Collapsible: Replace jqmData with getAttribute.

A minute performance bump: http://jsperf.com/collapsible-jqmdata-vs-getattribute

Author: Gabriel Schulhof

js/widgets/collapsible.js

@@ -9,6 +9,8 @@ define( [ "jquery", "../jquery.mobile.widget", "../jquery.mobile.buttonMarkup",
 //>>excludeEnd("jqmBuildExclude");
 (function( $, undefined ) {
 
+var getAttr = $.mobile.getAttribute;
+
 $.widget( "mobile.collapsible", $.mobile.widget, {
 	options: {
 		expandCueText: " click to expand contents",
@@ -45,33 +47,33 @@ $.widget( "mobile.collapsible", $.mobile.widget, {
 		if ( collapsibleSet.length ) {
 			// Inherit the theme from collapsible-set
 			if ( !o.theme ) {
-				o.theme = collapsibleSet.jqmData( "theme" ) || $.mobile.getInheritedTheme( collapsibleSet, "c" );
+				o.theme = getAttr( collapsibleSet[ 0 ], "theme", true ) || $.mobile.getInheritedTheme( collapsibleSet, "c" );
 			}
 			// Inherit the content-theme from collapsible-set
 			if ( !o.contentTheme ) {
-				o.contentTheme = collapsibleSet.jqmData( "content-theme" );
+				o.contentTheme = getAttr( collapsibleSet[ 0 ], "content-theme", true );
 			}
 
 			// Get the preference for collapsed icon in the set, but override with data- attribute on the individual collapsible
-			o.collapsedIcon = $el.jqmData( "collapsed-icon" ) || collapsibleSet.jqmData( "collapsed-icon" ) || o.collapsedIcon;
+			o.collapsedIcon = getAttr( $el[ 0 ], "collapsed-icon", true ) || getAttr( collapsibleSet[ 0 ], "collapsed-icon", true ) || o.collapsedIcon;
 
 			// Get the preference for expanded icon in the set, but override with data- attribute on the individual collapsible
-			o.expandedIcon = $el.jqmData( "expanded-icon" ) || collapsibleSet.jqmData( "expanded-icon" ) || o.expandedIcon;
+			o.expandedIcon = getAttr( $el[ 0 ], "expanded-icon", true ) || getAttr( collapsibleSet[ 0 ], "expanded-icon", true ) || o.expandedIcon;
 
 			// Gets the preference icon position in the set, but override with data- attribute on the individual collapsible
-			o.iconpos = $el.jqmData( "iconpos" ) || collapsibleSet.jqmData( "iconpos" ) || o.iconpos;
+			o.iconpos = getAttr( $el[ 0 ], "iconpos", true ) || getAttr( collapsibleSet[ 0 ], "iconpos", true ) || o.iconpos;
 
 			// Inherit the preference for inset from collapsible-set or set the default value to ensure equalty within a set
-			if ( collapsibleSet.jqmData( "inset" ) !== undefined ) {
-				o.inset = collapsibleSet.jqmData( "inset" );
+			if ( getAttr( collapsibleSet[ 0 ], "inset", true ) !== undefined ) {
+				o.inset = getAttr( collapsibleSet[ 0 ], "inset", true );
 			} else {
 				o.inset = true;
 			}
 			// Set corners for individual collapsibles to false when in a collapsible-set
 			o.corners = false;
 			// Gets the preference for mini in the set
 			if ( !o.mini ) {
-				o.mini = collapsibleSet.jqmData( "mini" );
+				o.mini = getAttr( collapsibleSet[ 0 ], "mini", true );
 			}
 		} else {
 			// get inherited theme if not a set and no theme has been set