在codeigniter中使用jquery不检索选择框的值

Question

这是jquery代码，除了DistrictId，InstituteId和ComplainType之外，所有字段名都是检索到的每个元素的准确值。这些都是选择框值

使用jquery和html格式的索引文件，只检索selece框的值

$(document).ready(function() {
  $("body").on('click', '#SaveComplain', function() {
    var date = new Date();
    var n = date.toDateString();
    var t = date.toLocaleTimeString();
    var time = n + ' ' + time;
    var FocalPerson = $('#FocalPerson').val();
    var Email = $('#Email').val();
    var ContactNumber = $('#ContactNumber').val();
    var InstituteId = $('#Institute').val();
    var ComplainDate = time;
    var ComplainStatus = 'Registered';
    var ComplaintDetails = $('#ComplaintDetails').val();
    var ComplaintType = $('#ComplaintType').val();
    var DistrictId = $('#District').val();

    $.ajax({
      type: 'POST',
      dataType: 'html',
      data: ('FocalPerson=' + FocalPerson + 'Email=' + Email + '&ContactNumber=' + ContactNumber + '&InstituteId=' + InstituteId + '&ComplainDate=' + ComplainDate + '&ComplainStatus=' + ComplainStatus + '&ComplaintDetails=' + ComplaintDetails + '&ComplaintType=' + ComplaintType + '&DistrictId=' + DistrictId),
      url: "<?php echo base_url('TicketSupport/SaveComplain'); ?>",
      redirect: true,
      success: function(response) {
        $('#msg').html('Complain Registered Successfully <br> Soon You will be Contacted by the Concerned Department');
      }
    });
  });

});

<div class="tab-content">
<div class="tab-pane active" id="formcontrols">
<form name="form" method="post" action="<?php echo 
base_url('TicketSupport/SaveComplain'); ?>" class="form-horizontal">
<fieldset>

<div class="control-group"> 
   <div class="controls">
      <?php echo $this->session->flashdata('record_added'); ?>
    </div> <!-- /controls -->               
 </div> <!-- /control-group -->

 <div class="control-group">                                         
       <label class="control-label" for="lastname">District:</label>
        <div class="controls">
            <select class="form-control span3" name="District" id="District" required="required">
   <option value="">Select District</option>
   <?php
   foreach ($AllDistricts as $AllDistrict) { 
   ?>
   <option value="<?php echo $AllDistrict['DistrictId']; ?>"> <?php echo $AllDistrict['DistrictName']; ?></option>
    <?php
    }
    ?>
  </select>
        </div> <!-- /controls -->               
    </div> <!-- /control-group -->


  <div class="control-group">                                         
        <label class="control-label" for="email">Institute:</label>
        <div class="controls">
            <div id="InstituteList">
        <select class="form-control span3" name="Institute" id="Institute" required="required">
            <option value="0">Select Institute </option>
        </select>
    </div>    
        </div> <!-- /controls -->               
    </div> <!-- /control-group -->

     <div class="control-group">                                         
        <label class="control-label" for="complaintype">Complain Type</label>
        <div class="controls">
            <select class="form-control span3" name="ComplaintType" id="ComplaintType" required="required">
            <option value="Finger Print Issue">Finger Print Issue</option>
            <option value="Device Problem"> Device Issue</option>
            <option value="Internet Connectivity Issue">Internet Connectivity Issue</option>
            <option value="Other"> Other</option>
            </select>
            <textarea id="other" class="form-control" name="ComplaintType" placeholder="Describe Issue" style="display: none;" rows="3"></textarea>
        </div> <!-- /controls -->               
    </div> <!-- /control-group -->

    <div class="control-group">                                         
        <label class="control-label" for="username">Name:</label>
        <div class="controls">
            <input type="text" class="span3" id="FocalPerson" name="FocalPerson" required="required" placeholder="Enter Your Name">
        </div> <!-- /controls -->               
    </div> <!-- /control-group -->

    <div class="control-group">                                         
        <label class="control-label" for="username">Email:</label>
        <div class="controls">
            <input type="text" class="span3" id="Email" name="Email" required="required" placeholder="Enter Your Email">
        </div> <!-- /controls -->               
    </div> <!-- /control-group -->


    <div class="control-group">                                         
        <label class="control-label" for="contactnumber">Contact Number:</label>
        <div class="controls">
            <input type="text" class="span3" id="ContactNumber" name="ContactNumber" required="required" placeholder="Enter Contact Number">
        </div> <!-- /controls -->               
    </div> <!-- /control-group -->

    <div class="control-group">                                         
        <label class="control-label" for="complaindetails">Details</label>
        <div class="controls">
            <textarea class="form-control span6" rows="5" name="ComplaintDetails" id="ComplaintDetails" required="required"></textarea>
        </div> <!-- /controls -->               
    </div> <!-- /control-group -->

    <div class="form-actions">
        <input type="submit" class="btn btn-primary" value="Submit" name="SaveComplain" id="SaveComplain">
        <input type="reset" class="btn" value="Reset" >
    </div> <!-- /form-actions -->
</fieldset>

这是我的控制器文件

public function SaveComplain(){

    $Record = array(
   'FocalPerson' => $this->input->post('FocalPerson'),
   'Email' => $this->input->post('Email'),
   'ContactNumber' => $this->input->post('ContactNumber'),
   'InstituteId' => $this->input->post('InstituteId'),
   'ComplainDate' => date('Y-m-d H:i:s'),
   'ComplainStatus' => 'Registered',
   'ComplainDetail' => $this->input->post('ComplaintDetails'),
   'ComplainType' => $this->input->post('ComplaintType'),
   'DistrictId' => $this->input->post('DistrictId'),
   );

    print_r($Record);
    die();

那就是结果

Array ( [FocalPerson] => someone [Email] => someone@mail.com [ContactNumber] => 123456789 [InstituteId] => [ComplainDate] => 2017-12-21 07:08:24 [ComplainStatus] => Registered [ComplainDetail] => this is complain detail [ComplainType] => [DistrictId] => )