Recently, when developing using the Laravel framework, I encountered some error handling problems with the registration form. In this article, I'll share how I used Laravel's form validation and error handling features to resolve these errors to help other developers better handle errors with their registration forms.

First, we need to understand the form validation and error handling mechanism in Laravel. In Laravel, we can use the Validator class to validate form data. The validator can verify whether the input data meets the specified conditions, such as required fields, email format, password length, etc. If the input data does not meet the specified conditions, the validator returns an array of errors. We can use the withErrors() method to store error information into Session, and then display the error information in the view. Next, let’s see how to implement this functionality in Laravel.

First, we need to create a validator in the registration controller. We can use the Artisan command make:validator to create a validator. For example:

php artisan make:validator RegisterValidator

This will create a validator named RegisterValidator in the app/Validators directory. Then we need to set up validation rules and error messages. Open the RegisterValidator class and add the following code:

<?php

namespace AppValidators;

use IlluminateValidationValidator;

class RegisterValidator extends Validator
{
    protected $messages = [
        'name.required' => '請(qǐng)輸入用戶名。',
        'name.max' => '用戶名不能超過255個(gè)字符。',
        'email.required' => '請(qǐng)輸入郵箱地址。',
        'email.email' => '請(qǐng)輸入有效的郵箱地址。',
        'email.unique' => '該郵箱已經(jīng)被注冊。',
        'password.required' => '請(qǐng)輸入密碼。',
        'password.min' => '密碼長度不能小于6個(gè)字符。',
        'password_confirmation.required' => '請(qǐng)輸入確認(rèn)密碼。',
        'password_confirmation.same' => '兩次輸入的密碼不一致。',
    ];

    public function validateConfirmPassword($attribute, $value, $parameters)
    {
        $other = $this->getValue($parameters[0]);
        return isset($other) && strcmp($value, $other) === 0;
    }
}

In the above code, we define some common validation rules and error messages. If the user does not enter the required fields or the input format is incorrect, the corresponding error message will be displayed. In addition, we also define a custom validation rule validateConfirmPassword to verify whether the passwords entered twice are consistent. Next, add the following code in the registration controller:

<?php

namespace AppHttpControllers;

use AppUser;
use IlluminateHttpRequest;
use IlluminateSupportFacadesValidator;
use AppValidatorsRegisterValidator;

class RegisterController extends Controller
{
    public function showRegistrationForm()
    {
        return view('auth.register');
    }

    public function register(Request $request)
    {
        // 驗(yàn)證表單數(shù)據(jù)
        $validator = Validator::make($request->all(), [
            'name' => 'required|string|max:255',
            'email' => 'required|string|email|max:255|unique:users',
            'password' => 'required|string|min:6|confirmed',
        ]);

        // 使用自定義的 validator 類的規(guī)則驗(yàn)證數(shù)據(jù)
        $validator->setValidator(new RegisterValidator($validator->getTranslator()));

        if ($validator->fails()) {
            return redirect()->back()->withErrors($validator)->withInput();
        }

        // 創(chuàng)建用戶
        $user = User::create([
            'name' => $request->input('name'),
            'email' => $request->input('email'),
            'password' => bcrypt($request->input('password')),
        ]);

        // 登錄用戶
        auth()->login($user);

        // 跳轉(zhuǎn)到首頁
        return redirect()->intended('/');
    }
}

In the above code, we use Laravel’s built-in Validator class to validate the form data. We then call the setValidator() method to apply the rules of the custom validator class we created to validate the data. If there is an error, we store the error message into Session and redirect the user back to the form page. If the verification passes, we create the user and log him in. Finally, we redirect the user to the home page.

In the template, we can use the following code to display error information:

@if ($errors->any())
    <div class="alert alert-danger">
        <ul>
            @foreach ($errors->all() as $error)
                <li>{{ $error }}</li>
            @endforeach
        </ul>
    </div>
@endif

The above code will traverse all the error information in the $errors variable and add each Each error message is displayed as a list item.

In this article, we learned how to use form validation and error handling features in Laravel to handle registration form errors. By extending Laravel's built-in validator functionality with a custom validator class, we can easily customize rules and error messages, improving code reusability and maintainability. I hope this article can help you better handle form validation and error handling.

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