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<?php |
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namespace SilverStripe\Forms; |
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use ArrayAccess; |
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/** |
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* Represents the base class for a single-select field |
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*/ |
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abstract class SingleSelectField extends SelectField |
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{ |
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/** |
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* Show the first <option> element as empty (not having a value), |
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* with an optional label defined through {@link $emptyString}. |
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* By default, the <select> element will be rendered with the |
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* first option from {@link $source} selected. |
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* |
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* @var bool |
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*/ |
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protected $hasEmptyDefault = false; |
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/** |
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* The title shown for an empty default selection, |
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* e.g. "Select...". |
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* |
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* @var string |
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*/ |
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protected $emptyString = ''; |
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protected $schemaDataType = FormField::SCHEMA_DATA_TYPE_SINGLESELECT; |
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public function getSchemaStateDefaults() |
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{ |
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$data = parent::getSchemaStateDefaults(); |
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// Add options to 'data' |
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$data['data']['hasEmptyDefault'] = $this->getHasEmptyDefault(); |
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$data['data']['emptyString'] = $this->getHasEmptyDefault() ? $this->getEmptyString() : null; |
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$data['value'] = $this->getDefaultValue(); |
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return $data; |
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} |
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public function getDefaultValue() |
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{ |
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$value = $this->Value(); |
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// assign value to field, such as first option available |
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if ($value === null) { |
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if ($this->getHasEmptyDefault()) { |
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$value = ''; |
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} else { |
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$values = $this->getValidValues(); |
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$value = array_shift($values); |
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} |
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} |
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return $value; |
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} |
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/** |
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* @param boolean $bool |
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* @return self Self reference |
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*/ |
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public function setHasEmptyDefault($bool) |
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{ |
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$this->hasEmptyDefault = $bool; |
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return $this; |
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} |
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/** |
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* @return bool |
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*/ |
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public function getHasEmptyDefault() |
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{ |
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return $this->hasEmptyDefault; |
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} |
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/** |
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* Set the default selection label, e.g. "select...". |
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* Defaults to an empty string. Automatically sets |
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* {@link $hasEmptyDefault} to true. |
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* |
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* @param string $string |
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* @return $this |
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*/ |
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public function setEmptyString($string) |
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{ |
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$this->setHasEmptyDefault(true); |
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$this->emptyString = $string; |
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return $this; |
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} |
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/** |
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* @return string |
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*/ |
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public function getEmptyString() |
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{ |
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return $this->emptyString; |
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} |
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/** |
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* Gets the source array, including the empty string, if present |
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* |
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* @return array|ArrayAccess |
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*/ |
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public function getSourceEmpty() |
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{ |
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// Inject default option |
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if ($this->getHasEmptyDefault()) { |
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return array('' => $this->getEmptyString()) + $this->getSource(); |
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} else { |
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return $this->getSource(); |
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} |
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} |
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/** |
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* Validate this field |
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* |
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* @param Validator $validator |
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* @return bool |
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*/ |
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public function validate($validator) |
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{ |
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// Check if valid value is given |
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$selected = $this->Value(); |
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$validValues = $this->getValidValues(); |
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if (strlen($selected)) { |
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// Use selection rules to check which are valid |
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foreach ($validValues as $formValue) { |
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if ($this->isSelectedValue($formValue, $selected)) { |
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return true; |
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} |
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} |
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} else { |
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if ($this->getHasEmptyDefault() || !$validValues || in_array('', $validValues)) { |
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// Check empty value |
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return true; |
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} |
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$selected = '(none)'; |
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} |
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// Fail |
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$validator->validationError( |
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$this->name, |
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_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", |
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array('value' => $selected) |
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), |
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"validation" |
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); |
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return false; |
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} |
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public function castedCopy($classOrCopy) |
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{ |
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$field = parent::castedCopy($classOrCopy); |
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if ($field instanceof SingleSelectField && $this->getHasEmptyDefault()) { |
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$field->setEmptyString($this->getEmptyString()); |
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} |
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return $field; |
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} |
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/** |
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* @return SingleLookupField |
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*/ |
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public function performReadonlyTransformation() |
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{ |
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/** @var SingleLookupField $field */ |
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$field = $this->castedCopy(SingleLookupField::class); |
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$field->setSource($this->getSource()); |
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$field->setReadonly(true); |
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return $field; |
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} |
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} |
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silverstripe /
silverstripe-framework
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.