silverstripe-framework/src/Forms/SingleSelectField.php

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<?php
namespace SilverStripe\Forms;
use ArrayAccess;
/**
* Represents the base class for a single-select field
*/
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abstract class SingleSelectField extends SelectField
{
/**
* 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.
*
* @var bool
*/
protected $hasEmptyDefault = false;
/**
* The title shown for an empty default selection,
* e.g. "Select...".
*
* @var string
*/
protected $emptyString = '';
protected $schemaDataType = FormField::SCHEMA_DATA_TYPE_SINGLESELECT;
public function getSchemaStateDefaults()
{
$data = parent::getSchemaStateDefaults();
$data['value'] = $this->getDefaultValue();
return $data;
}
public function getSchemaDataDefaults()
{
$data = parent::getSchemaDataDefaults();
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// Add options to 'data'
$data['data']['hasEmptyDefault'] = $this->getHasEmptyDefault();
$data['data']['emptyString'] = $this->getHasEmptyDefault() ? $this->getEmptyString() : null;
return $data;
}
public function getDefaultValue()
{
$value = $this->Value();
// assign value to field, such as first option available
if ($value === null) {
if ($this->getHasEmptyDefault()) {
$value = '';
} else {
$values = $this->getValidValues();
$value = array_shift($values);
}
}
return $value;
}
/**
* @param boolean $bool
* @return self Self reference
*/
public function setHasEmptyDefault($bool)
{
$this->hasEmptyDefault = $bool;
return $this;
}
/**
* @return bool
*/
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 $string
* @return $this
*/
public function setEmptyString($string)
{
$this->setHasEmptyDefault(true);
$this->emptyString = $string;
return $this;
}
/**
* @return string
*/
public function getEmptyString()
{
return $this->emptyString;
}
/**
* Gets the source array, including the empty string, if present
*
* @return array|ArrayAccess
*/
public function getSourceEmpty()
{
// Inject default option
if ($this->getHasEmptyDefault()) {
return ['' => $this->getEmptyString()] + $this->getSource();
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} else {
return $this->getSource();
}
}
/**
* Validate this field
*
* @param Validator $validator
* @return bool
*/
public function validate($validator)
{
// Check if valid value is given
$selected = $this->Value();
$validValues = $this->getValidValues();
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if (strlen($selected ?? '')) {
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// Use selection rules to check which are valid
foreach ($validValues as $formValue) {
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if ($this->isSelectedValue($formValue, $selected)) {
return true;
}
}
} else {
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if ($this->getHasEmptyDefault() || !$validValues || in_array('', $validValues ?? [])) {
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// Check empty value
return true;
}
$selected = '(none)';
}
// Fail
$validator->validationError(
$this->name,
_t(
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'SilverStripe\\Forms\\DropdownField.SOURCE_VALIDATION',
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"Please select a value within the list provided. {value} is not a valid option",
['value' => $selected]
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),
"validation"
);
return false;
}
public function castedCopy($classOrCopy)
{
$field = parent::castedCopy($classOrCopy);
if ($field instanceof SingleSelectField && $this->getHasEmptyDefault()) {
$field->setEmptyString($this->getEmptyString());
}
return $field;
}
/**
* @return SingleLookupField
*/
public function performReadonlyTransformation()
{
/** @var SingleLookupField $field */
$field = $this->castedCopy(SingleLookupField::class);
$field->setSource($this->getSource());
$field->setReadonly(true);
return $field;
}
}