Real-time display of progress bar for uploading images based on Jquery plug-in Uploadify_jquery

first learn about uploadify, the details are as follows

uploadify is a simple and easy-to-use multi-file upload solution. as a jquery plug-in, uploadify is simple to use and highly customizable.

uploadify features:

to put it simply, uploadify is a file upload plug-in based on jquery. its functional features are summarized as follows:

1), supports single file or multiple file uploads, and can control the number of files uploaded concurrently
2) support various languages ​​for use on the server side, such as php, .net, java...
3). upload file type and size limit can be configured through parameters
4) whether to automatically upload files after selecting them can be configured through parameters
5), easy to expand, can control the callback function of each step (onselect, oncancel...)
6). control appearance through interface parameters and css
7) provide event callbacks for upload progress and display upload progress in real time
8) before starting, you need to download the plug-in installation package locally and reference it. please see the code comments for detailed implementation. start the code below.

1. html code

<div id="webapplogo_file" style="display: block; width: 800px; background-color: #fff;">
      <ul>
        <li style="margin-left: 213px;"><span class="black_blod14">logo图标：</span></li>
        <li style="margin-left: 3px;">
          <input type="text" readonly="readonly" id="text_webapplogo" name="app_logo" class="appipt1" value="<%=applogo %>" /></li>
        <li style="padding-top: 1px;">
          <input type="file" id="webapplogo" name="webapplogo" />
        </li>
        <li><span style="display: none; margin-left: 5px; padding-left: 20px; color: #ea5200;
          font-size: 12px; background: url('images/icon_03.gif' ) no-repeat 0px 0px;" id="textporapplogo">
          请上传logo图标！</span></li>
        <li style="margin-left: 220px;"><span class="grey999" style="margin-left: 90px; float: left;">
          尺寸72px*72px，png格式,建议使用 图标psd模板 制作</span>
          <div id="qid_webapplogo" class="filequeue"></div>
          <table id="webapplogo_tab" width="50%" border="0" cellspacing="0" cellpadding="0"
            align="center" class="grey999" style="display: none; margin-left: 90px; float: left;">
            <tr>
              <td align="center" valign="bottom">
                <img    style="max-width:90%" id="img_64" src="images/icon_02.gif" border="0" / alt="Real-time display of progress bar for uploading images based on Jquery plug-in Uploadify_jquery" ><br />
                (64*64)
              </td>
              <td align="center" valign="bottom">
                <img    style="max-width:90%" id="img_48" src="images/icon_02.gif" border="0" / alt="Real-time display of progress bar for uploading images based on Jquery plug-in Uploadify_jquery" ><br />
                (48*48)
              </td>
              <td align="center" valign="bottom">
                <img    style="max-width:90%" id="img_32" src="images/icon_02.gif" border="0" / alt="Real-time display of progress bar for uploading images based on Jquery plug-in Uploadify_jquery" ><br />
                (32*32)
              </td>
              <td align="center" valign="bottom">
                <img    style="max-width:90%" id="img_16" src="images/icon_02.gif" border="0" / alt="Real-time display of progress bar for uploading images based on Jquery plug-in Uploadify_jquery" ><br />
                (16*16)
              </td>
            </tr>
          </table>
        </li>
      </ul>
    </div>

2. javascript code (key part)

$("#webapplogo").uploadify({ 
      'uploader': 'js/uploadify-v2.1.4/uploadify.swf',//进度条，uploadify里面含有
      'script': 'uploadapplogo.ashx',//一般处理程序
      'cancelimg': 'js/uploadify-v2.1.4/cancel.png',//取消图片路径
      'folder': 'imagelogo',//上传文件夹名
      'auto': true, //文件添加到上传队列后，自动进行上传。默认为false
      'multi': false,//是否允许多文件上传。默认为false
      'fileext':'*.gif;*.jpg;*.jpeg;*.png',//允许上传的文件类型，使用分号(”;)”分割 例如:*.jpg;*.gif,默认为null(所有文件类型)
      'filedesc':'不超过2m的图片 (*.gif;*.jpg;*.png)',
      'sizelimit': 2048000, //允许上传的文件大小(kb) 此为2m
      'onselectonce': function(event,data) { //在单文件或多文件上传时，选择文件时触发
        //event 事件对象(the event object)
        //data 选择的操作信息
        //data.filesselected 选择文件操作中选中的文件数量
        $('#status-message').text(data.filesselected + ' 文件正在等待上传…….'); 
      },
      'oncomplete': function(event, queueid, fileobj, response, data) {//当单个文件上传完成后触发
        //event:事件对象(the event object)
        //id:该文件在文件队列中的唯一表示
        //fileobj:选中文件的对象，他包含的属性列表
        //response:服务器端返回的response文本，我这里返回的是处理过的文件名称
        //data：文件队列详细信息和文件上传的一般数据

