How to display error prompts in yii2

In Yii2, there are two main ways to display error prompts. One is to use Yii::$app->errorHandler->exception() to automatically catch and display errors when an exception occurs. Another is to use $this->addError(), which displays an error when model validation fails and can be accessed in the view through $model->getErrors(). In the view, you can use if ($errors = $model->getErrors()) to display the error list, or use Yii2's ActiveForm widget to automatically display model verification errors.

Error prompt is displayed in Yii2

In Yii2, there are two main ways to display error prompts:

1. Use Yii::$app->errorHandler->exception()

This is the most common way to display error prompts when an exception occurs. It uses a pre-configured error handler that can automatically catch and display exceptions.

 try {
    // Execute code that may throw an exception} catch (\Exception $e) {
    Yii::$app->errorHandler->exception($e);
}

2. Use $this->addError()

This method can be used to display error prompts when model verification fails. It creates an error in the model and can be accessed in the view via echo $model->getErrors() .

 public function rules()
{
    Return [
        [['name'], 'required'],
        [['email'], 'email'],
    ];
}

public function validate($attributeNames = null, $clearErrors = true)
{
    if (parent::validate($attributeNames, $clearErrors)) {
        // Verification is successful } else {
        // Verification failed, error message is displayed $this->addError('name', 'Name is required.');
        $this->addError('email', 'Email is not valid.');
    }
    return $this->hasErrors();
}

Error prompts are displayed in the view

In the view, you can display an error message like this:

 <?php if ($errors = $model->getErrors()): ?>
    

• = $error ?>

Alternatively, you can use the built-in ActiveForm widget in Yii2, which will automatically display model validation errors:

 <?php echo $form->field($model, 'name')->error();

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