从URL下载Angular 4文件 [英] Angular 4 download file from URL

问题描述

我正在使用Firebase，将图像存储在我的Firebase存储中，然后在视图上显示这些图像，每个图像都有一个按钮，即当用户按下按钮下载图像时，我该怎么做?，到目前为止，我还无法找到使用角度的方法，我在图像对象上存储了 downloadUrl ，该存储库是我上载图像并希望使用该URL时消防存储提供的 downloadUrl 下载图片

I´m working with firebase, im storing images on my firebase storage and then displaying those images on the view, each image has a button that the idea is when the user press the button download the image, how can i do it, so far i haven´t been able to find i way to do this using angular, on the image object i store the downloadUrl that fire storage give when i upload the image and i want to use that URL to download the image

组件

    <div class="wrapper-gallery" id="photos_container">
      <div class="mix col-xs-12 col-sm-4 col-md-3 item-photo" *ngFor="let photo of couplePhotos | async | sortByFavorites: sortBy | sortByTime: sortBy">
        <div class="photo">
          <img class="img-fluid" src="{{photo.data.photo_url}}" alt="{{photo.data.name}}">
          <button class="delete" (click)="deletePhoto(photo.id, photo.data.name)"><span class="icon-cross"></span></button>
          <a class="search zoom" data-fancybox="wedding" href="{{photo.data.photo_url}}"><span class="icon-search"></span></a>
          <button class="star" [ngClass]="{'start-on': photo.data.favorite == true}" (click)="toggleFavorite(photo.id, photo)"><span class="icon-star-full"></span></button>
          <button class="download" (click)="downloadImg()"><span class="icon-download"></span></button>
          <a [href]="photo.data.photo_url" download></a>
        </div>
      </div>
    </div>

推荐答案

以防万一其他人在这里发布了相同的问题，到目前为止，这是使用Firebase存储实现此目的的最佳方法.函数 userSettings 中的字符串只是一个字符串(当前用户登录名的ID)，而 filename 是要从Firebase存储下载的文件的名称

Just in case some else have the same problem here i post the answer, so far this is the best way to make this using the firebase storage. in the function userSettings is just a string (id of the current user login) and filename is the name of the file to download from the firebase storage

下载功能

  public downloadFile(userSettings: string, filename): void {
    this.storageRef.ref().child(`weddingDreamPhotos/${userSettings}/${filename}`)
      .getDownloadURL().then((url) => {
          const xhr = new XMLHttpRequest();
          xhr.responseType = 'blob';
          xhr.onload = (event) => {
            /* Create a new Blob object using the response
            *  data of the onload object.
            */
            const blob = new Blob([xhr.response], { type: 'image/jpg' });
            const a: any = document.createElement('a');
            a.style = 'display: none';
            document.body.appendChild(a);
            const url = window.URL.createObjectURL(blob);
            a.href = url;
            a.download = filename;
            a.click();
            window.URL.revokeObjectURL(url);
          };
          xhr.open('GET', url);
          xhr.send();
        }).catch(function(error) {
          // Handle any errors
          console.log(error);
        });
      }

这篇关于从URL下载Angular 4文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！