README

Convert Symfony constraints into data-attributes for client-side validation with Parsley.

Installation

Install the bundle with composer:

composer require j-ben87/parsley-bundle

Install Parsley library: http://parsleyjs.org/doc/index.html#installation

Configuration

The bundle exposes a basic configuration:

jben87_parsley:
    enabled: true           # enable/disable Parsley validation globally (can be enabled on FormType or Constraint level)
    trigger_event: 'blur'   # the JavaScript event for which the validation is to be triggered (relative to the selected input)

Usage

Form constraints

Create a FormType.

Any supported constraints you have defined on your form will automatically be turned into Parsley data-attributes.

Yes, it's that simple!

<?php

declare(strict_types=1);

namespace App\Form\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\TextareaType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\Validator\Constraints as Assert;

final class CustomType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('title', TextType::class, [
                'constraints' => [
                    new Assert\NotBlank(),
                    new Assert\Length(30),
                ],
            ])
            ->add('content', TextareaType::class, [
                'constraints' => [
                    new Assert\NotBlank(),
                ],
            ])
        ;
    }
}

Results in:

<!-- {{ form_widget(form.title) }} -->
<input type="text" id="title" name="title" required="required" data-parsley-trigger="blur" data-parsley-required="true" data-parsley-required-message="This value should not be blank." data-parsley-length="[30, 30]" data-parsley-length-message="This value should have exactly 30 characters.">

<!-- {{ form_widget(form.content }} -->
<textarea id="content" name="content" required="required" data-parsley-trigger="blur" data-parsley-required="true" data-parsley-required-message="This value should not be blank."></textarea>

data-class constraints

Create a FormType and configure its data-class option.

Any supported constraint you have defined on your class will automatically be turned into Parsley data-attributes.

Here again, it's incredibly simple!

<?php

declare(strict_types=1);

namespace App\Model;

use Symfony\Component\Validator\Constraints as Assert;

final class User
{
    /**
     * @Assert\NotBlank()
     * @Assert\Length(max=255)
     */
    private ?string $username = null;

    /**
     * @Assert\NotBlank()
     * @Assert\Length(max=255)
     * @Assert\Email()
     */
    private ?string $email = null;
}

And

<?php

declare(strict_types=1);

namespace App\Form\Type;

use App\Model\User;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

final class UserType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('username')
            ->add('email')
        ;
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefault('data_class', User::class);
    }
}

Results in:

{% {{ form_widget(form.username) }} %}
<input type="text" id="username" name="username" required="required" maxlength="255" data-parsley-trigger="blur" data-parsley-required="true" data-parsley-required-message="This value should not be blank." data-parsley-maxlength="255" data-parsley-maxlength-message="This value is too long. It should have 255 characters or less.">

{% {{ form_widget(form.email }} %}
<input type="email" id="email" name="email" required="required" maxlength="255" data-parsley-trigger="blur" data-parsley-required="true" data-parsley-required-message="This value should not be blank." data-parsley-maxlength="255" data-parsley-maxlength-message="This value is too long. It should have 255 characters or less." data-parsley-type="email" data-parsley-type-message="This value is not a valid email address.">

Notice: if you define the same constraint on both the FormType and the configured data-class, the FormType constraint will override the one configured on the data-class.

Internals

The ParsleyTypeExtension is where all the magic happens.

It gathers all Symfony constraints thanks to registered readers and turn them into Parsley constraints through factories.

It uses the special ChainFactory to automatically find the first factory that supports the given Symfony constraint.

Finally it normalizes the Parsley constraint into data-attributes and merge them with the FormView attributes.

Extending the bundle

You can easily add more constraints by:

• creating a constraint that extends the abstract class JBen87\ParsleyBundle\Constraint\Constraint
• creating a factory that implements the interface JBen87\ParsleyBundle\Constraint\Factory\FactoryInterface

Your factory will be automatically registered to be used by the ChainFactory service.

<?php

declare(strict_types=1);

namespace App\Constraint\Constraints;

use JBen87\ParsleyBundle\Constraint\Constraint;

final class Valid extends Constraint
{
    protected function getAttribute(): string
    {
        return 'data-parsley-valid';
    }

    protected function getValue(): string
    {
        return 'true';
    }
}

<?php

declare(strict_types=1);

namespace App\Constraint\Factory;

use App\Constraint\Constraints as ParsleyAssert;
use JBen87\ParsleyBundle\Constraint\Constraint;
use JBen87\ParsleyBundle\Constraint\Factory\FactoryTrait;
use JBen87\ParsleyBundle\Constraint\Factory\TranslatableFactoryInterface;
use Symfony\Component\Validator\Constraint as SymfonyConstraint;
use Symfony\Component\Validator\Constraints as Assert;

final class ValidFactory implements TranslatableFactoryInterface
{
    use FactoryTrait;

    public function create(SymfonyConstraint $constraint): Constraint
    {
        /** @var Assert\Valid $constraint */

        return new ParsleyAssert\Valid([
            'message' => $this->trans($constraint->message),
        ]);
    }

    public function supports(SymfonyConstraint $constraint): bool
    {
        return $constraint instanceof Assert\Valid;
    }
}

Supported constraints

The following Symfony constraints are currently supported:

• Symfony\Component\Validator\Constraints\Date
• Symfony\Component\Validator\Constraints\DateTime
• Symfony\Component\Validator\Constraints\Email
• Symfony\Component\Validator\Constraints\GreaterThan
• Symfony\Component\Validator\Constraints\GreaterThanOrEqual
• Symfony\Component\Validator\Constraints\Length
• Symfony\Component\Validator\Constraints\LessThan
• Symfony\Component\Validator\Constraints\LessThanOrEqual
• Symfony\Component\Validator\Constraints\NotBlank
• Symfony\Component\Validator\Constraints\Range
• Symfony\Component\Validator\Constraints\Time
• Symfony\Component\Validator\Constraints\Type
• Symfony\Component\Validator\Constraints\Url

What's next

• Support more constraints
• Support group validation