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Home  >  Article  >  Web Front-end  >  Use Jquery to implement file upload using the FormData attribute of HTML5

Use Jquery to implement file upload using the FormData attribute of HTML5

零下一度
零下一度Original
2017-04-25 11:45:141266browse

This article introduces to you the methods and examples of using Jquery to use the FormData attribute of HTML5 to upload files. It is very practical and friends in need can refer to it.

1. Use Jquery to use the FormData attribute of HTML5 to upload files

Before HTML5, if we needed to implement functions such as file upload servers, sometimes we had to rely on FLASH. Implementation, and after the arrival of HTML5, we can easily upload files. We only need to use a FormData attribute of HTML5, combined with Jquery, it is easy to upload files, and read the upload progress of the file. The following upload case is Based on the implementation mentioned above, I will put all the JS, CSS and HTML page code below.

Note: The FormData attribute must depend on HTML5, so if you implement the functions according to the code in this article, the browser must be upgraded to the latest (supports the HTML5 FormData attribute).

2. The HTML page code is as follows 

 <!DOCTYPE html>
 
 <html lang="en" xmlns="http://www.w3.org/1999/xhtml">
   <head>
     <meta charset="utf-8" />
     <title>使用HTML的FormData属性实现文件上传</title>
     <link rel="stylesheet" href="../css/fileUpload.css" />
   </head>
   <body>
     <table id="uploadTable" style="border: 1px;"></table>
     <br/>
     <a href="javascript:void(0);" class="input-file">
       添加文件<input type="file" id="txtFile" style="width:200px;" />
     </a>
     <script type="text/javascript" src="../js/jquery-1.7.1-min.js"></script>
 
     <script type="text/javascript">
       $(function () {
         $(&#39;#uploadTable&#39;).SalesMOUNDUpload({
           saveUrl: &#39;/Test/Save&#39;,
           jqInput: $(&#39;#txtFile&#39;),
           fnRemove: removeFile,
           fnComplete: function (d) {
             window.console.log(&#39;complete &#39; + d);
           }
         });
       });
       function removeFile(d) {
         $.post(&#39;/Test/Remove&#39;, { "filename": d }, function(r) {
           
         });
       }
     </script>
   </body>
 </html>

3. The CSS code is as follows: 

 /*源文件头信息：
 <copyright file="FileUpload.js">
 Copyright(c)2014-2034 Kencery.All rights reserved.
 个人博客：http://www.cnblogs.com/hanyinglong
 创建人：韩迎龙(kencery)
 创建时间：2015-6-24
 </copyright>*/
 
 body
 {
   font-family: "微软雅黑";
   font-size: 12px;
 }
 .input-file {
   overflow: hidden;
   position: relative;
 }
 .input-file input {
   opacity: 0;
   filter: alpha(opacity=0);
   font-size: 100px;
   position: absolute;
   top: 0;
   right: 0;
 }
 #uploadTable {
   width: 500px;
   border-collapse: collapse;
   border: 1px solid Silver;
 }

