<%@ page language="java" import="java.util.*" contentType="text/html;charset=GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'LoginIn.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script language="javascript">
function checkLoginId(){
var loginId=document.form1.txtLoginId.value;
if(loginId.length==0){
alert("请输入用户名");
return false;
}else{
reruen true;
}
}
function checkPassword(){
var Password=document.form1.txtPassword.value;
if(Password.length==0){
alert("请输入密码");
return false;
}else{
return true;
}
}
function checkSub(){
if(checkLoginId() && checkPassword()){
return true;
}else{
return false;
}
}
</script>
</head>
<body background="file:///E|/workspace/BookNet/WebRoot/images/background.jpg">
<form name="form1" method="post" action="">
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<table>
<tr>
<td width="275px" height="206px">
</td>
<td>
<img src="file:///E|/workspace/BookNet/WebRoot/images/DSCN0972.JPG">
</td>
<td>
用户名:<input type="text" name="txtLoginId"><br>
<br><br>
密 码: <input type="text" name="txtPassword"><br>
<br><br>
<input type="submit" name="subLogin" value="登录" onClick="return checkSub()">
<input type="button" name="btnRegister" value="注册">
</td>
</tr>
</table></form>
</body>
</html>
我加了javascript想验证非空输入,就是提交是如果“用户名”和“密码”没有写的话会谈出警告
但是为什么我现在就算不填,也不会谈出来警告也能提交
谢谢!
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'LoginIn.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script language="javascript">
function checkLoginId(){
var loginId=document.form1.txtLoginId.value;
if(loginId.length==0){
alert("请输入用户名");
return false;
}else{
reruen true;
}
}
function checkPassword(){
var Password=document.form1.txtPassword.value;
if(Password.length==0){
alert("请输入密码");
return false;
}else{
return true;
}
}
function checkSub(){
if(checkLoginId() && checkPassword()){
return true;
}else{
return false;
}
}
</script>
</head>
<body background="file:///E|/workspace/BookNet/WebRoot/images/background.jpg">
<form name="form1" method="post" action="">
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<table>
<tr>
<td width="275px" height="206px">
</td>
<td>
<img src="file:///E|/workspace/BookNet/WebRoot/images/DSCN0972.JPG">
</td>
<td>
用户名:<input type="text" name="txtLoginId"><br>
<br><br>
密 码: <input type="text" name="txtPassword"><br>
<br><br>
<input type="submit" name="subLogin" value="登录" onClick="return checkSub()">
<input type="button" name="btnRegister" value="注册">
</td>
</tr>
</table></form>
</body>
</html>
我加了javascript想验证非空输入,就是提交是如果“用户名”和“密码”没有写的话会谈出警告
但是为什么我现在就算不填,也不会谈出来警告也能提交
谢谢!
function checkSub(){
if(checkLoginId() && checkPassword()){
return true;
}else{
return false;
}
}
这个函数并没有做提交表单的处理,建议写验证写在一个函数里,如果你是
想用普通的单击事件提交表单的话,就应该这样写
function check(){
var username=document.form1.txtLoginId;
var password=docuemnt.form1.txtPassword;
if(username.value==''){
alert('登陆名不能为空');
username.focus();
return
}
<input type="button" value="登录" onClick="check()">
if(password.value==''){
alert('密码不能为空');
password.focus();
return;
}
document.form1.submit();
}
在<body>处添加: