/*
描述：基于jquery的表單驗(yàn)證插件。
*/

(function ($) {
 $.fn.checkForm = function (options) {
  var root = this; //將當(dāng)前應(yīng)用對(duì)象存入root

  var isok = false; //控制表單提交的開(kāi)關(guān)

  var pwd1; //密碼存儲(chǔ)

  var defaults = {
   //圖片路徑
   img_error: "img/error.gif",
   img_success: "img/success.gif",

   //提示信息
   tips_success: '', //驗(yàn)證成功時(shí)的提示信息，默認(rèn)為空
   tips_required: '不能為空',
   tips_email: '郵箱地址格式有誤',
   tips_num: '請(qǐng)?zhí)顚?xiě)數(shù)字',
   tips_chinese: '請(qǐng)?zhí)顚?xiě)中文',
   tips_mobile: '手機(jī)號(hào)碼格式有誤',
   tips_idcard: '身份證號(hào)碼格式有誤',
   tips_pwdequal: '兩次密碼不一致',

   //正則
   reg_email: /^\w+\@[a-zA-Z0-9]+\.[a-zA-Z]{2,4}$/i, //驗(yàn)證郵箱
   reg_num: /^\d+$/,         //驗(yàn)證數(shù)字
   reg_chinese: /^[\u4E00-\u9FA5]+$/,     //驗(yàn)證中文
   reg_mobile: /^1[3458]{1}[0-9]{9}$/,    //驗(yàn)證手機(jī)
   reg_idcard: /^\d{14}\d{3}?\w$/      //驗(yàn)證身份證
  };

  //不為空則合并參數(shù)
  if(options)
   $.extend(defaults, options);

  //獲取（文本框，密碼框，多行文本框），當(dāng)失去焦點(diǎn)時(shí)，對(duì)其進(jìn)行數(shù)據(jù)驗(yàn)證
  $(":text,:password,textarea", root).each(function () {
   $(this).blur(function () {
    var _validate = $(this).attr("check"); //獲取check屬性的值
    if (_validate) {
     var arr = _validate.split(' '); //用空格將其拆分成數(shù)組
     for (var i = 0; i < arr.length; i++) {
      //逐個(gè)進(jìn)行驗(yàn)證，不通過(guò)跳出返回false,通過(guò)則繼續(xù)
      if (!check($(this), arr[i], $(this).val()))
       return false;
      else
       continue;
     }
    }
   })
  })

  //表單提交時(shí)執(zhí)行驗(yàn)證,與上面的方法基本相同，只不過(guò)是在表單提交時(shí)觸發(fā)
  function _onSubmit() {
   isok = true;
   $(":text,:password,textarea", root).each(function () {
    var _validate = $(this).attr("check");
    if (_validate) {
     var arr = _validate.split(' ');
     for (var i = 0; i < arr.length; i++) {
      if (!check($(this), arr[i], $(this).val())) {
       isok = false; //驗(yàn)證不通過(guò)阻止表單提交，開(kāi)關(guān)false
       return; //跳出
      }
     }
    }
   });
  }

  //判斷當(dāng)前對(duì)象是否為表單，如果是表單，則提交時(shí)要進(jìn)行驗(yàn)證
  if (root.is("form")) {
   root.submit(function () {
    _onSubmit();
    return isok;
   })
  }


  //驗(yàn)證方法
  var check = function (obj, _match, _val) {
　　　　　　　//根據(jù)驗(yàn)證情況，顯示相應(yīng)提示信息，返回相應(yīng)的值
   switch (_match) {
    case 'required':
     return _val ? showMsg(obj, defaults.tips_success, true) : showMsg(obj, defaults.tips_required, false);
    case 'email':
     return chk(_val, defaults.reg_email) ? showMsg(obj, defaults.tips_success, true) : showMsg(obj, defaults.tips_email, false);
    case 'num':
     return chk(_val, defaults.reg_num) ? showMsg(obj, defaults.tips_success, true) : showMsg(obj, defaults.tips_num, false);
    case 'chinese':
     return chk(_val, defaults.reg_chinese) ? showMsg(obj, defaults.tips_success, true) : showMsg(obj, defaults.tips_chinese, false);
    case 'mobile':
     return chk(_val, defaults.reg_mobile) ? showMsg(obj, defaults.tips_success, true) : showMsg(obj, defaults.tips_mobile, false);
    case 'idcard':
     return chk(_val, defaults.reg_idcard) ? showMsg(obj, defaults.tips_success, true) : showMsg(obj, defaults.tips_idcard, false);
    case 'pwd1':
     pwd1 = _val; //實(shí)時(shí)獲取存儲(chǔ)pwd1值
     return true;
    case 'pwd2':
     return pwdEqual(_val, pwd1) ? showMsg(obj, defaults.tips_success, true) : showMsg(obj, defaults.tips_pwdequal, false);
    default:
     return true;
   }
  }


  //判斷兩次密碼是否一致(返回bool值)
  var pwdEqual = function(val1, val2) {
   return val1 == val2 ? true : false;
  }


  //正則匹配(返回bool值)
  var chk = function (str, reg) {
   return reg.test(str);
  }

  //顯示信息
  var showMsg = function (obj, msg, mark) {
   $(obj).next("#errormsg").remove();//先清除
   var _html = "<span id='errormsg' style='font-size:13px;color:gray;background:url(" + defaults.img_error + ") no-repeat 0 -1px;padding-left:20px;margin-left:5px;'>" + msg + "</span>";
   if (mark)
    _html = "<span id='errormsg' style='font-size:13px;color:gray;background:url(" + defaults.img_success + ") no-repeat 0 -1px;padding-left:20px;margin-left:5px;'>" + msg + "</span>";
   $(obj).after(_html);//再添加
   return mark;
  }
 }
})(jQuery);

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 <title>表單驗(yàn)證插件</title>
</head>
<body>
 <form id="myform" method="post" action="success.html">
  <ul>
   <li>
   郵箱：<input type="text" name="email" check="required email" />
   </li>
   <li>
   密碼：<input type="password" check="required pwd1" />
   </li>
   <li>
   確認(rèn)密碼：<input type="password" check="required pwd2" />
   </li>
   <li>
   手機(jī)：<input type="text" name="num" check="required mobile" />
   </li>
   <li>
   數(shù)字：<input type="text" name="num" check="required num" />
   </li>
   <li>
   地址：<textarea cols="5" rows="5" check="required"></textarea>
   </li>
   <li>
   不加check驗(yàn)證的文本框：<input type="text" name="num" />
   </li>
  </ul>
  <input type="submit" value="提交" />
 </form>
 <script src="js/jquery-1.4.4.min.js" type="text/javascript"></script>
 <script src="js/jquery.similar.checkForm.js" type="text/javascript"></script>
 <script type="text/javascript">
  $("#myform").checkForm();
 </script>
</body>
</html>