formelement.php

讲的是网络编程

<?php
// $Id: formelement.php 1158 2007-12-08 06:24:20Z phppp $
//  ------------------------------------------------------------------------ //
//                XOOPS - PHP Content Management System                      //
//                    Copyright (c) 2000 XOOPS.org                           //
//                       <http://www.xoops.org/>                             //
//  ------------------------------------------------------------------------ //
//  This program is free software; you can redistribute it and/or modify     //
//  it under the terms of the GNU General Public License as published by     //
//  the Free Software Foundation; either version 2 of the License, or        //
//  (at your option) any later version.                                      //
//                                                                           //
//  You may not change or alter any portion of this comment or credits       //
//  of supporting developers from this source code or any supporting         //
//  source code which is considered copyrighted (c) material of the          //
//  original comment or credit authors.                                      //
//                                                                           //
//  This program is distributed in the hope that it will be useful,          //
//  but WITHOUT ANY WARRANTY; without even the implied warranty of           //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            //
//  GNU General Public License for more details.                             //
//                                                                           //
//  You should have received a copy of the GNU General Public License        //
//  along with this program; if not, write to the Free Software              //
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA //
//  ------------------------------------------------------------------------ //
// Author: Kazumi Ono (AKA onokazu)                                          //
// URL: http://www.myweb.ne.jp/, http://www.xoops.org/, http://jp.xoops.org/ //
// Project: The XOOPS Project                                                //
// ------------------------------------------------------------------------- //
if (!defined('XOOPS_ROOT_PATH')) {
	die("XOOPS root path not defined");
}
/**
 * 
 * 
 * @package     kernel
 * @subpackage  form
 * 
 * @author	    Kazumi Ono	<[e-mail]>
 * @author      Taiwen Jiang    <[e-mail]>
 * @copyright	copyright (c) 2000-2007 XOOPS.org
 */


/**
 * Abstract base class for form elements
 * 
 * @author	Kazumi Ono	<[e-mail]>
 * @author  Taiwen Jiang    <[e-mail]>
 * @copyright	copyright (c) 2000-2007 XOOPS.org
 * 
 * @package     kernel
 * @subpackage  form
 */
class XoopsFormElement {

	/**
     * Javascript performing additional validation of this element data
	 *
	 * This property contains a list of Javascript snippets that will be sent to
	 * XoopsForm::renderValidationJS().
	 * NB: All elements are added to the output one after the other, so don't forget
	 * to add a ";" after each to ensure no Javascript syntax error is generated.
     * 
	 * @var array()  
	 */
	var $customValidationCode = array();

	/**#@+
	 * @access private
	 */
	/**
     * "name" attribute of the element
	 * @var string  
	 */
	var $_name;

	/**
	 * caption of the element
	 * @var	string
	 */
	var $_caption;

	/**
	 * Accesskey for this element
	 * @var	string
	 */
	var $_accesskey = '';

	/**
	 * HTML classes for this element
	 * @var	array
	 */
	var $_class = array();

	/**
	 * hidden?
	 * @var	bool
	 */
	var $_hidden = false;

	/**
	 * extra attributes to go in the tag
	 * @var	array
	 */
	var $_extra = array();

	/**
	 * required field?
	 * @var	bool
	 */
	var $_required = false;

	/**
	 * description of the field
	 * @var	string
	 */
	var $_description = "";
	/**#@-*/


	/**
	 * constructor
	 *
	 */
	function XoopsFormElement(){
		exit("This class cannot be instantiated!");
	}

	/**
	 * Is this element a container of other elements?
	 *
	 * @return	bool false
	 */
	function isContainer()
	{
		return false;
	}

	/**
	 * set the "name" attribute for the element
	 *
	 * @param	string  $name   "name" attribute for the element
	 */
	function setName($name) {
		$this->_name = trim($name);
	}

	/**
	 * get the "name" attribute for the element
	 *
	 * @param	bool    encode?
	 * @return	string  "name" attribute
	 */
	function getName($encode = true) {
		if (false != $encode) {
			return str_replace("&amp;", "&", htmlspecialchars($this->_name, ENT_QUOTES));
		}
		return $this->_name;
	}