4. The JS code is as follows: 

// 源文件头信息：
// <copyright file="FileUpload.js">
// Copyright(c)2014-2034 Kencery.All rights reserved.
// 创建人：韩迎龙(kencery)
// 创建时间：2015-6-24
// </copyright>
;
(function($) {
  $.fn.SalesMOUNDUpload = function(options) {
    var defaults =
    {
      saveUrl: &#39;&#39;,
      jqInput: &#39;&#39;,
      maxSize: 1024 * 1024 * 100, //100M
      fnRemove: &#39;&#39;, //移除文件 ，参数：文件名
      fnComplete: &#39;&#39; //每个文件成功 ，参数：服务器端返回内容
    };
    var opt = $.extend(defaults, options);
    function getByteToM(val) {
      if (isNaN(val)) return val;
      val = val / (1024 * 1024);
      val = Math.round(val * 100) / 100;
      return val;
    }
    return this.each(function() {
      var $this = $(this);
      $this.empty();
      if (typeof FormData == &#39;undefine&#39;) {
        alert(&#39;浏览器版本太低，不支持改上传！&#39;);
        return;
      }
      //表头
      if ($this.find(&#39;thead&#39;).length == 0) {
        var $thead = $(&#39;<thead>&#39;);
        var $th_tr = $(&#39;<tr>&#39;);
        $th_tr.append(&#39;<th>文件名</th>&#39;);
        $th_tr.append(&#39;<th>类型</th>&#39;);
        $th_tr.append(&#39;<th>大小</th>&#39;);
        $th_tr.append(&#39;<th>状态</th>&#39;);
        $th_tr.append(&#39;<th>操作</th>&#39;);
        $th_tr.appendTo($thead);
        $this.append($thead);
      }
      opt.jqInput[0].addEventListener(&#39;change&#39;, function(e) {
        var file = this.files[0];
        if (!file) {
          return;
        }
        if (file.size > opt.maxSize) {
          window.alert(&#39;文件超过最大&#39;);
          return;
        }
        var fd = new FormData();
        var $table = $this;
        fd.append("uploadFile", file);
        var xhr = new XMLHttpRequest();
        xhr.open(&#39;POST&#39;, opt.saveUrl, true);
        xhr.upload.addEventListener("progress", uploadProgress, false);
        xhr.addEventListener("load", uploadComplete, false);
        xhr.addEventListener("error", uploadFailed, false);
        xhr.addEventListener("abort", uploadCanceled, false);
        //表中内容
        var $tr = $(&#39;<tr>&#39;);
        $tr.append(&#39;<td class="upload_name">&#39; + file.name + &#39;</td>&#39;);
        $tr.append(&#39;<td class="upload_type">&#39; + file.type + &#39;</td>&#39;);
        $tr.append(&#39;<td class="upload_size">&#39; + getByteToM(file.size) + &#39;M&#39; + &#39;</td>&#39;);
        $tr.append(&#39;<td class="upload_status">&#39; + 0 + &#39;</td>&#39;);
        $tr.append(&#39;<td class="upload_action"><a href="javascript:void(0);">&#39; + &#39;取消&#39; + &#39;</a></td>&#39;);
        $tr.find(&#39;.upload_action a&#39;).unbind(&#39;click&#39;).bind(&#39;click&#39;, function() {
          xhr.abort();
        });
        $table.append($tr);
        function uploadProgress(evt) {
          if (evt.lengthComputable) {
            var percentComplete = Math.round(evt.loaded * 100 / evt.total);
            $tr.find(&#39;.upload_status&#39;).html(Math.round(percentComplete) + &#39;%&#39;);
          } else {
            $tr.find(&#39;.upload_status&#39;).html(&#39;unable to compute&#39;);
          }
        }
        function uploadComplete(evt) {
          if (evt.target.status == 200) {
            $tr.find(&#39;.upload_status&#39;).html(&#39;已完成&#39;);
            $tr.find(&#39;.upload_action a&#39;).html(&#39;删除&#39;);
            if (typeof opt.fnComplete == &#39;function&#39;) {
              opt.fnComplete(evt.target.response);
            }
            $tr.find(&#39;.upload_action&#39;).unbind(&#39;click&#39;).bind(&#39;click&#39;, removeFile);
          }
        }
        function uploadFailed() {
          $tr.find(&#39;.upload_status&#39;).html(&#39;<a href="javascript:void(0);">×</a>&#39;);
          $tr.find(&#39;.upload_status a&#39;).unbind(&#39;click&#39;).bind(&#39;click&#39;, function() {
            $tr.remove();
          });
          $tr.find(&#39;.upload_action a&#39;).html(&#39;重试&#39;);
          $tr.find(&#39;.upload_action a&#39;).unbind(&#39;click&#39;).bind(&#39;click&#39;, function() {
            xhr.send(fd);
          });
        }
        function uploadCanceled() {
          $tr.remove();
        }
        function removeFile() {
          $tr.remove();
          if (typeof opt.fnRemove == &#39;function&#39;) {
            opt.fnRemove(file.name);
          }
        }
        xhr.send(fd);
      }, false);
    });
  };
}(jQuery));

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