From 96f9c84b7b2149c6b93ac226a52065652f218e1e Mon Sep 17 00:00:00 2001
From: =?utf8?q?Scott=20Gonz=C3=A1lez?= <scott.gonzalez@gmail.com>
Date: Tue, 3 Apr 2012 16:47:14 -0400
Subject: [PATCH] Autocomplete: Move race condition logic from ajax requests to
 general response handler. Fixes #8234 - Autocomplete: Automatic
 race-condition handling for custom sources.

---
 tests/unit/autocomplete/autocomplete_core.js | 29 +++++++++++++++
 ui/jquery.ui.autocomplete.js                 | 38 ++++++++++----------
 2 files changed, 49 insertions(+), 18 deletions(-)

diff --git a/tests/unit/autocomplete/autocomplete_core.js b/tests/unit/autocomplete/autocomplete_core.js
index ef6ea58af..daeea0972 100644
--- a/tests/unit/autocomplete/autocomplete_core.js
+++ b/tests/unit/autocomplete/autocomplete_core.js
@@ -123,4 +123,33 @@ test( "allow form submit on enter when menu is not active", function() {
 	}
 })();
 
+asyncTest( "handle race condition", function() {
+	expect( 3 );
+	var count = 0,
+		element = $( "#autocomplete" ).autocomplete({
+		source: function( request, response ) {
+			count++;
+			if ( request.term.length === 1 ) {
+				equal( count, 1, "request with 1 character is first" );
+				setTimeout(function() {
+					response([ "one" ]);
+					setTimeout( checkResults, 1 );
+				}, 1 );
+				return;
+			}
+			equal( count, 2, "request with 2 characters is second" );
+			response([ "two" ]);
+		}
+	});
+
+	element.autocomplete( "search", "a" );
+	element.autocomplete( "search", "ab" );
+
+	function checkResults() {
+		equal( element.autocomplete( "widget" ).find( ".ui-menu-item" ).text(), "two",
+			"correct results displayed" );
+		start();
+	}
+});
+
 }( jQuery ) );
diff --git a/ui/jquery.ui.autocomplete.js b/ui/jquery.ui.autocomplete.js
index 7051c90af..226d40605 100644
--- a/ui/jquery.ui.autocomplete.js
+++ b/ui/jquery.ui.autocomplete.js
@@ -186,9 +186,6 @@ $.widget( "ui.autocomplete", {
 				self._change( event );
 			});
 		this._initSource();
-		this.response = function() {
-			return self._response.apply( self, arguments );
-		};
 		this.menu = $( "<ul></ul>" )
 			.addClass( "ui-autocomplete" )
 			.appendTo( this.document.find( this.options.appendTo || "body" )[0] )
@@ -326,18 +323,11 @@ $.widget( "ui.autocomplete", {
 					url: url,
 					data: request,
 					dataType: "json",
-					context: {
-						autocompleteRequest: ++requestIndex
-					},
 					success: function( data, status ) {
-						if ( this.autocompleteRequest === requestIndex ) {
-							response( data );
-						}
+						response( data );
 					},
 					error: function() {
-						if ( this.autocompleteRequest === requestIndex ) {
-							response( [] );
-						}
+						response( [] );
 					}
 				});
 			};
@@ -380,10 +370,26 @@ $.widget( "ui.autocomplete", {
 		this.element.addClass( "ui-autocomplete-loading" );
 		this.cancelSearch = false;
 
-		this.source( { term: value }, this.response );
+		this.source( { term: value }, this._response() );
+	},
+
+	_response: function() {
+		var that = this,
+			index = ++requestIndex;
+
+		return function( content ) {
+			if ( index === requestIndex ) {
+				that.__response( content );
+			}
+
+			that.pending--;
+			if ( !that.pending ) {
+				that.element.removeClass( "ui-autocomplete-loading" );
+			}
+		};
 	},
 
-	_response: function( content ) {
+	__response: function( content ) {
 		if ( content ) {
 			content = this._normalize( content );
 		}
@@ -395,10 +401,6 @@ $.widget( "ui.autocomplete", {
 			// use ._close() instead of .close() so we don't cancel future searches
 			this._close();
 		}
-		this.pending--;
-		if ( !this.pending ) {
-			this.element.removeClass( "ui-autocomplete-loading" );
-		}
 	},
 
 	close: function( event ) {
-- 
2.39.5