selec2搜索-如果特定条件不匹配，则返回未找到结果消息 [英] selec2 search - Return no results found message if a specific criteria didnt match

问题描述

我正在使用select2 4.0.3进行搜索.根据我的理解，其默认功能与下拉菜单项的开头不匹配.所以我实现了下面给出的代码

I am using select2 4.0.3 for search drop down. As per my understanding its default functionality is not to match with the start of entries the drop down have. So I have implemented the below given code

function matchStart(params, data) {
    params.term = params.term || '';
    if (data.text.toUpperCase().indexOf(params.term.toUpperCase()) == 0) {
        return data;
    }
    return false;
}

$("select").select2({
    placeholder : "Input country name or select region",
    matcher : function (params, data) {
        return matchStart(params, data);
    },
});

我的问题是，即使没有找到匹配的结果，下拉列表也不会显示找不到结果"消息.谁能帮我这个忙.

My problem is, the dropdown is not showing "No results found" message even if there is no matching results found. Can anyone help me on this.

谢谢.

推荐答案

尝试将matchStart的返回值从false更改为null.

Try changing the return value of matchStart from false to null.

此外，您可以删除matcher参数周围的额外功能.结果:

Also you can remove the extra function around the matcher argument. The result:

function matchStart(params, data) {
    params.term = params.term || '';
    if (data.text.toUpperCase().indexOf(params.term.toUpperCase()) == 0) {
        return data;
    }
    return null;
}

$("select").select2({
    placeholder: "Input country name or select region",
    matcher: matchStart
});

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