You can validate fields in UI components using validation rules defined in XML. UI components provide a structured way to define the layout and behavior of various admin forms, grids, and other user interfaces. Here's how you can validate a field in a UI component:
1. Define Validation Rules in XML:
In your UI component XML file (e.g., Vendor/Module/view/adminhtml/ui_component/{your_form}.xml), you can specify validation rules for a field using the <validation> node. Here's an example of how to define a required validation rule:
<field name="your_field">
<argument name="data" xsi:type="array">
<item name="config" xsi:type="array">
<!-- Other field configuration options -->
<item name="validation" xsi:type="array">
<item name="required-entry" xsi:type="boolean">true</item>
</item>
</item>
</argument>
</field>
You can add additional validation rules by adding more items to the <validation> array.
2. Validate the Form Data:
When you save or submit the form, Magento automatically validates the form data based on the validation rules defined in the UI component XML. If any validation rule fails, Magento will display error messages to the user.
If you want to perform additional validation or validation on custom scenarios, you can do so in the appropriate controller, service, or model where you handle the form submission. You can use \Magento\Framework\Validator\ValidatorInterface for this purpose.
For example:
use Magento\Framework\Validator\ValidatorInterface;
class YourController
{
private $validator;
public function __construct(ValidatorInterface $validator)
{
$this->validator = $validator;
}
public function execute()
{
$formData = $this->getRequest()->getPostValue();
$validationResult = $this->validator->validate($formData);
if ($validationResult !== true) {
foreach ($validationResult as $error) {
// Handle validation errors
}
}
// Other logic to handle form submission
}
}
