Codeigniter单选按钮回调验证错误？

如果使用Codeigniter回调验证错误未选择性别，我想显示错误消息

我的HTML页面

---

我试了很多次。。。请帮助……

尝试使用

$this->input->post（'gender'）

而不是

$str

<?php

class Welcome extends CI_Controller {

  public function __construct() {
     parent::__construct();
     $this->load->library('form_validation');
  }

  public function index() {

    $this->form_validation->set_rules('gender', 'Gender', 'callback_gender');


    if ($this->form_validation->run() == FALSE) {

     // Load view

    } else {

     // Success Stuff
    }

  }


  public function gender() {
    if ($this->input->post('gender')) {
        return TRUE;
    } else {
        $this->form_validation->set_message( 'gender', 'Please Choose gender' );
        return FALSE;
    }
  }

}

---

尝试使用

$this->input->post（'gender'）

而不是

$str

<?php

class Welcome extends CI_Controller {

  public function __construct() {
     parent::__construct();
     $this->load->library('form_validation');
  }

  public function index() {

    $this->form_validation->set_rules('gender', 'Gender', 'callback_gender');


    if ($this->form_validation->run() == FALSE) {

     // Load view

    } else {

     // Success Stuff
    }

  }


  public function gender() {
    if ($this->input->post('gender')) {
        return TRUE;
    } else {
        $this->form_validation->set_message( 'gender', 'Please Choose gender' );
        return FALSE;
    }
  }

}

---

@罗伯特威利斯：你有表格吗？你的问题没有太多细节，先生，它起作用了。。。我遵循了你的答案，它也起作用了。。。谢谢…@RobertWillis你有表格吗？你的问题没有太多细节，先生，它起作用了。。。我遵循了你的答案，它也起作用了。。。谢谢

<?php

class Welcome extends CI_Controller {

  public function __construct() {
     parent::__construct();
     $this->load->library('form_validation');
  }

  public function index() {

    $this->form_validation->set_rules('gender', 'Gender', 'callback_gender');


    if ($this->form_validation->run() == FALSE) {

     // Load view

    } else {

     // Success Stuff
    }

  }


  public function gender() {
    if ($this->input->post('gender')) {
        return TRUE;
    } else {
        $this->form_validation->set_message( 'gender', 'Please Choose gender' );
        return FALSE;
    }
  }

}

<?php

class Welcome extends CI_Controller {

  public function __construct() {
     parent::__construct();
     $this->load->library('form_validation');
  }

  public function index() {

    $this->form_validation->set_rules('gender', 'Gender', 'callback_gender[gender]');


    if ($this->form_validation->run() == FALSE) {

     // Load view

    } else {

     // Success Stuff
    }

  }


  public function gender($str) {
    if ($str == '') {
        $this->form_validation->set_message( 'gender', 'Please Choose gender' );
        return FALSE;

    } else {
         return TRUE;
    }
  }

}