CODEWITHSUNDEEP
htmlcsstwitter-bootstrapangular
Felipe
Felipe

Reputation: 7391

How to set "activate" class to bootstrap navbar in Angular 2 while using page anchor navigation?

I am creating a single page website using Angular 2 and Bootstrap 4.

I created a navbar component that is always on top of the page and I am using page anchor navigation (#id). Please note that I haven't created a routing module (so far it hasn't been necessary to do this).

The navbar code is below:

<nav class="navbar navbar-default fixed-top navbar-inverse navbar-toggleable-md">
  <div class="container">

    <div class="navbar-header">
      <button class="navbar-toggler navbar-toggler-right btn btn-outline-secondary" (click)="isCollapsed = !isCollapsed" [attr.aria-expanded]="!isCollapsed" aria-controls="collapseExample">
        <i class="fa fa-bars" aria-hidden="true"></i>
      </button>
      <a class="navbar-brand" href="index.html">Garatéa</a>
    </div>

    <div id="collapseExample" class="navbar-collapse collapse" [ngbCollapse]="isCollapsed">
      <ul class="nav navbar-nav ml-auto">
        <li class="nav-item"><a class="nav-link" href="#home">Início</a></li>
        <li class="nav-item"><a class="nav-link" href="#about">Sobre</a></li>
        <li class="nav-item"><a class="nav-link" href="#team">Quem Somos</a></li>
        <li class="nav-item"><a class="nav-link" href="#contact">Contato</a></li>
      </ul>
    </div>
  </div>
</nav>

Each link corresponds to a section of the single page website, for example, the home component template is:

<div id="home" class="text-center home-background">
  <div class="overlay">
    <div class="content">
      <h1>Bem vindo à <strong><span class="title-text">Garatéa</span></strong></h1>
      <p class="lead">Somos uma inciativa que <strong>aumenta a taxa de sobrevivência</strong> em emergências médicas.</p>
    </div>
  </div>
</div>

My question is: how can I highlight the link in the navbar that corresponds to the section of the website that I am currently browsing? For example, if I am looking at the team about section, I expect to have an active CSS class on the navbar: <li class="nav-item active"><a class="nav-link" href="#about">Sobre</a></li>.

Upvotes: 2

Views: 1346

Answers (1)

Aravind
Aravind

Reputation: 41573

You can use the srcElement on click of that <a> tag as below 

<a class="nav-link" (click)="clickedLink($event)">Início</a>
<a class="nav-link" (click)="clickedLink($event)">Início</a>
<a class="nav-link" (click)="clickedLink($event)">Início</a>

Method will be as 

clickedLink(e){
let element = e.srcElement;

console.log(e)
for(let i =0; i <element.parentElement.children.length ; i++){
  if(element.parentElement.children[i].classList.contains('active')){
    element.parentElement.children[i].classList.remove('active')
  }
}
element.classList.add('active');

}

LIVE DEMO

Upvotes: 1

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