我正在尝试验证我的表单，并使用 AJAX 将数据插入mysql数据库中。既没有进行提交验证，也没有插入数据。我在codeigniter框架中做这个。我是ajax的新手。我不能找出哪里出错了。下面是我的代码
查看方式：

<script  type="text/javascript">
      function validate_name(first_name){
        if(first_name.trim() == '' || first_name.length == 0){
        $('.first_name').show();
         $('.first_name').text('Please enter your name');
         return false;
    } else {
      $('.first_name').hide();
      return true;
    }
  }

  function validate_email(email_id){
    var pattern = new RegExp(/^[+a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/i);

    if(email_id.trim() == '' || email_id.length == 0){
      $('.email-id').show();
      $('.email-id').text('Please enter email address');
      return false;
    }else if(!pattern.test(email_id)) {
      $('.email-id').show();
      $('.email-id').text('Please enter valid email address');
      return false;
    } else {
      $('.email-id').hide();
      return true;
    }
  }

  function validate_inquiry_form(first_name,email_id){
    var username_validate = validate_name(first_name);
    var email_validate = validate_email(email_id);

    if(username_validate == true && email_validate == true){
      return true;
    } else {
      return false;
    }
  }

  $('#submit_enquiry').click(function(){

      var first_name      = $("input[name=first_name]").val();
      var last_name       = $("input[name=last_name]").val();
      var dob             = $("input[name=dob]").val(); 
      var gender          = $("input[name=gender] :radio:checked").val();
      var email_id        = $("input[name=email_id]").val();
      var password        = $("input[name=password]").val();
      var address         = $("input[name=address]").val();
      var phone           = $("input[name=phone]").val();
      var zipcode         = $("input[name=zipcode]").val();

      var validate_form = validate_inquiry_form(first_name,email_id);
      if(validate_form == true){
        $.ajax({
          url:'<?php echo base_url(); ?>member/register',
          type:'POST',
          data:{ 
                  first_name : first_name ,last_name : last_name ,dob : dob ,male : male ,female : female , email_id : email_id ,password : password ,phone : phone , address : address , zipcode : zipcode
               },

          success: function(data) {

            console.log(data);
          }
        });
      } else {
        return false;
      }
      return false;
  });
</script>

        <form id="registration-form">
          <div class="register">
                    <div class="row">
                          <div class="col1">
                              <label for="first_name">First Name<span>*</span></label> <br/>
                              <input type="text" name="first_name"/>
                    <li class="first_name error"></li>
                          </div>

                          <div class="col2">
                                Last Name<br/>
                                <input type="text" name="last_name"/>
                          </div>
                    </div>

                    <div class="row">
                          <div  class="col1">
                                Date Of Birth <br/>
                                <input type="text" name="dob"/>
                          </div>

                            <div  class="col2">
                              Gender
                              <br/>
                                <input type="radio" name="gender" value="Male" /> Male
                                <input type="radio" name="gender" value="Female" /> Female
                            </div>
                    </div>

                    <div class="row">
                          <div class="col1">
                                Email<br/>
                                <input type="text" name="email_id"/>
                    <li class="email-id error"></li>
                          </div>
                          <div class="col2">
                                Password<br/>
                                <input type="password" name="password"/>
                          </div>
                    </div>

                    <div class="row">
                            <div class="col">
                                  Address<br/>
                                  <textarea name="address" rows="2" ></textarea>
                            </div>
                    </div>

                    <div class="row">
                          <div class="col1">
                                Zipcode<br/>
                                <input type="text" name="zipcode"/>
                          </div>
                           <div class="col2">
                                  Phone<br/>
                                  <input type="text" name="phone"/>
                            </div>
                    </div>

                    <div class="row">
                        <div class="col3">
                          <input class="" type="button" id="submit_enquiry" name="submit_enquiry" value="Submit Enquiry" />
                        </div>
                    </div> 
          </div>
        </form>

控制器：

public function register_user()
    {
        $register_user  = $this->member_model->add_user();
        if($register_user)
        {                
            return true;
        }  
        else 
        {  
            return false;
        }
    }

产品型号：

public function add_user()
{
    $add_user = array(
                    'mem_name'=> $this->input->post('first_name'),
                    'mem_lastname'=> $this->input->post('last_name'),
                    'mem_dob'=> $this->input->post('dob'),
                    'mem_gender'=> $this->input->post('gender'),
                    'mem_email'=> $this->input->post('email_id'),
                    'mem_address'=> $this->input->post('address'),
                    'mem_zipcode'=> $this->input->post('zipcode'),
                    'mem_phone'=> $this->input->post('phone'),
                    'mem_password'=> $this->input->post('password'),

    );

    $insert = $this->db->insert('membership', $add_user);
    $insert_id = $this->db->insert_id();
    return  $insert_id;
}

请帮帮我......。