Hi,

I am fairly new silverstripe and I need to validate a form depending on the state of another form.
My first form is a shopping basket with 2 delivery option( 'free' or 'not free').
My second form is a set of delivery address details. Some of the fields are for the 'free' option. The other fields are for the 'not free' option. I can change the visibility of the fields using Jquery. That seems to be working.

My issue comes when validating the form. How can I tell silverstripe which fields are compulsory and which are not?

Currently I have:

            new FieldList(
                $TradeName = new TextField('Name', 'Name'),
                $TradeCompanyName = new TextField('CompanyName', 'Company Name'),
                $TradeEmail = new EmailField('Email', 'Email Address'),
                $TradePhone = new TextField('Phone', 'Telephone Number'),
                $TradeAddress1 = new TextField('Address1', 'Delivery Address Line 1'),
                $TradeAddress2 = new TextField('Address2', 'Delivery Address Line 2'),
                $TradeCity = new TextField('City', 'Delivery Town/City'),
                $TradePostcode = new TextField('Postcode', 'Delivery Postcode'),
                $TradeNotes = new TextareaField('Notes', 'Order Notes'),

		$CustomerName = new TextField('CustomerName', 'Customer Name'),
		$CustomerEmail = new EmailField('CustomerEmail', 'Email Address'),
		$CustomerPhone = new TextField('CustomerPhone', 'Telephone Number'),
                $CustomerAddress1 = new TextField('CustomerAddress1', 'Delivery Address Line 1'),
                $CustomerAddress2 = new TextField('CustomerAddress2', 'Delivery Address Line 2'),
                $CustomerCity = new TextField('CustomerCity', 'Delivery City'),
                $CustomerPostcode = new TextField('CustomerPostcode', 'Delivery Postcode'),
                $CustomerNotes = new TextField('CustomerNotes', 'Order Notes'),


            new FormValidator(array(
                'Name' => array('required'), 
                'Email' => array('required'),
                'Phone' => array('required'),
                'Address1' => array('required'),
                'City' => array('required'),
                'Postcode' => array('required'),
                 'CustomerName' => array('required'), 
                'CustomerEmail' => array('required'),
                'CustomerPhone' => array('required'),
                'CustomerAddress1' => array('required'),
                'CustomerCity' => array('required'),
                'CustomerPostcode' => array('required')
            ))

but I must have to add something as this depends on the delivery option. just don't know what it is...

As an laternative to Silverstripe validation, I am thinking of using jquery validation [url= https://jqueryvalidation.org/] [url]https://jqueryvalidation.org/ . Would that be better?

Hi,

Take a look a the Zen Validator module. https://github.com/sheadawson/silverstripe-zenvalidator. In my opinion this is the best validator module for SilverStripe.

In particular the "Validation Logic - Conditional Constraints" near the end of the readme which mentions using "Display Logic" like conditions. You could use this to only require certain fields, such as when the delivery option is free or not free.

In your function which creates the form fields...

$TradeAddress1->validateIf('DeliveryOption')->isEqualTo('free');
$TradeAddress2->validateIf('DeliveryOption')->isEqualTo('free');

$CustomerAddress1->validateIf('DeliveryOption')->isEqualTo('not-free');
$CustomerAddress2->validateIf('DeliveryOption')->isEqualTo('not-free');

Then create this function below the one which creates the form fields...

public function getCMSValidator()
{
    $validator = ZenValidator::create();
    
    $validator->addRequiredFields(
        array(
            'TradeAddress1',
            'TradeAddress2',
            'CustomerAddress1',
            'CustomerAddress2',
        )
    );

    return $validator;
}