下面是一段代码:
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<script>
function aaa(){
document.getElementById("aa").src="http://localhost:8080/Sunweb/servlet/AuthServlet";
return false;
}
</script>
<html>
<head>
<title>My JSP 'Tijiao.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">
--> </head>
<body>
<form action="/Sunweb/servlet/Servlet" method="post" name="form1">
<table>
<tr>
<td>姓名:</td><td><input type="text" name="user" value="Sun"></td>
<td><input type="text" name="checkuser" value="<%=request.getAttribute("error1") %>"></td>
</tr>
<tr>
<td>输入密码:</td><td><input type="password" name="pwd" value="" ></td>
</tr>
<tr>
<td>确认密码:</td><td><input type="password" name="pwd1" value=""></td>
</tr>
<tr>
<td>邮箱地址:</td><td><input type="text" name="mail" value="@yahoo.com"></td>
</tr>
<tr><td>验证码图片:</td><td><img border=0 src="/Sunweb/servlet/AuthServlet" id="aa"></td>
<td><input type="button" name="submit1" value="更换图片" onclick="aaa();"></td>
</tr>
<tr><td>输入验证码:</td><td><input type="text" maxlength=4 name="code" value=""></td></tr>
<tr>
<td></td><td><input type="submit" name="submit" value="提交"></td>
</tr>
</table>
</form>
</body>
</html>
我想得到的最终效果是:当光标移到确认密码文本框时,如果输入密码文本框为空,就会出现一个对话框,说:密码不能为空,怎么通过添加onBlur事件来实现这一功能,注意:代码不能作太大改动,必须是在web开发环境下的。那位高手能给我指点迷津,谢谢了!
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<script>
function aaa(){
document.getElementById("aa").src="http://localhost:8080/Sunweb/servlet/AuthServlet";
return false;
}
</script>
<html>
<head>
<title>My JSP 'Tijiao.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">
--> </head>
<body>
<form action="/Sunweb/servlet/Servlet" method="post" name="form1">
<table>
<tr>
<td>姓名:</td><td><input type="text" name="user" value="Sun"></td>
<td><input type="text" name="checkuser" value="<%=request.getAttribute("error1") %>"></td>
</tr>
<tr>
<td>输入密码:</td><td><input type="password" name="pwd" value="" ></td>
</tr>
<tr>
<td>确认密码:</td><td><input type="password" name="pwd1" value=""></td>
</tr>
<tr>
<td>邮箱地址:</td><td><input type="text" name="mail" value="@yahoo.com"></td>
</tr>
<tr><td>验证码图片:</td><td><img border=0 src="/Sunweb/servlet/AuthServlet" id="aa"></td>
<td><input type="button" name="submit1" value="更换图片" onclick="aaa();"></td>
</tr>
<tr><td>输入验证码:</td><td><input type="text" maxlength=4 name="code" value=""></td></tr>
<tr>
<td></td><td><input type="submit" name="submit" value="提交"></td>
</tr>
</table>
</form>
</body>
</html>
我想得到的最终效果是:当光标移到确认密码文本框时,如果输入密码文本框为空,就会出现一个对话框,说:密码不能为空,怎么通过添加onBlur事件来实现这一功能,注意:代码不能作太大改动,必须是在web开发环境下的。那位高手能给我指点迷津,谢谢了!
