JSFiddle - React, Tailwind, and code Playground

by Shaunak Deshpande

HTML

<body>
    <div id='overlay'><input id='bt' type='button' value='Enter'>
      </div></div>
        <div class="upper">
        <div class="abc">here</div>
    </div>
<div align='center' class='con'>    
   
</body>

CSS

.con {
    width: 200px;
    height: 200px;
    position: absolute;
    left: 100px;
    top: 50px;
}
.abc {
    width: 100px;
    height: 100px;
    line-height: 100px;
    text-align: center;
    background: red;
    color: white;
    position: absolute;
    left: 20px;
    top: 20px;
}

JavaScript

(function ($) {
    $.fn.drags = function (opt) {

        opt = $.extend({
            handle: "",
            cursor: "move"
        }, opt);

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

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

    }
})(jQuery);

$('.abc').drags();
$(function () {

    var docHeight = $(document).height();

   // $("body").append("<div id='overlay'></div>");

    $("#overlay")
        .height(docHeight)
        .css({
        'opacity': 0.4,
            'position': 'absolute',
            'top': 0,
            'left': 0,
            'background-color': 'black',
            'width': '100%',
            'z-index': 5000
    });
  // $("#overlay").append("<div...