silverstripe-framework/forms/FormAction.php

<?php

/**
 * Single action button.
 * The action buttons are <input type="submit"> tags.
 */
class FormAction extends FormField {
	protected $extraData;
	
	/**
	 * Create a new action button.
	 * @param action The method to call when the button is clicked
	 * @param title The label on the button
	 * @param form The parent form, auto-set when the field is placed inside a form 
	 * @param extraData A piece of extra data that can be extracted with $this->extraData.  Useful for
	 *                  calling $form->buttonClicked()->extraData()
	 */
	function __construct($action, $title = "", $form = null, $extraData = null) {
		$this->extraData = $extraData;
		parent::__construct("action_$action", $title, null, $form);
	}
	static function create($action, $title = "") {
		return new FormAction($action, $title);
	}
	
	function actionName() {
		return substr($this->name,7);
	}
	function extraData() {
		return $this->extraData;
	}
	
	function Field() {
		$titleAttr = $this->description ? "title=\"" . Convert::raw2att($this->description) . "\"" : '';
		return "<input class=\"action" . $this->extraClass() . "\" id=\"" . $this->id() . "\" type=\"submit\" name=\"{$this->name}\" value=\"" . $this->attrTitle() . "\" $titleAttr />";
	}
	
	/**
	 * Does not transform to readonly by purpose.
	 * Globally disabled buttons would break the CMS.
	 */
	function performReadonlyTransformation() {
		return $this;
	}
	
	function readonlyField() {
		return $this;
	}
}

class FormAction_WithoutLabel extends FormAction {
	function Title(){
		return null;
	}
}
?>