在Email系统中经常会上传多个文件到服务器,用户大多习惯一次上传所有的文件,而不是逐个上传,我们可以使用javascript动态地添加file元素到表单,然后在服务器端处理这些file
效果图如下:
页面代码MutlileFileUpload.aspx如下:
- <%@ Page Language="C#" AutoEventWireup="true" CodeFile="MutlileFileUpload.aspx.cs"
- Inherits="MutlileFileUpload" %>
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head>
- <title>多文件上传到服务器Demo</title>
- <link href="css/writemail.css" rel="stylesheet" type="text/css" />
- <script type="text/javascript">
- <!--
- var MAXFILES = 5; //文件计数器
- var fileCount = 0;
- function addAttach(noAlert) {
- if (fileCount >= MAXFILES && !noAlert) { alert("最多只能添加" + MAXFILES + "个附件!"); return; }
- var fileSectionDiv = document.getElementById("files");
- var fileItemDiv = document.createElement("div");
- fileCount++;
- var content = "<input type='file' onchange='return addAttach(true);' name='fileUpload'" + fileCount + "> <a href='#' onclick='return delAttach("" + fileCount + "")' class='delete_attach' >移除附件</a>";
- fileItemDiv.id = "fileItemDiv" + fileCount;
- fileItemDiv.innerHTML = content;
- fileSectionDiv.appendChild(fileItemDiv);
- return false;
- }
- function delAttach(fileIndex) {
- var fileSectionDiv = document.getElementById("files");
- var fileItemDiv = document.getElementById("fileItemDiv" + fileIndex);
- fileSectionDiv.removeChild(fileItemDiv);
- fileCount--;
- return false;
- } //
- --></script>
- </head>
- <body>
- <form id="form1" runat="server">
- <div>
- <a id="addAttach_a" onclick="return addAttach(false);" href="#" class="add_attach">添加附件</a>
- <div id="files">
- </div>
- <asp:Button ID="btnSend" runat="server" Text="发送" OnClick="btnSend_Click" />
- </div>
- </form>
- </body>
- </html>
样式表WriteMail.css代码如下:
- .delete_attach {PADDING-LEFT: 18px; BACKGROUND: url(../images/deleteattch_icon.gif) no-repeat left top; MARGIN-LEFT: 7px; WIDTH: 90px; COLOR: #002f76}.add_attach {PADDING-LEFT: 22px; BACKGROUND: url(../images/attach.gif) no-repeat left center; WIDTH: 90px; COLOR: #002f76}
后台代码MutlileFileUpload.aspx.cs如下:
- using System;
- using System.IO;
- using System.Web.UI;
- public partial class MutlileFileUpload : System.Web.UI.Page
- {
- protected void Page_Load(object sender, System.EventArgs e)
- { //告诉表单如何格式化文件信息
- Page.Form.Enctype = "multipart/form-data";
- }
- protected void btnSend_Click(object sender, EventArgs e)
- {
- for (int index = 0; index < Request.Files.Count; index++)
- {
- if (!string.IsNullOrEmpty(Request.Files[index].FileName))
- {
- Request.Files[index].SaveAs(Path.Combine(Server.MapPath("Files"), System.IO.Path.GetFileName(Request.Files[index].FileName)));
- }
- }
- }
- }