JSFiddle - React, Tailwind, and code Playground

HTML

<button id="on">Drag On</button>
<button id="off">Drag Off</button>
<div id="mydiv"></div>

CSS

#mydiv {
    height: 50px;
    width: 50px;
    background: #000;
}

JavaScript

$.fn.extend({
    cannotDragMe: function () {
        return this.each(function () {
            var $this = $(this);
            $this = $(this);
            return $this.css('cursor', 'default').off("mousedown.drag").off("mousemove.drag").off("mouseup.drag");
        });
    },
    canDragMe: function (opt) {
        opt = $.extend({
            handle: "",
            cursor: "move"
        }, opt);

        var $el;
        if (opt.handle === "") {
            $el = this;
        } else {
            $el = this.find(opt.handle);
        }

        return $el.css('cursor', opt.cursor).on("mousedown.drag", function (e) {
            var $drag;
            if (opt.handle === "") {
                $drag = $(this).addClass('draggable');
            } else {
                $drag = $(this).addClass('active-handle').parent().addClass('draggable');
            }
            var z_idx = $drag.css('z-index'),
                drg_h = $drag.outerHeight(),
                drg_w = $drag.outerWidth(),
                pos_y = $drag.offset().top + drg_h - e.pageY,
                pos_x = $drag.offset().left + drg_w - e.pageX;
            $drag.css('z-index', 1000).parents().on("mousemove.drag", function (e) {
                $('.draggable').offset({
                    top: e.pageY + pos_y - drg_h,
                    left: e.pageX + pos_x - drg_w
                }).on("mouseup.drag", function () {
                    $(this).removeClass('draggable').css('z-index', z_idx);
                });
            });
            e.preventDefault(); // disable selection
        }).on("mouseup.drag", function () {
            if (opt.handle === "") {
                $(this).removeClass('draggable');
            } else {
                $(this).removeClass('active-handle').parent().removeClass('draggable');
            }
        });
    }
});

$('#on').click(function () {
    $('#mydiv').canDragMe();
});
$('#off').click(function () {
    $('#mydiv').cannotDragMe();
});