The core process of creating a form in the Yii framework includes four steps: 1. Create a model class, define fields and validation rules; 2. Process the form submission and verification logic in the controller; 3. Render form elements in the view using ActiveForm; 4. Pay attention to CSRF protection, layout and style configuration. The model class sets the required items and data formats through the rules() method. The controller uses load() and validate() to process the submitted data. The view uses ActiveForm to automatically generate input boxes with labels and error prompts, and can customize the layout and styles, thereby achieving a complete form system.
Creating forms in the Yii framework is mainly done through the cooperation of model (Model), view (View) and ActiveForm components. The core process is to define model fields, set validation rules, and then use ActiveForm in the view to generate HTML forms.
1. Create a model class
Forms usually bind a model class, which is responsible for data processing and verification. You can create it manually or automatically generate it with Gii.
// models/ContactForm.php
namespace app\models;
use Yii;
use yii\base\Model;
class ContactForm extends Model
{
public $name;
public $email;
public $subject;
public $body;
public function rules()
{
Return [
[['name', 'email', 'subject', 'body'], 'required'],
['email', 'email'],
];
}
}This defines a simple contact form model, and sets up required items and email format verification.
2. Process the commit logic in the controller
You need to write a controller action to receive form data and process it accordingly:
// controllers/SiteController.php
public function actionContact()
{
$model = new ContactForm();
if ($model->load(Yii::$app->request->post()) && $model->validate()) {
// The data is valid, perform subsequent operations, such as sending an email Yii::$app->session->setFlash('success', 'Thanks for your feedback!');
return $this->refresh();
}
return $this->render('contact', ['model' => $model]);
} The key point here is that load() method will fill the POST data into the model attributes, and validate() will perform verification based on rules.
3. Render the view using ActiveForm
Using ActiveForm in a view file makes it easy to generate form elements with tags, input boxes, and error prompts:
<?php $form = \yii\widgets\ActiveForm::begin(); ?>
<?= $form->field($model, 'name') ?>
<?= $form->field($model, 'email') ?>
<?= $form->field($model, 'subject') ?>
<?= $form->field($model, 'body')->textarea(['rows' => 6]) ?>
<div class="form-group">
<?= \yii\helpers\Html::submitButton('Submit', ['class' => 'btn btn-primary']) ?>
</div>
<?php \yii\widgets\ActiveForm::end(); ?>-
field()method will automatically add label and error prompts. - Additional configurations can be added through chain calls, such as textarea to set the number of rows.
4. Frequently Asked Questions and Precautions
- CSRF protection : Yii automatically adds CSRF tokens in ActiveForm by default, no additional processing is required.
- Form layout : The default is vertical layout. If you need horizontal layout, you can pass in
'options' => ['class' => 'form-horizontal']and match the Bootstrap style. - Custom field styles :
- Class can be explicitly set with
->textInput(['class' => 'form-control']). - Or control the appearance through the CSS class name uniformly.
- Class can be explicitly set with
Basically that's it. Yii's ActiveForm is very powerful and well packaged. As long as you are familiar with the process of model controller view, you can quickly build a complete form system.
The above is the detailed content of How do I create forms in Yii?. For more information, please follow other related articles on the PHP Chinese website!
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