How to add class on click event in Aurelia? - css

Question

I'm new to aurelia. I'm looking to find the best method for adding classes on click events.
I simply want to click approve or request information, and then add a class to the corresponding "contact card". This class would change the background color.
I know it's probably simple, but I thought I'd look here for the best method.
Here's an image to what I've got:
Apologies for the wait, work has been a bit busy.
This is my first time posting on S.O., so I apologize for any expectations I'm not meeting.
<div class="col-sm-4">
<button class="btn btn-success col-sm-12" click.delegate="goodBoi()">
approve contact
</button>
</div>
<div class="col-sm-4">
<button class="btn btn col-sm-12" click.delegate="requestContact()">
request information
</button>
</div>
</div>
the element to be changed is named "list-group-item", containing the
contact's details(code shown above).
<template>
<div class="contact-list">
<ul class="list-group">
<li repeat.for="contact of contacts" class="list-group-item ${contact.id === $parent.selectedId ? 'active' : ''}">
<a route-href="route: contacts; params.bind: {id:contact.id}" click.delegate="$parent.select(contact)">
<h4>${contact.firstName} ${contact.lastName}</h4>
<p>${contact.company}</p>
<p>${contact.email}</p>
<h6>${contact.approval}</h6>
</a>
<a route-href="route: contacts; params.bind: {id:contact.id}">
<p>${contact.phoneNumber}</p>
</a>
</li>
</ul>
</div>
goodBoi() {
let result = confirm("Are you sure you want to confirm this contact?");
if (result === true) {
var standingShell = document.getElementsByClassName("list-group-item");
//im hoping here I would add a class to the new variable//
this.contact.approval = 'approved';
this.save();
}
}
//confirms contact, changing color of approved contact//
//same thing here, just plan to give it a different color//
requestContact() {
let contactRequestText = "request sent to contact";
this.routeConfig.navModel.setTitle(this.contact.approval = contactRequestText);
this.ea.publish(new ContactUpdated(this.contact));
}

Answer 1

There are many ways to set a CSS-class using Aurelia. Following I prepared an example gist:
Template:
<template>
<h1>${message}</h1>
<div class="form-group ${clicked ? 'red' : 'blue'}" style="width: 100px; height: 100px;">
</div>
<div class="form-group">
<button click.delegate="save()">
Click me
</button>
</div>
</template>
And the code class:
#autoinject
export class App {
#bindable clicked = false;
save(){
this.clicked = true;
}
}
https://gist.run/?id=425993b04a977466fa685758389aa2b4
But there are other, cleaner ways:
using ref in a custom element.
custom attributes.
Include jQuery for using e.g. $('#myelement').addClass()