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Continuing from the Repeaters thread about the field-template context… This video demonstrates how you can adjust the admin context of individual fields according to the template they are placed in. When you adjust the context in this manner, it only changes the settings for when a field appears in that template. This expands the reusability potential of fields across different templates, hopefully preventing the need to create another field if all you really needed was a different title, description or width. You can do this same type of configuration when editing a field in a repeater too. View this full screen which should put YouTube into HD mode, where it's much easier to see.

Here are the fields you can set with a Page field: <?php $f = $fields->get("some_page_field"); // InputfieldPage settings $f->parent_id = 123; // ID of allowed parent page $f->template_id = 4; // ID of allowed template $f->findPagesCode = 'return $page->parent->children();'; // alternate code to use for included pages $f->labelFieldName = 'title'; // name of field to use as label (default is title) $f->inputfield = 'InputfieldSelect'; // class name of inputfield you want to delegate selection to // FieldtypePage settings $f->derefAsPage = FieldtypePage::derefAsPageArray; // Multiple pages (PageArray) $f->derefAsPage = FieldtypePage::derefAsPageOrFalse; // Single page (Page) or boolean false when none selected $f->derefAsPage = FieldtypePage::derefAsPageOrNullPage; // Single page (Page) or empty page (NullPage) when non selected The Inputfield settings only affect what is displayed in the admin (i.e. for locating what pages it should display as selectable).