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Everything You Need to Know About NgStyle in Angular 8

Published on Sep 27,2019 132 Views

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If you have been in the coding industry for some time now, you probably already know that developing dynamic variations can be quite a task in in web applications. Depending on the programming platform you choose to use the level of your complexity tends to vary, but luckily this feat can be easily achieved in Angular 8 and some previous versions of Angular as well. In this article, we will discuss ngstyle in agular 8.

 

Template Property Syntax in Angular 8

Before we go into the depths of exploring all the functions and modules Angular 8 comes with, let us first see the property syntax in Angular 8 and how we can change the color of a <div> color property in pure Java.

ngstyle-in-angular

let myDiv = document.getElementById('my-div');
myDiv.style.color = 'orange'; // updating the div via its properties

Let us do the same task in Angular 8 by making use of the built-in libraries as well as other modules.

<div [style.color]="'orange'">style using property syntax, this text is orange</div>

Use the syntax {property} and efficiently achieve any code and make changes to it almost instantaneously.

 

In the above example, what we have done is accessed directly the div element style property. In comparison to the properties on the DOM object and attribute, this is different.

Using the in-built Angular 8 characteristics, we can add the CSS elements to any class of our choice. See the example below to understand this better.

<div [className]="'blue'">CSS class using property syntax, this text is blue</div>

 

 

NgClass and NgStyle in Angular 8

It is built-in with both ngSyntax and ngClass in Angular 8 and these can be used to suit various purposes. In a way the in-built modules provide sugar for implementing changes to more complex strings than others. Let us take a look at the syntax for ngStyle in Angular 8.

<div [ngStyle]="{'color': 'blue', 'font-size': '24px', 'font-weight': 'bold'}">
style using ngStyle
</div>

In the above example we have made use of ngStyle in Angular to alter the dynamics of multiple elements in our class, while at the same group several elements together in order to facilitate the user to customize the class according to his or her need.

Continuation of the above example.


<div [ngStyle]="{'color': color, 'font-size': size, 'font-weight': 'bold'}">
style using ngStyle
</div>

<input [(ngModel)]="color" />
<button (click)="size = size + 1">+</button>
<button (click)="size = size - 1">-</button>

Now that you know about ngStyle, let’s look at some elements of ngStyle. 

<div [ngClass]="['bold-text', 'green']">array of classes</div>
<div [ngClass]="'italic-text blue'">string of classes</div>
<div [ngClass]="{'small-text': true, 'red': true}">object of classes</div>

ngClass in angular also allows us to make changes to our code in a plethora of ways so that dynamic changes can be implemented in a jiffy, much like the ngStyle.

Take a look at the example below, to view both of them together in action.


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

@Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
color = 'pink';
size = 16;
displayText = 'show-class';
visible = true;
constructor() { }

toggle() {
this.visible = !this.visible;
this.displayText = this.visible ? 'show-class' : 'hide-class';
}
}

 

 

NgClick in Angular 8

Now that you know the basic features of both ngClass and ngStyle and what can be achieved using either or both of them in the Angular 8 platform, let us look into the use of ngClick.

What is ngClick?

If in a particular event you need to bind together multiple elements of a program, so that a single task can be achieved, then you need to make use of ngClick.

<button ng-click="vm.toggleImage()">
<button ng-click="vm.toggleImage($event)">

The above is an example of how ngClick is used in AngularJS. When it comes to Angular8, the same module does not exist, and thus one needs to make use of the following.

<button (click)="toggleImage()">
<button (click)="toggleImage($event)">

The above syntax is used to facilitate event binding in Angular8, wherein we first define the name of the target event along with parentheses and then include a template statement by including quotations as well as equals operator. Once these steps are done, Angular8 sets up an event handler for this event and whenever triggered, this event is executed.

Angular8 is not only one of the most popular programming languages out there, but it is also one of the most dynamic, thanks to its wide array of features. With this, we come to an end of this article on NgStyle in angular. I hope you got an understanding of how these work.

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