JavaScript显示undefined

以下代码在单击单选按钮时显示undefined警报消息。代码有什么问题？JavaScript显示undefined

控制台错误显示pwdissue是undefined。

<%@page contentType="text/html" pageEncoding="UTF-8"%> 
<html> 
    <head> 
    <% String loginstatus=request.getParameter("loginstatus"); %> 
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 
    <title>LOGIN PAGE</title> 
    <link href="style/style.css" rel="stylesheet" type="text/css" /> 
    <script type="text/javascript" language="javascript">

 function pwd(){ 
      var a=pwdissue.value; 
      alert(a); 
     } 
     function validate(uname,pwd){ 
      var username,password; 
      username=uname.value; 
      password=pwd.value; 
      if(username=="" && password==""){ 
       alert("Please enter your username and password"); 
      }else if(username=="") 
       alert("Username filed shouldn't be empty"); 
      else if(password=="") 
       alert("Password filed shouldn't be empty"); 
      else{ 
       return true; 
      } 
      return false; 
     }

</script> 
</head> 
<body> 
    <center> 
    java 
     <div style="border-bottom:1px solid #DEDEDE; border-left:1px solid #DEDEDE; width:1090px;"> 
      <div class="heading-bg">SALES FORCE TRACKING SYSTEM</div> 
      <div class="main"> 
       <%if(loginstatus!=null && loginstatus.equals("mismatch")){ 
        %><h1 class="errormessage">INVALID USERNAME OR PASSWORD.</h1><% 
       }%> 
       <form name="loginform" onsubmit="return validate(uname,pwd,passwordissues)" action="loginpagevalidation.jsp"> 
         <table name="logintable"> 
          <caption>SignIn Here</caption> 
          <tr><td>UserName</td><td><input type="text" name="uname" /></td></tr> 
          <tr><td>Password</td><td><input type="password" name="pwd"/></td></tr> 
          <tr><td></td><td><input type="submit" name="submit" value="SIGNIN"/><input type="reset" onclick="managersigning.html" name="reset" value="RESET"/></td></tr> 
          <tr><td></td><td><a href="signuppage.html"> Click here to SingUp</a></td></tr> 
         <!--  <tr><td></td><td>Forget Password ?<a href="passwordrecovery.jsp">Click here</a></td></tr> --> 
         </table> 
       </form> 
        <input type="radio" name="pwdissue" onclick="javascript:pwd()" value="forget"/>Forget Password 
        <input type="radio" name="pwdissue" onclick="javascript:pwd()" value="reset"/>Reset Password 
      </div> 
     </div> 
    </center> 
</body> 
</html>

来源

2011-10-23 RAVITEJA SATYAVADA

变化都onclick是这个：

onclick="javascript:pwd(this)"

然后更改的功能：

function pwd(sender) { 
     var a = sender.value; 
     alert(a); 
}

单选按钮名称不是全局上下文的一部分，浏览器不会为您找到它，所以最简单的方法是将对象本身传递给函数。

来源

2011-10-23 13:35:16

function pwd(o){ 
     var a=o.value; 
     alert(a); 
    } 

    <input type="radio" name="pwdissue" onclick="pwd(this)" value="forget"/>

来源

2011-10-23 13:35:46 cuzzea

JavaScript显示undefined

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