文件上传带进度条（多种风格）

文件上传带进度条多种风格非常漂亮！

曾祥展

友好的提示以及上传验证！

曾祥展

部分代码：

<form id="form1" runat="server">
   <asp:ScriptManager ID="scriptManager" runat="server" EnablePageMethods="true" />
   
   <script type="text/javascript">
       var intervalID = 0;
       var progressBar;
       var fileUpload;
       var form;       
       // 进度条      
       function pageLoad(){           
           $addHandler($get('upload'), 'click', onUploadClick);
           progressBar = $find('progress');
       }
       // 注册表单       
       function register(form, fileUpload){            
           this.form = form;
           this.fileUpload = fileUpload;
       }        
       //上传验证
       function onUploadClick() {        
           var vaild = fileUpload.value.length > 0;
           if(vaild){              
               $get('upload').disabled = 'disabled';             
               updateMessage('info', '初始化上传...');                
               //提交上传
               form.submit();                
               // 隐藏frame
               Sys.UI.DomElement.addCssClass($get('uploadFrame'), 'hidden');
               // 0开始显示进度条
               progressBar.set_percentage(0);
               progressBar.show();           
               // 上传过程
               intervalID = window.setInterval(function(){
                   PageMethods.GetUploadStatus(function(result){
                       if(result){
                           //  更新进度条为新值
                           progressBar.set_percentage(result.percentComplete);
                           //更新信息
                           updateMessage('info', result.message);
                           
                           if(result == 100){
                               // 自动消失
                               window.clearInterval(intervalID);                        
                           }
                       }
                   });
               }, 500);                
           }
           else{
               onComplete('error', '您必需选择一个文件');
           }
       }       
   
       function onComplete(type, msg){
           // 自动消失
           window.clearInterval(intervalID);
           // 显示消息
           updateMessage(type, msg);
           // 隐藏进度条
           progressBar.hide();
           progressBar.set_percentage(0);
           // 重新启用按钮
           $get('upload').disabled = '';
           //  显示frame
           Sys.UI.DomElement.removeCssClass($get('uploadFrame'), 'hidden');
       }        
       function updateMessage(type, value){
           var status = $get('status');
           status.innerHTML = value;
           // 移除样式
           status.className = '';
           Sys.UI.DomElement.addCssClass(status, type);
       }
   
   </script>
   
   <div>
       <div class="upload">
           <h3>文件上传</h3>
           <div>
               <iframe id="uploadFrame" frameborder="0" scrolling="no" src="Upload.aspx"></iframe>
               <mb:ProgressControl ID="progress" runat="server" CssClass="lightblue" style="display:none" Value="0" Mode="Manual" Speed=".4" Width="100%" />
               <div>
                   <div id="status" class="info">请选择要上传的文件</div>
                   <div class="commands">
                       <input id="upload" type="button" value="上传" /> 
                   </div>
               </div>
           </div>
       </div> 
     
   </div>
   </form>

upload.aspx:

if (this.IsPostBack)
{
    UploadInfo uploadInfo = this.Session["UploadInfo"] as UploadInfo;
    if (uploadInfo == null)
    {
        // 让父页面知道无法处理上传
        const string js = "window.parent.onComplete('error', '无法上传文件。请刷新页面，然后再试一次);";
        ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", js, true);
    }
    else
    {
        //  让服务端知道我们还没有准备好..
        uploadInfo.IsReady = false;

        //  上传验证
        if (this.fileUpload.PostedFile != null && this.fileUpload.PostedFile.ContentLength > 0

            && this.fileUpload.PostedFile.ContentLength < 1048576)//  限制1M
        {
            //  设置路径
            string path = this.Server.MapPath(@"Uploads");
            string fileName = Path.GetFileName(this.fileUpload.PostedFile.FileName);

            // 上传信息
            uploadInfo.ContentLength = this.fileUpload.PostedFile.ContentLength;
            uploadInfo.FileName = fileName;
            uploadInfo.UploadedLength = 0;

           //文件存在 初始化...
            uploadInfo.IsReady = true;

           //缓存
            int bufferSize = 1;
            byte[] buffer = new byte[bufferSize];

            // 保存字节
            using (FileStream fs = new FileStream(Path.Combine(path, fileName), FileMode.Create))
            {                         
                while (uploadInfo.UploadedLength < uploadInfo.ContentLength)
                {
                   //从输入流放进缓冲区
                    int bytes = this.fileUpload.PostedFile.InputStream.Read(buffer, 0, bufferSize);
                    // 字节写入文件流
                    fs.Write(buffer, 0, bytes);
                    //  更新大小
                    uploadInfo.UploadedLength += bytes;

                    //  线程睡眠 上传就更慢 这样就可以看到进度条了
                    System.Threading.Thread.Sleep(100);
                }
            }

            // 删除.
            File.Delete(Path.Combine(path, fileName));

            //   让父页面知道已经处理上传完毕
            const string js = "window.parent.onComplete('success', '{0} 已成功上传');";
            ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", string.Format(js, fileName), true);
        }
        else
        {
            if (this.fileUpload.PostedFile.ContentLength >= 1048576)//1M
            {
                const string js = "window.parent.onComplete('error', '超出上传文件限制大小，请重新选择');";
                ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", js, true);
            }
            else
            {
                const string js = "window.parent.onComplete('error', '上传文件出错');";
                ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", js, true);
            }
        }                  
        uploadInfo.IsReady = false;
    }
}