Button: Read disabled attribute from original element if disabled opt…

…ion is null. Fixes #5252 -Button: read disabled option from input elements.

tests/unit/button/button_defaults.js

@@ -3,7 +3,7 @@
  */
 
 var button_defaults = {
-	disabled: false,
+	disabled: null,
 	text: true,
 	label: null,
 	icons: {

tests/unit/button/button_options.js

@@ -5,6 +5,30 @@
 
 module("button: options");
 
+test("disabled, explicity value", function() {
+	$("#radio01").button({ disabled: false });
+	same(false, $("#radio01").button("option", "disabled"),
+		"disabled option set to false");
+	same(false, $("#radio01").attr("disabled"), "element is disabled");
+
+	$("#radio02").button({ disabled: true });
+	same(true, $("#radio02").button("option", "disabled"),
+		"disabled option set to true");
+	same(true, $("#radio02").attr("disabled"), "element is not disabled");
+});
+
+test("disabled, null", function() {
+	$("#radio01").button({ disabled: null });
+	same(false, $("#radio01").button("option", "disabled"),
+		"disabled option set to false");
+	same(false, $("#radio01").attr("disabled"), "element is disabled");
+
+	$("#radio02").attr("disabled", "disabled").button({ disabled: null });
+	same(true, $("#radio02").button("option", "disabled"),
+		"disabled option set to true");
+	same(true, $("#radio02").attr("disabled"), "element is not disabled");
+});
+
 test("text false without icon", function() {
 	$("#button").button({
 		text: false

ui/jquery.ui.button.js

@@ -44,6 +44,7 @@ var lastActive,
 
 $.widget( "ui.button", {
 	options: {
+		disabled: null,
 		text: true,
 		label: null,
 		icons: {
@@ -56,6 +57,10 @@ $.widget( "ui.button", {
 			.unbind( "reset.button" )
 			.bind( "reset.button", formResetHandler );
 
+		if ( typeof this.options.disabled !== "boolean" ) {
+			this.options.disabled = this.element.attr( "disabled" );
+		}
+
 		this._determineButtonType();
 		this.hasTitle = !!this.buttonElement.attr( "title" );