silverstripe-framework/src/Forms/SelectionGroup.php

<?php

namespace SilverStripe\Forms;

use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\FieldType\DBField;
use SilverStripe\View\Requirements;

/**
 * Represents a number of fields which are selectable by a radio
 * button that appears at the beginning of each item.  Using CSS, you can
 * configure the field to only display its contents if the corresponding radio
 * button is selected. Each item is defined through {@link SelectionGroup_Item}.
 *
 * @example <code>
 * $items = array(
 * 	new SelectionGroup_Item(
 * 		'one',
 * 		new LiteralField('one', 'one view'),
 * 		'one title'
 * 	),
 * 	new SelectionGroup_Item(
 * 		'two',
 * 		new LiteralField('two', 'two view'),
 * 		'two title'
 * 	),
 * );
 * $field = new SelectionGroup('MyGroup', $items);
 * </code>
 *
 * Caution: The form field does not include any JavaScript or CSS when used outside of the CMS context,
 * since the required frontend dependencies are included through CMS bundling.
 */
class SelectionGroup extends CompositeField {

	/**
	 * Create a new selection group.
	 *
	 * @param string $name The field name of the selection group.
	 * @param array $items The list of {@link SelectionGroup_Item}
	 * @param mixed $value
	 */
	public function __construct($name, $items, $value = null) {
		if($value !== null) {
			$this->setValue($value);
		}

		$selectionItems = array();

		foreach($items as $key => $item) {
			if($item instanceof SelectionGroup_Item) {
				$selectionItems[] = $item;
			} else {
				// Convert legacy format
				if(strpos($key,'//') !== false) {
					list($key,$title) = explode('//', $key,2);
				} else {
					$title = null;
				}
				$selectionItems[] = new SelectionGroup_Item($key, $item, $title);
			}
		}

		parent::__construct($selectionItems);

		$this->setName($name);
	}

	public function FieldSet() {
		return $this->FieldList();
	}

	public function FieldList() {
		$items = parent::FieldList()->toArray();
		$count = 0;
		$newItems = array();

		/** @var SelectionGroup_Item $item */
		foreach($items as $item) {
			if($this->value == $item->getValue()) {
				$firstSelected = true;
				$checked = true;
			} else {
				$firstSelected = false;
				$checked = false;
			}

			$itemID = $this->ID() . '_' . (++$count);
			// @todo Move into SelectionGroup_Item.ss template at some point.
			$extra = array(
				"RadioButton" => DBField::create_field('HTMLFragment', FormField::create_tag(
					'input',
					array(
						'class' => 'selector',
						'type' => 'radio',
						'id' => $itemID,
						'name' => $this->name,
						'value' => $item->getValue(),
						'checked' => $checked,
						'aria-labelledby' => "title-{$itemID}",
					)
				)),
				"RadioLabel" => DBField::create_field('HTMLFragment', FormField::create_tag(
					'label',
					array(
						'id' => "title-{$itemID}",
						'for' => $itemID
					),
					$item->getTitle()
				)),
				"Selected" => $firstSelected,
			);
			$newItems[] = $item->customise($extra);
		}

		return new ArrayList($newItems);
	}

	public function hasData() {
		return true;
	}

	public function FieldHolder($properties = array()) {
		return parent::FieldHolder($properties);
	}
}