jquery implements the function of dragging file upload and loading progress bar-JS Tutorial-php.cn

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

亚连

Release： 2018-05-29 15:36:26

Original

1542 people have browsed it

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
<p class="parent-dlg" >
 <p class="progress-label">0%</p>
 <p class="son"></p>
</p>
//要拖动到的地方
<p class="main_content_center"></p>

Copy after login

js:

var dz = $(&#39;#main_content_center&#39;);
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:&#39;&#39;,
 type:&#39;post&#39;,
 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();
 }
 }

Copy after login

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;}

Copy after login

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

Solution to the flashing problem of vue page loading

A brief discussion on the problem of js obtaining the ModelAndView value

The problem and solution of {{}} flickering when vue renders

The above is the detailed content of jquery implements the function of dragging file upload and loading progress bar. For more information, please follow other related articles on the PHP Chinese website!