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javascript - 未捕获的类型错误：无法读取 select2 中 null 的属性“替换”

问题描述

我select2在 node express 应用程序中使用，当我提供一个数组作为数据源时，data: dataBase我得到了错误Uncaught TypeError: Cannot read property 'replace' of null。

我尝试使用 ajax 源作为数据，它可以工作，但数据在输入时没有被过滤（这在下面被注释掉） -似乎匹配只适用于数组数据：

matcher 仅适用于本地提供的数据（例如，通过数组！使用远程数据集时，Select2 期望返回的结果已经在服务器端过滤。

我现在正在从ajaxGET 调用构建一个数组：$.getJSON('/api/skills/all')，然后在我的select2调用中将其作为数据源提供：

$(document).ready(function() {

    // Pre-populate search bar with selected items
    var skillsSelect = $('.select2-input');
    $.getJSON('/api/skills/user/')
    .then(function (selected) {
        for(var s of selected){
            var option = new Option(s.text, s.id, true, true);
            console.log(option)
            skillsSelect.append(option).trigger('change.select2');
        }
        skillsSelect.trigger({
            type: 'select2:select',
            params: {
                data: selected
            }
        });
    })
    .catch(function(err){
        console.log("$.getJSON('/api/skills/user/') failed " + err)
    })

    var dataBase=[];

    $.getJSON('/api/skills/all')
    .done(function(response) {
        console.log(".done response: " + JSON.stringify(response))
    })
    .fail(function(err){
        console.log("$.getJSON('/api/skills/all') failed " + err)
    })
    .then(function(alldata){

        $.each(alldata, function(i, skill){
            dataBase.push({id: skill._id, text: skill.skill})
        })

        console.log(".then dataBase: " + JSON.stringify(dataBase));


        $('.select2-container')
            .select2({

                data: dataBase,

                placeholder: 'Start typing to add skills...',
                width: 'style',
                multiple: true,

                createTag: function(tag) {
                    return {
                        id: tag.term,
                        text: tag.term.toLowerCase(),
                        isNew : true
                    };
                },

                tags: true,
                tokenSeparators: [',', '.']
            })
    })
});

console.log(".then dataBase: " + JSON.stringify(dataBase));印刷：

.then dataBase: [
{"id":"5c9742d88aab960fa7ca3d22","text":"perl"},{"id":"5c9742e18aab960fa7ca3d23","text":"python"},{"id":"5c9744b9f042ad10ae6240b7","text":"drinking coffee"},{"id":"5c974be7fdae0712996657a4","text":"communication"},{"id":"5c974df73957e012afdd2591","text":"data analysis"},{"id":"5c979fcdbd5d082e0a5f6930","text":"reading"},{"id":"5c97bdd5500aa73961237dc9","text":"analysis"},{"id":"5c97bea16daa4639b441abe8","text":"writing"}
]

这是错误的堆栈跟踪：

select2.full.js:4928 Uncaught TypeError: Cannot read property 'replace' of null
    at stripDiacritics (select2.full.js:4928)
    at matcher (select2.full.js:4964)
    at DecoratedClass.SelectAdapter.matches (select2.full.js:3411)
    at HTMLOptionElement.<anonymous> (select2.full.js:3271)
    at Function.each (jquery.js:354)
    at jQuery.fn.init.each (jquery.js:189)
    at DecoratedClass.SelectAdapter.query (select2.full.js:3262)
    at DecoratedClass.Tags.query (select2.full.js:3700)
    at DecoratedClass.<anonymous> (select2.full.js:598)
    at DecoratedClass.Tokenizer.query (select2.full.js:3803)

这是什么功能：

function stripDiacritics (text) {
    // Used 'uni range + named function' from http://jsperf.com/diacritics/18
    function match(a) {
        return DIACRITICS[a] || a;
    }
    return text.replace(/[^\u0000-\u007E]/g, match);
}

我正在使用 select2 v4.0.6：

https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.1/js/select2.full.js

标签： javascriptajaxjquery-select2

解决方案

您告知的部分没有问题，可能是您的 jquery 位置或超时，您得到的是空值：

$(document).ready(function() {
var dataBase = [
{"id":"5c9742d88aab960fa7ca3d22","text":"perl"},{"id":"5c9742e18aab960fa7ca3d23","text":"python"},{"id":"5c9744b9f042ad10ae6240b7","text":"drinking coffee"},{"id":"5c974be7fdae0712996657a4","text":"communication"},{"id":"5c974df73957e012afdd2591","text":"data analysis"},{"id":"5c979fcdbd5d082e0a5f6930","text":"reading"},{"id":"5c97bdd5500aa73961237dc9","text":"analysis"},{"id":"5c97bea16daa4639b441abe8","text":"writing"}
];
    $('.select2-container').select2(
{

                data: dataBase,

                placeholder: 'Start typing to add skills...',
                width: 'style',
                multiple: true,

                createTag: function(tag) {
                    return {
                        id: tag.term,
                        text: tag.term.toLowerCase(),
                        isNew : true
                    };
                },

                tags: true,
                tokenSeparators: [',', '.']
            }
);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.0/css/select2.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.6-rc.1/js/select2.full.js"></script>

<select class="select2-container" style="width:200px;">

</select>

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