angular - 上传到 Ng2FileUploader 时将附加参数传递给 BackEnd

Question

我用 Ng2FileUploader 创建了一个上传掩码，并将它与 BackEnd 连接起来，效果很好。我现在希望用户在上传之前在选择下拉列表中选择月份，并且这些参数应该在上传时发送到后端。你能告诉我怎样才能最好地做到这一点吗？

我的代码：

HTML

  <select class="upload_slc" id="upload_slc" required title="" formControlName="uploadMonth" (change)="sendMonths($event)">
                          <!-- Options -->
                          <option value="placeholder" disabled [selected]="true">Monat</option>
                          <option value="content" *ngFor="let uploadMonths of uploadMonth" [value]="uploadMonths.count">
                            {{uploadMonths.count}}
                          </option>
                        </select>

TS

 // Select arrays
  uploadMonth = [{count: '1'},{count: '2'},{count: '3'},{count: '4'}];

this.uploader = new FileUploader({
        url: `${environment.baseUrl}/upload?title=SuSa&context=${year}&period=${month}`,
        maxFileSize: 2 * 1024 * 1024,
        allowedFileType: ['csv', 'xls', 'xlsx'],
        authToken: `Bearer ${currentUser.auth_token}`,
      });