基于jquery ajax的多文件上传进度条过程解析

这篇文章主要介绍了基于jquery ajax的多文件上传进度条过程解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

效果图

前端代码，基于jquery

<!DOCTYPE html>
<html>
 <head>
  <title>主页</title>
  <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
  <style type="text/css">
      *{
        padding: 0;
        margin: 0;
      }
      table{
        width: 600px;
        text-align: center;
      }
  </style>
 </head>
 <body>
 
    <input type="file" id="imgsend" name="file" value="发送图片" multiple="multiple" />
      <table border="1" cellspacing="0" cellpadding="0">
        <thead>
          <tr>
            <td>名称</td>
            <td>大小</td>
            <td>进度</td>
            <td>结果</td>
          </tr>
        </thead>
        <tbody>
          <!-- <tr>
              <td>xxx</td>
              <td>100</td>
              <td class="per">100%</td>
              <td class="result">成功</td>
           </tr>-->
        </tbody>
      </table>
 </body>
 <script type="text/javascript" src="/javascripts/jquery.js"> </script>
  
 <script type="text/javascript">
   
 ;(function($){
   $.fn.extend({
        uploadFile:function(option){
          var that = this;
          var defau = {
            type:"post",
            cache:false,
            url:"",
            data:{},
            processData:false,
            contentType:false,
            success:function(){},
            error:function(){},
            progress:function(){},
            sendBefore:function(){},
            filter:[], //可以接受的文件后缀
            upName:true //是否对文件名称转化大写比对
             
          }
          option = $.extend(true, defau, option);
           
         var  fileP = that.attr("name") || "file"; //传给后端得 file对应字段
          console.log(fileP)
          var files = that[0].files;
           
          option.sendBefore(files); //发送之前
           
          for(var i = 0,len = files.length; i < len; i++ ){
             var fs = files[i];
             var fnameArr = fs.name.split('.');
             var fNmae = fnameArr.pop();
             var str = '';
             if(option.upName){
                fNmae = fNmae.toUpperCase();
             }else{
                fNmae = fNmae.toLowerCase();
             }
             if(option.filter.length > 0 && option.filter.indexOf(fNmae) !== -1){
                option.error("文件后缀不符",i);  
                continue;
             }
             fileUpload(files[i],i);
             
          }
           
          //开始文件上传
          function fileUpload(file,index){
             var fd = new FormData();
             fd.append(fileP,file);
             
             //追加其他参数
             for(var i in option.data){
                fd.append(i,option.data[i]);
             }
             
             $.ajax({
              url: option.url,
              type: option.type,
             data: fd,
             cache: option.cache,
             processData: option.processData,
             contentType: option.contentType,
              success:function(data){
                option.success(data,index);
                 
              },
              error:function(error){
                console.log(error);
                option.error(error,index);
              },
              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
              file.loaded = loaded;
              file.total = tot;
              file.percent = per + '%';
              file.index = index;
              option.progress(file);
            }
          }
          return that;
        }
   });
   
 })($,window);
 
  //发送图片
   
  var $table = $("table tbody");
   
  $("#imgsend").on('change',function(){
    var that = this;
     
     $(that).uploadFile({
      url:"/api/file",
      data:{},
      filter:[], //后缀文件筛选
      sendBefore:function(files){
         //开始之前
         console.log(files);
         var str = '';
         for(var i = 0; i < files.length; i++){
          var item = files[i];
          str += '<tr>'+
                '<td>'+ item.name +'</td>'+
                '<td>'+ FormatSize (item.size) +'</td>'+
                '<td class="per">0</td>'+
                '<td class="result"></td>'+
              '</tr>';
         }
          
         $table.html(str);
          
      },
      success:function(data,index){
         //某个文件传完
        var $tr = $table.find('tr').eq(index);
        $tr.find('.result').html("成功");
      },
      error:function(err,index){
        //某个文件报错
        $tr.find('.result').html("失败");
      },
      progress:function(file){
        //某个文件的上传进度
         
        // file.loaded 已经上传的
        // flie.total 总量
        // file.percent 百分比
        // file.index  第多少个文件
        var $tr = $table.find('tr').eq(file.index);
        $tr.find('.per').html(file.percent);
        console.log(file.name + ":第" + file.index + '个:' + file.percent);
      }
      });
  });      
  //文件大小格式化
function FormatSize (fileSize) { 
  var arrUnit = ["B", "K", "M", "G", "T", "P"], 
    baseStep = 1024, 
    unitCount = arrUnit.length, 
    unitIndex = 0;          
  while(fileSize >= baseStep && unitIndex < unitCount - 1){ 
    unitIndex++; 
    fileSize /= baseStep; 
  } 
  fileSize = fileSize.toFixed(2); 
  return fileSize + " " + arrUnit[unitIndex]; 
} 
 </script>
</html>

后端代码，nodejs+express

const multiparty = require('multiparty');
  var fs =require("fs");
 router.post('/api/file', function(req, res, next) {
  //生成multiparty对象，并配置上传目标路径
  const form = new multiparty.Form()
  // //设置编辑
  form.encoding = 'utf-8'
  // //设置文件存储路径
  form.uploadDir = "./public/static/files/"
  // //设置单文件大小限制
  //form.maxFilesSize = 2 * 1024 * 1024
  // form.maxFields = 1000; 设置所以文件的大小总和
  // 上传完成后处理
  form.parse(req, (err, fields, files) => {
   if (err) {
    console.log("parse:",err);
    res.json({"success":"error"});
   } else {
    const inputFile = files.file[0];
    const uploadedPath = inputFile.path
    const imgtype = inputFile.originalFilename;
    const inPath = `./public/static/files/${imgtype}`; //重命名的路径
    // 判断是否存在./dist/static/files文件
    fs.stat('./public/static/files', (err, stats) => {
     if (JSON.stringify(stats) === undefined) {
      fs.mkdirSync('./public/static', 0777)
      fs.mkdirSync('./public/static/files', 0777)
     }
     storeFiles(uploadedPath, fields, inPath)
    });
   }
  });
   
  function storeFiles(uploadedPath, fields, inPath) {
   //重命名为真实文件名
   fs.rename(uploadedPath, inPath, (err) => {
    if (err) {
      console.log("rename:",err);
      res.json({"success":"error"});
    } else {
          res.json({"success":"hahha"});
    }
   });
  }
});

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持北冥有鱼。