1 files changed, 71 insertions, 0 deletions
diff --git a/extensions/Vector/modules/ext.vector.editWarning.js b/extensions/Vector/modules/ext.vector.editWarning.js
new file mode 100644
index 00000000..d7494c70
--- /dev/null
+++ b/extensions/Vector/modules/ext.vector.editWarning.js
@@ -0,0 +1,71 @@
+/*
+ * Edit warning for Vector
+ */
+(function( $ ) {
+	$(document).ready( function() {
+		// Check if EditWarning is enabled and if we need it
+		if ( $( '#wpTextbox1' ).size() == 0 ) {
+			return true;
+		}
+		// Get the original values of some form elements
+		$( '#wpTextbox1, #wpSummary' ).each( function() {
+			$(this).data( 'origtext', $(this).val() );
+		});
+		// Attach our own handler for onbeforeunload which respects the current one
+		var fallbackWindowOnBeforeUnload = window.onbeforeunload;
+		var ourWindowOnBeforeUnload = function() {
+			var fallbackResult = undefined;
+			var retval = undefined;
+			var thisFunc = arguments.callee;
+			// Check if someone already set on onbeforeunload hook
+			if ( fallbackWindowOnBeforeUnload ) {
+				// Get the result of their onbeforeunload hook
+				fallbackResult = fallbackWindowOnBeforeUnload();
+			}
+			// Check if their onbeforeunload hook returned something
+			if ( fallbackResult !== undefined ) {
+				// Exit here, returning their message
+				retval = fallbackResult;
+			} else {
+				// Check if the current values of some form elements are the same as
+				// the original values
+				if (
+					wgAction == 'submit' ||
+					$( '#wpTextbox1' ).data( 'origtext' ) != $( '#wpTextbox1' ).val() ||
+					$( '#wpSummary' ).data( 'origtext' ) != $( '#wpSummary' ).val()
+				) {
+					// Return our message
+					retval = mediaWiki.msg( 'vector-editwarning-warning' );
+				}
+			}
+			
+			// Unset the onbeforeunload handler so we don't break page caching in Firefox
+			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 = thisFunc;
+				} );
+				return retval;
+			}
+		};
+		var pageShowHandler = function() {
+			// Re-add onbeforeunload handler
+			window.onbeforeunload = ourWindowOnBeforeUnload;
+		};
+		pageShowHandler();
+		if ( window.addEventListener ) {
+			window.addEventListener('pageshow', pageShowHandler, false);
+		} else if ( window.attachEvent ) {
+			window.attachEvent( 'pageshow', pageShowHandler );
+		}
+		
+		// Add form submission handler
+		$( 'form' ).submit( function() {
+			// Restore whatever previous onbeforeload hook existed
+			window.onbeforeunload = fallbackWindowOnBeforeUnload;
+		});
+	});
+	//Global storage of fallback for onbeforeunload hook
+	var fallbackWindowOnBeforeUnload = null;
+})( jQuery );