drupal-form-validation

Name: drupal-form-validation
Author: edutrul

64stars13forks

How to install drupal-form-validation?

edutrul/drupal-ai/drupal-form-validation

$npx -y skills add edutrul/drupal-ai --skill drupal-form-validation

Installs into the current project.

Summary

Drupal form validation — validateForm(), #element_validate, setError(), setErrorByName(), conditional validation (require fields based on other values), and custom validators.

Files · 1

View on GitHub

SKILL.md

1	# Drupal Form Validation
2
3	## validateForm() Method
4
5	```php
6	public function validateForm(array &$form, FormStateInterface $form_state): void {
7	$name = $form_state->getValue('name');
8
9	if (strlen($name) < 3) {
10	$form_state->setErrorByName('name', $this->t('Name must be at least 3 characters.'));
11	}
12
13	if (!preg_match('/^[a-zA-Z\s]+$/', $name)) {
14	$form_state->setErrorByName('name', $this->t('Name may only contain letters and spaces.'));
15	}
16	}
17	```
18
19	## setError vs setErrorByName
20
21	```php
22	// Target a specific form element by name
23	$form_state->setErrorByName('field_date', $this->t('Invalid date.'));
24
25	// Target a nested element
26	$form_state->setErrorByName('field_date][0][value', $this->t('Invalid date.'));
27
28	// Target a specific render element directly
29	$form_state->setError($form['field_date'], $this->t('Invalid date.'));
30	```
31
32	## #element_validate
33
34	Attach a validator directly to an element:
35
36	```php
37	$form['email'] = [
38	'#type' => 'email',
39	'#title' => $this->t('Email'),
40	'#element_validate' => [
41	[static::class, 'validateUniqueEmail'],
42	],
43	];
44
45	public static function validateUniqueEmail(array &$element, FormStateInterface $form_state, array &$form): void {
46	$email = $element['#value'];
47	// Check uniqueness...
48	if ($emailExists) {
49	$form_state->setError($element, t('This email is already registered.'));
50	}
51	}
52	```
53
54	## Conditional Validation
55
56	```php
57	public function validateForm(array &$form, FormStateInterface $form_state): void {
58	$type = $form_state->getValue('type');
59
60	if ($type === 'external') {
61	$url = $form_state->getValue('url');
62	if (empty($url)) {
63	$form_state->setErrorByName('url', $this->t('URL is required for external type.'));
64	}
65	elseif (!UrlHelper::isValid($url, TRUE)) {
66	$form_state->setErrorByName('url', $this->t('Please enter a valid URL.'));
67	}
68	}
69	}
70	```
71
72	## Accessing Values in Validation
73
74	```php
75	// Get a single value
76	$value = $form_state->getValue('my_field');
77
78	// Get nested value
79	$value = $form_state->getValue(['field_date', 0, 'value']);
80
81	// Get all values
82	$values = $form_state->getValues();
83
84	// Check if field has errors
85	if ($form_state->getError($form['my_field'])) { ... }
86	```
87
88	## Adding Validation via hook_form_alter
89
90	```php
91	#[Hook('form_node_article_form_alter')]
92	public function formNodeArticleFormAlter(array &$form, FormStateInterface $form_state): void {
93	// Add before existing validators
94	array_unshift($form['#validate'], [static::class, 'validateArticle']);
95
96	// Add after existing validators
97	$form['#validate'][] = [static::class, 'validateArticle'];
98	}
99
100	public static function validateArticle(array &$form, FormStateInterface $form_state): void {
101	// Validation logic here.
102	}
103	```

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drupal-form-validation

64stars13forks

View on GitHub

How to install drupal-form-validation?

edutrul/drupal-ai/drupal-form-validation

$npx -y skills add edutrul/drupal-ai --skill drupal-form-validation

Installs into the current project.

Summary

Drupal form validation — validateForm(), #element_validate, setError(), setErrorByName(), conditional validation (require fields based on other values), and custom validators.

Files · 1

View on GitHub

SKILL.md

1	# Drupal Form Validation
2
3	## validateForm() Method
4
5	```php
6	public function validateForm(array &$form, FormStateInterface $form_state): void {
7	$name = $form_state->getValue('name');
8
9	if (strlen($name) < 3) {
10	$form_state->setErrorByName('name', $this->t('Name must be at least 3 characters.'));
11	}
12
13	if (!preg_match('/^[a-zA-Z\s]+$/', $name)) {
14	$form_state->setErrorByName('name', $this->t('Name may only contain letters and spaces.'));
15	}
16	}
17	```
18
19	## setError vs setErrorByName
20
21	```php
22	// Target a specific form element by name
23	$form_state->setErrorByName('field_date', $this->t('Invalid date.'));
24
25	// Target a nested element
26	$form_state->setErrorByName('field_date][0][value', $this->t('Invalid date.'));
27
28	// Target a specific render element directly
29	$form_state->setError($form['field_date'], $this->t('Invalid date.'));
30	```
31
32	## #element_validate
33
34	Attach a validator directly to an element:
35
36	```php
37	$form['email'] = [
38	'#type' => 'email',
39	'#title' => $this->t('Email'),
40	'#element_validate' => [
41	[static::class, 'validateUniqueEmail'],
42	],
43	];
44
45	public static function validateUniqueEmail(array &$element, FormStateInterface $form_state, array &$form): void {
46	$email = $element['#value'];
47	// Check uniqueness...
48	if ($emailExists) {
49	$form_state->setError($element, t('This email is already registered.'));
50	}
51	}
52	```
53
54	## Conditional Validation
55
56	```php
57	public function validateForm(array &$form, FormStateInterface $form_state): void {
58	$type = $form_state->getValue('type');
59
60	if ($type === 'external') {
61	$url = $form_state->getValue('url');
62	if (empty($url)) {
63	$form_state->setErrorByName('url', $this->t('URL is required for external type.'));
64	}
65	elseif (!UrlHelper::isValid($url, TRUE)) {
66	$form_state->setErrorByName('url', $this->t('Please enter a valid URL.'));
67	}
68	}
69	}
70	```
71
72	## Accessing Values in Validation
73
74	```php
75	// Get a single value
76	$value = $form_state->getValue('my_field');
77
78	// Get nested value
79	$value = $form_state->getValue(['field_date', 0, 'value']);
80
81	// Get all values
82	$values = $form_state->getValues();
83
84	// Check if field has errors
85	if ($form_state->getError($form['my_field'])) { ... }
86	```
87
88	## Adding Validation via hook_form_alter
89
90	```php
91	#[Hook('form_node_article_form_alter')]
92	public function formNodeArticleFormAlter(array &$form, FormStateInterface $form_state): void {
93	// Add before existing validators
94	array_unshift($form['#validate'], [static::class, 'validateArticle']);
95
96	// Add after existing validators
97	$form['#validate'][] = [static::class, 'validateArticle'];
98	}
99
100	public static function validateArticle(array &$form, FormStateInterface $form_state): void {
101	// Validation logic here.
102	}
103	```

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6 picks

Type