Agent skill

nette-forms

Provides Nette Forms conventions and patterns. Use when creating forms, form validation, form controls, rendering forms, or handling form submissions in presenters.

View SKILL.md on GitHub Repository
Stars 163
Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/development/nette-forms-nette-claude-code

SKILL.md

Nette Forms

Nette Forms provides secure, reusable forms with automatic validation on both client and server side.

shell
composer require nette/forms

Forms in Presenters

Forms are created in factory methods named createComponent<Name>:

php
protected function createComponentRegistrationForm(): Form
{
	$form = new Form;
	$form->addText('name', 'Name:')
		->setRequired('Please enter your name.');

	$form->addEmail('email', 'Email:')
		->setRequired('Please enter your email.');

	$form->addPassword('password', 'Password:')
		->setRequired('Please enter password.')
		->addRule($form::MinLength, 'Password must be at least %d characters', 8);

	$form->addSubmit('send', 'Register');

	$form->onSuccess[] = $this->registrationFormSucceeded(...);
	return $form;
}

private function registrationFormSucceeded(Form $form, \stdClass $data): void
{
	// $data->name, $data->email, $data->password
	$this->flashMessage('Registration successful.');
	$this->redirect('Home:');
}

Render in template:

latte
{control registrationForm}

Create and Edit Pattern

Unified form for both creating and editing records:

php
class ProductPresenter extends BasePresenter
{
	public function __construct(
		private ProductFacade $facade,
	) {}

	public function renderEdit(int $id = null): void
	{
		$this->template->product = $id
			? $this->facade->getProduct($id)
			: null;
	}

	protected function createComponentProductForm(): Form
	{
		$form = new Form;
		$form->addText('name', 'Name:')
			->setRequired();
		$form->addTextArea('description', 'Description:');
		$form->addInteger('price', 'Price:')
			->setRequired()
			->addRule($form::Min, 'Price must be positive', 1);
		$form->addSubmit('send', 'Save');
		$form->onSuccess[] = $this->productFormSucceeded(...);
		return $form;
	}

	private function productFormSucceeded(Form $form, \stdClass $data): void
	{
		$id = $this->getParameter('id');
		if ($id) {
			$this->facade->update($id, (array) $data);
			$this->flashMessage('Product updated.');
		} else {
			$this->facade->create((array) $data);
			$this->flashMessage('Product created.');
		}
		$this->redirect('default');
	}
}

Template with edit check:

latte
{block content}
<h1>{if $product}Edit: {$product->name}{else}New Product{/if}</h1>

{form productForm}
	{if $product}
		{$form['name']->setDefaultValue($product->name)}
		{$form['description']->setDefaultValue($product->description)}
		{$form['price']->setDefaultValue($product->price)}
	{/if}
	<table>
		<tr>
			<td>{label name}{input name}</td>
		</tr>
		<tr>
			<td>{label description}{input description}</td>
		</tr>
		<tr>
			<td>{label price}{input price}</td>
		</tr>
	</table>
	{input send}
{/form}
{/block}

Form Reuse with Factory

For forms used in multiple places, create a factory:

php
final class ProductFormFactory
{
	public function __construct(
		private FormFactory $formFactory,
	) {}

	public function create(callable $onSuccess): Form
	{
		$form = $this->formFactory->create();
		$form->addText('name', 'Name:')
			->setRequired();
		$form->addTextArea('description', 'Description:');
		$form->addInteger('price', 'Price:')
			->setRequired();
		$form->addSubmit('send');
		$form->onSuccess[] = function (Form $form, \stdClass $data) use ($onSuccess) {
			$onSuccess($data);
		};
		return $form;
	}
}

Use in presenter:

php
public function __construct(
	private ProductFormFactory $productFormFactory,
) {}

protected function createComponentProductForm(): Form
{
	return $this->productFormFactory->create(
		function (\stdClass $data): void {
			$this->facade->save($data);
			$this->redirect('default');
		},
	);
}

Common Form Controls

Method Creates
addText($name, $label) Text input
addPassword($name, $label) Password input
addTextArea($name, $label) Multi-line text
addEmail($name, $label) Email with validation
addInteger($name, $label) Integer input
addFloat($name, $label) Decimal input
addCheckbox($name, $caption) Checkbox
addCheckboxList($name, $label, $items) Multiple checkboxes
addRadioList($name, $label, $items) Radio buttons
addSelect($name, $label, $items) Dropdown
addMultiSelect($name, $label, $items) Multi-select
addUpload($name, $label) File upload
addMultiUpload($name, $label) Multiple files
addDate($name, $label) Date picker
addHidden($name) Hidden field
addSubmit($name, $caption) Submit button
addButton($name, $caption) Button

For complete control reference, see controls.md.

Basic Validation

php
$form->addText('name')
	->setRequired('Name is required.')
	->addRule($form::MinLength, 'At least %d characters', 3)
	->addRule($form::MaxLength, 'Maximum %d characters', 100);

$form->addEmail('email')
	->setRequired()
	->addRule($form::Email, 'Invalid email format.');

$form->addInteger('age')
	->addRule($form::Range, 'Age must be between %d and %d', [18, 120]);

$form->addPassword('password')
	->setRequired()
	->addRule($form::MinLength, 'At least %d characters', 8);

$form->addPassword('password2')
	->setRequired()
	->addRule($form::Equal, 'Passwords must match', $form['password']);

For complete validation reference, see validation.md.

Conditional Validation

php
$form->addCheckbox('newsletter', 'Subscribe to newsletter');

$form->addEmail('email')
	->addConditionOn($form['newsletter'], $form::Equal, true)
		->setRequired('Email required for newsletter.');

Form Rendering

Default rendering:

latte
{control productForm}

Manual rendering:

latte
{form productForm}
<table>
	<tr>
		<th>{label name /}</th>
		<td>{input name} {inputError name}</td>
	</tr>
	<tr>
		<th>{label email /}</th>
		<td>{input email} {inputError email}</td>
	</tr>
</table>
{input send}
{/form}

With Bootstrap:

latte
{form productForm class => 'form-horizontal'}
<div class="mb-3">
	{label name class => 'form-label' /}
	{input name class => 'form-control'}
	{inputError name class => 'invalid-feedback'}
</div>
{/form}

For complete rendering reference, see rendering.md.

Form Events

php
// Before rendering (modify form)
$form->onRender[] = function (Form $form): void {
	// Add CSS classes, modify controls
};

// After successful validation
$form->onSuccess[] = function (Form $form, \stdClass $data): void {
	// Process valid data
};

// After any submission (valid or invalid)
$form->onSubmit[] = function (Form $form): void {
	// Logging, analytics
};

// Custom validation after rules pass
$form->onValidate[] = function (Form $form): void {
	if ($this->isBlocked($form->getValues()->email)) {
		$form->addError('This email is blocked.');
	}
};

Error Handling

php
private function productFormSucceeded(Form $form, \stdClass $data): void
{
	try {
		$this->facade->save($data);
		$this->redirect('default');
	} catch (DuplicateEntryException) {
		$form['email']->addError('Email already exists.');
	} catch (\Exception $e) {
		$form->addError('An error occurred.');
	}
}

Anti-Patterns to Avoid

  • Don't put business logic in form handlers - use services/facades
  • Don't create forms in action methods - use createComponent* factory
  • Don't validate twice - use form validation, not manual checking
  • Don't skip setRequired() - always validate required fields

Online Documentation

For detailed information, fetch from doc.nette.org:

Didn't find tool you were looking for?

Be as detailed as possible for better results