README

A SilverStripe grouped dropdown field that has its options populated via ajax, based on the value of the dropdown field it depends on.

N.b. This is basically a direct port of Shea Dawson's silverstripe-dependentdropdownfield that applies the ajax to a GroupedDropdownField rather than a DropdownField.

Requirements

SilverStripe 4

Installation

composer require fromholdio/silverstripe-dependentgroupeddropdownfield

What exactly is this?

See user guide for usage screenshots.

Usage example

First, create the DropdownField that your new field's values will be dependent on.

$typeField = DropdownField::create(
    'ProductType',
    'Product Type',
    [
        'animal' => 'Animal',
        'food' => 'Food'
    ]
);

$typeField->setEmptyString('Please select a product type');

Note: it is not necessary for the original dropdown field to have an empty string. If it doesn't, its first value will be used to auto-load the optgroups/options into your dependent field.

Second, create a callable function that returns an array suitable for the $source parameter of GroupedDropdownField. (A two dimensional array; the first level is used for the optgroup, and the second level for the of each group.)

$productFieldSource = function($value) {
    if ($value === 'animal') {
        return [
            'Fun' => [
                'puppy' => 'Puppy',
                'dog' => 'Dog'
            ],
            'Evil' => [
                'cat' => 'Cat'
            ]
        ];
    }
    if ($value === 'food') {
        return [
            'Fruit' => [
                'apple' => 'Apple',
                'orange' => 'Orange'
            ],
            'Vegetables' => [
                'carrot' => 'Carrot',
                'celery' => 'Celery'
            ]
        ];
    }
    return [];
};

Now, create your DependentGroupedDropdownField, setting the source as the callable function created above.

$productField = DependentGroupedDropdownField::create(
    'Product',
    'Product',
    $productFieldSource
);

Ensure that you connect the fields:

$productField->setDepends($typeField);

And now you're ready to go.

$fields->addFieldsToTab(
    'Root.Testing',
    [
        $typeField,
        $productField
    ]
);