	/**
	 * set the "accesskey" attribute for the element
	 *
	 * @param	string  $key   "accesskey" attribute for the element
	 */
	function setAccessKey($key) {
		$this->_accesskey = trim($key);
	}
	/**
	 * get the "accesskey" attribute for the element
	 *
	 * @return 	string  "accesskey" attribute value
	 */
	function getAccessKey() {
		return $this->_accesskey;
	}
	/**
	 * If the accesskey is found in the specified string, underlines it
	 *
	 * @param	string  $str   String where to search the accesskey occurence
	 * @return 	string  Enhanced string with the 1st occurence of accesskey underlined
	 */
	function getAccessString( $str ) {
		$access = $this->getAccessKey();
		if ( !empty($access) && ( false !== ($pos = strpos($str, $access)) ) ) {
			return htmlspecialchars(substr($str, 0, $pos), ENT_QUOTES) . '<span style="text-decoration:underline">' . htmlspecialchars(substr($str, $pos, 1), ENT_QUOTES) . '</span>' . htmlspecialchars(substr($str, $pos+1), ENT_QUOTES);
		}
		return htmlspecialchars($str, ENT_QUOTES);
	}

	/**
	 * set the "class" attribute for the element
	 *
	 * @param	string  $key   "class" attribute for the element
	 */
	function setClass($class) {
		$class = trim($class);
		if ( !empty($class) ) {
            $this->_class[] = $class;
		}
	}
	/**
	 * get the "class" attribute for the element
	 *
	 * @return 	string  "class" attribute value
	 */
	function getClass() {
    	if( empty($this->_class) ) return '';
    	$class = array();
    	foreach ($this->_class as $class) {
        	$class[] = htmlspecialchars($class, ENT_QUOTES);
    	}
		return implode(" ", $class);
	}

	/**
	 * set the caption for the element
	 *
	 * @param	string  $caption
	 */
	function setCaption($caption) {
		$this->_caption = trim($caption);
	}

	/**
	 * get the caption for the element
	 *
	 * @param	bool    $encode To sanitizer the text?
	 * @return	string
	 */
	function getCaption($encode = false) {
		return $encode ? htmlspecialchars($this->_caption, ENT_QUOTES) : $this->_caption;
	}

	/**
	 * set the element's description
	 *
	 * @param	string  $description
	 */
	function setDescription($description) {
		$this->_description = trim($description);
	}

	/**
	 * get the element's description
	 *
	 * @param	bool    $encode To sanitizer the text?
	 * @return	string
	 */
	function getDescription($encode = false) {
		return $encode ? htmlspecialchars($this->_description, ENT_QUOTES) : $this->_description;
	}

	/**
	 * flag the element as "hidden"
	 *
	 */
	function setHidden() {
		$this->_hidden = true;
	}

	/**
	 * Find out if an element is "hidden".
	 *
	 * @return	bool
	 */
	function isHidden() {
		return $this->_hidden;
	}

	/**
	 * Find out if an element is required.
	 *
	 * @return	bool
	 */
	function isRequired() {
		return $this->_required;
	}

	/**
	 * Add extra attributes to the element.
	 *
	 * This string will be inserted verbatim and unvalidated in the
	 * element's tag. Know what you are doing!
	 *
	 * @param	string  $extra
	 * @param   string  $replace If true, passed string will replace current content otherwise it will be appended to it
	 * @return	array   New content of the extra string
	 */
	function setExtra($extra, $replace = false) {
		if ( $replace) {
			$this->_extra = array( trim($extra) );
		} else {
			$this->_extra[] = trim($extra);
		}
		return $this->_extra;
	}

	/**
	 * Get the extra attributes for the element
	 *
	 * @param	bool    $encode To sanitizer the text?
	 * @return	string
	 */
	function getExtra($encode = false) {
    	if (!$encode) {
        	return implode(' ', $this->_extra);
    	}
    	$value = array();
    	foreach ($this->_extra as $val) {
		    $value[] = str_replace('>', '&gt;', str_replace('<', '&lt;', $val));
    	}
    	return empty($value) ? "" : " ".implode(' ', $value);
	}

	/**
	 * Render custom javascript validation code
	 *
	 * @seealso XoopsForm::renderValidationJS
	*/
	function renderValidationJS() {
    	// render custom validation code if any
		if ( !empty( $this->customValidationCode ) ) {
			return implode( "\n", $this->customValidationCode );
		// generate validation code if required 
		} elseif ($this->isRequired()) {
			$eltname    = $this->getName();
			$eltcaption = $this->getCaption();
			$eltmsg = empty($eltcaption) ? sprintf( _FORM_ENTER, $eltname ) : sprintf( _FORM_ENTER, $eltcaption );
			$eltmsg = str_replace('"', '\"', stripslashes( $eltmsg ) );
			return "if ( myform.{$eltname}.value == \"\" ) { window.alert(\"{$eltmsg}\"); myform.{$eltname}.focus(); return false; }";
		}
		return ''; 
	}

	/**
	 * Generates output for the element.
	 *
	 * This method is abstract and must be overwritten by the child classes.
	 * @abstract
	 */
	function render(){
	}
}
?>