Js+php implements asynchronous drag and drop uploading of files

2020-06-19 09:38:22
OfStack

Asynchronous drag and drop upload file - small instance

upload.html


<!DOCTYPE html>
<!--
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To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
  <head>
    <title>TODO supply a title</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
      #box{
        width:150px;height: 150px;border: 1px solid red;
      }
    </style>
    <script type="text/javascript" src="XMLhttpReuest.js"></script>
    <script>
      window.onload = function () {
        var box = document.getElementById('box');
        box.ondragenter = function (e) {
          e.preventDefault();
        }
        box.ondragover = function (e) {
          e.preventDefault();
        }
        box.ondragleave = function (e) {
          e.preventDefault();
        }
        box.ondrop = function (e) {
          e.preventDefault();
          var file = e.dataTransfer.files[0];
          var formData = new FormData();
          formData.append('aa', file);
 
          var xml = ajaxFunction();
          xml.open("post", './upload.php', true);
          xml.send(formData);
          xml.onreadystatechange = function () {
            if (xml.readyState == 4 && xml.status == 200) {
              var flag = xml.responseText;
              console.log(flag);
              if (flag == 1) {
//                box.innerHTML=" Uploaded successfully ";
                alert(' Uploaded successfully ');
              }
            }
          }
        }
 
 
      }
    </script>
  </head>
  <body>
    <div id="box">
       Please drag in the uploaded file 
    </div>
  </body>
</html>

upload.php



<?php

header("Content-Type:text/html;charset=UTF-8");

if(is_uploaded_file($_FILES['aa']['tmp_name'])){

    move_uploaded_file($_FILES['aa']['tmp_name'], "./".iconv("UTF-8", "GBK", $_FILES['aa']['name']));

    echo '1';

}

XMLhttpReuest.js


function ajaxFunction()
 {
 var xmlHttp;
 try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
 catch (e)
  {
 // Internet Explorer
  try
   {
   xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
   }
  catch (e)
   {
   try
     {
     xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
     }
   catch (e)
     {
     alert(" Your browser does not support it AJAX ! ");
     return false;
     }
   }
  }
  return xmlHttp;
}

This is the end of this article, I hope you enjoy it.