php Codeigniter 表单验证 - 如何在成功后取消设置表单值？

Codeigniter Form Validation - how to unset form values after success?

提问by BrynJ

I realise this request goes against the example provided in the CI documentation (which advises a separate 'success' page view), but I would like to reutilise a given form view after a form has been successfully submitted - displaying a success message then displaying a blank form. I've tried a few ways unsuccessfully to clear the validation set values (unsetting $_POST, setting rules / fields to an empty array and rerunning validation).

我意识到此请求与 CI 文档中提供的示例（它建议单独的“成功”页面视图）背道而驰，但我想在成功提交表单后重新利用给定的表单视图 - 显示成功消息，然后显示空白表格。我尝试了几种方法来清除验证集值（取消设置$_POST，将规则/字段设置为空数组并重新运行验证），但均未成功。

I could redirect to the same page, but then I'd have to set a session variable to display a success message - which is a messy approach.

我可以重定向到同一页面，但随后我必须设置一个会话变量来显示成功消息 - 这是一种混乱的方法。

Any ideas how to best achieve the above?

任何想法如何最好地实现上述目标？

回答by Teej

Redirect to itself. This way, no submissions have been run... This also gives you a way to show the flash_data.

重定向到自身。这样，没有提交已经运行...这也给你一种方式来显示flash_data。

    $this->load->library('form_validation');

    $this->form_validation->set_rules('firstname', 'First Name', 'required');
    $this->form_validation->set_rules('surname', 'Sur Name', 'required');

    if ($this->form_validation->run() === TRUE)
    {
                    // save data

        $this->session->set_flashdata('message', 'New Contact has been added');
        redirect(current_url());
    }

    $this->load->view('contacts/add', $this->data);

回答by d5avard

Another solution, extend the library CI_Form_validation. The property $_field_datais protected, so we can acces it:

另一种解决方案，扩展库CI_Form_validation。该属性$_field_data受到保护，因此我们可以访问它：

class MY_Form_validation extends CI_Form_validation {

    public function __construct()
    {
        parent::__construct();
    }

    public function clear_field_data() {

        $this->_field_data = array();
        return $this;
    }
}

And call the new method. This way, you can pass data without storing data in session.

并调用新方法。这样，您可以在不将数据存储在会话中的情况下传递数据。

    class Item extends Controller
    {
        function Item()
        {
            parent::Controller();
        }

        function add()
        {
            $this->load->library('form_validation');
            $this->form_validation->set_rules('name', 'name', 'required');

            $success = false;

            if ($this->form_validation->run())
            {
                $success = true;
                $this->form_validation->clear_field_data();
            }

            $this->load->view('item/add', array('success' => $success));
        }
    }

回答by bschaeffer

Pass a TRUE/FALSE variable to your views that conditionally sets the values of the form.

将 TRUE/FALSE 变量传递给有条件地设置表单值的视图。

The Controller

控制器

if($this->form_validation->run())
{
    $data['reset'] = TRUE;
}
else
{
    $data['reset'] = FALSE:
}

$this->load->view("form", $data);

The View:

风景：

<input type="text" name="email" value="<?php echo ($reset) ? "" : set_value('email'); ?>" />

<input type="text" name="first_name" value="<?php echo ($reset) ? "" : set_value('first_name'); ?>" />

回答by Stephen Curran

The set_value function fetches its value from the Form_validation object and not from the $_POST array. The Form_validation object stores its own copy of the posted values in a variable called $_field_data.

set_value 函数从 Form_validation 对象而不是 $_POST 数组中获取其值。Form_validation 对象在一个名为 $_field_data 的变量中存储它自己的已发布值的副本。

Its a hack, but you could clear this variable after handling a successful submission :

它是一个黑客，但您可以在处理成功提交后清除此变量：

class Item extends Controller
{
    function Item()
    {
        parent::Controller();
        $this->load->model('item_model');
    }

    function add()
    {
        $this->load->library('form_validation');
        $this->form_validation->set_rules('name', 'name', 'required');

        $success = false;

        if ($this->form_validation->run())
        {
            $this->item_model->add_item($this->input->post('name'));
            $success = true;

