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mediawiki/resources/src/mediawiki.special/mediawiki.special.preferences.js
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mediawiki.special.preferences.js
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			/*!
			* JavaScript for Special:Preferences
			*/
			jQuery( function ( $ ) {
			var $preftoc, $preferences, $fieldsets, $legends,
			hash, labelFunc,
			$tzSelect, $tzTextbox, $localtimeHolder, servertime,
			$checkBoxes, allowCloseWindow;

			labelFunc = function () {
			return this.id.replace( /^mw-prefsection/g, 'preftab' );
			};

			$( '#prefsubmit' ).attr( 'id', 'prefcontrol' );
			$preftoc = $( '<ul>' )
			.attr( {
			id: 'preftoc',
			role: 'tablist'
			} );
			$preferences = $( '#preferences' )
			.addClass( 'jsprefs' )
			.before( $preftoc );
			$fieldsets = $preferences.children( 'fieldset' )
			.hide()
			.attr( {
			role: 'tabpanel',
			'aria-hidden': 'true',
			'aria-labelledby': labelFunc
			} )
			.addClass( 'prefsection' );
			$legends = $fieldsets
			.children( 'legend' )
			.addClass( 'mainLegend' );

			// Make sure the accessibility tip is selectable so that screen reader users take notice,
			// but hide it per default to reduce interface clutter. Also make sure it becomes visible
			// when selected. Similar to jquery.mw-jump
			$( '<div>' ).addClass( 'mw-navigation-hint' )
			.text( mediaWiki.msg( 'prefs-tabs-navigation-hint' ) )
			.attr( 'tabIndex', 0 )
			.on( 'focus blur', function ( e ) {
			if ( e.type === 'blur' \|\| e.type === 'focusout' ) {
			$( this ).css( 'height', '0' );
			} else {
			$( this ).css( 'height', 'auto' );
			}
			} ).insertBefore( $preftoc );

			/**
			* It uses document.getElementById for security reasons (HTML injections in $()).
			*
			* @ignore
			* @param String name: the name of a tab without the prefix ("mw-prefsection-")
			* @param String mode: [optional] A hash will be set according to the current
			* open section. Set mode 'noHash' to surpress this.
			*/
			function switchPrefTab( name, mode ) {
			var $tab, scrollTop;
			// Handle hash manually to prevent jumping,
			// therefore save and restore scrollTop to prevent jumping.
			scrollTop = $( window ).scrollTop();
			if ( mode !== 'noHash' ) {
			location.hash = '#mw-prefsection-' + name;
			}
			$( window ).scrollTop( scrollTop );

			$preftoc.find( 'li' ).removeClass( 'selected' )
			.find( 'a' ).attr( {
			tabIndex: -1,
			'aria-selected': 'false'
			} );

			$tab = $( document.getElementById( 'preftab-' + name ) );
			if ( $tab.length ) {
			$tab.attr( {
			tabIndex: 0,
			'aria-selected': 'true'
			} )
			.focus()
			.parent().addClass( 'selected' );

			$preferences.children( 'fieldset' ).hide().attr( 'aria-hidden', 'true' );
			$( document.getElementById( 'mw-prefsection-' + name ) ).show().attr( 'aria-hidden', 'false' );
			}
			}

			// Populate the prefToc
			$legends.each( function ( i, legend ) {
			var $legend = $( legend ),
			ident, $li, $a;
			if ( i === 0 ) {
			$legend.parent().show();
			}
			ident = $legend.parent().attr( 'id' );

			$li = $( '<li>' )
			.attr( 'role', 'presentation' )
			.addClass( i === 0 ? 'selected' : '' );
			$a = $( '<a>' )
			.attr( {
			id: ident.replace( 'mw-prefsection', 'preftab' ),
			href: '#' + ident,
			role: 'tab',
			tabIndex: i === 0 ? 0 : -1,
			'aria-selected': i === 0 ? 'true' : 'false',
			'aria-controls': ident
			} )
			.text( $legend.text() );
			$li.append( $a );
			$preftoc.append( $li );
			} );

			// Enable keyboard users to use left and right keys to switch tabs
			$preftoc.on( 'keydown', function ( event ) {
			var keyLeft = 37,
			keyRight = 39,
			$el;

			if ( event.keyCode === keyLeft ) {
			$el = $( '#preftoc li.selected' ).prev().find( 'a' );
			} else if ( event.keyCode === keyRight ) {
			$el = $( '#preftoc li.selected' ).next().find( 'a' );
			} else {
			return;
			}
			if ( $el.length > 0 ) {
			switchPrefTab( $el.attr( 'href' ).replace( '#mw-prefsection-', '' ) );
			}
			} );

			// If we've reloaded the page or followed an open-in-new-window,
			// make the selected tab visible.
			hash = location.hash;
			if ( hash.match( /^#mw-prefsection-[\w\-]+/ ) ) {
			switchPrefTab( hash.replace( '#mw-prefsection-', '' ) );
			}

			// In browsers that support the onhashchange event we will not bind click
			// handlers and instead let the browser do the default behavior (clicking the
			// <a href="#.."> will naturally set the hash, handled by onhashchange.
			// But other things that change the hash will also be catched (e.g. using
			// the Back and Forward browser navigation).
			// Note the special check for IE "compatibility" mode.
			if ( 'onhashchange' in window &&
			( document.documentMode === undefined \|\| document.documentMode >= 8 )
			) {
			$( window ).on( 'hashchange', function () {
			var hash = location.hash;
			if ( hash.match( /^#mw-prefsection-[\w\-]+/ ) ) {
			switchPrefTab( hash.replace( '#mw-prefsection-', '' ) );
			} else if ( hash === '' ) {
			switchPrefTab( 'personal', 'noHash' );
			}
			} );
			// In older browsers we'll bind a click handler as fallback.
			// We must not have onhashchange and the click handlers, other wise
			// the click handler calls switchPrefTab() which sets the hash value,
			// which triggers onhashcange and calls switchPrefTab() again.
			} else {
			$preftoc.on( 'click', 'li a', function ( e ) {
			switchPrefTab( $( this ).attr( 'href' ).replace( '#mw-prefsection-', '' ) );
			e.preventDefault();
			} );
			}

			// Timezone functions.
			// Guesses Timezone from browser and updates fields onchange.

