Access the PrimeNG context menu in Angular 2 by using code to open it

Question

Access the PrimeNG context menu in Angular 2 by using code to open it

I am trying to open the context menu provided by PrimeNG in a table by using a button and right click. Although I have found the methods 'toggle' and 'show' in the component, the menu is not opening. Even after setting a new position for the menu when calling the method, the 'display' property remains 'none'. In order to access the 'contextMenu' component from the template in typescript, I am utilizing ViewChild in Angular.

angular typescript primeng

Answer 1

Answer №1

Implement a context menu along with a click event on a button, span, or div that makes use of a local variable (cm in this case) and invokes the show or toggle function.

<p-contextMenu #cm [model]="items"></p-contextMenu>

<button (click)="cm.show($event);$event.stopPropagation();">Show context</button>

You can also delegate this to a function for handling:

(click)="showContext(cm, $event)"

In the TypeScript file:

showContext(cm: ContextMenu, event :MouseEvent) {
  cm.show(event);
  event.stopPropagation();
}

An important aspect to consider (especially on PrimeNG 7) is the event.stopPropagation(). Without this, the context menu may react to the show() event but not display properly.

Another key point is passing the mouse event in the show() function to ensure the context menu appears at the cursor position instead of elsewhere on the page.

If you need to trigger the show/toggle function programmatically without a click event using ViewChild, you may opt to manually modify the style by changing display:none to display:block (as suggested by Y. Tarion in a comment).

Answer 2

Implement a context menu along with a click event on a button, span, or div that makes use of a local variable (cm in this case) and invokes the show or toggle function.

<p-contextMenu #cm [model]="items"></p-contextMenu>

<button (click)="cm.show($event);$event.stopPropagation();">Show context</button>

You can also delegate this to a function for handling:

(click)="showContext(cm, $event)"

In the TypeScript file:

showContext(cm: ContextMenu, event :MouseEvent) {
  cm.show(event);
  event.stopPropagation();
}

An important aspect to consider (especially on PrimeNG 7) is the event.stopPropagation(). Without this, the context menu may react to the show() event but not display properly.

Another key point is passing the mouse event in the show() function to ensure the context menu appears at the cursor position instead of elsewhere on the page.

If you need to trigger the show/toggle function programmatically without a click event using ViewChild, you may opt to manually modify the style by changing display:none to display:block (as suggested by Y. Tarion in a comment).

Answer 3

Answer №2

If you want to programmatically open a contextMenu in PrimeNG, there is a slightly tricky way to do it.

First, you need to define your ContextMenu in your template:

<p-contextMenu #cm [global]="true" [model]="items"></p-contextMenu>

Next, add the following code to your button: (click)="toggle($event)"

Then, in your typescript file, you can use the following example for the toggle method:

  toggle(event){
    if(!this.cm.containerViewChild.nativeElement.style.display ||
      this.cm.containerViewChild.nativeElement.style.display == 'none') {
      //Open contextual menu
      setTimeout(() => {
        this.cm.position(event);
        this.cm.containerViewChild.nativeElement.style.display = 'block';
        this.cm.containerViewChild.nativeElement.style.visiblility = 'visible';
      }, 0);
    }else{
      //close contextual menu
      setTimeout(() => {
        this.cm.containerViewChild.nativeElement.style.display = 'none';
      }, 0);
    }
  }

Remember to define cm as your ContextMenu in your typescript file:

@ViewChild("cm") cm:ContextMenu;

Alternatively, you can also consider using the PrimeNG's tiered menu for this purpose.

Answer 4

If you want to programmatically open a contextMenu in PrimeNG, there is a slightly tricky way to do it.

First, you need to define your ContextMenu in your template:

<p-contextMenu #cm [global]="true" [model]="items"></p-contextMenu>

Next, add the following code to your button: (click)="toggle($event)"

Then, in your typescript file, you can use the following example for the toggle method:

  toggle(event){
    if(!this.cm.containerViewChild.nativeElement.style.display ||
      this.cm.containerViewChild.nativeElement.style.display == 'none') {
      //Open contextual menu
      setTimeout(() => {
        this.cm.position(event);
        this.cm.containerViewChild.nativeElement.style.display = 'block';
        this.cm.containerViewChild.nativeElement.style.visiblility = 'visible';
      }, 0);
    }else{
      //close contextual menu
      setTimeout(() => {
        this.cm.containerViewChild.nativeElement.style.display = 'none';
      }, 0);
    }
  }

Remember to define cm as your ContextMenu in your typescript file:

@ViewChild("cm") cm:ContextMenu;

Alternatively, you can also consider using the PrimeNG's tiered menu for this purpose.

Access the PrimeNG context menu in Angular 2 by using code to open it

Answer №1

Answer №2

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