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  • input文件上传(上传单个文件/多选文件/文件夹、拖拽上传、分片上传)

    //上传单个/多个文件
    <input title="点击选择文件" id="h5Input1" multiple="" accept="*/*" type="file" name="html5uploader" style="position:absolute;opacity:0;top:0;left:0;100%;height:100%;cursor:pointer;">
    
    //上传文件夹
    <input title="点击选择文件夹" id="h5Input2" multiple="" webkitdirectory="" accept="*/*" type="file" name="html5uploader" style="position:absolute;opacity:0;top:0;left:0;100%;height:100%;cursor:pointer;">
    
      <!DOCTYPE html>
      <html>
        <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1"> 
        <title>uploadFile</title>
        <script src="http://lib04.xesimg.com/lib/jQuery/1.11.1/jquery.min.js?1514549590"></script>
        <style type="text/css">
         
          .upload-default {
             border: 1px dashed red;
          }
          .upload-default.upload_drag_hover{
             border: 1px dashed green;
          }
          input{
            appearance: textfield;
            -moz-appearance: textfield;
            -webkit-appearance: textfield;
          }
          input[type="number"]::-webkit-inner-spin-button {
            -webkit-appearance: none;
          }
          input[type="number"]::-webkit-outer-spin-button {
            -webkit-appearance: none;
          }
    
        </style>
        </head>
        <body>
          <input type="number" min="1" max="10000" step="1">
          <input title="点击选择多个文件" id="h5Input1" multiple="" accept="*/*" type="file" name="html5uploader">
          <input title="点击选择文件夹" id="h5Input2" multiple="multiple" webkitdirectory="" directory accept="*/*" type="file" name="html5uploader" >
          <input title="点击选择单个文件" id="h5Input3"  accept="*/*" type="file" name="file" webkitRelativePath>
          <div id="fileDragArea" style="float: left; 300px;height: 300px;" class="upload-default">或者将图片拖到此处</div>
        </body>
      </html>
      <script type="text/javascript">
        window.onload = function (){
          document.getElementById('h5Input2').addEventListener('change', function (ev) {
             console.log(ev)
             //预览,主要是文件转换为base64,或者blob,或者canvas
             //file -> base64
            // file为前面获得的
            console.log(document.getElementById('h5Input2').files[0])
            var file = ev.target.files[0]
            var reader = new FileReader();
            reader.onload = function(e) {
              var img = new Image;
              img.src = this.result;  // this.result 为base64
              //console.log(this.result)
              // 加到dom
            };
            reader.readAsDataURL(file);
    
            //file -> blob
    
            // file为前面获得的
            var url = window.URL.createObjectURL(file);
            var img = new Image;
            img.src = url;
            //console.log(img)
            // 加到dom
            console.log(file)
            // 上传 需要用到FormData模拟表单数据 或直接form上传
            // var formData = new FormData();
            // formData.append('resourceId', '');
            // // formData.append('file', '');
            // // formData.append('filename', file)
            // formData.append("file", file);
            // var xhr = new XMLHttpRequest();
            // //上传文件进度条
            // xhr.upload.addEventListener("progress", function(e){
            //   console.log('9999')
            //   if (e.total > 0) {
            //     console.log('----进度-----')
            //     console.log(e.loaded, e.total)
            //       e.percent = Math.round(e.loaded / e.total * 100);
            //       console.log( e.percent)
            //       console.log('----进度-----')
            //   }  
            // }, false);  
            // var url = 'http://courseware.xesv5.com/api/OnlineEdit/upload'
            // xhr.open('post', url, true);
            // xhr.onload = function () { 
            //   console.log(4566666)
            // }
            // xhr.send(formData); 
          /*********************************************尝试分片,创建多个上传的xhr对象****************************************/
          var bytesPerPiece = 1024 * 1024; // 每个文件切片大小定为1MB
          var totalPieces;
          var blob = file;
          var start = 0;
          var end;
          var index = 0;
          var filesize = blob.size;
          var filename = blob.name;
    
