Question

我可以知道如何确保用户选择了Dr，Mr，Ms，Mdm，并且当他们提交表格时，如果称呼为空白，则会返回set_rules（）的错误消息。

代码：

echo "<p>Salutation: ";
    $salutationOptions = array(
                  ''  => '',
                  'Dr'  => 'Dr',
                  'Mr'    => 'Mr',
                  'Ms'   => 'Ms',
                  'Mdm' => 'Mdm',
                );
    echo form_dropdown('salutation', $salutationOptions, '');
    echo "</p>";

Answer 1

在视图文件中，您可以使用以下命令进行客户端验证：

echo "<p>Salutation: ";
 $salutationOptions = array(
                  ''  => '',
                  'Dr'  => 'Dr',
                  'Mr'    => 'Mr',
                  'Ms'   => 'Ms',
                  'Mdm' => 'Mdm',
                );
    echo form_dropdown('salutation', $salutationOptions, '', 'required="required"');
    echo "</p>";

当用户尝试提交而不选择表单下拉列表时，会给出错误，说明他们应该从下拉列表中选择。

如果你想在服务器端使用它，你可以这样做：

$this->form_validation->set_rules('salutation', 'Salutation', 'required')
if($this->form_validation->run()){
    /*user has selected. use the data now*/
}else{
    /*user has not sleected data, throw error back*/
}

Answer 2

在HTML中使用required或

喜欢这个

 $this->form_validation->set_rules( "Salutation","Salutation","required"); 

I hope this might help you

https://ellislab.com/codeigniter/user-guide/libraries/form_validation.html#validationrules

Answer 3

示例在视图部分：

 $options = array('0' => 'SELECT SHIRT', '1' => 'Small Shirt', '1' =>
'Medium Shirt', '2' => 'Large Shirt', '3' => 'Extra Large Shirt', );
echo form_open('welcome/index');
echo form_error('field name to display error');
echo form_dropdown('field name', $options);
echo form_submit('submit', 'submit');
echo form_close();

在控制器部分：

$this->load->helper('form_validation');
$this->form_validation->set_rules('field name', 'name have to display in the error message', 'required'); 
if ($this->form_validation->run() == false) {
$this->load->view('your page name'); }else{
$this->load->view('another page');}

Answer 4

最好用foreach（）循环。这是我遇到的方式。

justify-content: end;

Codeigniter：下拉验证set_rules

4 个答案: