一个网页的通用验空校验,为空的时候是没有问题,可是为什么不为空的时候会报错呢?
function CheckNeed(num){//通用验空模块
for(var i = 0;i <= num.length; i++){
if(document.getElementById(num[i]).value ==""){
document.getElementById(num[i]+"1").innerHTML="不能为空!";
document.getElementById(num[i]).focus();
return false;
}
}
}function cou(){//课程为空添加校验
var num = new Array("course");
if(!CheckNeed(num)){
return false;
}
}function adm(){//管理员添加校验
var num = new Array("uid","pwd");
if(!CheckNeed(num)){
return false;
}
}function log(){//登陆验证码
var num = new Array("uid","pwd");
if(!CheckNeed(num)){
return false;
}
if(document.getElementById("chk1").innerHTML!=document.getElementById("chk").value){
alert("验证码输入不正确!");
return false;
}
}
function CheckNeed(num){//通用验空模块
for(var i = 0;i <= num.length; i++){
if(document.getElementById(num[i]).value ==""){
document.getElementById(num[i]+"1").innerHTML="不能为空!";
document.getElementById(num[i]).focus();
return false;
}
}
}function cou(){//课程为空添加校验
var num = new Array("course");
if(!CheckNeed(num)){
return false;
}
}function adm(){//管理员添加校验
var num = new Array("uid","pwd");
if(!CheckNeed(num)){
return false;
}
}function log(){//登陆验证码
var num = new Array("uid","pwd");
if(!CheckNeed(num)){
return false;
}
if(document.getElementById("chk1").innerHTML!=document.getElementById("chk").value){
alert("验证码输入不正确!");
return false;
}
}
你return 了 之后的代码就不会执行了 。
function CheckNeed(num){//通用验空模块
for(var i = 0;i <= num.length; i++){
if(document.getElementById(num[i]).value ==""){
document.getElementById(num[i]+"1").innerHTML="不能为空!";
document.getElementById(num[i]).focus();
return false;
}
}
}
很明显没有返回值,就会导致if(!CheckNeed(num))无法确定是否为真!
所以你最好在下面加一句:
function CheckNeed(num){//通用验空模块
for(var i = 0;i <= num.length; i++){
if(document.getElementById(num[i]).value ==""){
document.getElementById(num[i]+"1").innerHTML="不能为空!";
document.getElementById(num[i]).focus();
return false;
}
}
return true;}
我觉得上面那个return true应该是要加才对function cou(){//课程为空添加校验
var num = new Array("course");
if(!CheckNeed(num)){
return false;
}
else{return true;}
}
这里我觉得也应该加
哎呀,上网本运行不了myeclipse,要明天去上机才可以运行
本来应该文本框不为空是可以运行通过的,可是现在不为空是报错。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>管理员管理</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="css/com.css">
<script type="text/javascript" src="js/checkneed.js"></script>
</head>
<body>
<table width="700" border="0" align="center" cellspacing="0" background="resource/02.jpg">
<tr>
<td width="148"><br></td>
<td> </td>
</tr>
<tr>
<td> </td>
<td><a href="admin/index.jsp">首页</a> | <a href="admin/admin02.jsp">管理员管理</a> | <a href="admin/admin03.jsp">校务管理</a>| <a href="admin/admin04.jsp">教师管理</a> | <a href="admin/admin05.jsp">学生管理</a></td>
</tr>
<tr>
<td> </td>
<td> </td>
</tr>
</table>
<table width="400" border="0" align="center" cellspacing="0">
<tr class="bg3">
<td colspan="3"><div align="center"><a href="admin/admin02add.jsp">管理员添加</a> | <a href="admin/admin02.jsp">管理员编辑</a> | <a href="admin/admin02del.jsp">管理删除</a></div></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
<form method="post" action="servlet/adminadd" onsubmit="return adm()">
<table width="400" border="0" cellspacing="0" align="center">
<tr>
<td colspan="3">
<%
%>
</td>
</tr>
<tr>
<td width="119"><div align="right">用户名:</div></td>
<td width="174"><input type="text" name="uid" title="用户名" maxlength="10" /> </td>
<td width="101" id="uid1"> </td>
</tr>
<tr>
<td><div align="right">密码:</div></td>
<td><input type="password" name="pwd" title="密码" maxlength="10" /> </td>
<td id="pwd1"> </td>
</tr>
<tr>
<td><div align="right">教师权限</div></td>
<td><input type="checkbox" name="teacher" value="1" /> </td>
<td> </td>
</tr>
<tr>
<td><div align="right">一般权限</div></td>
<td><input type="checkbox" name="normal" value="1" /> </td>
<td> </td>
</tr>
<tr>
<td colspan="3"><div align="center">管理员备注</div></td>
</tr>
<tr>
<td colspan="3" align="center">
<textarea cols="50" rows="10" name="text">
</textarea>
</td>
</tr>
<tr>
<td colspan="3"><div align="center">
<input type="reset" value="重置" />
<input type="submit" value="提交" />
</div></td>
</tr>
<tr>
<td colspan="3" align="center">
<%
if("ok".equals(request.getParameter("msg"))){
out.print("添加成功!");
}
if("used".equals(request.getParameter("msg"))){
out.print("用户名已使用!");
}
if("error".equals(request.getParameter("msg"))){
out.print("发生未知错误!");
}
%>
</td>
</tr>
</table>
</form>
<p> </p>
<p> </p>
</body>
</html>