Angular5 Base64

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <script type="text/javascript" charset="utf-8">
      window.AngularVersionForThisPlunker = 'latest'
    </script>
    <title>angular playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>
  
  <body>
    <my-app>
    </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

Demostrates the handling of Base64 Encoded Image in Angular.

var angularVersion;
if(window.AngularVersionForThisPlunker === 'latest'){
  angularVersion = ''; //picks up latest
}
else {
  angularVersion = '@' + window.AngularVersionForThisPlunker;
}

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    '@angular/core': 'npm:@angular/core'+ angularVersion + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
    '@angular/common/http': 'npm:@angular/common' + angularVersion + '/bundles/common-http.umd.js',
    '@angular/compiler': 'npm:@angular/compiler' + angularVersion  + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http' + angularVersion + '/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router' + angularVersion +'/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core' + angularVersion + '/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-testing.umd.js',
    '@angular/common/http/testing': 'npm:@angular/common' + angularVersion + '/bundles/common-http-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http' + angularVersion + '/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router' + angularVersion + '/bundles/router-testing.umd.js',
    'tslib': 'npm:tslib@1.6.1',
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule, VERSION, Input, OnInit} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {Base64ImageComponent} from './base64image.component';
@Component({
  selector: 'my-app',
  templateUrl: 'src/app.component.html'
})
export class App implements OnInit{
  name:string;
  
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App , Base64ImageComponent ],
  bootstrap: [ App ]
})
export class AppModule {}

<div class="form-group row">
    Base64 Image Demo
   <base64-image></base64-image>
   
</div>


<div class="form-group row">
    <input type="file" name="image" (change)="onFileChanged($event)">
    <div class="info" *ngIf="filePreview">
        <img [src]="sanitize(filePreview)"/>
    </div>
</div>

//our root app component
import {Component, NgModule, VERSION, Input, OnInit} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {DomSanitizer} from '@angular/platform-browser';

@Component({
  selector: 'base64-image',
  templateUrl: 'src/base64image.component.html'
})
export class Base64ImageComponent implements OnInit{
  
  fileName: string;

  filePreview: string
  
  constructor(private sanitizer: DomSanitizer) { }
  
  onFileChanged(event) {

    let reader = new FileReader();
    if (event.target.files && event.target.files.length > 0) {
      let file = event.target.files[0];
      reader.readAsDataURL(file);
      reader.onload = () => {
         alert(reader.result.split(',')[1]);
        this.fileName = file.name + " " + file.type;
        this.filePreview = 'data:image/png' + ';base64,' + reader.result.split(',')[1];
      };
    }
  }
  
  sanitize(url: string) {
    //return url;
    return this.sanitizer.bypassSecurityTrustUrl(url);
  }
  
}