选择框和复选框在ajax中不起作用

Question

<select id="multi-select-demo" multiple="multiple"> 
</select>

在下面的代码中，我们想通过ajax分配动态选项值，但是它不起作用

$.ajax({
  type: 'POST',
  url: 'get_checkparishdata',
  data: { "campids": optionValue },
  success: function (data2) {
    new_data2 = data2;
    if (new_data2 == '<option>No Record Found</option>') {
      $(".bootparish").html(new_data2);
      $("#multi-select-demo").html(new_data2);
      $('#multi-select-demo').multiselect();
    } else {
      $(".bootparish").html(new_data2);
      $("#multi-select-demo").html(new_data2);
    }
  }
});

//要分配动态选项值

$option_parish = '';
foreach($datapar as $Jurisdiction_parish)
{               
$option_parish.='<option value="'.$Jurisdiction_parish.'" 
selected>'.$Jurisdiction_parish.'</option>';
}   
return $option_parish;