        alert("文件:" + fileobj.name + " 上传成功！");
        //设置图片名称
        $("#applogo").attr("value",response);
        //设置输入框的值
        $("#text_webapplogo").attr("value",fileobj.name);
        //设置图片路径
        $("#img_64").attr("src","imagelogo/64_"+response);
        $("#img_48").attr("src","imagelogo/48_"+response);
        $("#img_32").attr("src","imagelogo/32_"+response);
        $("#img_16").attr("src","imagelogo/16_"+response);
        //图片路径设置完成后，显示图片
        $("#webapplogo_tab").css("display","block");
      },
      'onerror': function(event, queueid, fileobj) {//当单个文件上传出错时触发
        alert("文件:" + fileobj.name + " 上传失败！");
      },
      'buttonimg':'images/bn_04.gif',//浏览按钮的图片路径
      'width':60,//浏览按钮的宽和高
      'height':24
      ,'queueid':'qid_webapplogo'//页面上作为文件上传队列的元素的id
    });

3. server-side processing of file uploads

/// <summary>
  /// 上传文件
  /// </summary>
  public class UploadApplogo : IHttpHandler
  {
    System.Drawing.Image image, image64, image48, image32, image16; //定义image类的对象
    protected string imagePath;//图片路径
    protected string imageType;//图片类型
    protected string imageName;//图片名称
    protected string fileName;//图片名称
    //提供一个回调方法,用于确定Image对象在执行生成缩略图操作时何时提前取消执行
    //如果此方法确定 GetThumbnailImage 方法应提前停止执行，则返回 true；否则返回 false
    System.Drawing.Image.GetThumbnailImageAbort callb = null;

    public void ProcessRequest(HttpContext context)
    {
      context.Response.ContentType = "text/plain";
      HttpPostedFile UploadImage = context.Request.Files["FileData"];
      //物理路径
      string uploadpath = HttpContext.Current.Server.MapPath(context.Request["folder"] + "\\");

      if (UploadImage != null)
      {
        //是否有目录，如没有就创建
        if (!Directory.Exists(uploadpath))
        {
          Directory.CreateDirectory(uploadpath);
        }
        //客户端文件完全名称
        string filename = UploadImage.FileName;
        string extname = filename.Substring(filename.LastIndexOf(".") + 1);
        //为不重复，设置文件名
        fileName = Guid.NewGuid().ToString() + "." + extname;

        //context.Response.Write("1");
        context.Response.Write(fileName);
      }
      else
      {
        context.Response.Write("0");
      }

      string mPath;      

      imagePath = UploadImage.FileName;
      //取得图片类型
      imageType = imagePath.Substring(imagePath.LastIndexOf(".") + 1);
      //取得图片名称
      imageName = imagePath.Substring(imagePath.LastIndexOf("\\") + 1);
      Stream imgStream = UploadImage.InputStream;//流文件，准备读取上载文件的内容
      int imgLen = UploadImage.ContentLength;//上载文件大小

      //建立虚拟路径
      mPath = HttpContext.Current.Server.MapPath(context.Request["folder"]);
      //保存到虚拟路径
      UploadImage.SaveAs(mPath + "\\" + fileName);
      ////显示原图
      //imageSource.ImageUrl = "upFile/" + imageName;
      //为上传的图片建立引用
      image = System.Drawing.Image.FromFile(mPath + "\\" + fileName);

      //生成缩略图
      image64 = image.GetThumbnailImage(64, 64, callb, new System.IntPtr());
      //把缩略图保存到指定的虚拟路径
      image64.Save(HttpContext.Current.Server.MapPath(context.Request["folder"]) + "\\64_" + fileName);
      //释放image64对象的资源
      image64.Dispose();

      //生成缩略图
      image48 = image.GetThumbnailImage(48, 48, callb, new System.IntPtr());
      image48.Save(HttpContext.Current.Server.MapPath(context.Request["folder"]) + "\\48_" + fileName);
      image48.Dispose();

      //生成缩略图
      image32 = image.GetThumbnailImage(32, 32, callb, new System.IntPtr());
      image32.Save(HttpContext.Current.Server.MapPath(context.Request["folder"]) + "\\32_" + fileName);
      image32.Dispose();

      //生成缩略图
      image16 = image.GetThumbnailImage(16, 16, callb, new System.IntPtr());
      image16.Save(HttpContext.Current.Server.MapPath(context.Request["folder"]) + "\\16_" + fileName);
      image16.Dispose();

      //释放image对象占用的资源
      image.Dispose();
    }

    public bool IsReusable
    {
      get
      {
        return false;
      }
    }
  }

4. the effect is as follows

the above is the entire content of this article, i hope it will be helpful to everyone's study.