Return 要从 ngx-image-cropper 上传的文件 - Angular

Question

我正在使用 ngx-image-cropper to crop my image. I need to retrieve the cropped image from ngx-image-cropper 上传。但是，我无法通过此检索文件对象。

这是我用来在用户裁剪图像时触发的代码，

imageCropped(event: ImageCroppedEvent) {
    this.croppedImage = event.base64;
    this.cropperHeight = event.height;
    this.cropperWidth = event.width;
    this.croppedEvent =event.file;//This is how i tried to get file
}

当我尝试上传文件时出现一些错误。所以最好提供一种从 ngx-image-cropper

获取文件对象的方法

Answer 1

要return将裁剪后的图像作为文件而不是 base64 字符串，添加以下内容：


import { ImageCroppedEvent, base64ToFile } from 'ngx-image-cropper';

  imageCropped(event: ImageCroppedEvent) {
    // Preview
    this.croppedImage = event.base64;

    const fileToReturn = this.base64ToFile(
      event.base64,
      this.data.imageChangedEvent.target.files[0].name,
    )

    return fileToReturn;
  }


  base64ToFile(data, filename) {

    const arr = data.split(',');
    const mime = arr[0].match(/:(.*?);/)[1];
    const bstr = atob(arr[1]);
    let n = bstr.length;
    let u8arr = new Uint8Array(n);

    while(n--){
        u8arr[n] = bstr.charCodeAt(n);
    }

    return new File([u8arr], filename, { type: mime });
  }

Answer 2

包中包含方法base64ToFile

// Import the method:

import { ImageCroppedEvent, base64ToFile } from 'ngx-image-cropper';

.....
imageCropped(event: ImageCroppedEvent) {
    this.croppedImage = event.base64;
    let File = base64ToFile(this.croppedImage);
}

来源：https://github.com/Mawi137/ngx-image-cropper/releases/tag/3.0.0

Answer 3

我解决了将原始文件发送到函数并在 image-cropper 上创建一个新文件实例的问题 crop( originalFile: File )功能：

import { ImageCroppedEvent, base64ToFile } from 'ngx-image-cropper';
...
crop(originalFile): File {
   ...
   ...
   output.base64 = this.cropToBase64(cropCanvas);
   if(originalFile){
     const file = new File([base64ToFile(output.base64)], originalFile.name, {lastModified: originalFile.lastModified, type: originalFile.type});
     return file;
   }
}

Return 要从 ngx-image-cropper 上传的文件 - Angular

Return File from ngx-image-cropper to upload - Angular

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