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asp. net example of asynchronous upload using new features of H5

  • 2021-10-24 19:20:27
  • OfStack

###index.html 


<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <script src="Script/jquery-1.10.2.min.js"></script>
  <script src="Script/index.js"></script>
  <title></title>
  <script type="text/javascript">
    $(function(){
      $("#ajaxFileUpload").click(function () {
        formDataUpload();
      });
    });
  </script>
</head>
<body>
  <input type="file" id="FileToUpload" multiple="multiple" mame="FileToUpload" />
  <input type="button" id="ajaxFileUpload" value=" Upload "/>
  <input type="text" size="10"/>
</body>
</html>


###index.js 


function formDataUpload() {
  // Here you can 1 Sequentially select multiple files 
  var fileUpload = document.getElementById("FileToUpload").files;
  if (fileUpload.length == 0) {
    alert(" Please select the file before uploading ");
    return;
  }
  //html5 New features 
  var formdata = new FormData();
  // Add uploaded data 
  for (var i = 0; i < fileUpload.length;i++){
    formdata.append('files', fileUpload[i]);
  }

  // Use javascript Native of ajax
  var xmlHttp = new XMLHttpRequest();
  xmlHttp.open("post", 'Handler.ashx?method=formDataUpload');
  xmlHttp.onreadystatechange = function () {
    if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
      alert(" Upload succeeded ");
    }
  }
  xmlHttp.send(formdata);
}

###handler.ashx 


<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {
    
  public void ProcessRequest (HttpContext context) {
    formDataUpload(context);
  }
  public static void formDataUpload(HttpContext context) {
    // Get the file submitted to the client 
    HttpFileCollection files = context.Request.Files;
    string msg = string.Empty;
    string error = string.Empty;
    int fileM = 0;
    if (files.Count > 0) {
      for (int i = 0; i < files.Count; i++) {      ;
        String path = @"D:\"+files[i].FileName;
        files[i].SaveAs(path);
        fileM += files[i].ContentLength;
      }
      msg = " Upload successful, total file size :" + fileM;
      string res = "{error :'" + error + "',msg:'" + msg + "'}";
      context.Response.Write(res);
      context.Response.End();
    }
  }
  public bool IsReusable {
    get {
      return false;
    }
  }
}
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