onSearchComplete receives suggestions as parameter

readme.md

@@ -32,10 +32,11 @@ The standard jquery.autocomplete.js file is around 2.7KB when minified via Closu
         * `type`: Ajax request type to get suggestions. Default: `GET`.
         * `noCache`: Boolean value indicating whether to cache suggestion results. Default `false`.
         * `onSearchStart`: `function (query) {}` called before ajax request. `this` is bound to input element.
-        * `onSearchComplete`: `function (query) {}` called after ajax response is processed. `this` is bound to input element.
+        * `onSearchComplete`: `function (query, suggestions) {}` called after ajax response is processed. `this` is bound to input element. `suggestions` is an array containing the results.
         * `onSearchError`: `function (query, jqXHR, textStatus, errorThrown) {}` called if ajax request fails. `this` is bound to input element.
         * `onInvalidateSelection`: `function () {}` called when input is altered after selection has been made. `this` is bound to input element.
         * `triggerSelectOnValidInput`: Boolean value indicating if `select` should be triggered if it matches suggestion. Default `true`.
+        * `preventBadQueries`: Boolean value indicating if it shoud prevent future ajax requests for queries with the same root if no results were returned. E.g. if `Jam` returns no suggestions, it will not fire for any future query that starts with `Jam`. Default `true`. 
         * `beforeRender`: `function (container) {}` called before displaying the suggestions. You may manipulate suggestions DOM before it is displayed.
         * `tabDisabled`: Default `false`. Set to true to leave the cursor in the input field after the user tabs to select a suggestion.
         * `paramName`: Default `query`. The name of the request parameter that contains the query.

spec/autocompleteBehavior.js

@@ -136,12 +136,15 @@ describe('Autocomplete', function () {
     it('Should execute onSearchComplete', function () {
         var input = document.createElement('input'),
             completeQuery,
+            mockupSuggestion = { value: 'A', data: 'A' },
+            resultSuggestions,
             ajaxExecuted = false,
             url = '/test-completed',
             autocomplete = new $.Autocomplete(input, {
                 serviceUrl: url,
-                onSearchComplete: function (query) {
+                onSearchComplete: function (query, suggestions) {
                     completeQuery = query;
+                    resultSuggestions = suggestions;
                 }
             });
 
@@ -153,7 +156,7 @@ describe('Autocomplete', function () {
                 var query = settings.data.query,
                     response = {
                         query: query,
-                        suggestions: []
+                        suggestions: [mockupSuggestion]
                     };
                 this.responseText = JSON.stringify(response);
             }
@@ -169,6 +172,8 @@ describe('Autocomplete', function () {
         runs(function () {
             expect(ajaxExecuted).toBe(true);
             expect(completeQuery).toBe('A');
+            expect(resultSuggestions[0].value).toBe('A');
+            expect(resultSuggestions[0].data).toBe('A');
         });
     });
 
@@ -597,4 +602,56 @@ describe('Autocomplete', function () {
 
         expect(instance.suggestions.length).toBe(limit);
     });
-});
+
+    it('Should prevent Ajax requests if previous query with matching root failed.', function () {
+        var input = $('<input />'),
+            instance,
+            serviceUrl = '/autocomplete/prevent/ajax',
+            ajaxCount = 0;
+
+        input.autocomplete({
+            serviceUrl: serviceUrl
+        });
+
+        $.mockjax({
+            url: serviceUrl,
+            responseTime: 5,
+            response: function (settings) {
+                ajaxCount++;
+                var response = { suggestions: [] };
+                this.responseText = JSON.stringify(response);
+            }
+        });
+
+        input.val('Jam');
+        instance = input.autocomplete();
+        instance.onValueChange();
+
+        waits(10);
+
+        runs(function (){
+            expect(ajaxCount).toBe(1);
+            input.val('Jama');
+            instance.onValueChange();
+        });
+
+        waits(10);
+
+        runs(function (){
+            // Ajax call should not have bee made:
+            expect(ajaxCount).toBe(1);
+
+            // Change setting and continue:
+            instance.setOptions({ preventBadQueries: false });
+            input.val('Jamai');
+            instance.onValueChange();
+        });
+
+        waits(10);
+
+        runs(function (){
+            // Ajax call should have been made:
+            expect(ajaxCount).toBe(2);
+        });
+    });
+});

src/jquery.autocomplete.js

@@ -76,6 +76,7 @@
                 dataType: 'text',
                 currentRequest: null,
                 triggerSelectOnValidInput: true,
+                preventBadQueries: true,
                 lookupFilter: function (suggestion, originalQuery, queryLowerCase) {
                     return suggestion.value.toLowerCase().indexOf(queryLowerCase) !== -1;
                 },
@@ -473,19 +474,19 @@
                 that = this,
                 options = that.options,
                 serviceUrl = options.serviceUrl,
-                data,
+                params,
                 cacheKey;
 
             options.params[options.paramName] = q;
-            data = options.ignoreParams ? null : options.params;
+            params = options.ignoreParams ? null : options.params;
 
             if (that.isLocal) {
                 response = that.getSuggestionsLocal(q);
             } else {
                 if ($.isFunction(serviceUrl)) {
                     serviceUrl = serviceUrl.call(that.element, q);
                 }
-                cacheKey = serviceUrl + '?' + $.param(data || {});
+                cacheKey = serviceUrl + '?' + $.param(params || {});
                 response = that.cachedResponse[cacheKey];
             }
 
@@ -501,20 +502,26 @@
                 }
                 that.currentRequest = $.ajax({
                     url: serviceUrl,
-                    data: data,
+                    data: params,
                     type: options.type,
                     dataType: options.dataType
                 }).done(function (data) {
+                    var result;
                     that.currentRequest = null;
-                    that.processResponse(data, q, cacheKey);
-                    options.onSearchComplete.call(that.element, q);
+                    result = options.transformResult(data);
+                    that.processResponse(result, q, cacheKey);
+                    options.onSearchComplete.call(that.element, q, result.suggestions);
                 }).fail(function (jqXHR, textStatus, errorThrown) {
                     options.onSearchError.call(that.element, q, jqXHR, textStatus, errorThrown);
                 });
             }
         },
 
         isBadQuery: function (q) {
+            if (!this.options.preventBadQueries){
+                return false;
+            }
+
             var badQueries = this.badQueries,
                 i = badQueries.length;
 
@@ -637,18 +644,17 @@
             return suggestions;
         },
 
-        processResponse: function (response, originalQuery, cacheKey) {
+        processResponse: function (result, originalQuery, cacheKey) {
             var that = this,
-                options = that.options,
-                result = options.transformResult(response, originalQuery);
+                options = that.options;
 
             result.suggestions = that.verifySuggestionsFormat(result.suggestions);
 
             // Cache results if cache is not disabled:
             if (!options.noCache) {
                 that.cachedResponse[cacheKey] = result;
-                if (result.suggestions.length === 0) {
-                    that.badQueries.push(cacheKey);
+                if (options.preventBadQueries && result.suggestions.length === 0) {
+                    that.badQueries.push(originalQuery);
                 }
             }