javascript判断提交的表单

javascript判断提交的表单,程序如下：
<%-- 
    Document   : index
    Created on : 2008-7-25, 8:55:46
    Author     : Administrator
--%><%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd"><html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>用户注册</title>
    </head>
    <body>
        <script language="javascript">
            function IsDigit(cCheck){
                return (('0'<=cCheck)&&(cCheck<='9'));
            }
            function IsPlpha(cCheck){
                return ((('a'<=cCheck)&&(cCheck<='z'))||(('A'<=cCheck)&&(cCheck<='Z')));
            }
            function IsVaild(){
                var struserName=reg.UserName.value;
                for(nIndex=0;nIndex<struserName;nIndex++){
                    if(!(IsDigit(cCheck)||IsAlpha(cCheck))){
                        return false;
                    }
                }
                return true;
            }
            function chkEmail(str){
                return str.search(/[\w\-]{1,}@[\w\-]{1,}.[\w\-]{1,}/)==0?true:false;
            }
            
            function docheck(){
                if(reg.UserName.value==""){
                    alert("请填写用户名");
                    return false;
                }
                else if(!IsValid()){
                    alert("用户名只能为数字或者是字母");
                    return false;
                }
                else if(reg.UserPassword.value==""){
                    alert("请填写密码");
                    return false;
                }
                else if(reg.UserPassword.value!=reg.CUserPassword.value){
                    alert("两次密码不一致");
                    return false;
                }
                else if(reg.NickName==""){
                    alert("填写昵称");
                    return false;
                }
                else if(reg.Email.value==""){
                   alert("填写邮箱");
                    return false; 
                }
                else if(!chkEmail(reg.Email.value)){
                    alert("请填写有效的邮箱");
                    return false;
                }
                else{
                    return true;
                }
            }
        </script>
        <h1 align="center">用户注册</h1>
<div align="center">
<form name="reg" action="user_add.jsp" method="post" target="_self" onSubmit="return docheck()">
<table width="90%" border="1">
  <tr>
    <td width="50%" align="right" height="25">请输入要注册的用户名:</td>
    <td width="50%" height="25">&nbsp;<input type="text" name="UserName"><br><font color="red">&nbsp;用户名只能由数字和字母组成</font></td>
  </tr>
  <tr>
    <td align="right" height="25" width="50%">请输入密码：</td>
    <td width="50%" height="25">&nbsp;<input type="password" name="UserPassword"></td>
  </tr>
  <tr>
    <td width="50%" align="right" height="25">请输入确认密码：</td>
    <td width="50%" height="25">&nbsp;<input type="password" name="CUserPassword"></td>
  </tr>
  <tr>
    <td width="50%" align="right" height="25">请输入昵称：</td>
    <td width="50%" height="25">&nbsp;<input type="text" name="NichName"></td>
  </tr>
  <tr>
    <td width="50%" align="right" height="25">请选择性别：</td>
    <td width="50%" height="25">&nbsp;<input type="radio" name="Sex" value="0" checked>男&nbsp;<input type="radio" name="Sex" value="1">女</td>
  </tr>
  <tr>
    <td width="50%" align="right" height="25">请输入Email地址：</td>
    <td width="50%" height="25">&nbsp;<input type="text" name="Email"></td>
  </tr>
</table>
<p>
<input type="submit" name="sub" value="注册">&nbsp;&nbsp;&nbsp;&nbsp;
<input type="reset" name="res" value="重填">
</p>
</form>
</div>
    </body>
</html>
我在运行表单的时候，JavaScript就没有起到作用啊，不晓得是那里出错了啊？

解决方案 »

  1.   

    此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
    楼主【qunqun886】截止到2008-07-25 10:53:48的历史汇总数据(不包括此帖)：
    发帖的总数量:4                        发帖的总分数:80                       每贴平均分数:20                       
    回帖的总数量:1                        得分贴总数量:0                        回帖的得分率:0%                       
    结贴的总数量:4                        结贴的总分数:80                       
    无满意结贴数:0                        无满意结贴分:0                        
    未结的帖子数:0                        未结的总分数:0                        
    结贴的百分比:100.00%               结分的百分比:100.00%                  
    无满意结贴率:0.00  %               无满意结分率:0.00  %                  
    敬礼!
      

  2.   

