silverstripe-framework/forms/DropdownField.php

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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();
* $galleries = DataObject::get('Gallery');
* if ($galleries) {
* $galleries = $galleries->toDropdownMap('ID', 'Title', '(Select one)', true);
* }
* $fields->addFieldToTab('Root.Content', new DropdownField('GalleryID', 'Gallery', $galleries), '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>
*
* Exampe 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 $disabled
*/
protected $disabled;
/**
* @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 $source}-Array
* (can also be boolean, which results in an empty string)
* Argument is deprecated in 2.3, please use {@link setHasEmptyDefault()} and {@link setEmptyString()} instead.
*/
function __construct($name, $title = null, $source = array(), $value = "", $form = null, $emptyString = null) {
$this->source = $source;
if($emptyString) $this->setHasEmptyDefault(true);
if(is_string($emptyString)) $this->setEmptyString($emptyString);
parent::__construct($name, ($title===null) ? $name : $title, $value, $form);
}
/**
* Returns a <select> tag containing all the appropriate <option> tags.
* Makes use of {@link FormField->createTag()} to generate the <select>
* tag and option elements inside is as the content of the <select>.
*
* @return string HTML tag for this dropdown field
*/
function Field() {
$options = '';
$source = $this->getSource();
if($source) {
// For SQLMap sources, the empty string needs to be added specially
if(is_object($source) && $this->emptyString) {
$options .= $this->createTag('option', array('value' => ''), $this->emptyString);
}
foreach($source as $value => $title) {
// Blank value of field and source (e.g. "" => "(Any)")
if($value === '' && ($this->value === '' || $this->value === null)) {
$selected = 'selected';
} else {
// Normal value from the source
if($value) {
$selected = ($value == $this->value) ? 'selected' : null;
} else {
// Do a type check comparison, we might have an array key of 0
$selected = ($value === $this->value) ? 'selected' : null;
}
$this->isSelected = ($selected) ? true : false;
}
$options .= $this->createTag(
'option',
array(
'selected' => $selected,
'value' => $value
),
Convert::raw2xml($title)
);
}
}
$attributes = array(
'class' => ($this->extraClass() ? $this->extraClass() : ''),
'id' => $this->id(),
'name' => $this->name,
'tabindex' => $this->getTabIndex()
);
if($this->disabled) $attributes['disabled'] = 'disabled';
return $this->createTag('select', $attributes, $options);
}
/**
* @return boolean
*/
function isSelected(){
return $this->isSelected;
}
/**
* Gets the source array including any empty default values.
*
* @return array
*/
function getSource() {
if(is_array($this->source) && $this->getHasEmptyDefault()) {
return array(""=>$this->emptyString) + (array)$this->source;
} else {
return $this->source;
}
}
/**
* @param array $source
*/
function setSource($source) {
$this->source = $source;
}
/**
* @param boolean $bool
*/
function setHasEmptyDefault($bool) {
$this->hasEmptyDefault = $bool;
}
/**
* @return boolean
*/
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 $str
*/
function setEmptyString($str) {
$this->setHasEmptyDefault(true);
$this->emptyString = $str;
}
/**
* @return string
*/
function getEmptyString() {
return $this->emptyString;
}
function performReadonlyTransformation() {
$field = new LookupField($this->name, $this->title, $this->source);
$field->setValue($this->value);
$field->setForm($this->form);
$field->setReadonly(true);
return $field;
}
function extraClass(){
$ret = parent::extraClass();
if($this->extraClass) $ret .= " $this->extraClass";
return $ret;
}
/**
* Set form being disabled
*/
function setDisabled($disabled = true) {
$this->disabled = $disabled;
}
}