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+/**
+ * jQuery Spinner
+ *
+ * Simple jQuery plugin to create, inject and remove spinners.
+ *
+ * @class jQuery.plugin.spinner
+ */
+( function ( $ ) {
+
+	// Default options for new spinners,
+	// stored outside the function to share between calls.
+	var defaults = {
+		id: undefined,
+		size: 'small',
+		type: 'inline'
+	};
+
+	$.extend( {
+		/**
+		 * Create a spinner element
+		 *
+		 * The argument is an object with options used to construct the spinner (see below).
+		 *
+		 * It is a good practice to keep a reference to the created spinner to be able to remove it
+		 * later. Alternatively, one can use the 'id' option and #removeSpinner (but make sure to choose
+		 * an id that's unlikely to cause conflicts, e.g. with extensions, gadgets or user scripts).
+		 *
+		 * CSS classes used:
+		 *
+		 * - .mw-spinner for every spinner
+		 * - .mw-spinner-small / .mw-spinner-large for size
+		 * - .mw-spinner-block / .mw-spinner-inline for display types
+		 *
+		 * Example:
+		 *
+		 *     // Create a large spinner reserving all available horizontal space.
+		 *     var $spinner = $.createSpinner( { size: 'large', type: 'block' } );
+		 *     // Insert above page content.
+		 *     $( '#mw-content-text' ).prepend( $spinner );
+		 *
+		 *     // Place a small inline spinner next to the "Save" button
+		 *     var $spinner = $.createSpinner( { size: 'small', type: 'inline' } );
+		 *     // Alternatively, just `$.createSpinner();` as these are the default options.
+		 *     $( '#wpSave' ).after( $spinner );
+		 *
+		 *     // The following two are equivalent:
+		 *     $.createSpinner( 'magic' );
+		 *     $.createSpinner( { id: 'magic' } );
+		 *
+		 * @static
+		 * @inheritable
+		 * @param {Object|string} [opts] Options. If a string is given, it will be treated as the value
+		 *   of the `id` option. If an object is given, the possible option keys are:
+		 * @param {string} [opts.id] If given, spinner will be given an id of "mw-spinner-{id}".
+		 * @param {string} [opts.size='small'] 'small' or 'large' for a 20-pixel or 32-pixel spinner.
+		 * @param {string} [opts.type='inline'] 'inline' or 'block'. Inline creates an inline-block with
+		 *   width and height equal to spinner size. Block is a block-level element with width 100%,
+		 *   height equal to spinner size.
+		 * @return {jQuery}
+		 */
+		createSpinner: function ( opts ) {
+			var $spinner;
+
+			if ( opts !== undefined && $.type( opts ) !== 'object' ) {
+				opts = {
+					id: opts
+				};
+			}
+
+			opts = $.extend( {}, defaults, opts );
+
+			$spinner = $( '<div>' ).addClass( 'mw-spinner' ).attr( 'title', '...' );
+			if ( opts.id !== undefined ) {
+				$spinner.attr( 'id', 'mw-spinner-' + opts.id );
+			}
+
+			$spinner.addClass( opts.size === 'large' ? 'mw-spinner-large' : 'mw-spinner-small' );
+			$spinner.addClass( opts.type === 'block' ? 'mw-spinner-block' : 'mw-spinner-inline' );
+
+			return $spinner;
+		},
+
+		/**
+		 * Remove a spinner element
+		 *
+		 * @static
+		 * @inheritable
+		 * @param {string} id Id of the spinner, as passed to #createSpinner
+		 * @return {jQuery} The (now detached) spinner element
+		 */
+		removeSpinner: function ( id ) {
+			return $( '#mw-spinner-' + id ).remove();
+		}
+	} );
+
+	/**
+	 * Inject a spinner after each element in the collection
+	 *
+	 * Inserts spinner as siblings (not children) of the target elements.
+	 * Collection contents remain unchanged.
+	 *
+	 * @param {Object|string} [opts] See #createSpinner
+	 * @return {jQuery}
+	 */
+	$.fn.injectSpinner = function ( opts ) {
+		return this.after( $.createSpinner( opts ) );
+	};
+
+	/**
+	 * @class jQuery
+	 * @mixins jQuery.plugin.spinner
+	 */
+
+}( jQuery ) );