X-Git-Url: https://scripts.mit.edu/gitweb/autoinstallsdev/mediawiki.git/blobdiff_plain/19e297c21b10b1b8a3acad5e73fc71dcb35db44a..6932310fd58ebef145fa01eb76edf7150284d8ea:/resources/src/jquery/jquery.tabIndex.js

diff --git a/resources/src/jquery/jquery.tabIndex.js b/resources/src/jquery/jquery.tabIndex.js
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+/**
+ * @class jQuery.plugin.tabIndex
+ */
+( function ( $ ) {
+
+	/**
+	 * Find the lowest tabindex in use within a selection.
+	 *
+	 * @return {number} Lowest tabindex on the page
+	 */
+	$.fn.firstTabIndex = function () {
+		var minTabIndex = null;
+		$( this ).find( '[tabindex]' ).each( function () {
+			var tabIndex = parseInt( $( this ).prop( 'tabindex' ), 10 );
+			// In IE6/IE7 the above jQuery selector returns all elements,
+			// becuase it has a default value for tabIndex in IE6/IE7 of 0
+			// (rather than null/undefined). Therefore check "> 0" as well.
+			// Under IE7 under Windows NT 5.2 is also capable of returning NaN.
+			if ( tabIndex > 0 && !isNaN( tabIndex ) ) {
+				// Initial value
+				if ( minTabIndex === null ) {
+					minTabIndex = tabIndex;
+				} else if ( tabIndex < minTabIndex ) {
+					minTabIndex = tabIndex;
+				}
+			}
+		} );
+		return minTabIndex;
+	};
+
+	/**
+	 * Find the highest tabindex in use within a selection.
+	 *
+	 * @return {number} Highest tabindex on the page
+	 */
+	$.fn.lastTabIndex = function () {
+		var maxTabIndex = null;
+		$( this ).find( '[tabindex]' ).each( function () {
+			var tabIndex = parseInt( $( this ).prop( 'tabindex' ), 10 );
+			if ( tabIndex > 0 && !isNaN( tabIndex ) ) {
+				// Initial value
+				if ( maxTabIndex === null ) {
+					maxTabIndex = tabIndex;
+				} else if ( tabIndex > maxTabIndex ) {
+					maxTabIndex = tabIndex;
+				}
+			}
+		} );
+		return maxTabIndex;
+	};
+
+	/**
+	 * @class jQuery
+	 * @mixins jQuery.plugin.tabIndex
+	 */
+
+}( jQuery ) );