Core: Add $.fn.labels, $.fn.form, and $.ui.escapeSelector methods

$.fn.labels and $.fn.form mimic the native labels and form properties
$.ui.escapeSelector is for escaping attributes and urls for use as selectors

Closes gh-1546

tests/unit/core/core.html

@@ -108,6 +108,83 @@
 
 <div id="dimensions" style="float: left; height: 50px; width: 100px; margin: 1px 12px 11px 2px; border-style: solid; border-width: 3px 14px 13px 4px; padding: 5px 16px 15px 6px;"></div>
 
+<div id="labels-fragment">
+	<label for="test">1</label>
+	<div>
+		<div>
+			<form>
+				<label for="test">2</label>
+				<label>3
+					<input id="test">
+				</label>
+				<label for="test">4</label>
+			</form>
+			<label for="test">5</label>
+		</div>
+		<div>
+			<div>
+				<form>
+					<label for="test">6</label>
+				</form>
+			</div>
+		</div>
+	</div>
+	<div>
+		<div>
+			<form>
+				<label for="test">7</label>
+				<label>
+				</label>
+				<label for="test">8</label>
+			</form>
+			<label for="test">9</label>
+		</div>
+		<div>
+			<div>
+				<form>
+					<input id="test-2">
+					<label for="test">10</label>
+				</form>
+			</div>
+		</div>
+	</div>
+</div>
+
+<div id="weird-['x']-id"></div>
+</div>
+
+<!-- This is intentionally outside the test fixture. We don't want this
+markup to be removed and reinserted between tests, as it will remove saved
+refrences in the tests. -->
+<div id="form-test">
+	<input id="body:_implicit_form">
+	<input id="body:_explicit_form" form="form-1">
+	<form id="form-1">
+		<input id="form-1:_implicit_form">
+		<input id="form-1:_explicit_form" form="form-1">
+	</form>
+	<form id="form-2">
+		<input id="form-2:_implicit_form">
+		<input id="form-2:_explicit_form_other_form" form="form-1">
+	</form>
+</div>
+<div id="form-test-detached">
+	<input id="fragment:_implicit_form">
+
+	<!-- Support: Chrome > 33
+	When an input with a form attribute is inside a fragment, and not contained by any form,
+	the form property returns the proper form. However resetting the form does not reset the
+	input. The following input is commented out to stop the test from failing in this case.
+	<input id="fragment:_explicit_form" form="form-3">
+	-->
+	<form id="form-3">
+		<input id="form-3:_implicit_form">
+		<input id="form-3:_explicit_form" form="form-3">
+	</form>
+	<form id="form-4">
+		<input id="form-4:_implicit_form">
+		<input id="form-4:_explicit_form_other_form" form="form-3">
+	</form>
 </div>
 </body>
 </html>

tests/unit/core/core.js

@@ -138,4 +138,67 @@ test( "uniqueId / removeUniqueId", function() {
 	equal( el.attr( "id" ), null, "unique id has been removed from element" );
 });
 
+test( "Labels", function() {
+	expect( 2 );
+
+	var expected = [ "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" ];
+	var dom = $( "#labels-fragment" );
+
+	function testLabels( testType ) {
+		var labels = dom.find( "#test" ).labels();
+		var found = labels.map( function() {
+
+				// Support: Core 1.9 Only
+				// We use $.trim() because core 1.9.x silently fails when white space is present
+				return $.trim( $( this ).text() );
+			} ).get();
+
+		deepEqual( found, expected,
+			".labels() finds all labels in " + testType + ", and sorts them in DOM order" );
+	}
+
+	testLabels( "the DOM" );
+
+	// Detach the dom to test on a fragment
+	dom.detach();
+	testLabels( "document fragments" );
+} );
+
+( function() {
+	var domAttached = $( "#form-test" );
+	var domDetached = $( "#form-test-detached" ).detach();
+
+	function testForm( name, dom ) {
+		var inputs = dom.find( "input" );
+
+		inputs.each( function() {
+			var input = $( this );
+
+			asyncTest( name + this.id.replace( /_/g, " " ), function() {
+				expect( 1 );
+				var form = input.form();
+
+				// If input has a form the value should reset to "" if not it should be "changed"
+				var value = form.length ? "" : "changed";
+
+				input.val( "changed" );
+
+				// If there is a form we reset just that. If there is not a form, reset every form.
+				// The idea is if a form is found resetting that form should reset the input.
+				// If no form is found no amount of resetting should change the value.
+				( form.length ? form : dom.find( "form" ).addBack( "form" ) ).each( function() {
+					this.reset();
+				} );
+
+				setTimeout( function() {
+					equal( input.val(), value, "Proper form found for #" + input.attr( "id" ) );
+					start();
+				} );
+			} );
+		} );
+	}
+
+	testForm( "form: attached: ", domAttached );
+	testForm( "form: detached: ", domDetached );
+} )();
 } );

