silverstripe-framework/forms/GroupedDropdownField.php

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<?php
use SilverStripe\ORM\ArrayList;
/**
* Grouped dropdown, using <optgroup> tags.
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*
* $source parameter (from DropdownField) must be a two dimensional array.
* The first level of the array is used for the <optgroup>, and the second
* level are the <options> for each group.
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*
* Returns a <select> tag containing all the appropriate <option> tags, with
* <optgroup> tags around the <option> tags as required.
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*
* <b>Usage</b>
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*
* <code>
* new GroupedDropdownField(
* $name = "dropdown",
* $title = "Simple Grouped Dropdown",
* $source = array(
* "numbers" => array(
* "1" => "1",
* "2" => "2",
* "3" => "3",
* "4" => "4"
* ),
* "letters" => array(
* "1" => "A",
* "2" => "B",
* "3" => "C",
* "4" => "D",
* "5" => "E",
* "6" => "F"
* )
* )
* )
* </code>
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*
* <b>Disabling individual items</b>
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*
* Unlike the source, disabled items are specified in the same way as
* normal DropdownFields, using a single value list. Don't pass in grouped
* values here.
*
* <code>
* // Disables first and third option in each group
* $groupedDrDownField->setDisabledItems(array("1", "3"))
* </code>
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*
* @package forms
* @subpackage fields-basic
*/
class GroupedDropdownField extends DropdownField {
/**
* Build a potentially nested fieldgroup
*
* @param mixed $valueOrGroup Value of item, or title of group
* @param string|array $titleOrOptions Title of item, or options in grouip
* @return ArrayData Data for this item
*/
protected function getFieldOption($valueOrGroup, $titleOrOptions) {
// Return flat option
if(!is_array($titleOrOptions)) {
return parent::getFieldOption($valueOrGroup, $titleOrOptions);
}
// Build children from options list
$options = new ArrayList();
foreach($titleOrOptions as $childValue => $childTitle) {
$options->push($this->getFieldOption($childValue, $childTitle));
}
return new ArrayData(array(
'Title' => $valueOrGroup,
'Options' => $options
));
}
public function Type() {
return 'groupeddropdown dropdown';
}
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public function getSourceValues() {
// Flatten values
$values = array();
$source = $this->getSource();
array_walk_recursive(
$source,
// Function to extract value from array key
function($title, $value) use (&$values) {
$values[] = $value;
}
);
return $values;
}
}