javascript - 如何在文件上传时显示状态消息？

Question

谁能提供一种简单的方法，使用 JavaScript 在文件上传时显示状态消息并在文件上传时消失？

Answer 1

  <style type="text/css">
     #loadingMessage {
        position: absolute;
        top: WHEREVER;
        left: WHEREEVER;
        z-Index: 100;
     }
  </style> 


   <div id="loadingMessage" style="visibility:hidden;">This page be uploading!</div>

    <form id="yourForm"> ... </form>

    <script>
       document.getElementById("yourform").onsubmit = function() {
          document.getElementById("loadingMessage").visibilty = "visible";
          return true;
       };
    </script>