import { HttpClient, HttpEvent, HttpEventType, HttpRequest, HttpResponse } from '@angular/common/http';
import { Component } from '@angular/core';
import { UploadXHRArgs } from 'ng-zorro-antd/upload';
import { forkJoin } from 'rxjs';
@Component({
  selector: 'nz-demo-upload-custom-request',
  template: `
    <nz-upload nzAction="https://jsonplaceholder.typicode.com/posts/" [nzCustomRequest]="customReq">
      <button nz-button><i nz-icon nzType="upload"></i><span>Click to Upload</span></button>
    </nz-upload>
  `
})
export class NzDemoUploadCustomRequestComponent {
  constructor(private http: HttpClient) {}
  customReq = (item: UploadXHRArgs) => {
    // Create a FormData here to store files and other parameters.
    const formData = new FormData();
    // tslint:disable-next-line:no-any
    formData.append('file', item.file as any);
    formData.append('id', '1000');
    const req = new HttpRequest('POST', item.action!, formData, {
      reportProgress: true,
      withCredentials: true
    });
    // Always returns a `Subscription` object. nz-upload would automatically unsubscribe it at correct time.
    return this.http.request(req).subscribe(
      // tslint:disable-next-line no-any
      (event: HttpEvent<any>) => {
        if (event.type === HttpEventType.UploadProgress) {
          if (event.total! > 0) {
            // tslint:disable-next-line:no-any
            (event as any).percent = (event.loaded / event.total!) * 100;
          }
          item.onProgress!(event, item.file!);
        } else if (event instanceof HttpResponse) {
          item.onSuccess!(event.body, item.file!, event);
        }
      },
      err => {
        item.onError!(err, item.file!);
      }
    );
  };
  // A simple sliced upload.
  customBigReq = (item: UploadXHRArgs) => {
    const size = item.file.size;
    const chunkSize = parseInt(size / 3 + '', 10);
    const maxChunk = Math.ceil(size / chunkSize);
    const reqs = Array(maxChunk)
      .fill(0)
      .map((_: {}, index: number) => {
        const start = index * chunkSize;
        let end = start + chunkSize;
        if (size - end < 0) {
          end = size;
        }
        const formData = new FormData();
        formData.append('file', item.file.slice(start, end));
        formData.append('start', start.toString());
        formData.append('end', end.toString());
        formData.append('index', index.toString());
        const req = new HttpRequest('POST', item.action!, formData, {
          withCredentials: true
        });
        return this.http.request(req);
      });
    return forkJoin(...reqs).subscribe(
      () => {
        item.onSuccess!({}, item.file!, event);
      },
      err => {
        item.onError!(err, item.file!);
      }
    );
  };
}

API

服务端上传接口实现可以参考 jQuery-File-Upload。

nz-uploadcomponent

nzChange

开始、上传进度、完成、失败都会调用这个函数。

文件状态改变的回调，返回为：

{
  file: { /* ... */ },
  fileList: [ /* ... */ ],
  event: { /* ... */ },
}

• file 当前操作的文件对象。

{
   uid: 'uid',      // 文件唯一标识
   name: 'xx.png'   // 文件名
   status: 'done', // 状态有：uploading done error removed
   response: '{"status": "success"}', // 服务端响应内容
   linkProps: '{"download": "image"}', // 下载链接额外的 HTML 属性
}

• fileList 当前的文件列表。

• event 上传中的服务端响应内容，包含了上传进度等信息，高级浏览器支持。

nzCustomRequest

默认使用HTML5方式上传（即：使用 HttpClient），允许覆盖默认行为实现定制需求，例如直接与阿里云交互等。

nzCustomRequest 回调传递以下参数：

• onProgress: (event: { percent: number }): void
• onError: (event: Error): void
• onSuccess: (body: Object, xhr?: Object): void
• data: Object
• filename: String
• file: File
• withCredentials: Boolean
• action: String
• headers: Object