            // Look away now. Hack coming up!
            // Clear the form validation field data
            $this->form_validation->_field_data = array();
        }

        $this->load->view('item/add', array('success' => $success));
    }
}

回答by dt teja

Hope this would be helpful. Finally I understand the whole concept of the extending the library. All you need to do is
Step 1: In this directory "application/libraries/" create a file named "MY_Form_validation.php" with the following php code

希望这会有所帮助。最后我理解了扩展库的整个概念。您需要做的就是
第 1 步：在此目录“application/libraries/”中，使用以下 php 代码创建一个名为“MY_Form_validation.php”的文件

<?php if (!defined('BASEPATH')) exit('No direct script access allowed.');
class MY_Form_validation extends CI_Form_validation {

 public function MY_Form_validation() {
    parent::__construct();
  }

  public function unset_field_data()
    {    
        unset($this->_field_data);    
    }
}

Step 2:Then use the function "unset_field_data()" in you controller. for example below:

第 2 步：然后使用unset_field_data()控制器中的功能“ ”。例如下面：

    if ($this->form_validation->run())
    {
        $this->item_model->add_item($this->input->post('name'));
        $success = true;

        $this->form_validation->unset_field_data();
    }

回答by quinny

I've found that where:

我发现在哪里：

1. there's more than one CI view-partials which make up the page and their controller methods perform validation
2. one of the validations failed and produced an error since the last page-refresh, say with an incorrectly formatted or typed input field value

1. 构成页面的 CI 视图部分不止一个，它们的控制器方法执行验证
2. 自上次页面刷新以来，其中一个验证失败并产生错误，例如格式或输入的输入字段值不正确

it isn't enough to clear only the validation-rules array, you need to clear the validation-error array too.

仅清除验证规则数组是不够的，您还需要清除验证错误数组。

To this end, I've added a method to system/libraries/Form_Validation.php, as follows:

为此，我在system/libraries/Form_Validation.php中添加了一个方法，如下：

public function clear_rules()
{
    $this->_error_array = array();
    $this->_field_data = array();
    return $this;
}

Returning $this is important if you want to chain your form-validation methods.

如果您想链接表单验证方法，则返回 $this 很重要。

回答by Bhunesh Satpada

In newer version 3.X, to clear set_value , $_POST=array()and $this->_field_data = array();in MY_Form_validation.phplibrary. try

在新版本3.X，以明确SET_VALUE，$_POST=array()并$this->_field_data = array();在MY_Form_validation.php库中。尝试

Clear form data after success codeigniter using php not jquery

使用php而不是jquery在成功codeigniter后清除表单数据

回答by pgee70

The answer from d5avard is wrong, the CI form validation should have the rules array parsed to it: If you don't do this you can use form validation with posted data, but not with over-ride data.

d5avard 的答案是错误的，CI 表单验证应该将规则数组解析为它：如果您不这样做，您可以对发布的数据使用表单验证，但不能使用覆盖数据。

save this file as Libraries/MY_Form_validation.php

将此文件保存为 Libraries/MY_Form_validation.php

    /**
     * Class MY_Form_validation
     * @description extension of the CI_Form_validation
     * @property CI_DB_query_builder db database driver
     * @property CI_Benchmark benchmark
     * @property CI_Input input
     * @property CI_Output output
     */
    class MY_Form_validation extends CI_Form_validation
    {
        /**
         * MY_Form_validation constructor.
         * @param array $rules
         */
        function __construct($rules = array())
        {
            parent::__construct($rules);
            $this->_error_prefix        = '<div class=""><p>';
            $this->_error_suffix        = '</p></div>';
        }

        /**
         * Resets the form validation class for multiple runs.
         * @param array $rules
         */
        public function initialise($rules = array())
        {
            if (count($rules) == 0 )
            {
                require (APPPATH.'config'.DIRECTORY_SEPARATOR.'form_validation.php');
                $this->_config_rules = $config;
            }
            else
            {
                $this->_config_rules = $rules;
            }
            $this->_field_data          = array();
            $this->_error_array         = array();
            $this->_error_messages      = array();
            $this->_error_prefix        = '<div class=""><p>';
            $this->_error_suffix        = '</p></div>';
            $this->error_string         = '';
        }
    }