What common mistakes should I avoid while using ngModel with Angular Material Inputs?

Having trouble loading data into the input form. There seems to be a simple oversight or mistake on my part.

This is the HTML code I am using:

            <mat-form-field>
                <input matInput [(ngModel)]="name" placeholder="Folienname">
            </mat-form-field>

            <mat-form-field>
                <input matInput type="text" [(ngModel)]="text" placeholder="Nachricht">
            </mat-form-field>

            <mat-form-field>
                <mat-select [(value)]="color" placeholder="Schriftfarbe">
                    <mat-option value="#ffffff">White</mat-option>
                    <mat-option value="#bfbfbf">Lightgrey</mat-option>
                    <mat-option value="#808080">Grey</mat-option>
                </mat-select>
            </mat-form-field>

Here is the TypeScript code:

export class SlideEditorComponent implements OnInit {

  slides: Slide[];

  name: string = '';
  text: string = '';
  color: string = "#000000";

  constructor(
    private slideService: SlideService,
    private event: EventService
  ) {
    this.event.subscribe('edit-slide-data', (slide: Slide) => {
      this.updateValues(slide);
    });
  }

  ngOnInit() {
    this.slideService
      .getSlides()
      .subscribe((data: Slide[]) => {
        this.slides = data;
      })
  }

  onSaveSlide() {
    this.slideService.addSlide(
      this.name,
      this.text,
      this.color
    );
    this.name = '';
    this.text = '';
    this.color = "#000000";
  }

  updateValues(slide) {
    this.name = slide.name;
    this.text = slide.text;
    this.color = slide.colour;
  }
}

The "this.event.subscribe" function is used for communication between components. When logging the data, it appears to be parsed correctly but does not display in the input fields. Any assistance would be greatly appreciated. Thank you!

Answer №1

To ensure the input works correctly, don't forget to include a name attribute:

 <input matInput name="someName" [(ngModel)]="name" placeholder="Folienname">

For example:

            <mat-form-field>
                <input matInput name="name" [(ngModel)]="name" placeholder="Folienname">
            </mat-form-field>

            <mat-form-field>
                <input matInput name="text" type="text" [(ngModel)]="text" placeholder="Nachricht">
            </mat-form-field>

Answer №2

Encountered an issue with Routing to the component and parsing the data simultaneously. The exact root cause is a bit unclear to me, but here's the solution:

Transform this code snippet:

this.event.publish('edit-slide-data', slide);
this.router.routeByUrl('some route');

into this:

this.router.routeByUrl('some route').then(() => {
this.event.publish('edit-slide-data', slide);
});

Your understanding and cooperation are greatly appreciated!

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