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分享登陆界面点用户名和密码后,如果用户名为空,提示"用户名不能为空",我下面的代码怎么运行后没有反映啊?(刚学,请指教)
<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %>
<!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=gb2312">
<title>无标题文档</title>
<script language="javascript">
function abc()
{
if(form1.textfield1.value=="")
{
window.alert("用户名不能为空！");
form1.textfield1.focus();
}
}
</script>
</head>
<body><form action="" method="post">
<div align="center">
<table width="255" border="0">
<tr>
<td width="69" height="39">用户名：</td>
<td width="176"><input type="text" name="textfield1"></td>
</tr>
<tr>
<td height="47">密 码：</td>
<td><input type="text" name="textfield2"></td>
</tr>
<tr>
<td height="41" colspan="2"><div align="center">
<input type="submit" name="Submit" value="提交" onClick="abc()">
<input type="reset" name="Submit" value="清空">
</div></td>
</tr>
</table>
</div>
</form>
</body>
</html>
<!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=gb2312">
<title>无标题文档</title>
<script language="javascript">
function abc()
{
if(form1.textfield1.value=="")
{
window.alert("用户名不能为空！");
form1.textfield1.focus();
}
}
</script>
</head>
<body><form action="" method="post">
<div align="center">
<table width="255" border="0">
<tr>
<td width="69" height="39">用户名：</td>
<td width="176"><input type="text" name="textfield1"></td>
</tr>
<tr>
<td height="47">密 码：</td>
<td><input type="text" name="textfield2"></td>
</tr>
<tr>
<td height="41" colspan="2"><div align="center">
<input type="submit" name="Submit" value="提交" onClick="abc()">
<input type="reset" name="Submit" value="清空">
</div></td>
</tr>
</table>
</div>
</form>
</body>
</html>
...全文
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lovebeyondforever 2006-05-15
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<%@ Page Language="C#" ContentType="text/html" ResponseEncoding="gb2312" %>
<!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=gb2312">
<title>无标题文档</title>
<script language="javascript">
function abc()
{
if(form1.textfield1.value=="")
{
window.alert("用户名不能为空！");
form1.textfield1.focus();
}
}
</script>
</head>
<body><form action="" method="post" name="form1">
<div align="center">
<table width="255" border="0">
<tr>
<td width="69" height="39">用户名：</td>
<td width="176"><input type="text" name="textfield1"></td>
</tr>
<tr>
<td height="47">密 码：</td>
<td><input type="text" name="textfield2"></td>
</tr>
<tr>
<td height="41" colspan="2"><div align="center">
<input type="submit" name="Submit" value="提交" onClick="abc()">
<input type="reset" name="Submit" value="清空">
</div></td>
</tr>
</table>
</div>
</form>
</body>
</html>
<!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=gb2312">
<title>无标题文档</title>
<script language="javascript">
function abc()
{
if(form1.textfield1.value=="")
{
window.alert("用户名不能为空！");
form1.textfield1.focus();
}
}
</script>
</head>
<body><form action="" method="post" name="form1">
<div align="center">
<table width="255" border="0">
<tr>
<td width="69" height="39">用户名：</td>
<td width="176"><input type="text" name="textfield1"></td>
</tr>
<tr>
<td height="47">密 码：</td>
<td><input type="text" name="textfield2"></td>
</tr>
<tr>
<td height="41" colspan="2"><div align="center">
<input type="submit" name="Submit" value="提交" onClick="abc()">
<input type="reset" name="Submit" value="清空">
</div></td>
</tr>
</table>
</div>
</form>
</body>
</html>
samjuly 2006-05-15
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<script language="javascript">
function abc()
{
if(form1.textfield1.value=="")
{
window.alert("用户名不能为空！");
form1.textfield1.focus();
}
form1.submit
}
</script>
function abc()
{
if(form1.textfield1.value=="")
{
window.alert("用户名不能为空！");
form1.textfield1.focus();
}
form1.submit
}
</script>
gxh7506 2006-05-15
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修改:<form action="" method="post" id="form1" onsubmit="return abc()">
abc()函数:
function abc(){
if(form1.textfield1.value==""){
window.alert("用户名不能为空！");
form1.textfield1.focus();
return false;
}
return true;
}
abc()函数:
function abc(){
if(form1.textfield1.value==""){
window.alert("用户名不能为空！");
form1.textfield1.focus();
return false;
}
return true;
}
etilm 2006-05-15
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还是没有提示啊!
laochake 2006-05-15
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function abc(){
if(form1.textfield1.value==""){
window.alert("用户名不能为空！");
form1.textfield1.focus();
return false;
}
return true;
}
if(form1.textfield1.value==""){
window.alert("用户名不能为空！");
form1.textfield1.focus();
return false;
}
return true;
}
cqq 2006-05-15
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<form action="" method="post" onsubmit="abc()">