解决方案 »
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onBlur()是移出啊<input type="text" name="mail" value="@yahoo.com" onfocus="if(this.value==''){alert('老大!你还么添东西呢。');this.focus();}" onblur="if(this.value==''){alert('老大!你还么添东西呢。');this.focus();}">
我理解的是这样的 当光标到确认确认密码的时候 如果输入密码的文本为空就提示
function isNotNull(){
var pass = document.getElementByName("pwd1");
if(pass.value==""){
alert("输入密码不能为空!");
return false;
}
return true;
}
在输入密码(pwd1)处调用onBlue= isNotNull()
第一是当鼠标离开密码框时,即onBlur事件
第二是Form提交时。
两个方面同时控制才算是友好的。当然如果只用Form提交也可以,onBlur事件不是必须的。<input type="password" name="pwd1" value="" onblur="return check(this);"> function check(obj){
if(obj.value == ""){
//进行你要的处理
return false;
}
return true;
}对于第二种情况3楼已经谈到了,你可以综合一下。当然,再在服务器端进行一下非空校验才是安全的。
if(document.form1.pwd.value =="")
{
alert("密码不能为空!");
}
}
<td>确认密码: </td> <td> <input type="password" name="pwd1" value="" onfocus ="checkPSW1();"> </td> 要想只是在光标在pwd1的时候check,应该用onfocus。而onblur是失去焦点是触发的。
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<script>
function aaa(){
document.getElementById("aa").src="http://localhost:8080/Sunweb/servlet/AuthServlet";
return false;
}function isNotNull(){
var pass = document.getElementByName("pwd1");
if(pass.value==""){
alert("输入密码不能为空!");
return false;
}
return true;
}
</script>
<html>
<head>
<title>My JSP 'Tijiao.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">
--> </head>
<body>
<form action="/Sunweb/servlet/Servlet" method="post" name="form1">
<table>
<tr>
<td>姓名: </td> <td> <input type="text" name="user" value="Sun"> </td>
<td> <input type="text" name="checkuser" value=" <%=request.getAttribute("error1") %>"> </td>
</tr>
<tr>
<td>输入密码: </td> <td> <input type="password" name="pwd" value="" > </td>
</tr>
<tr>
<td>确认密码: </td> <td> <input type="password" name="pwd1" value="" onBlur= isNotNull()> </td>
</tr>
<tr>
<td>邮箱地址: </td> <td> <input type="text" name="mail" value="@yahoo.com"> </td>
</tr>
<tr> <td>验证码图片: </td> <td> <img border=0 src="/Sunweb/servlet/AuthServlet" id="aa"> </td>
<td> <input type="button" name="submit1" value="更换图片" onclick="aaa();"> </td>
</tr>
<tr> <td>输入验证码: </td> <td> <input type="text" maxlength=4 name="code" value=""> </td> </tr>
<tr>
<td> </td> <td> <input type="submit" name="submit" value="提交"> </td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<script>
function aaa(){
document.getElementById("aa").src="http://localhost:8080/Sunweb/servlet/AuthServlet";
return false;
}function isNotNull(){
var pass = document.getElementByName("pwd1");
if(pass.value==""){
alert("输入密码不能为空!");
return false;
}
return true;
}
</script>
<html>
<head>
<title>My JSP 'Tijiao.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">
--> </head>
<body>
<form action="/Sunweb/servlet/Servlet" method="post" name="form1">
<table>
<tr>
<td>姓名: </td> <td> <input type="text" name="user" value="Sun"> </td>
<td> <input type="text" name="checkuser" value=" <%=request.getAttribute("error1") %>"> </td>
</tr>
<tr>
<td>输入密码: </td> <td> <input type="password" name="pwd" value="" > </td>
</tr>
<tr>
<td>确认密码: </td> <td> <input type="password" name="pwd1" value="" onBlur= isNotNull()> </td>
</tr>
<tr>
<td>邮箱地址: </td> <td> <input type="text" name="mail" value="@yahoo.com"> </td>
</tr>
<tr> <td>验证码图片: </td> <td> <img border=0 src="/Sunweb/servlet/AuthServlet" id="aa"> </td>
<td> <input type="button" name="submit1" value="更换图片" onclick="aaa();"> </td>
</tr>
<tr> <td>输入验证码: </td> <td> <input type="text" maxlength=4 name="code" value=""> </td> </tr>
<tr>
<td> </td> <td> <input type="submit" name="submit" value="提交"> </td>
</tr>
</table>
</form>
</body>
</html>
function isNotNull(){
var pass = document.getElementByName("pwd1");
if(pass.value==""){
alert("输入密码不能为空!");
return false;
}
return true;
} javascript中好象没有getElementByName这个用法,只有getElementsByName,但它是获得一个数组。我们都是用getElementById来获得一下指定名称的元素,尽管你的元素中只name属性。如果你还有什么疑问,不妨在网上搜一下这方面的文章。