javascript - 如何在codeigniter的 Controller 中调用javascript函数？

Question

我有这样的看法

<p>
   <div id="error_msg" class="alert alert-error"> //at this div have css .alert{display:none;}
      <a class="close click_close">X</a>
      <strong>oops!</strong> username atau password yang anda masukan salah
   </div>
</p>

在我的 Controller 中

public function login_form() {
    $this->form_validation->set_rules('username', 'Username', 'required|trim|xss_clean');
    $this->form_validation->set_rules('password', 'Password', 'required|md5|xss_clean');
    $this->form_validation->set_error_delimiters('<span class="error">', '</span>');

    if($this->form_validation->run()==FALSE) {
        $this->load->view('v_admin_login');
    } else {
        $username = $this->input->post('username');
        $password = $this->input->post('password');

        $cek = $this->m_admin_login->getAdmin($username, $password, 1, 1);

        if($cek <> 0) {
            $this->session->set_userdata('isLogin', TRUE);
            $this->session->set_userdata('username',$username);
            $this->session->set_userdata('level',$level);

            redirect('admin');
        } else {
            //I want to change class alert to .alert{display:block}
            //What should I do?
        }
    }
}

关键是如果输入的用户名或密码错误，我想显示带有类警报的div。

Answer 1

使用ECHO命令将javascript代码打印为字符串，但不要忘了将标记放进去。看我的例子:

<?

class Test extends CI_Controller {

    function Test() {
        parent::__construct();

    }

    function index() {

        echo "<script language=\"javascript\">alert('test');</script>";
    }
}