选择2不调用Ajax

Question

我正在使用jQuery select2插件并尝试通过Ajax请求显示数据。但它没有调用Ajax函数，我已经尝试了所有方法，但没有成功。这是我的代码-

html

<select class="form-control " multiple="" data-placeholder="Select Youtube Videos" aria-hidden="true"  name="collection_youtube_videos[]" id="collection_youtube_videos"></select>

Javascipt

$(document).ready(function(){
    $('#collection_youtube_videos').select2({
        ajax: {
            url: url,
            dataType: 'json',
            data: function (params) {
                var query = {
                    //trim the extra whitespace
                    search: params.term.replace(/\s+/g, " ").trim(),
                }

                // Query parameters will be ?search=[term]&type=public
                return query;
            },
            processResults: function (data) {
                // Transforms the top-level key of the response object from 'items' to 'results'
                return {
                    results: data.items
                };
            }
        }
    });
});

我使用以下版本

JQuery-2.1.4

选择2-4.0.0

问题是，当我在select2的输入框中键入内容时，它没有调用这个ajax请求来获取数据。有人能帮我吗？

Answer 1

您必须添加“select2”css类才能选择标签

<select class="form-control select2" multiple="" data-placeholder="Select Youtube Videos" aria-hidden="true"  name="collection_youtube_videos[]" id="collection_youtube_videos"></select>

Answer 2

您可以按照以下步骤更改ajax调用

检查此链接以供参考，它包含类似的问题https://stackoverflow.com/a/21602199/6429700

$(document).ready(function(){
    var url = "test.php";
    $('#collection_youtube_videos').select2({
        minimumInputLength: 2,
        tags: [],
        ajax: {
            url: url,
            dataType: 'json',
            data: function (params) {
                var query = {
                    //trim the extra whitespace
                    search: params.term.replace(/\s+/g, " ").trim(),
                }

                // Query parameters will be ?search=[term]&type=public
                return query;
            },
            processResults: function (data) {
                // Transforms the top-level key of the response object from 'items' to 'results'
                return {
                    results: data.items
                };
            }
        }
    });
});

select {
  width: 200px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.full.min.js"></script>

<select class="form-control " multiple="" data-placeholder="Select Youtube Videos" aria-hidden="true"  name="collection_youtube_videos[]" id="collection_youtube_videos"></select>