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<?php
/**
* Dropdown field, created from a <select> tag.
*
* <b>Setting a $has_one relation</b>
*
* Using here an example of an art gallery, with Exhibition pages,
* each of which has a Gallery they belong to. The Gallery class is also user-defined.
* <code>
* static $has_one = array(
* 'Gallery' => 'Gallery',
* );
*
* public function getCMSFields() {
* $fields = parent::getCMSFields();
* $field = new DropdownField('GalleryID', 'Gallery', Gallery::get()->map('ID', 'Title'));
* $field->setEmptyString('(Select one)');
* $fields->addFieldToTab('Root.Content', $field, 'Content');
* </code>
*
* As you see, you need to put "GalleryID", rather than "Gallery" here.
*
* <b>Populate with Array</b>
*
* Example model defintion:
* <code>
* class MyObject extends DataObject {
* static $db = array(
* 'Country' => "Varchar(100)"
* );
* }
* </code>
*
* Example instantiation:
* <code>
* new DropdownField(
* 'Country',
* 'Country',
* array(
* 'NZ' => 'New Zealand',
* 'US' => 'United States'
* 'GEM'=> 'Germany'
* )
* );
* </code>
*
* <b>Populate with Enum-Values</b>
*
* You can automatically create a map of possible values from an {@link Enum} database column.
*
* Example model definition:
* <code>
* class MyObject extends DataObject {
* static $db = array(
* 'Country' => "Enum('New Zealand,United States,Germany','New Zealand')"
* );
* }
* </code>
*
* Field construction:
* <code>
* new DropdownField(
* 'Country',
* 'Country',
* singleton('MyObject')->dbObject('Country')->enumValues()
* );
* </code>
*
* @see CheckboxSetField for multiple selections through checkboxes instead.
* @see ListboxField for a single <select> box (with single or multiple selections).
* @see TreeDropdownField for a rich and customizeable UI that can visualize a tree of selectable elements
*
* @package forms
* @subpackage fields-basic
*/
class DropdownField extends FormField {
/**
* @var boolean $source Associative or numeric array of all dropdown items,
* with array key as the submitted field value, and the array value as a
* natural language description shown in the interface element.
*/
protected $source;
/**
* @var boolean $isSelected Determines if the field was selected
* at the time it was rendered, so if {@link $value} matches on of the array
* values specified in {@link $source}
*/
protected $isSelected;
/**
* @var boolean $hasEmptyDefault Show the first <option> element as
* empty (not having a value), with an optional label defined through
* {@link $emptyString}. By default, the <select> element will be
* rendered with the first option from {@link $source} selected.
*/
protected $hasEmptyDefault = false;
/**
* @var string $emptyString The title shown for an empty default selection,
* e.g. "Select...".
*/
protected $emptyString = '';
/**
* Creates a new dropdown field.
* @param $name The field name
* @param $title The field title
* @param $source An map of the dropdown items
* @param $value The current value
* @param $form The parent form
* @param $emptyString mixed Add an empty selection on to of the {@link $source}-Array (can also be boolean, which
* results in an empty string). Argument is deprecated in 3.1, please use
* {@link setEmptyString()} and/or {@link setHasEmptyDefault(true)} instead.
*/
public function __construct($name, $title=null, $source=array(), $value='', $form=null, $emptyString=null) {
$this->setSource($source);
if($emptyString === true) {
Deprecation::notice('3.1',
'Please use setHasEmptyDefault(true) instead of passing a boolean true $emptyString argument',
Deprecation::SCOPE_GLOBAL);
}
if(is_string($emptyString)) {
Deprecation::notice('3.1', 'Please use setEmptyString() instead of passing a string emptyString argument.',
Deprecation::SCOPE_GLOBAL);
}
if($emptyString) $this->setHasEmptyDefault(true);
if(is_string($emptyString)) $this->setEmptyString($emptyString);
parent::__construct($name, ($title===null) ? $name : $title, $value, $form);
}
public function Field($properties = array()) {
$source = $this->getSource();
$options = array();
if($source) {
// SQLMap needs this to add an empty value to the options
if(is_object($source) && $this->emptyString) {
$options[] = new ArrayData(array(
'Value' => '',
'Title' => $this->emptyString,
));
}
foreach($source as $value => $title) {
$selected = false;
if($value === '' && ($this->value === '' || $this->value === null)) {
$selected = true;
} else {
// check against value, fallback to a type check comparison when !value
$selected = ($value) ? $value == $this->value : $value === $this->value;
$this->isSelected = $selected;
}
$options[] = new ArrayData(array(
'Title' => $title,
'Value' => $value,
'Selected' => $selected,
));
}
}
$properties = array_merge($properties, array('Options' => new ArrayList($options)));
return parent::Field($properties);
}
public function getAttributes() {
return array_merge(
parent::getAttributes(),
array('type' => null, 'value' => null)
);
}
/**
* @return boolean
*/
public function isSelected() {
return $this->isSelected;
}
/**
* Gets the source array including any empty default values.
*
* @return array
*/
public function getSource() {
if(is_array($this->source) && $this->getHasEmptyDefault()) {
return array('' => $this->emptyString) + (array) $this->source;
} else {
return $this->source;
}
}
/**
* @param array $source
*/
public function setSource($source) {
$this->source = $source;
return $this;
}
/**
* @param boolean $bool
*/
public function setHasEmptyDefault($bool) {
$this->hasEmptyDefault = $bool;
return $this;
}
/**
* @return boolean
*/
public function getHasEmptyDefault() {
return $this->hasEmptyDefault;
}
/**
* Set the default selection label, e.g. "select...".
* Defaults to an empty string. Automatically sets
* {@link $hasEmptyDefault} to true.
*
* @param string $str
*/
public function setEmptyString($str) {
$this->setHasEmptyDefault(true);
$this->emptyString = $str;
return $this;
}
/**
* @return string
*/
public function getEmptyString() {
return $this->emptyString;
}
public function performReadonlyTransformation() {
$field = new LookupField($this->name, $this->title, $this->getSource());
$field->setValue($this->value);
$field->setForm($this->form);
$field->setReadonly(true);
return $field;
}
}
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