HTML5 large file upload technology sharing-H5 Tutorial-php.cn

HTML5 large file upload technology sharing

墨辰丷

Release： 2018-05-10 17:35:35

Original

3579 people have browsed it

This article mainly introduces how to implement the technology of uploading large files in HTML5. I would like to share it with you for your reference.

The code is as follows:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
  <div>  
         <div>                                                               
            添加文件  
                   <input type="file" name="" id="fileinput">                                                                       
               </div>  
               <progress value="0" max="100" style=&#39;width:500px;margin-top:20px&#39;></progress>  
               <div style=&#39;margin-top:20px&#39;>  
                   <span id="handler_info" ></span>  
               </div>  
           </div>      
     <script src="Scripts/spark-md5.js"></script>  
     <script>  
       function get_filemd5sum(ofile) {  
           var file = ofile;  
           var tmp_md5;  
           var blobSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice,  
               // file = this.files[0],  
               chunkSize = 2 * 1024 * 1024, // Read in chunks of 2MB  
               chunks = Math.ceil(file.size / chunkSize),  
               currentChunk = 0,  
               spark = new SparkMD5.ArrayBuffer(),  
               fileReader = new FileReader();  
           fileReader.onload = function(e) {  
               // console.log(&#39;read chunk nr&#39;, currentChunk + 1, &#39;of&#39;, chunks);  
               spark.append(e.target.result); // Append array buffer  
               currentChunk++;  
               var md5_progress = Math.floor((currentChunk / chunks) * 100);  
               console.log(file.name + "  正在处理，请稍等," + "已完成" + md5_progress + "%");  
               var handler_info = document.getElementById("handler_info");  
               var progressbar = document.getElementsByClassName("progressbar")[0];  
               handler_info.innerHTML=file.name + "  正在处理，请稍等," + "已完成" + md5_progress + "%" 
               progressbar.value =md5_progress;  
               if (currentChunk < chunks) {  
                   loadNext();  
               } else {  
                   tmp_md5 = spark.end();  
                   console.log(tmp_md5)  
                   handler_info.innerHTML = file.name + "的MD5值是：" + tmp_md5;  
               }  
           };  
           fileReader.onerror = function() {  
               console.warn(&#39;oops, something went wrong.&#39;);  
           };  
           function loadNext() {  
               var start = currentChunk * chunkSize,  
                   end = ((start + chunkSize) >= file.size) ? file.size : start + chunkSize;  
               fileReader.readAsArrayBuffer(blobSlice.call(file, start, end));  
           }  
           loadNext();  
       }  
       var uploadfile  = document.getElementById(&#39;fileinput&#39;)  
       uploadfile.onchange = function(e){  
           var file = this.files[0];  
            if(!file) {  
               alert(&#39;请选择文件！&#39;);  
               return false;  
           }  
           get_filemd5sum(file)  
       }  
   </script>  
</body>
</html>

Copy after login

Related recommendations:

How to use ajax to implement large file upload function

JS and WebService large file upload code sharing

What should I do if PHP large file upload fails?

The above is the detailed content of HTML5 large file upload technology sharing. For more information, please follow other related articles on the PHP Chinese website!