Angular 14 DrawingFlows

Currently, I am experimenting with incorporating the DrawFlow library into Angular 14.

Below is the component I am using:

drawing-board.component.ts

import { Component, OnInit } from '@angular/core';
import Drawflow from 'drawflow';
@Component({
  selector: 'app-drawing-board',
  templateUrl: './drawing-board.component.html',
  styleUrls: ['./drawing-board.component.css']
})
export class DrawingBoardComponent implements OnInit {

  constructor() { }
  editor:Drawflow|null= null;
  ngOnInit(): void {
    let element = <HTMLElement> document.getElementById('drawflow');
    console.log(element);
    this.editor = new Drawflow(element);
    this.editor.reroute = true;
    this.editor.curvature = 0.5;
    this.editor.reroute_fix_curvature = true;
    this.editor.reroute_curvature = 0.5;
    this.editor.force_first_input = false;
    this.editor.line_path = 1;
    this.editor.editor_mode = 'edit';

    this.editor.start();
  }

}

drawing-board.component.html

<div id="drawflow" class="">
</div>

And implement it in this manner:

<app-drawing-board></app-drawing-board>

However, it seems to be malfunctioning as only an empty HTML div is displayed.

https://i.sstatic.net/Yr1aK.png

Do I need to adjust more attributes? Or could this issue be due to a flawed implementation?

Answer №1

Transform the component into a standalone entity by tweaking the @Component decorator and including the following lines at the bottom.

https://angular.io/guide/standalone-components

standalone: true,
  imports: [CommonModule]

Afterwards, you can import it as its own module directly to the desired location or into the app.module.ts file.

@NgModule({
… omitted 
  imports: [
    BrowserModule,
    AppRoutingModule,
    DrawingBoardComponent
enter code here
  ],
… omitted 
})

The root cause of the issue seems to be that the component is not being called or loaded into the nearest associated module. To resolve this frustrating problem, each component essentially becomes its own module, enabling lazy loading of components - which in turn addresses various initialization errors that may arise.

You can explore more about the rationale behind this and find additional information on the Angular technology in a blog post I came across. Just to clarify, I have no affiliation with the author.

https://angular.io/guide/lazy-loading-ngmodules

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