silverstripe-tagfield/src/TagField.php

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<?php
namespace SilverStripe\TagField;
use SilverStripe\Control\Controller;
use SilverStripe\Control\HTTPRequest;
use SilverStripe\Control\HTTPResponse;
use SilverStripe\Core\Injector\Injector;
use SilverStripe\Forms\DropdownField;
use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\DataList;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\DataObjectInterface;
use SilverStripe\ORM\SS_List;
use SilverStripe\View\ArrayData;
use SilverStripe\View\Requirements;
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/**
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* Provides a tagging interface, storing links between tag DataObjects and a parent DataObject.
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*
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* @package forms
* @subpackage fields
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*/
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class TagField extends DropdownField
{
/**
* @var array
*/
private static $allowed_actions = array(
'suggest'
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);
/**
* @var bool
*/
protected $shouldLazyLoad = false;
/**
* @var int
*/
protected $lazyLoadItemLimit = 10;
/**
* @var bool
*/
protected $canCreate = true;
/**
* @var string
*/
protected $titleField = 'Title';
/**
* @var DataList
*/
protected $sourceList;
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/**
* @var bool
*/
protected $isMultiple = true;
/**
* @param string $name
* @param string $title
* @param null|DataList $source
* @param null|DataList $value
*/
public function __construct($name, $title = '', $source = [], $value = null)
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{
$this->setSourceList($source);
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parent::__construct($name, $title, $source, $value);
}
/**
* @return bool
*/
public function getShouldLazyLoad()
{
return $this->shouldLazyLoad;
}
/**
* @param bool $shouldLazyLoad
*
* @return static
*/
public function setShouldLazyLoad($shouldLazyLoad)
{
$this->shouldLazyLoad = $shouldLazyLoad;
return $this;
}
/**
* @return int
*/
public function getLazyLoadItemLimit()
{
return $this->lazyLoadItemLimit;
}
/**
* @param int $lazyLoadItemLimit
*
* @return static
*/
public function setLazyLoadItemLimit($lazyLoadItemLimit)
{
$this->lazyLoadItemLimit = $lazyLoadItemLimit;
return $this;
}
/**
* @return bool
*/
public function getIsMultiple()
{
return $this->isMultiple;
}
/**
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* @param bool $isMultiple
*
* @return static
*/
public function setIsMultiple($isMultiple)
{
$this->isMultiple = $isMultiple;
return $this;
}
/**
* @return bool
*/
public function getCanCreate()
{
return $this->canCreate;
}
/**
* @param bool $canCreate
*
* @return static
*/
public function setCanCreate($canCreate)
{
$this->canCreate = $canCreate;
return $this;
}
/**
* @return string
*/
public function getTitleField()
{
return $this->titleField;
}
/**
* @param string $titleField
*
* @return $this
*/
public function setTitleField($titleField)
{
$this->titleField = $titleField;
return $this;
}
/**
* Get the DataList source. The 4.x upgrade for SelectField::setSource starts to convert this to an array
* @return DataList
*/
public function getSourceList()
{
return $this->sourceList;
}
/**
* Set the model class name for tags
* @param DataList $className
* @return self
*/
public function setSourceList($sourceList)
{
$this->sourceList = $sourceList;
return $this;
}
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/**
* {@inheritdoc}
*/
public function Field($properties = array())
{
Requirements::css('silverstripe/tagfield:css/select2.min.css');
Requirements::css('silverstripe/tagfield:css/TagField.css');
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Requirements::javascript('silverstripe/tagfield:js/select2.js');
Requirements::javascript('silverstripe/tagfield:js/TagField.js');
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$this->addExtraClass('ss-tag-field');
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if ($this->getIsMultiple()) {
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$this->setAttribute('multiple', 'multiple');
}
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if ($this->shouldLazyLoad) {
$this->setAttribute('data-ss-tag-field-suggest-url', $this->getSuggestURL());
} else {
$properties = array_merge($properties, array(
'Options' => $this->getOptions()
));
}
$this->setAttribute('data-can-create', (int) $this->getCanCreate());
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return $this
->customise($properties)
->renderWith(self::class);
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}
/**
* @return string
*/
protected function getSuggestURL()
{
return Controller::join_links($this->Link(), 'suggest');
}
/**
* @return ArrayList
*/
protected function getOptions()
{
$options = ArrayList::create();
$source = $this->getSourceList();
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if (!$source) {
$source = ArrayList::create();
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}
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$dataClass = $source->dataClass();
$values = $this->Value();
if (!$values) {
