提交表单之前对表单进行检查的方法 onsubmit="return checkSubmit();"
<!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>
