var name = type !== "checkbox" && type !== "radio" ?
+							"button" :
+							"checkboxradio";
+						var instance = $.data( this, "ui-" + name );
+
+						if ( options === "instance" ) {
+							returnValue = instance;
+							return false;
+						}
+
+						if ( !instance ) {
+							return $.error( "cannot call methods on button" +
+								" prior to initialization; " +
+								"attempted to call method '" + options + "'" );
+						}
+
+						if ( !$.isFunction( instance[ options ] ) || options.charAt( 0 ) === "_" ) {
+							return $.error( "no such method '" + options + "' for button" +
+								" widget instance" );
+						}
+
+						methodValue = instance[ options ].apply( instance, args );
+
+						if ( methodValue !== instance && methodValue !== undefined ) {
+							returnValue = methodValue && methodValue.jquery ?
+								returnValue.pushStack( methodValue.get() ) :
+								methodValue;
+							return false;
+						}
+					} );
+				}
+			} else {
+
+				// Allow multiple hashes to be passed on init
+				if ( args.length ) {
+					options = $.widget.extend.apply( null, [ options ].concat( args ) );
+				}
+
+				this.each( function() {
+					var type = $( this ).attr( "type" );
+					var name = type !== "checkbox" && type !== "radio" ? "button" : "checkboxradio";
+					var instance = $.data( this, "ui-" + name );
+
+					if ( instance ) {
+						instance.option( options || {} );
+						if ( instance._init ) {
+							instance._init();
+						}
+					} else {
+						if ( name === "button" ) {
+							orig.call( $( this ), options );
+							return;
+						}
+
+						$( this ).checkboxradio( $.extend( { icon: false }, options ) );
+					}
 				} );
 			}
-			return this.checkboxradio.apply( this, arguments );
+
+			return returnValue;
 		};
 	} )( $.fn.button );