jQuery UI自动完成 - 没有结果消息

Question

如果没有结果,我试图在下拉菜单中显示"无结果"消息.因此,例如,如果我在文本字段中键入"ABCD",并且没有匹配的实体,则显示消息"无结果".将显示.

在通过stackoverflow查看完成此操作的各种不同方法并尝试其中一些之后,我仍然无法使其工作.

如果没有找到结果,如何在下拉菜单中添加"无结果"消息？

jQuery的:

    $element.autocomplete({
        source: function (request, response) {            
            $.ajax({
                url: thUrl + thQS,
                type: "get",
                dataType: "json",
                cache: false,
                data: {
                    featureClass: "P",
                    style: "full",
                    maxRows: 12
                },
                success: function (data) {
                    response($.map(data, function (item) {
                        if (data.indexOf(item) === -1) {
                            return { label: "No Results." }
                        } else {
                            return {
                                label: item.Company + " (" + item.Symbol + ")",
                                value: item.Company
                            }
                        }
                    }));
                }
            });
        },
        minLength: that.options.minLength,
        select: function (event, ui) {
               reRenderGrid();
        }
    });

我尝试使用以下内容添加if()语句,但这不起作用.

if (data.length === 0) {
    // Do logic for empty result.
}

如果我执行以下操作,我可以使用"无结果"文本覆盖第一个条目...

if (data.indexOf(item) === 0) {
    return { 
        label: "No Results." 
}

......但如果我data.indexOf(item) === -1没有设置任何显示.

我刚刚尝试了以下内容,当没有数据时,它进入循环,但是,"No Results"没有显示在菜单中:

   success: function (data) {
        response($.map(data, function (item) {
            return {
                label: item.Company + " (" + item.Symbol + ")",
                value: item.Company
            }
        }));
        if (data.length === 0) {
            label: "No Results."
        }
    }

我还尝试使用Andrew Whitaker的下面例子,但没有运气:

ANDREW WHITACKER'S FIDDLE:http://jsfiddle.net/J5rVP/128/

消息来源:http://blog.andrewawhitaker.com/2012/10/08/jqueryui-autocomplete-1-9/

Answer 1

if (!ui.content.length) {
    var noResult = { value:"",label:"No results found" };
    ui.content.push(noResult);
    //$("#message").text("No results found");
} 

小提琴

http://jsfiddle.net/J5rVP/129/

更新

紧接着将代码放在自动完成设置的末尾 select: function (event, ui) {..}

    ..........
    minLength: that.options.minLength,
    select: function (event, ui) {
        reRenderGrid();
    },   //HERE - make sure to add the comma after your select
    response: function(event, ui) {
        if (!ui.content.length) {
            var noResult = { value:"",label:"No results found" };
            ui.content.push(noResult);
        }
    }
});

Answer 2

修改这样的函数以检查数据的长度.

success: function (data) {
    if(!data.length){
        var result = [
            {
                label: 'No matches found', 
                value: response.term
            }
        ];
        response(result);
    }
    else{
        // normal response
        response($.map(data, function (item) {
            return {
                label: item.CompanyName + " (" + item.SymbolName + ")",
                value: item.CompanyName
            }
        }));
    }
}

Answer 3

我的回答与@neelmeg 和@Trever 几乎相同，但我添加了额外的检查，因此用户将无法选择“无结果”消息：

$(".my-textbox").autocomplete({
    minLength: 2,
    open: function () { $('.ui-autocomplete').css('z-index', 50); },
    source: function (request, response) {
        $.ajax({
            url: "/some-url",
            type: "POST",
            dataType: "json",
            data: { prefix: request.term, __RequestVerificationToken: token },
            success: function (data) {
                if (!data.length) {
                    var result = [{ label: "no results", value: response.term }];
                    response(result);
                }
                else {
                    response($.map(data, function (item) {
                        return { label: item.someLabel, value: item.someValue };
                    }))
                }
            }
        })
    },
    select: function (event, ui) {
        var label = ui.item.label;
            if (label === "no results") {
            // this prevents "no results" from being selected
            event.preventDefault();
        }
        else {
            /* do something with the selected result */
            var url = "some-url"
            window.location.href = url;
        }
    }
});