    能不能 <input type="button" name="sub" value="注册" onClick="docheck()">
    <form name="reg" action="user_add.jsp" method="post" target="_self" >
    把这两个地方先改改 看你的脚本能起作用不？
      

  3.   

     else if(!IsValid()){ 
       alert("用户名只能为数字或者是字母"); 
      return false; 
    } function IsVaild(){ 
           var struserName=reg.UserName.value; 
                    for(nIndex=0;nIndex <struserName;nIndex++){ 
                        if(!(IsDigit(cCheck) ¦ ¦IsAlpha(cCheck))){ 
                            return false; 
                        } 
                    } 
    return true; 
    } 这2个方法名不一致
      

  4.   

    IsPlpha还有这个名字
      

  5.   

    <%@page contentType="text/html" pageEncoding="UTF-8"%> 
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
      "http://www.w3.org/TR/html4/loose.dtd"> <html> 
        <head> 
            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
            <title>用户注册 </title> 
        </head> 
        <body> 
       
            <h1 align="center">用户注册 </h1> 
    <div align="center">     <script language="javascript"> 
                function IsDigit(cCheck){ 
                    return (('0' <=cCheck)&&(cCheck <='9')); 
                }             function IsPlpha(cCheck){ 
                    return ((('a' <=cCheck)&&(cCheck <='z'))||(('A' <=scCheck)&&(cCheck <='Z'))); 
                } 
                function IsVaild(){
                    var struserName=reg.UserName.value; 
                    for(nIndex=0;nIndex<struserName;nIndex++){ 
                     if(!(IsDigit(cCheck)||IsPlpha(cCheck))){
                            return false; 
                      } 
                  } 
                   return true; 
                } 
                function chkEmail(str){ 
                    return str.search(/[\w\-]{1,}@[\w\-]{1,}.[\w\-]{1,}/)==0?true:false; 
                } 
                
                function docheck(){ 
                    if(reg.UserName.value==""){ 
                        alert("请填写用户名"); 
                        return false; 
                    }else if(!IsVaild()){ 
                        alert("用户名只能为数字或者是字母"); 
                        return false; 
                    } 
                    else if(reg.UserPassword.value==""){ 
                        alert("请填写密码"); 
                        return false; 
                    } 
                    else if(reg.UserPassword.value!=reg.CUserPassword.value){ 
                        alert("两次密码不一致"); 
                        return false; 
                    } 
                    else if(reg.NickName==""){ 
                        alert("填写昵称"); 
                        return false; 
                    } 
                    else if(reg.Email.value==""){ 
                      alert("填写邮箱"); 
                        return false; 
                    } 
                    else if(!chkEmail(reg.Email.value)){ 
                        alert("请填写有效的邮箱"); 
                        return false; 
                    } 
                    else{ 
                        return true; 
                    } 
                } 
            </script> 
    <form name="reg" action="user_add.jsp" method="post"  onSubmit="return docheck();"> 
    <table width="90%" border="1"> 
      <tr> 
        <td width="50%" align="right" height="25">请输入要注册的用户名: </td> 
        <td width="50%" height="25">&nbsp; <input type="text" name="UserName"> <br> <font color="red">&nbsp;用户名只能由数字和字母组成 </font> </td> 
      </tr> 
      <tr> 
        <td align="right" height="25" width="50%">请输入密码： </td> 
        <td width="50%" height="25">&nbsp; <input type="password" name="UserPassword"> </td> 
      </tr> 
      <tr> 
        <td width="50%" align="right" height="25">请输入确认密码： </td> 
        <td width="50%" height="25">&nbsp; <input type="password" name="CUserPassword"> </td> 
      </tr> 
      <tr> 
        <td width="50%" align="right" height="25">请输入昵称： </td> 
        <td width="50%" height="25">&nbsp; <input type="text" name="NichName"> </td> 
      </tr> 
      <tr> 
        <td width="50%" align="right" height="25">请选择性别： </td> 
        <td width="50%" height="25">&nbsp; <input type="radio" name="Sex" value="0" checked>男&nbsp; <input type="radio" name="Sex" value="1">女 </td> 
      </tr> 
      <tr> 
        <td width="50%" align="right" height="25">请输入Email地址： </td> 
        <td width="50%" height="25">&nbsp; <input type="text" name="Email"> </td> 
      </tr> 
    </table> 
    <p> 
    <input type="submit" name="sub" value="注册">&nbsp;&nbsp;&nbsp;&nbsp; 
    <input type="reset" name="res" value="重填"> 
    </p> 
    </form> 
    </div> 
        </body> 
    </html> 我测试过了 现在应该可以了