1 files changed, 59 insertions, 0 deletions
diff --git a/resources/src/mediawiki.action/mediawiki.action.edit.editWarning.js b/resources/src/mediawiki.action/mediawiki.action.edit.editWarning.js
new file mode 100644
index 00000000..b5654400
--- /dev/null
+++ b/resources/src/mediawiki.action/mediawiki.action.edit.editWarning.js
@@ -0,0 +1,59 @@
+/*
+ * Javascript for module editWarning
+ */
+( function ( mw, $ ) {
+	'use strict';
+
+	$( function () {
+		var savedWindowOnBeforeUnload,
+			$wpTextbox1 = $( '#wpTextbox1' ),
+			$wpSummary = $( '#wpSummary' );
+		// Check if EditWarning is enabled and if we need it
+		if ( $wpTextbox1.length === 0 ) {
+			return true;
+		}
+		// Get the original values of some form elements
+		$wpTextbox1.add( $wpSummary ).each( function () {
+			$( this ).data( 'origtext', $( this ).val() );
+		} );
+		$( window )
+			.on( 'beforeunload.editwarning', function () {
+				var retval;
+
+				// Check if the current values of some form elements are the same as
+				// the original values
+				if (
+					mw.config.get( 'wgAction' ) === 'submit' ||
+						$wpTextbox1.data( 'origtext' ) !== $wpTextbox1.textSelection( 'getContents' ) ||
+						$wpSummary.data( 'origtext' ) !== $wpSummary.textSelection( 'getContents' )
+				) {
+					// Return our message
+					retval = mw.msg( 'editwarning-warning' );
+				}
+
+				// Unset the onbeforeunload handler so we don't break page caching in Firefox
+				savedWindowOnBeforeUnload = window.onbeforeunload;
+				window.onbeforeunload = null;
+				if ( retval !== undefined ) {
+					// ...but if the user chooses not to leave the page, we need to rebind it
+					setTimeout( function () {
+						window.onbeforeunload = savedWindowOnBeforeUnload;
+					}, 1 );
+					return retval;
+				}
+			} )
+			.on( 'pageshow.editwarning', function () {
+				// Re-add onbeforeunload handler
+				if ( !window.onbeforeunload ) {
+					window.onbeforeunload = savedWindowOnBeforeUnload;
+				}
+			} );
+
+		// Add form submission handler
+		$( '#editform' ).submit( function () {
+			// Unbind our handlers
+			$( window ).off( '.editwarning' );
+		} );
+	} );
+
+}( mediaWiki, jQuery ) );