下拉框

    <div class="form-control-dropdown">
    <span class="form-control-dropdown-btn">
    <i></i>
    </span>
    <div class="form-control-dropdown-value" title="请选择一个选项" aria-expanded="false">请选择一个选项</div>
    <ul class="form-control-dropdown-menu  id="j-dropdown-ul"">
    <li title="option one">
    option one
    </li>
    <li title="option two">
    option two
    </li>
    <li title="option three">
    option three
    </li>
    </ul>
    </div>

    <button class="btn primary" id="j-select-menu">默认选中</button>

    <script>
     // 默认选中
        $('#j-select-menu').on('click', function(){
            $('#j-dropdown-ul li').eq(1).trigger('click')
          })
        // 默认选中第一个
        $('#j-dropdown-ul li').eq(0).trigger('click')
    </script>

    
        <input type="text" data-toggle="dropdown" class="form-control" id="form-control-example8" placeholder="请出入文字" value="" aria-expanded="true">

        <ul class="form-control-dropdown-menu"> ...
    

   $(element).on('selected.ui.dropdown', function(e, obj){});
                            

<input type="text" data-toggle="dropdown" data-auto="bank" class="form-control" id="form-control-example" placeholder="请出入文字" value="">