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Usage of ngStyle

ngStyle is used to add styles to the dynamic data coming via services based on some logic in typeScript file. Otherwise simple css might not be applied as there is no specific way to add it -- for data which is still not fetched or which may have some value based on which present css should be applied.

ngStyles is used to add styles on the fly or dynamically for data coming from server in asynchronous Rest API Calls

Practical Example of [ngStyle]

Please follow the mentioned steps:

  1. Create a component 'home' using which we will demonstrate use of ngStyle
  2. We will create an array of objects (5 people) and add various CSS styles based on the object values. For example: background is red if a person is citizen of USA otherwise blue, similarly the content will be underline if 'gender' is female and font-weight is bold if person has age greater or equal to 18.


  <li *ngFor="let x of students" [ngStyle]="{
    'font-weight': x.age > 18? 'bold': 'normal',
    'background': x.country == 'USA'? 'red': 'blue',
    'text-decoration': x.gender == 'female'? 'underline': 'none'
  }"> {{x.name}}, {{x.age}}, {{x.country}}</li>


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

  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.css']
export class HomeComponent implements OnInit {

  students = [
    {name: 'Peter', age: 29, country: 'USA', gender: 'male'},
    {name: 'Lily', age: 17, country: 'UK', gender: 'female'},
    {name: 'Albert', age: 45, country: 'China', gender: 'male'},
    {name: 'Rosy', age: 25, country: 'USA', gender: 'female'},
    {name: 'Siliva', age: 15, country: 'Canada', gender: 'female'}

  constructor() { }

  ngOnInit() {

  1. You'll get the following result.

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