return $options;
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}
if (is_array($values)) {
$values = DataList::create($dataClass)->filter('Title', $values);
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}
$ids = $values->column('Title');
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$titleField = $this->getTitleField();
foreach ($source as $object) {
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$options->push(
ArrayData::create(array(
'Title' => $object->$titleField,
'Value' => $object->Title,
'Selected' => in_array($object->Title, $ids),
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))
);
}
return $options;
}
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/**
* {@inheritdoc}
*/
public function setValue($value, $source = null)
{
if ($source instanceof DataObject) {
$name = $this->getName();
if ($source->hasMethod($name)) {
$value = $source->$name()->column('Title');
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}
} elseif ($value instanceof SS_List) {
$value = $value->column('Title');
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}
if (!is_array($value)) {
return parent::setValue($value);
}
return parent::setValue(array_filter($value));
}
/**
* {@inheritdoc}
*/
public function getAttributes()
{
return array_merge(
parent::getAttributes(),
[
'name' => $this->getName() . '[]',
'style'=> 'width: 100%'
]
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);
}
/**
* {@inheritdoc}
*/
public function saveInto(DataObjectInterface $record)
{
parent::saveInto($record);
$name = $this->getName();
$titleField = $this->getTitleField();
$source = $this->getSource();
$values = $this->Value();
$relation = $record->$name();
$ids = array();
if (!$values) {
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$values = array();
}
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if (empty($record) || empty($titleField)) {
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return;
}
if (!$record->hasMethod($name)) {
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throw new Exception(
sprintf("%s does not have a %s method", get_class($record), $name)
);
}
foreach ($values as $key => $value) {
// Get or create record
$record = $this->getOrCreateTag($value);
if ($record) {
$ids[] = $record->ID;
$values[$key] = $record->Title;
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}
}
$relation->setByIDList(array_filter($ids));
}
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/**
* Get or create tag with the given value
*
* @param string $term
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* @return DataObject
*/
protected function getOrCreateTag($term)
{
// Check if existing record can be found
/** @var DataList $source */
$source = $this->getSourceList();
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$titleField = $this->getTitleField();
$record = $source
->filter($titleField, $term)
->first();
if ($record) {
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return $record;
}
// Create new instance if not yet saved
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if ($this->getCanCreate()) {
$dataClass = $source->dataClass();
$record = Injector::inst()->create($dataClass);
$record->{$titleField} = $term;
$record->write();
return $record;
} else {
return false;
}
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}
/**
* Returns a JSON string of tags, for lazy loading.
*
* @param HTTPRequest $request
* @return HTTPResponse
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*/
public function suggest(HTTPRequest $request)
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{
$tags = $this->getTags($request->getVar('term'));
$response = new HTTPResponse();
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$response->addHeader('Content-Type', 'application/json');
$response->setBody(json_encode(array('items' => $tags)));
return $response;
}
/**
* Returns array of arrays representing tags.
*
* @param string $term
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* @return array
*/
protected function getTags($term)
{
/**
* @var array $source
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*/
$source = $this->getSourceList();
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$titleField = $this->getTitleField();
$query = $source
->filter($titleField . ':PartialMatch:nocase', $term)
->sort($titleField)
->limit($this->getLazyLoadItemLimit());
// Map into a distinct list
$items = array();
$titleField = $this->getTitleField();
foreach ($query->map('ID', $titleField) as $id => $title) {
$items[$title] = array(
'id' => $title,
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'text' => $title
);
}
return array_values($items);
}
/**
* DropdownField assumes value will be a scalar so we must
* override validate. This only applies to Silverstripe 3.2+
*
* @param Validator $validator
* @return bool
*/
public function validate($validator)
{
return true;
}
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/**
* Converts the field to a readonly variant.
*
* @return TagField_Readonly
*/
public function performReadonlyTransformation()
{
$copy = $this->castedCopy(ReadonlyTagField::class);
$copy->setSourceList($this->getSourceList());
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return $copy;
}
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}