javascript

提交表单之前对表单进行检查的方法 onsubmit='return checkSubmit()' 

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<!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>  
<meta http-equiv="Content-Type" content="text/html; charset=<?php echo $cfg_soft_lang; ?>" />  
<title>更改帐号基本资料 - 会员中心 - <?php echo $cfg_webname; ?></title>  
<script type="text/javascript">    
function checkSubmit()  
{  
    if(document.form2.oldpwd.value=='')  
    {  
        document.form2.oldpwd.focus();  
        alert("旧密码必须填写！");  
        return false;  
    }  
    if(document.form2.userpwdok.value!=document.form2.userpwd.value)  
    {  
        document.form2.userpwdok.focus();  
        alert("两次密码不一致！");  
        return false;  
    }  
    if(document.form2.email.value=="")  
    {  
        document.form2.email.focus();  
        alert("Email不能为空！");  
        return false;  
    }  
    if(document.form2.uname.value=="")  
    {  
        document.form2.uname.focus();  
        alert("用户昵称不能为空！");  
        return false;  
    }  
    if(document.form2.vdcode.value=="")  
    {  
        document.form2.vdcode.focus();  
        alert("验证码不能为空！");  
        return false;  
    }  
}  
</script>  
</head>  
<body>  
    <!--提交表单前先执行checkSubmit()，检查表单各项是否合规-->  
    <form action="edit_baseinfo.php" method="post" enctype="multipart/form-data" name="form2" onsubmit="return checkSubmit();">  
     <input type="hidden" name="dopost" value="save" />  
        <div class="postForm">  
          <p class="cellBg">  
            <label style="width:90px">昵称：</label>  
            <input name="uname" type="text" id="uname" value="<?php echo $row['uname']; ?>" class="intxt" style="width:100px"/>  
          </p>  
          <p>  
            <label>原登陆密码：</label>  
            <input name="oldpwd" type="password" id="oldpwd" class="intxt" /> <span style="color:red;">*</span>  
          </p>  
          <p class="cellBg">  
            <label>新密码：</label>  
            <input name="userpwd" type="password" id="userpwd" class="intxt" />  
            <span id="_userpwdok">(不修改密码请保留此项为空)</span>  
          </p>checkSubmit()  
          <p>  
            <label>确认新密码：</label>  
            <input name="userpwdok" type="password" id="userpwdok" value="" class="intxt" />  
            <span id="_userpwdok2">(不修改密码请保留此项为空)</span> </span>  
          </p>  
          <p class="cellBg">  
            <label><span class="tdl">电子邮箱</span>：</label>  
            <input name="email" type="text" id="email" value="<?php echo $row['email']; ?>" class="intxt"/><br>  
            <span id="_email" style="margin-left:80px"> <span style="color:red;">*</span> (每个电子邮邮箱只能注册一个帐号，要修改电子邮箱必须填写正确安全问题的答案)</span>   
          </p>  
          <p class="cellBg">  
            <label>验证码：</label>  
            <input name="vdcode" type="text" id="vdcode" style='width:50px;text-transform:uppercase;' class="intxt" />  
           <img src="../include/vdimgck.php" align="absmiddle" alt="看不清？点击更换" style="cursor:pointer" onclick="this.src=this.src+'?'" />  
          </p>  
          <p>  
            <button class="button2" type="submit">更新</button>  
            <button class="button2 ml10" type="reset">重设</button>  
          </p>  
    </div>  
  </form>  
</body>  
</html>

如果是onsubmit="return false;"则是表示阻止表单提交，例：
<form name="form1" method="post" onsubmit="return false;"></from>