jquery - 当预告猎犬远程返回零结果时如何捕获事件

我正在使用带有猎犬建议引擎的twitter typeahead，一切正常。以下是我的代码段

// instantiate the bloodhound suggestion engine
     var searchData = new Bloodhound({
            datumTokenizer: function(d) {
                return Bloodhound.tokenizers.whitespace(d.value);
            },
            queryTokenizer: Bloodhound.tokenizers.whitespace,
            remote: {
            url: '<?php echo 'http://localhost/project1/perform/find?q=%QUERY'; ?>',
               filter: function (data) {
                    return $.map(data.results, function (record) {
                        return {
                            title: record.title,
                            pageURL: record.pageURL
                        };
                    });
                }
            }
        });

        // initialize the bloodhound suggestion engine
        searchData.initialize();
        searchData.clearRemoteCache();

        // instantiate the typeahead UI
        $('#find').typeahead({
            hint:false,
            highlight: true,
            minLength: 3
            }, {
            name:'search-data',
            displayKey: 'title',
            source: searchData.ttAdapter(),
            templates: {
             empty:[
               '<strong>No Results Found.</strong>'
             ],
             suggestion: Handlebars.compile('<p>{{title}}</p>')
           }
        }).on('typeahead:selected', function (e, suggestion) {
            setTimeout(function(){document.location = suggestion.pageURL;}, 500);
        }).on('typeahead:closed', function (e){
          $loadingImg.hide();
       });

我想执行一些操作，例如显示发布按钮等，当远程服务器返回零结果时，如何捕获此事件？

最佳答案

我不知道以下方法是否正确（如果错误，请纠正我）

        filter: function (data) {
             if(data.results.length){
               console.log('results found'); //do something
              }else{
                console.log('results not found'); //do something
              }

            return $.map(data.results, function (record) {
                    return {
                        title: record.title,
                        pageURL: record.pageURL
                    };
                });
            }