JavaScript实现form表单的多文件上传

<!--文件上传--> <form id="uploadForm" enctype="multipart/form-data"> <div class="row" style="margin-top: 20px;">  <div class="form-group col-md-12" id="file">      <input type="hidden" name="_csrf-application"     value="<?= $csrf ?>">   <div class="form-group field-uploadform-excelfiles" style="margin-left: 30px;">    <label class="control-label btn btn-primary"      for="uploadform-excelfiles">选择文件</label>    <input type="file" id="uploadform-excelfiles" name="UploadForm[excelFiles][]"      multiple class="attachment-upload" accept=".xlsx">    <input type="button" id="fileUpload" value="上传文件" class="btn btn-success" style="margin-left: 15px;">    <div class="help-block"></div>    <div id="fileName"></div>   </div>  </div> </div> <table role="presentation" class="table"><tbody id="files"></tbody></table> </form>

 var fileList; var allFile = []; //FormData对象初始化 var form = document.getElementById("upload-form"); var formData = new FormData(form); $("#uploadform-excelfiles").on('change', function (e) {  //获取表单数据并传入formData中  var norm = $("#norm").val();  var major = $("#major").val();  var type = $("#type").val();  formData.set("norm",norm);  formData.set("major",major);  formData.set("type",type);  var fileError = 0;  fileList = e.currentTarget.files;  $.each(fileList, function (index, item) {   var fileName = item.name;   var fileEnd = fileName.substring(fileName.indexOf("."));   //上传文件格式判断   if (fileEnd == ".xlsx") {    allFile.push(item);    $('#files').append( '<tr style="padding-top: 7px;">' +         '<td>'+fileName+'</td>' +         '<td>'+(item.size / 1024).toFixed(2)+'K</td>' +         '<td><input type="button" class="btn btn-danger delete" value="删除"></td>' +         '</tr>');    //追加文件    formData.append('UploadForm[excelFiles][]',item);   } else {    fileError++;   }  });  if (fileError > 0) {   alert("只能上传 “.xlsx” 格式的文件!");   document.getElementById("upload-form").reset();   return;  }  var fileCount = $('#files').find('tr').length;  $('#fileName').html('共上传 ' + fileCount + ' 个文件'); });

$('#files').on('click','.delete',function (e) {  var saveFile = [];  var norm = $("#norm").val();  var major = $("#major").val();  var type = $("#type").val();  var deleteName = e.target.parentNode.previousElementSibling.previousElementSibling.textContent;  var deleteIndex;  //将不删除的放入数组中  $.each(allFile,function (index, item) {   if(item.name == deleteName){     deleteIndex = index;   }else {    saveFile.push(item);   }  });  allFile.splice(deleteIndex,1);  //表单数据重置  formData.set("norm",norm);  formData.set("major",major);  formData.set("type",type);  formData.delete('UploadForm[excelFiles][]');  //将不删除的数组追加的formData中  $.each(saveFile,function (index, item) {   formData.append('UploadForm[excelFiles][]',item);  });  e.target.parentNode.parentNode.remove();  var fileCount = $('#files').find('tr').length;  $('#fileName').html('共上传 ' + fileCount + ' 个文件'); });

$("#fileUpload").on('click',function () {  var len = formData.getAll('UploadForm[excelFiles][]').length;  $("#overlay").show();  if(len > 1){    var deleteBtn = $(".delete");    //通过ajax进行上传    $.ajax({     url: '/finalize/upload',     type: 'POST',     cache: false,     data: formData,     processData: false,     contentType: false    }).done(function(res) {     if(res.code == 'ok'){      //进度条设置      var value = 0;      var timer2 = setInterval(function () {       value ++;       $("#progress").css('width', value + "%");       if (value == 120) {        clearInterval(timer2);        $("#overlay").hide();        alert("文件上传成功!");       }      }, 50);     //删除对应按钮     $("#fileUpload").css("display","none");     $.each(deleteBtn,function (index, item) {      $(item).css("display","none");     });     $('#files').append('<tr><td><td><td><a type="button" class="btn btn-success pull-right" id="fileDown" href="/finalize/get-file?id=' + res.data.id + '" rel="external nofollow" >文件下载</a></td></tr>')    }   }).fail(function(res) {    alert("文件上传失败:" + res.msg);   });  }else {   alert("请选择需要上传的文件！");  } });