如何在 Angular 7 中显示 Base64 图像？

Question

我想获取 base64 字符串并用它来显示图像。
下面是 HTML 文件。我想使用 base64 字符串并在 img 标签中使用它：

<ion-content>
  <ion-card>
      <img src={{imageFileBinary}} />
        <ion-card-header>
            <form>
                <ion-input id="myform" type="file" name="file" (change)="postMethod($event.target.files)"></ion-input>
            </form>
        <ion-card-title>Nick</ion-card-title>
    </ion-card>
</ion-content>

我从 .ts 文件中获取 imageFileBinary。
下面是 .ts 文件：

export class MyprofilePage implements OnInit {


  imageFileBinary;

  userDetails: UserDetails;
  constructor(private profileDetailService: ProfileDetailsService, private httpClient: HttpClient) {}

  fileToUpload;

  getProfileDetails() {
    this.profileDetailService.getUserDetails('email').subscribe((userDetails: UserDetails) => {
      this.imageFileBinary = userDetails.imageFileBinary
    });
  }
  postMethod(files: FileList) {
    this.fileToUpload = files.item(0);
    let formData = new FormData();
    formData.append('file', this.fileToUpload, this.fileToUpload.name);

    this.httpClient.post("http://localhost:8080/uploadFile", formData).subscribe((val)=> {
      console.log(val);
    });
    return false;
  }
  ngOnInit() {
    this.getProfileDetails();

  }

}


How can I use the base64 String in the img tag?

Answer 1

尝试这个..

使用 javascript btoa 函数将图像二进制数据转换为 base64，并附加 data uri 属性。

imageUrl; //rename imageFileBinary to imageUrl

let imageBinary = userDetails.imageFileBinary; //image binary data response from api
let imageBase64String= btoa(imageBinary);
this.imageUrl = 'data:image/jpeg;base64,' + imageBase64String;

最后用角度数据绑定设置它

<img src={{imageUrl}} />