tests/unit/core/selector.js

@@ -254,4 +254,11 @@ test( "tabbable - dimensionless parent with overflow", function() {
 	isTabbable( "#dimensionlessParent", "input" );
 });
 
+test( "escapeSelector", function() {
+	expect( 1 );
+
+	equal( $( "#" + $.ui.escapeSelector( "weird-['x']-id" ) ).length, 1,
+		"properly escapes selectors to use as an id" );
+} );
+
 } );

ui/core.js

@@ -88,7 +88,15 @@ $.extend( $.ui, {
 		if ( element && element.nodeName.toLowerCase() !== "body" ) {
 			$( element ).blur();
 		}
-	}
+	},
+
+	// Internal use only
+	escapeSelector: ( function() {
+		var selectorEscape = /([!"#$%&'()*+,./:;<=>?@[\]^`{|}~])/g;
+		return function( selector ) {
+			return selector.replace( selectorEscape, "\\$1" );
+		};
+	} )()
 } );
 
 // plugins
@@ -126,6 +134,48 @@ $.fn.extend( {
 				$( this ).removeAttr( "id" );
 			}
 		} );
+	},
+
+	// Support: IE8 Only
+	// IE8 does not support the form attribute and when it is supplied. It overwrites the form prop
+	// with a string, so we need to find the proper form.
+	form: function() {
+		return typeof this[ 0 ].form === "string" ? this.closest( "form" ) : $( this[ 0 ].form );
+	},
+
+	labels: function() {
+		var ancestor, selector, id, labels, ancestors;
+
+		// Check control.labels first
+		if ( this[ 0 ].labels && this[ 0 ].labels.length ) {
+			return this.pushStack( this[ 0 ].labels );
+		}
+
+		// Support: IE <= 11, FF <= 37, Android <= 2.3 only
+		// Above browsers do not support control.labels. Everything below is to support them
+		// as well as document fragments. control.labels does not work on document fragments
+		labels = this.eq( 0 ).parents( "label" );
+
+		// Look for the label based on the id
+		id = this.attr( "id" );
+		if ( id ) {
+
+			// We don't search against the document in case the element
+			// is disconnected from the DOM
+			ancestor = this.eq( 0 ).parents().last();
+
+			// Get a full set of top level ancestors
+			ancestors = ancestor.add( ancestor.length ? ancestor.siblings() : this.siblings() );
+
+			// Create a selector for the label based on the id
+			selector = "label[for='" + $.ui.escapeSelector( id ) + "']";
+
+			labels = labels.add( ancestors.find( selector ).addBack( selector ) );
+
+		}
+
+		// Return whatever we have found for labels
+		return this.pushStack( labels );
 	}
 } );
 

ui/selectmenu.js

@@ -90,8 +90,8 @@ return $.widget( "ui.selectmenu", {
 			);
 
 		// Associate existing label with the new button
-		this.label = $( "label[for='" + this.ids.element + "']" ).attr( "for", this.ids.button );
-		this._on( this.label, {
+		this.labels = this.element.labels();
+		this._on( this.labels, {
 			click: function( event ) {
 				this.button.focus();
 				event.preventDefault();
@@ -671,7 +671,7 @@ return $.widget( "ui.selectmenu", {
 		this.button.remove();
 		this.element.show();
 		this.element.removeUniqueId();
-		this.label.attr( "for", this.ids.element );
+		this.labels.attr( "for", this.ids.element );
 	}
 } );