如何使用angularjs2上传文件(多部分) [英] How to upload files(multipart) using angularjs2

问题描述

angular2是否支持多部分表单提交，有可用的示例吗?

Do angular2 supports multipart form submit, any example available?

对此文档的任何链接都非常感谢

Any link to docs specific to this is much appreciated

请参阅来自尖角github的帖子 https://github.com/angular/angular/issues/6030

See post from angular github https://github.com/angular/angular/issues/6030

任何示例都展示了将FormData作为http的一部分发送，

Any example showcasing sending FormData as part of http,

以下是草稿代码，对我来说很好，但是想知道http

Below is a draft code which works fine for me but like to know if same supported in http

  <input id="single_f_fileup" [(ngModel)]="model.image" type="file" (change)="selectFile($event)" name="single_fileup" />

ANGULAR2

selectFile($event): void {
 var files = $event.target.files || $event.srcElement.files;
        var file = files[0];
        let formData = new FormData();
        formData.append("single_fileup", file);
        formData.append('key1', 'value1');
        formData.append('key2', 'value2');
       var req = new XMLHttpRequest();
       req.open("POST", "/api/fileupload");
       req.send(formData);
}

NODEJS 6.2

var multer  = require('multer');
var storage = multer.memoryStorage();
var upload = multer({ storage: storage });
  router.post('/api/fileupload', upload.single('single_fileup'), function(req, res, next){
        console.log(req.body,req.file);
});

如何使以下代码起作用?

 this.http.post('/api/fileupload', formData)
            .map(this.extractData)
            .catch(this.handleError);

推荐答案

示例代码片段传递包含图像的formData

Sample snippet to pass formData which contains image

https://gist.github.com/arciisine/ee57727e56cbc5e83739b2c24fd69658

https://github.com/angular/angular/issues/6030

import { Component, Input, AfterViewInit } from '@angular/core';
import { NgModel, DefaultValueAccessor, NgControl } from '@angular/forms';
import { Http, Headers, RequestOptions } from '@angular/http';

@Component({
  selector: 'app-file-uploader',
  template: '<input type="file" (change)="updated($event);">',
  providers: [NgModel, DefaultValueAccessor]
})
export class FileUploaderComponent implements AfterViewInit {

  static ROOT = '/rest/asset';

  @Input() private companyId: string = '';
  private value: string;
  private changeListener: Function;

  constructor(private http: Http, private input: NgControl) {
    this.input.valueAccessor = this;
  }

  ngAfterViewInit() {
  }

  writeValue(obj: any): void {
    this.value = obj;
  }

  registerOnChange(fn: any): void {
    this.changeListener = fn;
  }

  registerOnTouched(fn: any): void {

  }

  updated($event) {
    const files = $event.target.files || $event.srcElement.files;
    const file = files[0];
    const formData = new FormData();
    formData.append('file', file);

    const headers = new Headers({});
    let options = new RequestOptions({ headers });
    let url = FileUploaderComponent.ROOT + (this.companyId ? '/' + this.companyId : '');

    this.http.post(url, formData, options).subscribe(res => {
      let body = res.json();
      this.value = body.filename;

      if (this.changeListener) {
        this.changeListener(this.value);
      }
    });
  }
}

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