How to use form validation and error prompts in Rebet framework?

Rebet is a lightweight Web application framework based on PHP. It provides many functions to facilitate developers to quickly develop high-performance Web applications. Among them, form validation and error prompts are an important link in web application development, and are also one of the functions provided by the Rebet framework.

Form verification and error prompts are mainly used to verify whether the form data submitted by the user meets the requirements and promptly notify the user of the error information so that the user can correct the error information and resubmit.

The Rebet framework provides related components and methods for form validation and error prompts. Let’s introduce how to use these components and methods in the Rebet framework.

1. Set form validation rules

Before using the Rebet framework for form validation, you first need to customize the form validation rules. In the Rebet framework, you can use validators to define form validation rules. In the following code, we define a UserValidator to verify the form data submitted by the user:

use RebetValidationValidator;
use RebetValidationRulesRequireRule;
use RebetValidationRulesEmailRule;

class UserValidator extends Validator
{
    protected function rules() : array
    {
        return [
            'name'  => [ new RequireRule() ],
            'email' => [ new RequireRule(), new EmailRule() ],
            'phone' => [],
        ];
    }

    protected function messages() : array
    {
        return [
            'name.require'  => '请输入您的姓名',
            'email.require' => '请输入您的邮箱',
            'email.email'   => '请输入正确的邮箱地址',
        ];
    }
}

In the above code, we use two validation rules, RequireRule and EmailRule. RequireRule means that the input must not be empty, and EmailRule means that the input Must be in email format. At the same time, we have also customized some error messages. If the above rules are not met when the user fills in the form, corresponding error prompts will be given.

2. Form data verification

After you have a customized UserValidator, you can use it to verify the form data submitted by the user. In the following code example, we define a UserController to receive and verify form data submitted by users.

use RebetHttpRequest;
use RebetValidationValidationFailedException;

class UserController
{
    public function register(Request $request)
    {
        try {
            $validate = $request->validate(UserValidator::class); // 使用UserValidator来验证表单数据

            // 验证通过，进行相关操作
            $name  = $validate->get('name');
            $email = $validate->get('email');
            $phone = $validate->get('phone');

            // ...

        } catch (ValidationFailedException $e) {
            // 验证未通过，输出错误信息
            $errors = $e->getErrors();
        }
    }
}

In the above code, we used the $request->validate method to validate the user form data, and used try-catch to capture the ValidationFailedException exception. When the form data submitted by the user does not comply with the custom UserValidator rules, a ValidationFailedException will be thrown. We can obtain the error information through the $e->getErrors() method in the catch.

3. Error prompt

When the user fills in the form, if it does not meet the custom UserValidator rules, a corresponding error prompt will be given. In the Rebet framework, you can use the error prompt component (Flash) to implement error prompts, as shown in the following code:

use RebetToolsUtilityArrays;
use RebetHttpSessionFlash;

class UserController
{
    public function register(Request $request)
    {
        try {
            $validate = $request->validate(UserValidator::class);

            // 验证通过，进行相关操作
            $name  = $validate->get('name');
            $email = $validate->get('email');
            $phone = $validate->get('phone');

            // ...

        } catch (ValidationFailedException $e) {
            // 验证未通过，输出错误信息
            $errors = $e->getErrors();

            $flash = new Flash();
            Arrays::each($errors, function ($field, $errors) use ($flash) {
                $flash->error($field, $errors[0]); // 错误提示
            });

            // 返回前一页并刷新页面
            return Response::redirect()->back()->refresh();
        }
    }
}

In the above code, we use the Flash component to output error prompts. In the try-catch block, when the form verification fails, we use the $flash->error method to display the error message. At the same time, use the Redirect component to return to the previous page and refresh the page.

Summary

Through the above introduction, we have learned how to use form validation and error prompts in the Rebet framework. Through custom validation rules, form data verification, error prompts and other steps, we can easily verify the form data submitted by the user and provide error prompts, which improves the user experience of the web application and also increases the stability of the web application. and security.

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