VS2005+ASP.NET2.0,完整代码贴上,我这方面新手,所以碰到问题一上午没解决。请大家帮帮我!
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><%-- 实验发现html/asp中很容易成功是因为后面的form是用name,而aspx中form要用id--%><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>用javascript验证输入框空白</title>
<script type ="text/javascript">
function check_Null()
{
//var Forms=document.getElementById("form1").elements; if (document.form1.user_id.value=="" || document.form1.user_id.value==null)
{
alert("用户名不能为空!");
return false;
}
if (document.form1.password.value=="" || document.form1.password.value==null)
{
alert("密码不能为空!");
return false;
}
return true;
}
</script>
</head>
<body>
<form id="form1" method="post" action="Login.aspx" onsubmit="return check_Null()">
<table border="0" cellpadding="0" cellspacing="1" style="background-color: #0000FF; border-color: #FFFFFF; margin:0 auto" width="85%">
<tr style="background-color: #E1F3F4; height: 40px">
<td valign="middle" style="background-color:#FFFFFF">
用户名<input type="text" name="user_id" size="13" class="input" />
密码<input type="PassWord" name="password" size="13" class="input" />
<input class="inputbutton" type="submit" value="登 录" name="Submit" />
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><%-- 实验发现html/asp中很容易成功是因为后面的form是用name,而aspx中form要用id--%><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>用javascript验证输入框空白</title>
<script type ="text/javascript">
function check_Null()
{
//var Forms=document.getElementById("form1").elements; if (document.form1.user_id.value=="" || document.form1.user_id.value==null)
{
alert("用户名不能为空!");
return false;
}
if (document.form1.password.value=="" || document.form1.password.value==null)
{
alert("密码不能为空!");
return false;
}
return true;
}
</script>
</head>
<body>
<form id="form1" method="post" action="Login.aspx" onsubmit="return check_Null()">
<table border="0" cellpadding="0" cellspacing="1" style="background-color: #0000FF; border-color: #FFFFFF; margin:0 auto" width="85%">
<tr style="background-color: #E1F3F4; height: 40px">
<td valign="middle" style="background-color:#FFFFFF">
用户名<input type="text" name="user_id" size="13" class="input" />
密码<input type="PassWord" name="password" size="13" class="input" />
<input class="inputbutton" type="submit" value="登 录" name="Submit" />
</td>
</tr>
</table>
</form>
</body>
</html>
==》
document.getElementById("user_id").value==""
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><%-- 实验发现html/asp中很容易成功是因为后面的form是用name,而aspx中form要用id--%><html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>用javascript验证输入框空白</title>
<script type ="text/javascript">
function check_Null() {
if (document.getElementById("txtUid").value == "") {
alert("用户名不能为空!");
return false;
}
if (document.getElementById("txtPwd").value == "") {
alert("密码不能为空!");
return false;
}
return true;
}
</script>
</head>
<body>
<form id="form1" method="post" action="Login.aspx" onsubmit="return check_Null()">
<table border="0" cellpadding="0" cellspacing="1" style="background-color: #0000FF; border-color: #FFFFFF; margin:0 auto" width="85%">
<tr style="background-color: #E1F3F4; height: 40px">
<td valign="middle" style="background-color:#FFFFFF">
用户名<input type="text" id="txtUid" name="user_id" size="13" class="input" />
密码<input type="password" id="txtPwd" name="password" size="13" class="input" />
<input class="inputbutton" type="submit" value="登 录" name="Submit" />
</td>
</tr>
</table>
</form>
</body>
</html>