Elefant makes it easy to add dynamic data to your custom fields by defining a class with a callback method that supplies the dynamic data to a field.
A conf/fields.php file in your app tells Elefant that your app defines new field
types that should be available in the Custom Fields forms.
Here is what a custom field type looks like in PHP:
<?php // apps/myapp/lib/Category.php
namespace myapp;
class Category {
public static function fetch_list ($class, $id = null) {
// replace with a dynamic database call
return array (
'general' => 'General',
'health' => 'Health'
);
}
}
?>
This example just returns a hard-coded array, but you can replace that with a database
call or another external data source. You can also use the $class and $id values
to filter the data. Note that the $id will be null when a form is adding content
instead of editing existing content.
To link this to the Custom Fields forms, enter the following in your conf/fields.php:
; <?php /*
[myapp_categories]
name = "MyAPP: Categories"
type = select
callback = "myapp\Category::fetch_list"
; */ ?>
When you visit one of the Custom Fields forms in the Elefant admin, you should see your new field type in the type list.
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