Mastering Angular 4: The ultimate guide to managing multiple classes using ngClass

I want to customize my navigation links to resemble file folder tabs by dynamically adding and removing classes using Angular. When a link is active, it should not have a bottom border to indicate it as the primary tab. Here's a rough starting point:

https://i.sstatic.net/JwNcS.png

How can I correctly utilize [ngClass] to toggle classes for my links based on certain conditions?

Issue 1: What is the best way to implement a hover effect for the non-active links? I want them to change to a grey shade when hovered over.

Issue 2: How can I apply the 'active-link' class to one of the links by default, so that it appears active (without a bottom border) upon initial load?

This is what I have implemented so far-

my component.html:

<ul class="nav nav-tabs">
 <li [ngClass]="{'active-link': id === 1 }" id="1"(click)="addClass(id=1)" ><a [routerLink]="['']" data-toggle="tab">All Sites</a></li>
 <li [ngClass]="{'active-link': id === 2 }" id="2"(click)="addClass(id=2)"><a [routerLink]="['/sites/map']" data-toggle="tab">Sites Map</a></li>    
</ul>

My component.css:

li {
  display: inline;
  font-size: 150%;
}
.active-link {
  border-bottom: 1px solid black;
}
.nav li {
  border-radius: 3px;
  border-top: 1px solid black;
  border-left: 1px solid black;
  border-right: 1px solid black;
}

And in my .ts file

export class AppComponent { 
  addClass(id: any) {
  this.id = id;
}
...

What modifications can I make to my code to set the 'active-link' class by default, and implement a hover effect for the non-active links in a clean manner?

Thank you! Feel free to ask if you need further clarification.

Answer №1

To handle tab selection, create a property like selectedTab which functions similar to the id in this context. Apply the active class to the tab only if the selectedTab or id matches the tab's id, while all tabs have the unselected/inactive class. Instead of using ngClass, you can directly write [class.active-link]="id === 1" where 1 corresponds to the tab's id. Initialize the id variable with your default tab in the ngOnInit method (or constructor/default in the class). If there are any gaps in this explanation, feel free to inform me.

For the hover issue, refer to this question: How can I add a class to an element on hover?

.ts file:

export class AppComponent {
  selectedTab = 0;

  constructor() {}
  // Function to select a tab.
  selectTab(tabId: number) {
    this.selectedTab = tabId;
  }
}

.html file:

<ul class="nav nav-tabs">
 <li [class.active-link]="selectedTab === 0" (click)="selectTab(0)"><a data-toggle="tab">All Sites</a></li>
 <li [class.active-link]="selectedTab === 1" (click)="selectTab(1)"><a data-toggle="tab">All Sites</a></li>
</ul>

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