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How do you handle custom form validation messages in SilverStripe?

How do you handle custom form validation messages in SilverStripe?

To handle custom form validation messages in SilverStripe, you can follow these minimal steps:

Step 1: Create a Custom Form

First, create your custom form class or extend an existing one.

Example

<?php
use SilverStripe\Forms\Form;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\TextField;
use SilverStripe\Forms\RequiredFields;

class MyCustomForm extends Form
{
    public function __construct($controller, $name)
    {
        $fields = FieldList::create(
            TextField::create('MyField', 'Enter a value')
        );

        $validator = RequiredFields::create('MyField'); // Validate that MyField is required

        parent::__construct($controller, $name, $fields, $validator);
    }
}
?>

Step 2: Define Custom Validation Messages

To define custom validation messages, you can use the setMessage method on the validator.

Example

<?php
$validator = RequiredFields::create('MyField');
$validator->setMessage('MyField is required. Please fill it out.', 'required');
?>

Step 3: Implement the Form in Your Controller

In your controller, instantiate the form and pass it to your template.

Example

<?php
use SilverStripe\Control\Controller;
use SilverStripe\Forms\Form;

class MyPageController extends Controller
{
    private static $allowed_actions = ['MyForm'];

    public function MyForm()
    {
        return MyCustomForm::create($this, 'MyForm');
    }
}
?>

Step 4: Render the Form in Your Template

In your template, render the form and display validation messages.

Example

<% if $MyForm.hasErrors %>
    <div class="error">
        <% loop $MyForm.Errors %>
            <p>$Message</p>
        <% end_loop %>
    </div>
<% end_if %>
$MyForm

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