SIlverStripe PHP - “添加新内容”或选择下拉列表中的现有内容

Question

This should be relatively simple. I know how to create a form and hide it and show it if a specific option is selected

I want to have a Dropdown populated with a specific DataObject. That much is simple. But I need to add an option that says 'Add new' to this Dropdown, which is in a form

I can handle the submission (like if the value is something like 'new' instead of an ID), but I do not know how to add this option into the select with Silverstripe, or if it is even possible. Any help is appreciated!

Answer 1

You can use a DropdownField and populate it with whatever key value pairs you want. For example:

$itemsField = DropdownField::create(
    'Items',
    'Items',
    ['add-new' => 'Add new'] + $this->Items()->map()->toArray()
);

The third argument is an array that gets turned into the option html elements for the drop down.

Then you can add it to your form's FieldList:

$form = Form::create(
    $this, 
    'MyForm', 
    FieldList::create(
        [
            $someField,
            $someOtherField,
            $itemsField
        ]
    ), 
    $actions, 
    $requiredFields
);

http://api.silverstripe.org/3.1/class-DropdownField.html