converter/app/app.component.html

<div *ngFor="let step of steps" class="wrapper">
    <textarea class="input" (change)="update(step)" placeholder="Please enter your input ..."
              [(ngModel)]="step.content">{{step.content}}</textarea>
    <select class="conversion" (change)="convert(step, $event)">
        <option id="-1">Select conversion ...</option>
        <option *ngFor="let c of converters" id="{{c.getId()}}">{{c.getDisplayname()}}</option>
    </select>
    <div class="message" *ngIf="step.error">{{step.message}}</div>
</div>