New base code for mempool blockchain explorerer

frontend/src/app/components/qrcode/qrcode.component.html

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+<canvas #canvas></canvas>

frontend/src/app/components/qrcode/qrcode.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { QrcodeComponent } from './qrcode.component';
+
+describe('QrcodeComponent', () => {
+  let component: QrcodeComponent;
+  let fixture: ComponentFixture<QrcodeComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ QrcodeComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(QrcodeComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

frontend/src/app/components/qrcode/qrcode.component.ts

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+import { Component, Input, AfterViewInit, OnDestroy, ViewChild, ElementRef } from '@angular/core';
+import * as QRCode from 'qrcode/build/qrcode.js';
+
+@Component({
+  selector: 'app-qrcode',
+  templateUrl: './qrcode.component.html',
+  styleUrls: ['./qrcode.component.scss']
+})
+export class QrcodeComponent implements AfterViewInit, OnDestroy {
+  @Input() data: string;
+  @ViewChild('canvas') canvas: ElementRef;
+
+  qrcodeObject: any;
+
+  constructor() { }
+
+  ngAfterViewInit() {
+    const opts = {
+      errorCorrectionLevel: 'H',
+      margin: 0,
+      color: {
+        dark: '#000',
+        light: '#fff'
+      },
+      width: 125,
+      height: 125,
+    };
+
+    if (!this.data) {
+      return;
+    }
+
+    QRCode.toCanvas(this.canvas.nativeElement, this.data.toUpperCase(), opts, (error: any) => {
+      if (error) {
+         console.error(error);
+      }
+    });
+  }
+
+  ngOnDestroy() {
+  }
+
+}