The routerLinkActive is an instruction to add the active class of CSS when an element routerlink is active. The routerLinkActive attribute, which is used to specify a CSS class that the element will be assigned to when the URL specified by the routerLink attribute matches the active route. Use the routerLinkActive attribute when a specific route is active for style an element. In the HTML we using like this

<a href="link">Text</a>

But this is not the best way in angular. Yes, this code is working in angular but this is not the best and professional way. routerlink is provided by angular to work with the internal system route. You cannot use routerlink for the link to the external website.routerlink is only work for internal links. For the external system route, you can use href to link the websites.

<a [routerlink]="/link">text</a>


You can say that routerlinkactive is the instruction that is used for assigned the class of CSS (active class) when URL specified by the routerlink attribute matches with the active route.

The configuration is performed using a binding on the routerLinkActiveOptions attribute, which accepts a literal object. The exact property is the only available configuration setting and is used to control matching the active route URL. Setting this property true will add the element to the class specified by the routerLinkActive attribute only when there is an exact match with the active route’s URL. Consider the following example for active a link

<a routerLink="/user/detail" routerLinkActive="active-link">User Detail</a>

The CSS file defines the global style.

background-color: yellow;
color: black;

Multiple Classes

You can also set more than one class as showing in the following example.

<a routerLink="/user/detail" routerLinkActive="active-class1 active-class2">User detail</a>
<a routerLink="/user/detail" [routerLinkActive]="['active-class1', 'active-class2']">User detail</a>

Child Route

routerlinkactive is used and working for both child and parent routes. Child route example showing as below.

<a routerLink="/product" routerLinkActive="class1 class2">Product</a>
<a routerLink="/product/PC" routerLinkActive="class1 class2">PC</a>
<a routerLink="/product/mobile" routerLinkActive="class1 class2">Mobile</a>

In the above example, the product is the parent route, pc and mobile is the child route.

Examples of routerlinkactive

<ul class="nav navbar-nav">
  <li><a routerLink="/" routerLinkActive="active"
        [routerLinkActiveOptions]="{ exact: true }">Home</a></li>
  <li><a routerLink="/about" routerLinkActive="active" >About</a></li>
  <li><a routerLink="/contact" routerLinkActive="active" >Contact</a></li>

and you can also use bootstrap classes in routerlinkactive as showing in the following example.

<div class="col-3">
 <button class="btn btn-secondary btn-block"
 routerLink="/table" routerLinkActive="bg-primary"
 [routerLinkActiveOptions]="{exact: true}">
 <button *ngFor="let category of categories"
 class="btn btn-secondary btn-block"
 [routerLink]="['/table', category]"


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