innerHTML is not working with Angular ng-drag-drop

Question

I am trying to implement nested drag and drop functionality in angular project. For this I am using https://www.npmjs.com/package/ng-drag-drop.

HTML:

<ul>
  <li class="parent" draggable [dragScope]="'parentLayout'">Row with Tow Columns</li>
</ul>

<div droppable [dropScope]="'parentLayout'" [dragOverClass]="'drag-target-border'" (onDrop)="onLayoutDrop($event)">
  <div class="layout-container">Add Element Container Here</div>
</div>

Inside the 'layout-container' I want to drag and drop another HTML code. which is:

<div class="container">
  <div class="row">
    <div class="col-6" droppable [dropScope]="'element'">Column A - Add Element</div>
    <div class="col-6" droppable [dropScope]="'element'">Column B - Add Element</div>
  </div>
</div>

As you can notice, I want to enable second droppable div inside parent div. This works perfectly when I hardcoded the code. However, I want to fetch the code from database. So I tried using innerHTML, but its not detecting the ng-drag-drop scopes (droppable, [dropScope], etc).

.ts

inner_html: string = '';

// Fetched from database
layout: any = `<div class="container">
      <div class="row">
        <div class="col-6" droppable [dropScope]="'element'">Column A - Add Element</div>
        <div class="col-6" droppable [dropScope]="'element'">Column B - Add Element</div>
      </div>
    </div>`;

innerElement: string = `<h1>Final Element</h1>`; // This is fetched from database

onLayoutDrop(){
 this.inner_html += this.layout;
}

.html

  <ul>
     <li class="parent" draggable [dragScope]="'parentLayout'">Row with Tow Columns</li>
  </ul>
    
   <div droppable [dropScope]="'parentLayout'" [dragOverClass]="'drag-target-border'" (onDrop)="onLayoutDrop($event)">
      <div class="layout-container">Add Element Container Here</div>
   </div> 

   <div class="innerhtml" [innerHTML]="layout"></div>

I think that this answer might help you as well to apply directives to dynamically inserted html coming from a database — Pieterjan
– Pieterjan, Commented Oct 20, 2022 at 18:17
@Pieterjan I really do not think that this is the solution for his problem. He should better just fetch the data from the db, inject it via @Input() to components that are rendered with ngFor. There is a bad misconception in his model when the HTML is saved in the db — SirOneOfMany
– SirOneOfMany, Commented Oct 26, 2022 at 12:16

SirOneOfMany · Accepted Answer · 2022-10-26 12:30:34Z

Hey I hope you have the possibility to change your data that is fetched from the api. I really hope you get a proper model in JSON format and do not get some rigged HTML from your backend.

Because:

The data persistence should not know how the data is presented
HTML in the Database is a security flaw
With innerHtml you are working around angulars change detection

My advice: If it feels quirky to implement, it usually is quirky to implement.

So to a solution for your very problem:

Separate Data from Layout:

export interface SomeElement {
   description: string;
}

Use *ngFor

<div class="container">
   <div class="row">
      <div class="col-6" droppable [dropScope]="'element'" *ngFor="let element of elementsFromDb">{{ element.description }}</div>
   </div>
</div>

fetch data

elementsFromDb: SomeElement = /* fetch an array that looks like this [{ description: 'Column A - Add Element' }, { description: 'Column B - Add Element'}] */

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