praiadeseselle/wire/modules/Inputfield/InputfieldHidden.module

<?php namespace ProcessWire;

/**
 * An Inputfield for handling HTML “hidden” form inputs
 * 
 * ProcessWire 3.x, Copyright 2021 by Ryan Cramer
 * https://processwire.com
 * 
 * @property bool $renderValueAsInput Render the hidden input, even when in renderValue mode (default=false)
 * @property string $initValue Initial populated value if value attribute not separately populated (default='')
 *
 */
class InputfieldHidden extends Inputfield {

	public static function getModuleInfo() {
		return array(
			'title' => __('Hidden', __FILE__), // Module Title
			'version' => 101,
			'summary' => __('Hidden value in a form', __FILE__), // Module Summary
			'permanent' => true, 
		);
	}

	/**
	 * Construct
	 * 
	 */
	public function __construct() {
		parent::__construct();
		$this->setAttribute('type', 'hidden'); 
		$this->set('renderValueAsInput', false);
		$this->initValue = '';
	}

	/**
	 * Render
	 * 
	 * @return string
	 * 
	 */
	public function ___render() {
		return "<input " . $this->getAttributesString() . " />"; 
	}

	/**
	 * Render value
	 * 
	 * @return string
	 * 
	 */
	public function ___renderValue() {
		if($this->renderValueAsInput) {
			return $this->render();
		} else {
			return parent::___renderValue();
		}
	}

	/**
	 * Get attributes
	 * 
	 * @return array
	 * 
	 */
	public function getAttributes() {
		$attrs = parent::getAttributes();
		if(!strlen("$attrs[value]") && $this->initValue) $attrs['value'] = (string) $this->initValue; 
		return $attrs; 
	}

	/**
	 * Configure Inputfield
	 * 
	 * @return InputfieldWrapper
	 * 
	 */
	public function ___getConfigInputfields() {

		$inputfields = parent::___getConfigInputfields();

		// remove config fields that don't need to be here
		$f = $inputfields->getChildByName('collapsed');
		$inputfields->remove($f); 
		$f = $inputfields->getChildByName('columnWidth');
		$inputfields->remove($f); 

		/** @var InputfieldText $field */
		$field = $this->wire()->modules->get('InputfieldText');
		$field->setAttribute('name', 'initValue'); 
		$field->label = $this->_('Value');
		$field->description = $this->_('Value to be populated in this hidden field.'); 
		$field->setAttribute('value', $this->initValue); 
		$inputfields->append($field);
		
		return $inputfields; 
	}
	
}