JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <a href="#">Link 1</a>
    <a href="#">Link 2</a>
</div>

CSS

a.selected {
    border: 1px solid red;
}

JavaScript

var container = $("div.parent").on("click", "a", function(){
    $(this).addClass("selected");
    container.find("a").not($(this)).removeClass("selected");
});