Data echo method based on layui drop-down list

 <div class="layui-form-item">
  <label class="layui-form-label">Select box</label>
  <div class="layui-input-block">
   <select  name="quiz2">
    <option value="">Please select a city</option>
    <option value="2">Hangzhou2</option>
    <option value="3">Hangzhou3</option>
    <option value="4">Hangzhou4</option>
    <option value="5">Hangzhou5</option>
   </select>
  </div>
 </div>

<script>
  // traversal select  $("#t").each(function() {
    // This represents <option></option>, and then traverse the option    $(this).children("option").each(function() {
      // Determine which option needs to be echoed      if ( == 2) {
        ($(this).text());
        // Echo        $(this).attr("selected","selected");
      }
    });
  })
&lt;/script&gt;

public String getApiInfoByTypePage(@PathVariable String type, Model model, HttpServletRequest request) {
    List<DopApiType> typeList1 = (1);
    (typeList1);
    ("typeList1", typeList1);
}

<div class="layui-input-inline">
      <select  name="quiz1" lay-filter="quiz1">
        <option value="1">Please select the first-level service directory</option>
        <option th:each="list1:${typeList1}" th:value="${}" th:text="${ }"></option>
      </select>
    </div>
    <div class="layui-input-inline" lay-filter="inline1">
      <select  name="quiz2" lay-filter="quiz2">
        <option value="0">Please select the secondary service directory</option>
      </select>
    </div>

 //Select time of listening to the drop-down list of first-level service directory    ('select(quiz1)', function (data) {
      
      var pId = ;// id of the first-level list      $.post('/getApiTypeByPid', {'pId': pId, '': 2}, function (msg) {// Request data for the secondary list        // (msg);
        $('#quiz2').empty();// Clear the contents of the secondary list for (var i in msg) {// traversal data assigned to the secondary list          var $content = $('<option value="' + msg[i].typeId + '">' + msg[i].typeName + '</option>');
          $('#quiz2').append($content);
        }
        ('select');// Note: After the data assignment is completed, this method must be called to render the layout, otherwise the data will not be released.      });
    });

// Data echo in the service directory    var sesType = [[${type}]];
    var sesType1 = [[${type1}]];// Level 1 directory id    var sesStatus = [[${status}]];
    // Level 1 directory echo    $("#quiz1").each(function () {// traversal select $(this).children("option").each(function () {// traversal option        if ( == sesType1) {// The same id as the background, the selected displays          // ("First-level directory" + $(this).text());          $(this).attr("selected", "selected");
          $.post('/getApiTypeByPid', {'pId': sesType1, '': 2}, function (msg) {// Obtain information of the secondary directory based on the id of the primary directory            // (msg);
            $('#quiz2').empty();// Clear for (var i in msg) { // traversal and assign values              if (msg[i].typeId == sesType) {//Judge the secondary directory to be echoed                var $content1 = $('<option value="' + msg[i].typeId + '" selected="selected">' + msg[i].typeName + '</option>');
                $('#quiz2').append($content1);
              } else {
                var $content = $('<option value="' + msg[i].typeId + '">' + msg[i].typeName + '</option>');
                $('#quiz2').append($content);
              }
 
            }
            ('select');// Note: Be sure to call this method for central rendering, otherwise the data will not be displayed.          });
        }
      });
    });