c# - 使用 ASP.net 和 jquery 进行拖放

Question

我尝试为头像图像创建拖放功能。我想要有人拖进盒子里的文件；上传到目录:'/images/profile/$username'。

这是我的代码:

<div class='fileDrop'>
    <span id='fileDropTarget'>Drag your files here</span>
</div>

<script>
    function fileSetUploadPercent(percent) {
        var uploadString = "Uploaded " + percent + " %";
        $('#fileDropTarget').text(uploadString);
    }

    function fileUploadStarted(index, file, files_count) {
        fileSetUploadPercent(0); //set the upload status to be 0
    }

    function fileUploadUpdate(index, file, currentProgress) {
        var string = "index = " + index + " Uploading file " + file.fileName + " size is " + file.fileSize + " Progress = " + currentProgress;
        $('#status').text(string);
        fileSetUploadPercent(currentProgress);
    }

    function fileUploadFinished(index, file, json, timeDiff) {
        fileSetUploadPercent(100);
        $('#fileDropTarget').css('border', '2px dotted #000000').text("Upload Voltooid");
    }

    function fileDragLeave(event) {
        $('#fileDropTarget').css('border', '2px dotted #000000').text("Sleep uw foto hierin");
    }

    function fileDragOver(event) {
        $('#fileDropTarget').css('border', '2px dashed #000000').text("Sleep uw foto hierin");
    }

    $(".fileDrop").filedrop({

        fallback_id: 'fallbackFileDrop',
        url: '/controls/upload.ascx',

        allowedfiletypes: ['image/jpeg', 'image/png', 'image/gif'],   // filetypes allowed by Content-Type.  Empty array means no restrictions
        allowedfileextensions: ['.jpg', '.jpeg', '.png', '.gif'], // file extensions allowed. Empty array means no restrictions
        //    refresh: 1000,
        paramname: 'fileUpload',        // POST parameter name used on serverside to reference file, can also be a function taking the filename and returning the paramname
        maxfiles: 1,                    // Ignored if queuefiles is set > 0
        maxfilesize: 10,                // MB file size limit
        //    queuefiles: 0,            // Max files before queueing (for large volume uploads)
        //    queuewait: 200,           // Queue wait time if full
        //    data: {},
        //    headers: {},
        //    drop: empty,
        //    dragEnter: empty,
        dragOver: fileDragOver,
        dragLeave: fileDragLeave,
        //  docEnter: empty,
        //  docOver: fileDocOver,
        //  docLeave: fileDocLeave,
        //  beforeEach: empty,
        //  afterAll: empty,
        //  rename: empty,

        error: function (err, file) {
            switch (err) {
                case 'BrowserNotSupported':
                    $('#fileDropTarget').css('border', '2px dashed #FF0000').text('Uw browser wordt niet gesupport');
                    break;
                case 'TooManyFiles':
                    $('#fileDropTarget').css('border', '2px dashed #FF0000').text('U kunt maar 1 foto tegelijk uploaden');
                    break;
                case 'FileTooLarge':
                    $('#fileDropTarget').css('border', '2px dashed #FF0000').text('Uw foto is groter dan 10MB');
                    break;
                case 'FileTypeNotAllowed':
                    $('#fileDropTarget').css('border', '2px dashed #FF0000').text('Alleen fotos zijn toegestaan');
                    break;
                case 'FileExtensionNotAllowed':
                    $('#fileDropTarget').css('border', '2px dashed #FF0000').text('Alleen fotos zijn toegestaan');
                    break;
                default:
                    $('#fileDropTarget').css('border', '2px dashed #FF0000').text(err);
                    break;
            }
        },
        uploadStarted: fileUploadStarted,
        uploadFinished: fileUploadFinished,
        progressUpdated: fileUploadUpdate
    });

</script>

但是每次我尝试上传文件时；我收到错误:“未找到”。另一个问题是我想用asp.net控件和POST请求上传这些文件。我不知道如何将文件添加到 FileUploadControl；我不知道如何从上传控件的拖场中获取文件。

    protected void Page_Load(object sender, EventArgs e)
    {
        string filetype = Request.QueryString["fileType"];
        string filename = Request.QueryString["fileUpload"];
        FileUpload FileUploadControl = new FileUpload();
        string location = "~/upload";
        try
        {
            if (filetype == "avatar") location = "images/profile/";
            FileUploadControl.SaveAs(Server.MapPath("~/") + location + filename);
            LabelStatus.Text = "Upload status: File uploaded!";
        }
        catch (Exception ex)
        {
            LabelStatus.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }

提前谢谢您。

Answer 1

试试这个。

HTML

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

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <style>
   body { padding:10px; font:14px/18px Calibri }
   .bold { font-weight:bold }
   td { padding:5px; border:1px solid #999 }
   p, output { margin:10px 0 0 0 }
   #drop_zone 
   { 
       margin:10px 0;
       width:40%; 
       min-height:150px; 
       text-align:center;
       text-transform:uppercase;
       font-weight:bold;
       border:8px dashed #898;
                height: 160px;
            }
  </style>
    <title></title>
    <script>
        var files;
        function handleDragOver(event) {
            event.stopPropagation();
            event.preventDefault();
            var dropZone = document.getElementById('drop_zone');
            dropZone.innerHTML = "Drop now";
        }

        function handleDnDFileSelect(event) {
            event.stopPropagation();
            event.preventDefault();

            /* Read the list of all the selected files. */
             files = event.dataTransfer.files;

            /* Consolidate the output element. */
             var form = document.getElementById('form1');
             var data = new FormData(form);

             for (var i = 0; i < files.length; i++) {
                 data.append(files[i].name, files[i]);
             }
             var xhr = new XMLHttpRequest();
             xhr.onreadystatechange = function () {
                 if (xhr.readyState == 4 && xhr.status == 200 && xhr.responseText) {
                     alert("upload done!");
                 } else {
                     //alert("upload failed!");
                 }
             };
             xhr.open('POST', "Upload.aspx");
            // xhr.setRequestHeader("Content-type", "multipart/form-data");
             xhr.send(data);

        }
  </script>
</head>
<body>
<form id="form1" runat="server" enctype="multipart/form-data">

        <br />
        <div id="drop_zone">Drop files here</div>
</form>
</body>
    <script>
        if (window.File && window.FileList && window.FileReader) {
            /************************************ 
             * All the File APIs are supported. * 
             * Entire code goes here.           *
             ************************************/


            /* Setup the Drag-n-Drop listeners. */
            var dropZone = document.getElementById('drop_zone');
            dropZone.addEventListener('dragover', handleDragOver, false);
            dropZone.addEventListener('drop', handleDnDFileSelect, false);

        }
        else {
            alert('Sorry! this browser does not support HTML5 File APIs.');
        }
  </script>
</html>

Server-side (Upload.aspx.cs)

using System;
using System.IO;
using System.Web;

namespace upload
{
    public partial class Upload : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
         if (IsPostBack)
         {
             UploadFile(sender,e);
         }
        }
        protected void UploadFile(object sender, EventArgs e)
        {
            HttpFileCollection fileCollection = Request.Files;
            for (int i = 0; i < fileCollection.Count; i++)
            {
                HttpPostedFile upload = fileCollection[i];
                string filename ="c:\\Test\\" +  Path.GetRandomFileName();
                upload.SaveAs(filename);
            }
        }
    }

}