AttributeBoolean

A class that defines a type of boolean HTML attribute.

Boolean HTML attributes are not attributes with values of TRUE/FALSE. They are attributes that if they exist in the tag, they are TRUE. Examples include selected, disabled, checked, readonly.

To set a boolean attribute on the Attribute class, set it to TRUE.

 $attributes = new Attribute();
 $attributes['disabled'] = TRUE;
 echo '<select' . $attributes . '/>';
 // produces <select disabled>;
 $attributes['disabled'] = FALSE;
 echo '<select' . $attributes . '/>';
 // produces <select>;

Hierarchy

See also

\Drupal\Core\Template\Attribute

File

core/lib/Drupal/Core/Template/AttributeBoolean.php, line 27

Namespace

Drupal\Core\Template

Members

Name Modifiers Type Description
AttributeBoolean::render public function Returns a string representation of the attribute. Overrides AttributeValueBase::render
AttributeBoolean::__toString public function Implements the magic __toString() method. Overrides AttributeValueBase::__toString
AttributeValueBase::$name protected property The name of the value.
AttributeValueBase::$value protected property The value itself.
AttributeValueBase::RENDER_EMPTY_ATTRIBUTE constant Renders '$name=""' if $value is an empty string.
AttributeValueBase::value public function Returns the raw value.
AttributeValueBase::__construct public function Constructs a \Drupal\Core\Template\AttributeValueBase object.
doc_Drupal
2016-10-29 08:45:07
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