New base code for mempool blockchain explorerer

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

@@ -0,0 +1,43 @@
+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() {
+  }
+
+}