<!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=gb2312" />
<title>无标题文档</title>
</head><body>
<script language="javascript">
function validate(myform){
if(myform.username.value.lengh==0)
{ alter("用户名不能为空");
myform.username.focus();
return false;
}
if(myform.password.value.lengh==0)
{ alter("密码不能为空");
myform.username.focus();
return false;
}
}</script>
<p>请输入用户名和密码:</p>
<form id="form1" name="form1" method="post" action="/webproject2/servlet/Longin2" onsubmit="return validate(this) " >
<table width="278" border="0">
<tr>
<td width="69">用户名:</td>
<td width="199"><label>
<input name="username" type="text" id="username" size="20" maxlength="10" />
</label></td>
</tr>
<tr>
<td>密码:</td>
<td><label>
<input name="textfield2" type="text" size="20" maxlength="10" />
</label></td>
</tr>
<tr>
<td><label>
<input type="submit" name="Submit" value="提交" />
</label></td>
<td><label>
<input name="reset" type="submit" id="reset" value="重置" />
</label></td>
</tr>
</table>
</form>
<p> </p>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head><body>
<script language="javascript">
function validate(myform){
if(myform.username.value.lengh==0)
{ alter("用户名不能为空");
myform.username.focus();
return false;
}
if(myform.password.value.lengh==0)
{ alter("密码不能为空");
myform.username.focus();
return false;
}
}</script>
<p>请输入用户名和密码:</p>
<form id="form1" name="form1" method="post" action="/webproject2/servlet/Longin2" onsubmit="return validate(this) " >
<table width="278" border="0">
<tr>
<td width="69">用户名:</td>
<td width="199"><label>
<input name="username" type="text" id="username" size="20" maxlength="10" />
</label></td>
</tr>
<tr>
<td>密码:</td>
<td><label>
<input name="textfield2" type="text" size="20" maxlength="10" />
</label></td>
</tr>
<tr>
<td><label>
<input type="submit" name="Submit" value="提交" />
</label></td>
<td><label>
<input name="reset" type="submit" id="reset" value="重置" />
</label></td>
</tr>
</table>
</form>
<p> </p>
</body>
</html>
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{ alter("密码不能为空");
myform.username.focus();
return false;
} <tr>
<td>密码: </td>
<td> <label>
<input name="textfield2" type="text" size="20" maxlength="10" />
</label> </td>
</tr>
这段有点问题,你的定义是name="textfield2" ,可是获取值的时候确是myform.password.value,这个是获取不到值的,因为myform.password
都不存在,要保持两者的名称一致
{ alter("用户名不能为空");
myform.username.focus();
return false;
}
if(myform.password.value.lengh==0)
{ alter("密码不能为空");
myform.username.focus();
return false;
}
return true;//成功了应该返回true
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档 </title>
</head> <body>
<script language="javascript">
function validate(myform){
if(myform.username.value.lengh==0)
{ alter("用户名不能为空");
myform.username.focus();
return false;
}
if(myform.password.value.lengh==0)
{ alter("密码不能为空");
myform.username.focus();
return false;
}
return true; } </script>
<p>请输入用户名和密码: </p>
<form id="form1" name="form1" method="post" action="/webproject2/servlet/Longin2" onsubmit="return validate(this) " >
<table width="278" border="0">
<tr>
<td width="69">用户名: </td>
<td width="199"> <label>
<input name="username" type="text" id="username" size="20" maxlength="10" />
</label> </td>
</tr>
<tr>
<td>密码: </td>
<td> <label>
<input name="textfield2" type="text" size="20" maxlength="10" />
</label> </td>
</tr>
<tr>
<td> <label>
<input type="submit" name="Submit" value="提交" onclick="return validate();" />
</label> </td>
<td> <label>
<input name="reset" type="submit" id="reset" value="重置" />
</label> </td>
</tr>
</table>
</form>
<p> </p>
</body>
</html>
红色部分为必须添加部分
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head><body>
<script language="javascript">
function validate(myform){
if(myform.username.value.lengh==0)
{ alter("用户名不能为空");
myform.username.focus();
return false;
}
if(myform.password.value.lengh==0)
{ alter("密码不能为空");
myform.password.focus();
return false;
}
return true
}</script>
<p>请输入用户名和密码:</p>
<form id="form1" name="form1" method="post" action="/webproject2/servlet/Longin2" onsubmit="return validate(this) " >
<table width="278" border="0">
<tr>
<td width="69">用户名:</td>
<td width="199"><label>
<input name="username" type="text" id="username" size="20" maxlength="10" />
</label></td>
</tr>
<tr>
<td>密码:</td>
<td><label>
<input name="password" type="text" size="20" maxlength="10" />
</label></td>
</tr>
<tr>
<td><label>
<input type="submit" name="Submit" value="提交" onclick="return validate()" />
</label></td>
<td><label>
<input name="reset" type="submit" id="reset" value="重置" />
</label></td>
</tr>
</table>
</form>
<p> </p>
</body>
</html>