JSFiddle - React, Tailwind, and code Playground

by painotpi

HTML

<div id="navshow"> <a class="m-btn rnd black mobile-hide current_page_item" href="">Home</a>
 <a class="m-btn rnd black mobile-hide" href="">About</a>
 <a class="m-btn rnd black mobile-hide" href="">Projects</a>
 <a class="m-btn rnd black mobile-hide" href="">Quality</a>
 <a class="m-btn rnd black mobile-hide" href="">Products</a>
 <a class="m-btn rnd black mobile-hide" href="">Contact Us</a>
 <a class="m-btn rnd black mobile-hide" href="">Links</a>

</div>

CSS

#magic-line {
    position: absolute;
    top: -2px;
    left: 0;
    width: 100px;
    height: 10px;
    background: red;
}
a {
    border: 1px solid;
}

JavaScript

$(function () {

    var $el, leftPos, newWidth,
    $mainNav = $("#navshow");

    $mainNav.append("<span id='magic-line'></span>");
    var $magicLine = $("#magic-line");

    $magicLine.width($(".current_page_item").width())
        .css("left", $(".current_page_item a").position().left)
        .data("origLeft", $magicLine.position().left)
        .data("origWidth", $magicLine.width());

    $("#navshow a").mouseenter(function () {
        alert("asd");
        $el = $(this);
        leftPos = $el.position().left;
        newWidth = $el.parent().width();
        $magicLine.stop().animate({
            left: leftPos,
            width: newWidth
        });
    });
});