ngClass Directive: Ionic 2

Today lets learn how to make use of ngClass angular directive in our Ionic 2 application.

Related Read:
ngIf, index, first, last: Ionic 2

ngClass Directive: Ionic 2

Company Names: src/pages/home/home.ts

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

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
items: any = [];
  constructor() {
    this.items = [
      'Microsoft',
      'Apple',
      'Oracle',
      'Google',
      'IBM',
      'Tesla',
      'Technotip'
    ];
  }
}

We have an array of company names which is being assigned to variable items.

Output
Microsoft
Apple
Oracle
Google
IBM
Tesla
Technotip

CSS Class: src/pages/home/home.scss

page-home {
    .bold{
        font-weight: bolder;
    }
    .normal{
        font-weight: normal;
    }
}

We define two CSS classes which we use to apply for alternate list items – using ngClass directive. Alternatively the list items appear in bold and in normal font weight.

ngClass Directive – using ternary operator: src/pages/home/home.html

  
    
      Company Names
    
  




  
    {{i+1}}. {{item}}
  

Here we use ternary operator and whenever i % 2 is zero we apply bold class to that item, if not we apply normal class to that list item.

ngClass Directive: src/pages/home/home.html

  
    
      Company Names
    
  




  
    {{i+1}}. {{item}}
  

This is yet another way of doing the same thing which we did using ternary operator above. Here, if i % 2 is equal to zero, then bold class will be applied, if not it won’t be applied.

changing colors: src/pages/home/home.scss

page-home {
    .bold{
        font-weight: bolder;
        color: blue;
    }
    .normal{
        font-weight: normal;
        color: green;
    }
}

Alternatively the list items appear in bold and in normal font weight, along with blue and green colors respectively.