无法读取 jquery 中未定义的属性 'join'

Question

我的urllink是这样http://localhost:50255/product/filter/manufacturer/3

在文档加载时，我尝试像这样设置 manufacturer 3 值

$(window).load(function(){
    var pathname = window.location.pathname.split("/");
    var filter = pathname[pathname.length-3];
            if(filter === 'filter'){
                var option = pathname[pathname.length-2];
                var id = pathname[pathname.length-1];
                $("#ManufacturerID").val(id).trigger("change");
            }
        });

但我收到错误

Cannot read property 'join' of undefined

我的 html 标记是

  <div class="select2-container select2-container-multi js-example-basic-multiple col-sm-12" id="s2id_ManufacturerID" style="border: 1px solid rgba(0, 0, 0, 0.14902); display: block;">
         <ul class="select2-choices">  
           <li class="select2-search-field">    
           <label for="s2id_autogen6" class="select2-offscreen"></label>    
           <input type="text" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" class="select2-input select2-default" id="s2id_autogen6" placeholder="" style="width: 1004px;">  
           </li>
         </ul>
       <div class="select2-drop select2-drop-multi select2-display-none select2-drop-active">   
         <ul class="select2-results">   
           <li class="select2-no-results">No matches found</li>
         </ul>
       </div>
    </div>


    <select id="ManufacturerID" class="js-example-basic-multiple col-sm-12" multiple="multiple" placeholder="Κατασκευαστές" style="border: 1px solid rgba(0, 0, 0, 0.14902); display: none;" tabindex="-1">
         <option value="1">manufacturer 1</option>
         <option value="2">manufacturer 2</option>
         <option value="3">manufacturer 3</option>
    </select>

我做错了什么？

UPDATE 感谢评论，错误来自以下函数

$(function () {
            $('select').select2()
            .on("change", function (e) {
                var id = '#sel' + $(this).attr("id");
                var array = e.val.join(",");
                $(id).val(array);
                PostIt();
            })
        });

Answer 1

我认为您的问题是 e.val 未定义。尝试将其替换为 e.target.value

无法读取 jquery 中未定义的属性 'join'

Cannot read property 'join' of undefined in jquery

javascript

jquery

select2

无法读取 jquery 中未定义的 属性 'join'

Cannot read property 'join' of undefined in jquery

javascript

jquery

select2

无法读取 jquery 中未定义的属性 'join'