Solution to resume uploading of large HTML5 files at breakpoints

This article mainly shares with you the solution for resuming the breakpoint upload of large HTML5 files. It mainly shares with you the code method. I hope it can help you.

js code

!DOCTYPE html> xhr2 将图片拖拽到此

0% ajax上传 --> 上传 //拖拽上传开始 //-1.禁止浏览器打开文件行为 document.addEventListener("drop",function(e){ //拖离 e.preventDefault(); }) document.addEventListener("dragleave",function(e){ //拖后放 e.preventDefault(); }) document.addEventListener("dragenter",function(e){ //拖进 e.preventDefault(); }) document.addEventListener("dragover",function(e){ //拖来拖去 e.preventDefault(); }) //上传进度 var pro = document.getElementById('prouploadfile'); var persent = document.getElementById('persent'); function clearpro(){ pro.value=0; persent.innerHTML="0%"; } //2.拖拽 var stopbutton = document.getElementById('stop'); var resultfile="" var box = document.getElementById('drop_area'); //拖拽区域 box.addEventListener("drop",function(e){ var fileList = e.dataTransfer.files; //获取文件对象 console.log(fileList) //检测是否是拖拽文件到页面的操作 if(fileList.length == 0){ return false; } //拖拉图片到浏览器，可以实现预览功能 //规定视频格式 //in_array Array.prototype.S=String.fromCharCode(2); Array.prototype.in_array=function(e){ var r=new RegExp(this.S+e+this.S); return (r.test(this.S+this.join(this.S)+this.S)); }; var video_type=["video/mp4","video/ogg"]; //创建一个url连接,供src属性引用 var fileurl = window.URL.createObjectURL(fileList[0]); if(fileList[0].type.indexOf('image') === 0){ //如果是图片 var str=" "; document.getElementById('drop_area').innerHTML=str; }else if(video_type.in_array(fileList[0].type)){ //如果是规定格式内的视频 var str=" "; document.getElementById('drop_area').innerHTML=str; }else{ //其他格式，输出文件名 //alert("不预览"); var str="文件名字:"+fileList[0].name; document.getElementById('drop_area').innerHTML=str; } resultfile = fileList[0]; console.log(resultfile); //切片计算 filesize= resultfile.size; setsize=500*1024; filecount = filesize/setsize; //console.log(filecount) //定义进度条 pro.max=parseInt(Math.ceil(filecount)); i =getCookie(resultfile.name); i = (i!=null && i!="")?parseInt(i):0 if(Math.floor(filecount)<i){ alert("已经完成"); pro.value=i+1; persent.innerHTML="100%"; }else{ alert(i); pro.value=i; p=parseInt(i)*100/Math.ceil(filecount) persent.innerHTML=parseInt(p)+"%"; } },false); //3.ajax上传 var stop=1; function xhr2(){ if(stop==1){ return false; } if(resultfile==""){ alert("请选择文件") return false; } i=getCookie(resultfile.name); console.log(i) i = (i!=null && i!="")?parseInt(i):0 if(Math.floor(filecount)<parseInt(i)){ alert("已经完成"); return false; }else{ //alert(i) } var xhr = new XMLHttpRequest();//第一步 //新建一个FormData对象 var formData = new FormData(); //++++++++++ //追加文件数据 //改变进度条 pro.value=i+1; p=parseInt(i+1)*100/Math.ceil(filecount) persent.innerHTML=parseInt(p)+"%"; //进度条 if((filesize-i*setsize)>setsize){ blobfile= resultfile.slice(i*setsize,(i+1)*setsize); }else{ blobfile= resultfile.slice(i*setsize,filesize); formData.append('lastone', Math.floor(filecount)); } formData.append('file', blobfile); //return false; formData.append('blobname', i); //++++++++++ formData.append('filename', resultfile.name); //++++++++++ //post方式 xhr.open('POST', 'xhr2.php'); //第二步骤 //发送请求 xhr.send(formData); //第三步骤 stopbutton.innerHTML = "暂停" //ajax返回 xhr.onreadystatechange = function(){ //第四步 if ( xhr.readyState == 4 && xhr.status == 200 ) { console.log( xhr.responseText ); if(i<filecount){ xhr2(); }else{ i=0; } } }; //设置超时时间 xhr.timeout = 20000; xhr.ontimeout = function(event){ alert('请求超时，网络拥堵！低于25K/s'); } i=i+1; setCookie(resultfile.name,i,365) } //设置cookie function setCookie(c_name,value,expiredays) { var exdate=new Date() exdate.setDate(exdate.getDate()+expiredays) document.cookie=c_name+ "=" +escape(value)+ ((expiredays==null) ? "" : ";expires="+exdate.toGMTString()+";path=/") } //获取cookie function getCookie(c_name) { if (document.cookie.length>0) { c_start=document.cookie.indexOf(c_name + "=") if (c_start!=-1) { c_start=c_start + c_name.length+1 c_end=document.cookie.indexOf(";",c_start) if (c_end==-1) c_end=document.cookie.length return unescape(document.cookie.substring(c_start,c_end)) } } return "" } function stopup(){ if(stop==1){ stop = 0 xhr2(); }else{ stop = 1 stopbutton.innerHTML = "继续" } } php code

<?php //$name=$_POST['username']; $dir=$_POST['filename']; $dir="uploads/".md5($dir); file_exists($dir) or mkdir($dir,0777,true); $path=$dir."/".$_POST['blobname']; //print_r($_FILES["file"]); move_uploaded_file($_FILES["file"]["tmp_name"],$path); if(isset($_POST['lastone'])){ echo $_POST['lastone']; $count=$_POST['lastone']; $fp = fopen($_POST['filename'],"abw"); for($i=0;$i Related recommendations:

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