swfupload ajax无刷新上传图片实例代码

  最近自己做项目的时候需要添加一个功能,上传用户的图片,上传用户图片其实涉及到很多东西,不只是一个html标签<input id="File1" type="file" />或者asp.net封住好的FileUpload 控件,现在网站不再讲究的是功能性,更多的是用户体验性,在这里上传图片就需要用到ajax无刷新上传图片,这里面包含的东西不是一点半点。这里用到的是一个插件swfupload 实现无刷新上传图片。直接上传我的代码供大家参考。

  前台代码区:

  

复制代码 代码如下:

  <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ChangeAvatar.aspx.cs" Inherits="NovelChannel.ChangeAvatar" %>

  <!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 runat="server">

  <title></title>

  <link href="/CSS/jQueryUI/jquery-ui-1.10.2.custom.css" rel="stylesheet" type="text/css" />

  <style type="text/css">

  #draggable

  {

  width:50px;

  height:50px;

  padding:0.5em;

  }

  </style>

  <script src="/JS/jQuery/jquery-1.9.1.js" type="text/javascript"></script>

  <script src="/JS/jQuery/jquery-ui-1.10.2.custom.js" type="text/javascript"></script>

  <script type="text/javascript" src="/JS/swf/swfupload.js"></script>

  <script type="text/javascript" src="/JS/swf/handlers.js"></script>

  <script type="text/javascript">

  function uploadImgSuccess(file, response) {

  //$("#imgAvatar").attr("src", response + "?ts=" + new Date());

  //"url("+response + "?ts="+ new Date()+")")

  var strs = $.parseJSON(response);

  var imgPath = strs[0];

  var imgWidth = strs[1];

  var imgHeight = strs[2];

  $("#avatarContainer").css("background-image", "url(" + imgPath + ")");

  $("#avatarContainer").css("width", imgWidth + "px").css("height", imgHeight+"px");

  };

  $(function () {

  var swfu;

  swfu = new SWFUpload({

  // Backend Settings

  upload_url: "/Ajax/UploadAvatar.ashx",

  post_params: {

  "ASPSESSID": "<%=Session.SessionID %>"

  },

  // File Upload Settings

  file_size_limit: "2 MB",

  file_types: "*.jpg",

  file_types_description: "JPG Images",

  file_upload_limit: 0, // Zero means unlimited

  // Event Handler Settings - these functions as defined in Handlers.js

  // The handlers are not part of SWFUpload but are part of my website and control how

  // my website reacts to the SWFUpload events.

  swfupload_preload_handler: preLoad,

  swfupload_load_failed_handler: loadFailed,

  file_queue_error_handler: fileQueueError,

  file_dialog_complete_handler: fileDialogComplete,

  upload_progress_handler: uploadProgress,

  upload_error_handler: uploadError,

  upload_success_handler: uploadImgSuccess,

  upload_complete_handler: uploadComplete,

  // Button settings

  button_image_url: "/JS/swf/images/XPButtonNoText_160x22.png",

  button_placeholder_id: "btnUploadImgPlaceholder",

  button_width: 160,

  button_height: 22,

  button_text: '<span class="button">选择图片(最大2MB)</span>',

  button_text_style: '.button { font-family: Helvetica, Arial, sans-serif; font-size: 14pt; } .buttonSmall { font-size: 10pt; }',

  button_text_top_padding: 1,

  button_text_left_padding: 5,

  // Flash Settings

  flash_url: "/JS/swf/swfupload.swf", // Relative to this file

  flash9_url: "/JS/swf/swfupload_FP9.swf", // Relative to this file

  custom_settings: {

  upload_target: "divFileProgressContainer"

  },

  // Debug Settings

  debug: false

  });

  });

  $(function () {

  $("#draggable").draggable({ containment: "parent" },

  { cursor: "crosshair" });

  $("#draggable").dblclick(function () {

  var thisOffset = $(this).offset();//获取改容器的坐标位置

  var parentOffset = $(this).parent().offset(); //获取父容器的坐标位置

  var left = thisOffset.left - parentOffset.left;//得到相对于父窗体的相对位置

  var top = thisOffset.top - parentOffset.top; //得到相对于父窗体的相对位置

  alert(left+" "+top);

  });

  });

  </script>

  </head>

  <body>

  <form id="form1" runat="server">

  <div>

  <span id="btnUploadImgPlaceholder"></span>

  <div id="divFileProgressContainer"></div>

  <br />

  <div id="avatarContainer" style="width:200px;height:300px">

  <div id="draggable" style="background-color:transparent;border-width:1px;border-color:Black;border-style:solid;">

  拖过

  </div>

  </div>

  <img id="imgAvatar" style="display:none;"/>

  </div>

  </form>

  </body>

  </html>

  后台一般处理程序区:

  (UploadAvatar.ashx)

  

复制代码 代码如下:

  using System;

  using System.Collections.Generic;

  using System.Linq;

  using System.Web;

  using System.IO;

  using System.Drawing;

  using System.Web.Script.Serialization;

  using System.Drawing.Drawing2D;

  namespace NovelChannel.Ajax

  {

  /// <summary>

  /// UploadAvatar 的摘要说明

  /// </summary>

  public class UploadAvatar : IHttpHandler

  {

  public void ProcessRequest(HttpContext context)

  {

  context.Response.ContentType = "text/plain";

  //context.Response.Write("Hello World");

  HttpPostedFile uploadFile = context.Request.Files["FileData"];

  string ext = Path.GetExtension(uploadFile.FileName);

  if (ext != ".jpg")

  {

  context.Response.Write("非法的文件类型");

  return;

  }

  string fileName = DateTime.Now.ToString("yyMMddhhMMss") + new Random().Next(1000, 9999) +".jpg";

  string filePath = "/Images/UserImg/" + fileName;

  string fullPath = HttpContext.Current.Server.MapPath("~" + filePath);

  uploadFile.SaveAs(fullPath);

  System.Drawing.Image img = Bitmap.FromFile(fullPath);

  string[] strs={filePath,img.Size.Width.ToString(),img.Size.Height.ToString()};

  JavaScriptSerializer jss=new JavaScriptSerializer ();

  string json=jss.Serialize(strs);

  context.Response.Write(json);

  }

  public bool IsReusable

  {

  get

  {

  return false;

  }

  }

  }

  }

  这样就可以实现无刷新上传图片的效果了。由于项目中包含一部分jQuery-UI的拖拽效果,如果对大家的项目没有什么帮助的话请适当删除。