HTMLHiddenField.php

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<?php
 
/*
 * @stable to extend
 */
class HTMLHiddenField extends HTMLFormField {
    protected $outputAsDefault = true;
 
    public function __construct( $params ) {
        parent::__construct( $params );
 
        if ( isset( $this->mParams['output-as-default'] ) ) {
            $this->outputAsDefault = (bool)$this->mParams['output-as-default'];
        }
 
        # Per HTML5 spec, hidden fields cannot be 'required'
        # https://www.w3.org/TR/html5/forms.html#hidden-state-%28type=hidden%29
        unset( $this->mParams['required'] );
    }
 
    public function getHiddenFieldData( $value ) {
        $params = [];
        if ( $this->mID ) {
            $params['id'] = $this->mID;
        }
 
        if ( $this->outputAsDefault ) {
            $value = $this->mDefault;
        }
 
        return [ $this->mName, $value, $params ];
    }
 
    public function getTableRow( $value ) {
        [ $name, $value, $params ] = $this->getHiddenFieldData( $value );
        $this->mParent->addHiddenField( $name, $value, $params );
        return '';
    }
 
    public function getDiv( $value ) {
        return $this->getTableRow( $value );
    }
 
    public function getRaw( $value ) {
        return $this->getTableRow( $value );
    }
 
    public function getInputHTML( $value ) {
        return '';
    }
 
    public function canDisplayErrors() {
        return false;
    }
 
    public function hasVisibleOutput() {
        return false;
    }
}