          //计算文件切片总数
          totalPieces = Math.ceil(filesize / bytesPerPiece);
          while(start < filesize) {
            //判断是否是最后一片文件,如果是最后一篇就说明整个文件已经上传完成
            if (index == totalPieces) {
              console.log('整个文件上传完成');
              return false;
            }
              end = start + bytesPerPiece;
              if(end > filesize) {
                  end = filesize;
              }
              var chunk = blob.slice(start,end);//切割文件    
              var sliceIndex = index;
              var formData = new FormData();
              formData.append("file", chunk, filename);
              formData.append("total", totalPieces);  //总片数
              formData.append("index", sliceIndex);   //当前是第几片
              var xhr = new XMLHttpRequest();
              //上传文件进度条
              xhr.upload.addEventListener("progress", function(e){
                if (e.total > 0) {
                  console.log('----进度-----')
                  //e.percent = Math.round(e.loaded / e.total * 100);
                  //(e.loaded当前片文件上传的上传的进度 start是前面分片已经上传完成的文件大小
                   e.percent = 100*(e.loaded+start)/file.size;
                   if(e.pecent > 100){
                    e.percent = 100;
                   }
                  console.log( e.percent)
                  console.log('----进度-----')
                }  
              }, false);  
              var url = 'http://courseware.xesv5.com/api/OnlineEdit/upload'
              xhr.open('post', url, true);
              console.log(5)
              xhr.onload = function () { 
                console.log(45)
              }
              xhr.send(formData); 
              start = end;
              index++;
          }
           
          /*********************************************尝试分片****************************************/
          })
        }
        var dragDrop = document.getElementById('fileDragArea');
    
        //拖拽上传文件
        dragDrop.addEventListener("dragover", function(e) { 
          e.stopPropagation();
          //必须阻止默认事件
          e.preventDefault();
          $(this).addClass("upload_drag_hover");
         }, false);
        dragDrop.addEventListener("dragleave", function(e) { 
          e.stopPropagation();
          e.preventDefault();
          $(this).removeClass("upload_drag_hover");
        }, false);
        dragDrop.addEventListener("drop", function(e) { 
          e.stopPropagation();
          e.preventDefault();
          //取消鼠标经过样式
          $(this).removeClass("upload_drag_hover");
          //获取文件列表对象和文件相对路径
          var files = e.target.files || e.dataTransfer.files;
          var dragDrop = document.getElementById('fileDragArea')
          var items = e.dataTransfer.items
          console.log(items.length)
          for (var i = 0; i < items.length; i++) {
              var item = items[i].webkitGetAsEntry();
              console.log(item)
              if (item) {
                //判断是否为文件夹
                if (item.isDirectory) {
                    traverseFileTree(item)
                } else {
                    //  this.$alert('只支持上传文件夹', '提示', {
                    //      confirmButtonText: '确定'
                    // })
                }
              }
          }
          
         }, false);
        function traverseFileTree (item, path) {
            path = path || ''
            if (item.isFile) {
                // Get file
                item.file((file) => {
                    let obj = {
                        file: file,
                        path: path + file.name
                    }
                })
            } else if (item.isDirectory) {
                // Get folder contents
                var dirReader = item.createReader()
                readDir (dirReader, item, path)
            }
        }
        function readDir (dirReader, item, path) {
          dirReader.readEntries((entries) => {
            console.log(entries.length)
            if (entries.length) {
              let obj = {
                  name: item.name,
                  process: 0,
                  total: entries.length
               }
              for (let i = 0; i < entries.length; i++) {
                  console.log(entries[i])
                  traverseFileTree(entries[i], path + item.name + '/')
              }
              // entries长度不为0,继续调用解析,直至长度为0。因为chrome浏览器只支持一次解析100个
              readDir(dirReader, item, path)
            }
          },function (e) {
             console.log(e)
          })
        }
          
        dragDrop.addEventListener("dragend", function(e) { 
          console.log(9999999999999999999999)
          console.log(e)
        })
      </script>
    

      

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  • 原文地址:https://www.cnblogs.com/dearxinli/p/8422140.html
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