角度文件上传进度百分比

Question

在我用 Angular 4 开发的应用程序中，用户可以将多部分文件上传到服务器。文件很大。我需要向用户显示文件上传过程的当前进度及其百分比，我该怎么做？

提前感谢！

Answer 1

这

适用于 Angular 9 和 10（注意 observe: 'events' ）

const headers = new HttpHeaders({
        'Content-Type': 'application/json',
        Accept: 'application/json',
        Authorization: token
      }))
const formData = new FormData();
formData.append('file_param_name', file, file.name);
this.httpClient.post(url, formData, {
    headers,
    reportProgress: true,
    observe: 'events'
}).subscribe(resp => {
    if (resp.type === HttpEventType.Response) {
        console.log('Upload complete');
    }
    if (resp.type === HttpEventType.UploadProgress) {
        const percentDone = Math.round(100 * resp.loaded / resp.total);
        console.log('Progress ' + percentDone + '%');
    } 
});

Answer 2

uploadDocument(file) {
    return this.httpClient.post(environment.uploadDocument, file, { reportProgress: true, observe: 'events' })
}

Answer 3

Gajender.service.ts

 import { Injectable } from '@angular/core';
 import {HttpClient, HttpParams, HttpRequest, HttpEvent} from '@angular/common/http';
 import {Observable} from "rxjs";
      constructor(private http: HttpClient) {
      }
       uploadFileData(url: string, file: File): Observable<HttpEvent<any>> {
        let formData = new FormData();
        let user = {
          name : 'Gajender'
        }
        formData.append('file', file);
        formData.append("user", JSON.stringify(user)); 
        let params = new HttpParams();
        const options = {
          params: params,
          reportProgress: true,
        };
        const req = new HttpRequest('POST', url, formData, options);
        return this.http.request(req);
      }

user.component.ts

constructor( private gajender: Gajender) { }
  @ViewChild('selectfile') el:ElementRef;   //in html we make variable of selectfile
  progress = { loaded : 0 , total : 0 };
uploadFile = (file) => {
    var filedata = this.el.nativeElement.files[0];
    this.gajender.uploadFileData('url',filedata)
    .subscribe(
      (data: any) => { 
        console.log(data);
        if(data.type == 1 && data.loaded && data.total){
          console.log("gaju");
          this.progress.loaded = data.loaded;
          this.progress.total = data.total;
        }
        else if(data.body){
          console.log("Data Uploaded");
          console.log(data.body);
        }
       },
      error => console.log(error) 
    )

用户组件.html

<form enctype="multipart/form-data"  method="post">
  <input type='file' [(ngModel)]="file" name="file" #selectfile >
  <button type="button" (click)="uploadFile(file)">Upload</button>
</form>
Progress
<progress [value]=progress.loaded  [max]=progress.total>
</progress>

Answer 4

您可以通过以下方式轻松实现此目的：

npm i angular-progress-http

导入模块后，现在可以将其添加到 app.module.ts 下方或应用程序中堆叠应用模块的任何位置。

您将导入以下内容（在 app.module.ts 中）：

import { HttpModule } from '@angular/http';
import { ProgressHttpModule } from 'angular-progress-http';

仍在您的应用程序中。

在@NgModule

@NgModule({
  imports: [
    HttpModule,
    ProgressHttpModule
  ]
})

然后在你的组件文件（whatever.component.ts）中，你想使用它。你可以放置这个：

import { ProgressHttp } from 'angular-progress-http';

然后像这样实现：

constructor(private http: ProgressHttp) {}
    onSubmit(): void {
        const _formData = new FormData();
        _formData.append('title', this.title);
        _formData.append('doc', this.doc);
        this.http.withUploadProgressListener(progress => { console.log(`Uploading ${progress.percentage}%`); })
        .withDownloadProgressListener(progress => { console.log(`Downloading ${progress.percentage}%`); })
        .post('youruploadurl', _formData)
        .subscribe((response) => {
            console.log(response);
        });
    }

Answer 5

我们可以使用的简单 --

 upload(formData) {
return this.http.post<any>(api - url, formData, {
  reportProgress: true,
  observe: 'events'
}).pipe(
  map((event: HttpEvent) => {
    if (event.type === HttpEventType.UploadProgress) {
      const percentDone = Math.round(100 * event.loaded / event.total);
      return { status: 'progress', message: percentDone };
    }
    if (event.type === HttpEventType.Response) {
      return event.body;
    }
  }),
  catchError(this.handleError)
);

}

Answer 6

使用角度加载栏库，如果不想使用角度加载栏库，可以使用进度回调eq-xhrrequest.upload.onprogress.