Method to implement jquery-file-upload file upload with progress bar effect

jQuery File Upload 是一个Jquery图片上传组件，支持多文件上传、取消、删除，上传前缩略图预览、列表显示图片大小，支持上传进度条显示；支持各种动态语言开发的服务器端。本文主要介绍了jquery-file-upload 文件上传带进度条效果，代码分为html部分css部分和js部分，非常不错，具有参考借鉴价值,需要的朋友可以参考下，希望能帮助到大家。

效果图如下所示：

html 部分

<p style="line-height:34px;margin-top:20px;"> 
    <label style="float: left;font-size:14px">上传文件：</label> 
    <span class="btn btn-success fileinput-button fn-left"> 
   <i class="glyphicon glyphicon-plus"></i> 
   <span>浏览...</span> 
   <input type="file" name="file" id="file_upload"> 
  </span> 
    <p style="float: left;margin-left: 20px;font-weight: bold" id="uploadText"></p> 
    </p> 
    <p class="fn-clear"></p> 
    <p id="progress"> 
    <p class="bar" style="width: 0%;"></p> 
    </p>

css 部分

<link rel="stylesheet" href="/admin/assets/plugins/jquery-file-upload/css/jquery.fileupload-ui.css" rel="external nofollow" > 
<link rel="stylesheet" href="/admin/assets/plugins/jquery-file-upload/css/jquery.fileupload.css" rel="external nofollow" > 

/*文件上传控件*/ 
.bar { 
 background-image: -webkit-linear-gradient(top,#5cb85c 0,#449d44 100%); 
 background-image: -o-linear-gradient(top,#5cb85c 0,#449d44 100%); 
 background-image: -webkit-gradient(linear,left top,left bottom,from(#5cb85c),to(#449d44)); 
 background-image: linear-gradient(to bottom,#5cb85c 0,#449d44 100%); 
 filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=&#39;#ff5cb85c&#39;, endColorstr=&#39;#ff449d44&#39;, GradientType=0); 
 background-repeat: repeat-x; 
 height: 20px; 
 font-size: 12px; 
 line-height: 20px; 
 color: #fff; 
 text-align: center; 
 background-color: #428bca; 
 -webkit-box-shadow: inset 0 -1px 0 rgba(0,0,0,.15); 
 box-shadow: inset 0 -1px 0 rgba(0,0,0,.15); 
 -webkit-transition: width .6s ease; 
 -o-transition: width .6s ease; 
 transition: width .6s ease; 
} 
#progress { 
 background-image: -webkit-linear-gradient(top,#ebebeb 0,#f5f5f5 100%); 
 background-image: -o-linear-gradient(top,#ebebeb 0,#f5f5f5 100%); 
 background-image: -webkit-gradient(linear,left top,left bottom,from(#ebebeb),to(#f5f5f5)); 
 background-image: linear-gradient(to bottom,#ebebeb 0,#f5f5f5 100%); 
 filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=&#39;#ffebebeb&#39;, endColorstr=&#39;#fff5f5f5&#39;, GradientType=0); 
 background-repeat: repeat-x; 
 height: 20px; 
 width: 0%; 
 margin-bottom: 20px; 
 overflow: hidden; 
 background-color: #f5f5f5; 
 border-radius: 4px; 
 -webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,.1); 
 box-shadow: inset 0 1px 2px rgba(0,0,0,.1); 
 margin-top: 20px; 
} 
.glyphicon { 
 position: relative; 
 top: 1px; 
 display: inline-block; 
 font-family: &#39;Glyphicons Halflings&#39;; 
 font-style: normal; 
 font-weight: 400; 
 line-height: 1; 
 -webkit-font-smoothing: antialiased; 
 -moz-osx-font-smoothing: grayscale; 
} 
.glyphicon-plus:before { 
 content: "\2b"; 
} 
.btn-success { 
 color: #fff; 
 background-color: #5cb85c; 
 border-color: #4cae4c; 
} 
.btn { 
 display: inline-block; 
 padding: 6px 12px; 
 margin-bottom: 0; 
 font-size: 14px; 
 font-weight: 400; 
 line-height: 1.42857143; 
 text-align: center; 
 white-space: nowrap; 
 vertical-align: middle; 
 cursor: pointer; 
 -webkit-user-select: none; 
 -moz-user-select: none; 
 -ms-user-select: none; 
 user-select: none; 
 background-image: none; 
 border: 1px solid transparent; 
 border-radius: 4px; 
}

