jquery implements the function of dragging file upload and loading progress bar

This article mainly introduces jquery to implement the function of dragging file upload and loading progress bar. It mainly uses the ondrop event of HTML5. It is very good and has reference value. Friends who need it can refer to it

Uploading files is achieved by dragging files. The ondrop event of HTML5 is mainly used. Upload content channel FormData transmission:

//进度条

 
0%
 


//要拖动到的地方

js:

var dz = $('#main_content_center');
dz.ondragover = function(ev) {
 //阻止浏览器默认打开文件的操作
 ev.preventDefault();
}
dz.ondrop = function(ev) {
 ev.preventDefault();
 var files = ev.dataTransfer.files;
 var len = files.length,i = 0;
 while (i < len) {
  var filesName=files[i].name;
  var extStart=filesName.lastIndexOf(".");
  var ext=filesName.substring(extStart,filesName.length).toUpperCase();
  if(ext!=".JPG"&&ext!=".PNG"&&ext!=".XML"){ //判断是否是需要的问件类型
  TS.errorAlert("请选择.jpg、.png、.xml类型的文件上传！");
  return false;
  }else{
  test(files[i]);
  }
  i++;
 }
 $(".parent-dlg").show();
}
function test(a){
 var formData = new FormData();
 formData.append("name", a.name);
 formData.append("size", a.size);
 formData.append("data", a);
 $.ajax({
 url:'',
 type:'post',
 data:formData,
 cache: false,
 processData: false,
 contentType: false,
 xhr: function(){
 var xhr = $.ajaxSettings.xhr();
 if(onprogress && xhr.upload) {
  xhr.upload.addEventListener("progress" , onprogress, false);
  return xhr;
 }
 } 
 })
};
function onprogress(evt){
 var loaded = evt.loaded;  //已经上传大小情况 
 var tot = evt.total;  //附件总大小 
 var per = Math.floor(100*loaded/tot); //已经上传的百分比 
 $(".progress-label").html( per +"%" );
 $(".son").css("width" , per +"%");
 if(per>=100){
 $(".parent-dlg").hide();
 }
 }

Progress bar css:

.parent-dlg{position: absolute;width:400px; height:20px; border:1px solid #aaaaaa;border-radius:3px;top:30%;left:50%;z-index:9999;margin-left:-200px;display:none;}
.parent-dlg .progress-label{position: absolute;left: 50%;top: 4px;font-weight: bold;text-shadow: 1px 1px 0 #fff;} 
.parent-dlg .son {width:0; height:100%; background-color:#cccccc; text-align:center; line-height:20px; font-size:16px; font-weight:bold;}

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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