+ },
+
+ /**
+ * Checks if a certain protection level is cascadeable.
+ *
+ * @param {string} level
+ * @return {boolean}
+ */
+ isCascadeableLevel: function ( level ) {
+ return $.inArray( level, mw.config.get( 'wgCascadeableLevels' ) ) !== -1;
+ },
+
+ /**
+ * When protection levels are locked together, update the rest
+ * when one action's level changes
+ *
+ * @param {Element} source Level selector that changed
+ */
+ updateLevels: function ( source ) {
+ if ( !this.isUnchained() ) {
+ this.setAllSelectors( source.selectedIndex );
+ }
+ this.updateCascadeCheckbox();
+ },
+
+ /**
+ * When protection levels are locked together, update the
+ * expiries when one changes
+ *
+ * @param {Element} source expiry input that changed
+ */
+
+ updateExpiry: function ( source ) {
+ if ( !this.isUnchained() ) {
+ this.getExpiryInputs().each( function () {
+ this.value = source.value;
+ } );
+ }
+ if ( this.isUnchained() ) {
+ $( '#' + source.id.replace( /^mwProtect-(\w+)-expires$/, 'mwProtectExpirySelection-$1' ) ).val( 'othertime' );
+ } else {
+ this.getExpirySelectors().each( function () {
+ this.value = 'othertime';
+ } );
+ }
+ },
+
+ /**
+ * When protection levels are locked together, update the
+ * expiry lists when one changes and clear the custom inputs
+ *
+ * @param {Element} source Expiry selector that changed
+ */
+ updateExpiryList: function ( source ) {
+ if ( !this.isUnchained() ) {
+ this.getExpirySelectors().each( function () {
+ this.value = source.value;
+ } );
+ this.getExpiryInputs().each( function () {
+ this.value = '';
+ } );
+ }
+ },
+
+ /**
+ * Update chain status and enable/disable various bits of the UI
+ * when the user changes the "unlock move permissions" checkbox
+ */
+ onChainClick: function () {
+ this.toggleUnchainedInputs( this.isUnchained() );
+ if ( !this.isUnchained() ) {
+ this.setAllSelectors( this.getMaxLevel() );
+ }
+ this.updateCascadeCheckbox();
+ },
+
+ /**
+ * Returns true if the named attribute in all objects in the given array are matching
+ *
+ * @param {Object[]} objects
+ * @param {string} attrName
+ * @return {boolean}
+ */
+ matchAttribute: function ( objects, attrName ) {
+ return $.map( objects, function ( object ) {
+ return object[ attrName ];
+ } ).filter( function ( item, index, a ) {
+ return index === a.indexOf( item );
+ } ).length === 1;
+ },
+
+ /**
+ * Are all actions protected at the same level, with the same expiry time?
+ *
+ * @return {boolean}
+ */
+ areAllTypesMatching: function () {
+ return this.matchAttribute( this.getLevelSelectors(), 'selectedIndex' ) &&
+ this.matchAttribute( this.getExpirySelectors(), 'selectedIndex' ) &&
+ this.matchAttribute( this.getExpiryInputs(), 'value' );
+ },
+
+ /**
+ * Is protection chaining off?
+ *
+ * @return {boolean}
+ */
+ isUnchained: function () {
+ var element = document.getElementById( 'mwProtectUnchained' );
+ return element ?
+ element.checked :
+ true; // No control, so we need to let the user set both levels
+ },
+
+ /**
+ * Find the highest protection level in any selector
+ *
+ * @return {number}
+ */
+ getMaxLevel: function () {
+ return Math.max.apply( Math, this.getLevelSelectors().map( function () {
+ return this.selectedIndex;
+ } ) );
+ },
+
+ /**
+ * Protect all actions at the specified level
+ *
+ * @param {number} index Protection level
+ */
+ setAllSelectors: function ( index ) {
+ this.getLevelSelectors().each( function () {
+ this.selectedIndex = index;