1 files changed, 62 insertions, 0 deletions
diff --git a/www/wiki/resources/src/mediawiki.special/mediawiki.special.preferences.confirmClose.js b/www/wiki/resources/src/mediawiki.special/mediawiki.special.preferences.confirmClose.js
new file mode 100644
index 00000000..1476241e
--- /dev/null
+++ b/www/wiki/resources/src/mediawiki.special/mediawiki.special.preferences.confirmClose.js
@@ -0,0 +1,62 @@
+/*!
+ * JavaScript for Special:Preferences: Enable save button and prevent the window being accidentally
+ * closed when any form field is changed.
+ */
+( function ( mw, $ ) {
+	$( function () {
+		var allowCloseWindow;
+
+		// Check if all of the form values are unchanged
+		function isPrefsChanged() {
+			var inputs = $( '#mw-prefs-form :input[name]' ),
+				input, $input, inputType,
+				index, optIndex,
+				opt;
+
+			for ( index = 0; index < inputs.length; index++ ) {
+				input = inputs[ index ];
+				$input = $( input );
+
+				// Different types of inputs have different methods for accessing defaults
+				if ( $input.is( 'select' ) ) {
+					// <select> has the property defaultSelected for each option
+					for ( optIndex = 0; optIndex < input.options.length; optIndex++ ) {
+						opt = input.options[ optIndex ];
+						if ( opt.selected !== opt.defaultSelected ) {
+							return true;
+						}
+					}
+				} else if ( $input.is( 'input' ) || $input.is( 'textarea' ) ) {
+					// <input> has defaultValue or defaultChecked
+					inputType = input.type;
+					if ( inputType === 'radio' || inputType === 'checkbox' ) {
+						if ( input.checked !== input.defaultChecked ) {
+							return true;
+						}
+					} else if ( input.value !== input.defaultValue ) {
+						return true;
+					}
+				}
+			}
+
+			return false;
+		}
+
+		// Disable the button to save preferences unless preferences have changed
+		// Check if preferences have been changed before JS has finished loading
+		$( '#prefcontrol' ).prop( 'disabled', !isPrefsChanged() );
+		$( '#preferences > fieldset' ).on( 'change keyup mouseup', function () {
+			$( '#prefcontrol' ).prop( 'disabled', !isPrefsChanged() );
+		} );
+
+		// Set up a message to notify users if they try to leave the page without
+		// saving.
+		allowCloseWindow = mw.confirmCloseWindow( {
+			test: isPrefsChanged,
+			message: mw.msg( 'prefswarning-warning', mw.msg( 'saveprefs' ) ),
+			namespace: 'prefswarning'
+		} );
+		$( '#mw-prefs-form' ).submit( $.proxy( allowCloseWindow, 'release' ) );
+		$( '#mw-prefs-restoreprefs' ).click( $.proxy( allowCloseWindow, 'release' ) );
+	} );
+}( mediaWiki, jQuery ) );