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php实现简单的上传进度条_PHP

WBOY
Release: 2016-05-28 13:13:28
Original
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Web上传文件的三种解决方案分享给大家:

这里我要使用的是form法。通过为表单元素设置enctype=”multipart/form-data”属性,让表单提交的数据以二进制编码的方式提交,在接收此请求的Servlet中用二进制流来获取内容,就可以取得上传文件的内容,从而实现文件的上传。

表单元素的enctype属性指定的是表单数据的编码方式,该属性有3个值:

 

在网上找到了两种方式,PHP配合apc实现和利用uploadprogress实现,这次我要使用的是uploadprogress,点击地址可以下载到php相应版本的dll。安装php_uploadprogress.dll扩展,重启apache。

进度条实现原理:

这里用到了一个iframe无刷新上传文件的方法。

上传完成后的样子如图:

<body>
  <div style="padding:20px">
   <form action="action.php" enctype="multipart/form-data" method="post" target="iframeUpload">
    <iframe name="iframeUpload" width="400" height="400" frameborder='1'></iframe>
    <input type="hidden" name="UPLOAD_IDENTIFIER" value="1" />
    <input id="file1" name="file1" type="file"/> 
    <input value="上传" type="submit" onclick="startProgress()"/> 
   </form>
  </div>
  <div style="width: 500px; height: 20px;border:1px solid red"> 
   <div style="position: relative; height: 20px; background-color: purple; width: 0%;" class="barinner"></div>
  </div>
  <div id='showNum'></div>
  <div class="prbar">
   <div class="prpos barinner"></div>
  </div>
 </body>
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上面的HTML代码中要注意下UPLOAD_IDENTIFIER,这个是用来定位查看哪个文件的上传进度的。我这里就写死为一个1,大家可以写成一个php生成的随机数。下面是JS脚本:

 var proNum=0; 
  var loop=0; 
  var progressResult = ""; 
  var interval; 
  function sendURL() { 
   $.ajax({ 
    type : 'GET', 
    url : "getprogress.php", 
    async : true, 
    cache : false, 
    dataType : 'json',
    data: "progress_key=" + $('input[name=UPLOAD_IDENTIFIER]').val(),
    success : function(e) { 
     proNum=parseInt(e); 
     if(e){ 
      $('.barinner').css('width', proNum+"%");
      $('#showNum').html(proNum+"%");
      setTimeout("getProgress()", 200); 
   
     }else{ 
      if(interval == 1){ 
       $('.barinner').css('width', "100%");
       $('#showNum').html("100%");
      } 
     }
    } 
   }); 
  } 
  function getProgress(){ 
   loop++; 
   sendURL(); 
  } 
  function startProgress(){ 
   interval = 1;
   $('.barinner').css('width', proNum+"%"); 
   $('#showNum').html(proNum+"%");
  setTimeout("getProgress()", 500); 
  }
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下面是getprogress.php文件中的内容:

 <&#63;php 
 if (function_exists("uploadprogress_get_info")) {
  $info = uploadprogress_get_info($_GET['progress_key']);
  if(!empty($info)){
   if(($info['bytes_uploaded'] < $info['bytes_total']) && !empty($info['bytes_uploaded']) && !empty($info['bytes_total'])){
    $proNum = floor(($info['bytes_uploaded']/$info['bytes_total'])*100);  
   }else{
    $proNum = 100;
   }
   echo $proNum;
  }else{
   echo 0;
  }
 }
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在上传完成后,我展示了两种进度条的CSS,第二种是用最新的CSS3写的。用到了一些CSS3的动画属性。


 .prbar {
  margin:5px;
  width:500px;
  background-color:#dddddd;
  overflow:hidden;
  
  /* 边框效果 */
  border: 1px solid #bbbbbb;
  -moz-border-radius: 15px;
  border-radius: 15px;
    
  /* 为进度条增加阴影效果 */
  -webkit-box-shadow: 0px 2px 4px #555555;
  -moz-box-shadow: 0px 2px 4px #555555;
  box-shadow: 0px 2px 4px #555555;   
 }
 /* No rounded corners for Opera, because the overflow:hidden dont work with rounded corners */
 doesnotexist:-o-prefocus, .prbar {
 border-radius:0px;
 }
 .prpos {
  width:0%;
  height:30px;
  background-color:#3399ff;
  border-right:1px solid #bbbbbb;
  /* CSS3 进度条渐变 */
  transition: width 2s ease;
  -webkit-transition: width 0s ease;
  -o-transition: width 0s ease;
  -moz-transition: width 0s ease;
  -ms-transition: width 0s ease;
  /* CSS3 Stripes */
  background-image: linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%);
  background-image: -moz-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%);
  background-image: -ms-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%);
  background-image: -o-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%);
  background-image: -webkit-gradient(linear, 100% 100%, 0 0,color-stop(.25, #99ccff), color-stop(.25, #3399ff),color-stop(.5, #3399ff),color-stop(.5, #99ccff),color-stop(.75, #99ccff),color-stop(.75, #3399ff),color-stop(1, #3399ff));
  background-image: -webkit-linear-gradient(135deg,#3399ff 25%,#99ccff 25%,#99ccff 50%, #3399ff 50%, #3399ff 75%,#99ccff 75%,#99ccff 100%);
  background-size: 40px 40px;
  /* Background stripes animation */
  animation: bganim 3s linear 2s infinite;
  -moz-animation: bganim 3s linear 2s infinite;
  -webkit-animation: bganim 3s linear 2s infinite;
  -o-animation: bganim 3s linear 2s infinite;
  -ms-animation: bganim 3s linear 2s infinite;
 }
 @keyframes bganim {
  from {background-position:0px;} to { background-position:40px;}
 }
 @-moz-keyframes bganim {
  from {background-position:0px;} to { background-position:40px;}
 }
 @-webkit-keyframes bganim {
  from {background-position:0px;} to { background-position:40px;}
 }
 @-o-keyframes bganim {
  from {background-position:0px;} to { background-position:40px;}
 }
 @-ms-keyframes bganim {
  from {background-position:0px;} to { background-position:40px;}
 }
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以上就是本文的全部内容,希望对大家的学习有所帮助。

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