日期:2014-05-16  浏览次数:20454 次

js 判断是否为空
//今天晚上没事干,练练手,学学js的知识:判断input 里面的type=text 里面的内容是否为空.
//one.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!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=utf-8">
<title>Test Call Value</title>
</head>
<script type="text/javascript" language="javascript">
function checkinput(){
	var frm=document.getElementById("iform");
	var input=frm.getElementsByTagName("input");
	var textcount1=0;
	var textcount2=0;
	for(i=0;i<input.length;i++){
		{
			if(input[i].type=="text"){
				textcount1++;
				if(input[i].value==""||input[i].value=="0"){
					textcount2++;
				}
			}
		}
	}
	if(textcount1==textcount2){
		alert("请选择您要预订的房间及数量");
	}
}
function checkname(){
	var name=document.getElementsByName("name").value;
	if(name==""){
		alert("姓名为空,请您认真填写");
	}
}
checkreg=function(){
var _user=document.getElementById("iname");
var _clas=document.getElementById("iclas");
var _istuid=document.getElementById("istuid");
var _iterm=document.getElementById("iterm");
var _introduce=document.getElementById("iitroduce");
if(_user.value==""){
	alert("请输入用户名称");
	_user.focus();
	return;
}
if(_clas.value==""){
	alert("请输入班级,呵呵,朋友你错啦");
	_clas.focus();
	return;
}
if(_istuid.value==""){
	alert("学号为空,请您认真填写");
	_istuid.focus();
	return;
}
if(_iterm.value==""){
	alert("您的学期为空,请您认真填写");
	_iterm.focus();
	return;
}
if(_introduce.value==""){
	alert("您的介绍为空,请认真填写,呵呵。朋友你错啦");
	_introduce.focus();
	return;
}
}

</script>
<body>
<form id="iform" name="tform" method="method" action="two.jsp">
姓名
<input id="iname" name="name" type="text" /><br/>
班级
<input id="iclas" name="clas" type="text" /><br/>
学号
<input id="istuid" name="stuid" type="text" /><br/>
学期
<input id="iterm" name="term" type="text" /><br/>
简介
<input id="iitroduce" name="introduce" type="text" /><br/>

<input type="submit" value="提交" onclick="checkreg();" /><br/>
</form>

</body>
</html>



//two.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ page import="java.sql.*,java.util.*,java.text.*" %>
<!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=utf-8">
<title>处理数据</title>
</head>
<body>
<%
	String name=request.getParameter("name");
	String clas=request.getParameter("clas");
	String stuid=request.getParameter("stuid");
	String term=request.getParameter("term");
	String introduce=request.getParameter("introduce");
	Connection conn=null;
	PreparedStatement ps=null;
	int i=0;
	try{
		String url="jdbc:oracle:thin:@localhost:1521:orcl";
		conn=DriverManager.getConnection(url,"zhang","zhang");
		String sql="insert into call (name,class,stuid,term,introduce) values (?,?,?,?,?)";
		ps=conn.prepareStatement(sql);
		ps.setString(1,name);
		ps.setString(2,clas);
		ps.setString(3,stuid);
		ps.setString(4,term);
		ps.setString(5,introduce);
		ps.executeUpdate();
	}catch(Exception e){
		e.printStackTrace();
	}finally{
		if(ps!=null){
			ps.close();
		}
		if(conn!=null){
			conn.close();
		}
	}
	
	out.println("//以下是从数据库里面读取出来的内容");
	out.println("<br/>");
	Connection connl=null;
	PreparedStatement psl=null;
	ResultSet rs=null;
	try{
		String url="jdbc:oracle:thin:@localhost:1521:orcl";
		conn=DriverManager.getConnection(url,"zhang","zhang");
		String sql="select * from call order by createtime desc";
		ps=conn.prepareStatement(sql);
		rs=ps.executeQuery();
		while(rs.next()){
			out.println("id:"+rs.getString("id"));
			out.println("-n