The data validation provided by laravel has multiple methods, and each validation rule is separated by "|".

Validation rules

csrf processing of forms and ajax

Form processing: {{csrf_field()}}

ajax processing: {{csrf_token}}

Note: form processing and ajx submission processing are different. The difference is that the form processing will generate an additional hidden field for storing token s.

Let's create the controller and page first

1. Use the controller $this - > validate to validate the form

2. Validate forms independently

3. Verifier

1. Use $this - > validate to validate the form

What if the incoming request parameter does not pass the given validation rule? As mentioned earlier, Laravel will automatically redirect the user to the previous location. In addition, all validation error messages will be automatically stored in the session.

Again, we don't have to explicitly bind the error message to the view in the GET route. Because Lavarel will check the error information in the Session data and automatically bind it to the view (if the view file exists). The variable $errors is an instance of Illuminate\Support\MessageBag. The errors variable is bound to the view by the Illuminate\View\Middleware\ShareErrorsFromSession middleware provided by the Web middleware group. When this middleware is applied, you can GET the $error variable in your view, which can make you assume that the $errors variable exists and can be used safely.

As shown below:

$input = $this->validate(
            $request,
            [
                'username' => 'required|between:2,6',
                'password' => 'required|confirmed',
                'password_confirmation' => 'required',
                'email' => 'email',
            ]
        );

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

If you want to customize the prompt, define the third parameter

$input = $this->validate(
            $request,
            [
                'username' => 'required|between 2,6',
                'password' => 'required|confirmed',
                'password_confirmation' => 'required',
                'email' => 'required|email',
            ],
            [
                'username.required' => 'Account number cannot be empty',
                'username.between' => 'Account number must be 2-6 Between characters',
                'password.required' => 'Password cannot be empty',
                'password.confirm' => 'The two passwords are inconsistent',
                'password_confirmation.required' => 'Confirm password cannot be empty',
                'email.required' => 'email Cannot be empty',
                'email.email' => 'email Incorrect format',
            ]
        );

Only when the data meets the conditions, it will continue to be executed later. Assign it to input, as shown in the figure

Later, we can carry out subsequent operations. We can add the old function to leave the qualified options

2. Independent verification form

Usage scenario: if you don't want to use the {validate} method on the request and want to jump, you can use} Validator facade Manually create a validator example.

Use Validator facade Create a verifier example using the make method on:

$validator = Validator::make(
         $request->all(),
           [
               'username' => 'required|between:2,6',
               'password' => 'required|confirmed',
               'password_confirmation' => 'required',
               'email' => 'required|email',
           ],
           [
               'username.required' => 'Account number cannot be empty',
               'username.between' => 'Account number must be 2-6 Between characters',
               'password.required' => 'Password cannot be empty',
               'password.confirm' => 'The two passwords are inconsistent',
               'password_confirmation.required' => 'Confirm password cannot be empty',
               'email.required' => 'email Cannot be empty',
               'email.email' => 'email Incorrect format',
           ]
       );
        if ($validator->fails()) {
            return redirect(route('user.add'))->withErrors($validator);
        }