js 部分

<script src="/admin/assets/plugins/jquery-file-upload/js/vendor/jquery.ui.widget.js"></script> 
<script src="/admin/assets/plugins/jquery-file-upload/js/jquery.fileupload.js"></script> 
<script type="text/javascript" src="${pageContext.request.contextPath}/admin/assets/plugins/jquery-1.10.2.min.js"></script>

<span style="font-family:monospace;font-size:14px;"> <span id="_xhe_cursor"></span>$(&#39;#file_upload&#39;).fileupload({ 
  dataType: &#39;json&#39;, 
  url:&#39;${pageContext.request.contextPath}/excel/upload&#39;, 
  autoUpload:false, 
  add: function (e, data) { 
  $(&#39;#progress&#39;).css( 
   &#39;width&#39;,&#39;0%&#39; 
  ); 
  $(&#39;#progress .bar&#39;).css( 
   &#39;width&#39;, &#39;0%&#39; 
  ); 
  $("#uploadText").empty(); 
  var fileType = data.files[0].name.split(&#39;.&#39;).pop(); 
  // console.log(data); 
  var acceptFileTypes = /xls|xlsx$/i; 
  var size = data.files[0].size; 
  size = (size/1024).toFixed(2);//文件大小单位kb 
  var maxFileSize = 5*1024;//最大允许文件大小单位kb 
  if (!acceptFileTypes.test(fileType)) { 
   new Message({message:"不支持的文件类型，仅支持EXCEL文件"}); 
   return ; 
  } 
  if(size>maxFileSize){ 
   new Message({message:"文件大小："+size+"KB,超过最大限制："+maxFileSize+"KB"}); 
   return ; 
  } 
  data.context = $("<button class=&#39; ui-button ui-button-lwhite&#39;/>").text("上传") 
   .appendTo("#uploadText") 
   .click(function () { 
    data.context = $("<p/>").text("正在上传...").replaceAll($(this)); 
    data.submit(); 
   }); 
  }, 
  progressall: function (e, data) { 
  var progress = parseInt(data.loaded / data.total * 100, 10); 
  $(&#39;#progress&#39;).css( 
   &#39;width&#39;,&#39;100%&#39; 
  ); 
  $(&#39;#progress .bar&#39;).css( 
   &#39;width&#39;,progress + &#39;%&#39; 
  ); 
  }, 
  fail:function (e, data) { 
  new Message({message:"上传失败"}); 
  }, 
  done: function (e, data) { 
  console.log(data.files[0]); 
  var fileName = data.files[0].name; 
  var size = data.files[0].size; 
  var obj = data.result; 
  if(obj.success == true){ 
   $("#filePath").val(obj.result.fileId+"&"+obj.result.opLogId); 
   data.context.text("文件上传已完成！文件名："+fileName+" 文件大小："+size+"kb"); 
  }else{ 
   alert(obj.errorMsg); 
  } 
  } 
 });</span>

XHR响应为Json时IE的下载BUG

这里需要特别注意的是，由于jQuery File Upload都是采用XHR在传递数据，服务器端返回的通常是JSON格式的响应，但是IE会将这些JSON响应误认为是文件传输，然后直接弹出下载框询问是否需要下载。

解决这个问题的方法是必须将相应的Http Head从

Content-Type: application/json

更改为

Content-Type: text/

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