Angular add class dynamically

Question

Is there a way to add a class from the .ts file, using Angular solutions

I want to d

Answer 1

While the solution with the Renderer works, I am proposing you create a data structure for your buttons

buttons: Array<{label: string}> = [
    {
      label: 'Global'
    },
    {
      label: 'Maintenance'
    },
    {
      label: 'Settings'
    },
    {
      label: 'Profile'
    },
    {
      label: 'Transactions'
    }
  ]

This can easily be iterated through using ngFor

<button 
  *ngFor="let button of buttons" 
  class="general" 
  (click)="ChangeScreen(button.label)" 
  [class.selected]="CurrentPage == button.label">
  {{ button.label }}
</button>

And only thing your ChangeScreen method would need is... the thing its already doing, setting the current page!

See stackblitz for an example of how this plays out.

Answer 2

Use Renderer

See here:https://angular.io/api/core/Renderer

and here:https://angular.io/api/core/Renderer#setElementClass

import { Renderer } from '@angular/core';

constructor(private render:Renderer) { }

ChangeScreen(event:any) {
 this.renderer.setElementClass(event.target,"selected",true);
}

In html:

<button class="general" (click)="ChangeScreen()">Global</button>

Or Render2:

See here:https://angular.io/api/core/Renderer2

and here:https://angular.io/api/core/Renderer2#addClass

import { Renderer2 } from '@angular/core';

constructor(private render:Renderer2) { }

ChangeScreen(event:any) {
 this.renderer.addClass(event.target,"selected");
}

In html:

<button class="general" (click)="ChangeScreen()">Global</button>

Answer 3

You can use ngClass directive:

<div id="mydiv" [ngClass]="{'myCSSclass' : condition}"></div>

Simple as that! myDiv will have the class myCSSclass only when the condition evaluates to true. This condition can be set in your typescript file or in the template.