			$tzSelect = $( '#mw-input-wptimecorrection' );
			$tzTextbox = $( '#mw-input-wptimecorrection-other' );
			$localtimeHolder = $( '#wpLocalTime' );
			servertime = parseInt( $( 'input[name="wpServerTime"]' ).val(), 10 );

			function minutesToHours( min ) {
			var tzHour = Math.floor( Math.abs( min ) / 60 ),
			tzMin = Math.abs( min ) % 60,
			tzString = ( ( min >= 0 ) ? '' : '-' ) + ( ( tzHour < 10 ) ? '0' : '' ) + tzHour +
			':' + ( ( tzMin < 10 ) ? '0' : '' ) + tzMin;
			return tzString;
			}

			function hoursToMinutes( hour ) {
			var minutes,
			arr = hour.split( ':' );

			arr[0] = parseInt( arr[0], 10 );

			if ( arr.length === 1 ) {
			// Specification is of the form [-]XX
			minutes = arr[0] * 60;
			} else {
			// Specification is of the form [-]XX:XX
			minutes = Math.abs( arr[0] ) * 60 + parseInt( arr[1], 10 );
			if ( arr[0] < 0 ) {
			minutes *= -1;
			}
			}
			// Gracefully handle non-numbers.
			if ( isNaN( minutes ) ) {
			return 0;
			} else {
			return minutes;
			}
			}

			function updateTimezoneSelection() {
			var minuteDiff, localTime,
			type = $tzSelect.val();

			if ( type === 'guess' ) {
			// Get browser timezone & fill it in
			minuteDiff = -( new Date().getTimezoneOffset() );
			$tzTextbox.val( minutesToHours( minuteDiff ) );
			$tzSelect.val( 'other' );
			$tzTextbox.prop( 'disabled', false );
			} else if ( type === 'other' ) {
			// Grab data from the textbox, parse it.
			minuteDiff = hoursToMinutes( $tzTextbox.val() );
			} else {
			// Grab data from the $tzSelect value
			minuteDiff = parseInt( type.split( '\|' )[1], 10 ) \|\| 0;
			$tzTextbox.val( minutesToHours( minuteDiff ) );
			}

			// Determine local time from server time and minutes difference, for display.
			localTime = servertime + minuteDiff;

			// Bring time within the [0,1440) range.
			localTime = ( ( localTime % 1440 ) + 1440 ) % 1440;

			$localtimeHolder.text( mediaWiki.language.convertNumber( minutesToHours( localTime ) ) );
			}

			if ( $tzSelect.length && $tzTextbox.length ) {
			$tzSelect.change( updateTimezoneSelection );
			$tzTextbox.blur( updateTimezoneSelection );
			updateTimezoneSelection();
			}

			// Preserve the tab after saving the preferences
			// Not using cookies, because their deletion results are inconsistent.
			// Not using jStorage due to its enormous size (for this feature)
			if ( window.sessionStorage ) {
			if ( sessionStorage.getItem( 'mediawikiPreferencesTab' ) !== null ) {
			switchPrefTab( sessionStorage.getItem( 'mediawikiPreferencesTab' ), 'noHash' );
			}
			// Deleting the key, the tab states should be reset until we press Save
			sessionStorage.removeItem( 'mediawikiPreferencesTab' );

			$( '#mw-prefs-form' ).submit( function () {
			var storageData = $( $preftoc ).find( 'li.selected a' ).attr( 'id' ).replace( 'preftab-', '' );
			sessionStorage.setItem( 'mediawikiPreferencesTab', storageData );
			} );
			}

			// To disable all 'namespace' checkboxes in Search preferences
			// when 'Search in all namespaces' checkbox is ticked.
			$checkBoxes = $( '#mw-htmlform-advancedsearchoptions input[id^=mw-input-wpsearchnamespaces]' );
			if ( $( '#mw-input-wpsearcheverything' ).prop( 'checked' ) ) {
			$checkBoxes.prop( 'disabled', true );
			}
			$( '#mw-input-wpsearcheverything' ).change( function () {
			$checkBoxes.prop( 'disabled', $( this ).prop( 'checked' ) );
			} );

			// Set up a message to notify users if they try to leave the page without
			// saving.
			$( '#mw-prefs-form' ).data( 'origdata', $( '#mw-prefs-form' ).serialize() );
			allowCloseWindow = mediaWiki.confirmCloseWindow( {
			test: function () {
			return $( '#mw-prefs-form' ).serialize() !== $( '#mw-prefs-form' ).data( 'origdata' );
			},

			message: mediaWiki.msg( 'prefswarning-warning', mediaWiki.msg( 'saveprefs' ) ),
			namespace: 'prefswarning'
			} );
			$( '#mw-prefs-form' ).submit( allowCloseWindow.release() );
			$( '#mw-prefs-restoreprefs' ).click( allowCloseWindow.release() );
			} );