多个文件上传的javascript编码
一.技巧:
每次动态增加一个文件上传输入框,都把它和删除按纽放置在一个单独的div中,并对删除按纽的onclick事件进行响应,使之删除删除按纽所在的div。
<%@ 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//DTDHTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>上传页面</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 type="text/javascript">
function addfile(){
//获取到指定id的元素对象
var files = document.getElementById("files");
//创建一个元素对象
var input = document.createElement("input");
//元素的属性
input.name="file";
input.type="file";
var delButton = document.createElement("input");
delButton.type="button";
delButton.value="删除";
delButton.onclick=function del(){
//得到他的父节点(div)的父节点(div id="files")删除自己的div
this.parentNode.parentNode.removeChild(this.parentNode);
}
//添加div,input ,delButton
var div = document.createElement("div");
div.appendChild(input);
div.appendChild(delButton);
files.appendChild(div);
}
</script>
</head>
<body>
<form action="${pageContext.request.contextPath}/servlet/UploadServlet" method="post" enctype="multipart/form-data"accept-charset="utf-8">
上传人<input type="text" name="User"><br>
上传文件<input type="file" name="file1"><br>
上传文件<input type="file" name="file2"><br>
<input type="submit"value="上传文件">
</form>
<form action="${pageContext.request.contextPath}/servlet/UploadServlet2" method="post" enctype="multipart/form-data">
上传人<input type="text" name="User"><br>
上传文件<input type="file" name="file1"><br>
上传文件<input type="file" name="file2"><br>
<input type="submit"value="上传文件">
</form>
<form action="${pageContext.request.contextPath}/servlet/UploadServlet3" method="post" enctype="multipart/form-data">
<table>
<tr>
<td>
用户名:
</td>
<td>
<input type="text"name="username" >
</td>
</tr>
<tr>
<td></td>
<td>
<input type="button"value="添加文件" onclick="addfile()">
</td>
</tr>
<tr>
<td></td>
<td>
<div id="files"></div>
</td>
</tr>
<tr>
<td></td>
<td>
<input type="submit"value="上传文件" >
</td>
</tr>
</table>
</form>
</body>
</html>