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JS upload large file display progress bar implementation method

小云云Original: 2018-05-18 14:22:023781browse

This article mainly introduces in detail the JS native upload large file display progress bar and the key code of PHP file upload. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Modify the required size in php.ini:

upload_max_filesize = 8M
post_max_size = 10M
memory_limit = 20M

<!DOCTYPE html>
<html>
<head>
  <title>原生JS大文件显示进度条</title>
  <meta charset="UTF-8">
  <style type="text/css">
    #parent{position: relative;width: 500px;height:20px;border:1px solid #ccc;display: none;border-radius:20px}
    #child{position: absolute;width:0%;height:20px;background: #5FB878;display: none;line-height: 20px;color: #ffffff;font-size: 12px;border-radius:20px}
  </style>
  <script type="text/javascript">
    function $(id){
      return document.getElementById(id);
    }
  </script>
</head>
<body>
  <form action="" method="post">
    <p id="parent">
      <p id="child"></p>
    </p>
    <p>上传文件:<input type="file" name="file"></p>  
    <p><input type="submit" value="提交" id="submit"></p>
  </form>
  <script type="text/javascript">
    var oForm = document.getElementsByTagName(&#39;form&#39;)[0];
    var oSubmit = $(&#39;submit&#39;);
    //如果多个人同时提交这个表单的时候，由于是异步的请求，互不影响
    oSubmit.onclick = function(){
      try{
        var xhr = new XMLHttpRequest();
      }catch(e){
        var xhr = new ActiveXObject("Msxml2.XMLHTTP");
      }
      xhr.upload.onprogress = function(e){
        var ev = e || window.event;
        var percent = Math.floor((ev.loaded / ev.total)*100);    
        // console.log(percent);
        //将百分比显示到进度条
        $(&#39;parent&#39;).style.display = &#39;block&#39;;
        $(&#39;child&#39;).style.display = &#39;block&#39;;
        //将上传进度的百分比显示到child里面
        $(&#39;child&#39;).style.width = percent+&#39;%&#39;;
        $(&#39;child&#39;).style.textAlign = &#39;center&#39;;
        $(&#39;child&#39;).innerHTML = percent+&#39;%&#39;;
        //判断如果百分比到达100%时候，隐藏掉
        if(percent==100){
          $(&#39;parent&#39;).style.display = &#39;none&#39;;
          $(&#39;child&#39;).style.display = &#39;none&#39;;
        }
      }
      xhr.open(&#39;post&#39;,&#39;progress.php&#39;,true);
      var form = new FormData(oForm);
      xhr.send(form);
      xhr.onreadystatechange = function(){
        if(xhr.readyState==4 && xhr.status==200){
          eval("var obj ="+xhr.responseText);
          if(obj.status){
            alert(&#39;上传成功&#39;);
          }else{
            alert(&#39;上传失败&#39;);
          }
        }
      }
      //阻止表单提交
      return false;
    }
  </script>
</body>
</html>

<?php
  //开始上传
  //注意：文件是windows系统的文件，采用的gbk编码，php文件使用的是utf-8编码
  //我们不能直接修改文件的编码，只能临时修改一下php的编码
  $dst_file = $_FILES[&#39;file&#39;][&#39;name&#39;];
  $dst_file = iconv(&#39;utf-8&#39;, &#39;gbk&#39;, $dst_file);
  if(move_uploaded_file($_FILES[&#39;file&#39;][&#39;tmp_name&#39;],$dst_file)){
    $data[&#39;status&#39;] = 1;
  }else{
    $data[&#39;status&#39;] = 0;
  }
  echo json_encode($data);

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