How do I conditionally add a class in aurelia template - aurelia

Question

I am looking at a way to add a class dynamically to aurelia template. I have to add an active class if the particular li is visible.
Example
<section id="jobsCategoryContainer" class="jobsCategoryContainer">
<h1>{{title}}</h1>
<div *ngFor = "#slide of jobCategorySlides; #i = index" id="job-category-slide_{{i}}" class="job-category-slide" [ngClass]="{active: initialCarouselIndex == i}">
<ul *ngFor = "#item of slide">
<li class="jobDetails" *ngFor="#job of item; #i = index">
<div>
<span id="{{job.name}}" class="jobName">{{ job.name }}</span>
</div>
<div>
<span>{{job.noOfJobs}}</span>
</div>
</li>
</ul>
</div>
<div>
Previous
Next
</div>
</section>
I want to add the active class on below code
<div class="phs-widget-body">
<div class="phs-carousel-inner">
<ul repeat.for = "slide of nearByJobSlides" class="phs-item phs-grid-row" >
<li repeat.for = "item of slide" class="phs-small-6">
<a href="javascript:void(0)">
<div class="phs-job-title">${item.title}</div>
<div class="phs-job-info">
<span class="phs-job-loacation">${item.location}</span>
<span class="phs-job-category">${item.category}</span>
</div>
</a>
</li>
</ul>
</div>
</div>
<div class="phs-widget-footer">
<a class="left" href="#phsNearbyJobs" role="button" data-slide="prev">
<i class="fa fa-angle-left"></i> Move to Previous
</a>
<ol class="phs-carousel-indicators">
<li repeat.for = "slide of nearByJobSlides" data-target="#phsNearbyJobs" data-slide-to="${$index}" class="" click.trigger="changeActiveClass()"></li>
</ol>
<a class="right" href="#phsNearbyJobs" role="button" data-slide="next">
Move to Next <i class="fa fa-angle-right"></i>
</a>
</div>
As well how do I pass an event Object on aurelia?

Answer 1

Just use interpolation
<div class="${ applyMyClass ? 'my-class' : '' }">
E.g.
<div class="${ carouselIndex == $index ? 'active' : '' }">
You don't need to do this with a click event, it's the same as ng2 (only less code!)