Question

我想在Angular中上传多张图片，但我仍在上传单张图片，但是现在我最多要上传5张图片。对于单个图像，我有一个名为attached_image的参数，用于存储单个图像，但是在这里，我想在optionimage参数中上传多个图像。

这是我的 component.html

<div class="col-sm-8  col-xs-6">
  <div class="file-upload upload-button">
    <input id="custom-input" type="file" (change)="handleFiles($event)" multiple>
  </div>
  <!-- <button type='button' class='btn btn-default' data-toggle="modal" data-target="#imageupload" (click)="resetCropper()">Upload Image</button> -->
  <span class="img-selected" *ngIf="isImageselected">
    <i class="fa fa-check main-content__checkmark success" id="checkmark"></i>Image sel/span>
</div>

下面的

component.ts 代码用于上传单个图像。

handleFiles = function (fileInput: Event) {
  this.imageArr = ['image/jpeg', 'image/jpg', image / png','image / gif'];

  if (fileInput.target['files'][0]['size'] > 1024000) {
    $.growl.error({ title: 'Error', message: "File can not be larger than 1 MB" });
    return;
  }
  if (!this.imageArr.includes(fileInput.target['files'][0]['type'])) {
    $.growl.error({ title: 'Error', message: "Invalid file format." });
    return;
  }

  var file: File = fileInput.target['files'][0];

  this.extention = file.name.substr((file.name.lastIndexOf('.') + 1)).toLowerCase();
  var reader = new FileReader();
  reader.onload = this._handleReaderLoaded.bind(this);
  reader.readAsBinaryString(fileInput.target['files'][0]);
}

_handleReaderLoaded(readerEvt) {
  var binaryString = readerEvt.target.result;
  this.base64textString = btoa(binaryString);
  this.attached_image = 'data:image/jpeg;base64,' + this.base64textString;
  if (this.attached_image) {
    this.flashMsg = "Image uploaded successfully!";
  }
}

请高度赞赏您的帮助。

Answer 1

选择多个文件后，您将在fileInput.target['files']数组中拥有这些文件。您需要遍历并调用validateFile()。

var files = fileInput.target['files'];

if (files.length > 5) 
{
  // Error max 5 files
}

for (i=0; i < files.length; i++) 
{
  validateFile(files[i])
}

...

function validateFile(file) {
  if (fileInput.target['files'][0]['size'] > 1024000) {
     $.growl.error({ title: 'Error', message: "File can not be larger than 1 MB });
        return;
  }
  if (!this.imageArr.includes(fileInput.target['files'][0]['type'])) {
     $.growl.error({ title: 'Error', message: "Invalid file format." });
     return;
  }
}

如何在Angular 4中上传多张图片

1 个答案: