If you don't actually need to utilize the JQuery UI library, you can use the following code I found on jsfiddle at http://jsfiddle.net/mkUJf/666/
"div#modalbox-container" could be anything. I just chose to use the outer container of the modal.
//make modal draggable
$(function () {
$('body').on('mousedown', 'div#modalbox-container', function () {
$(this).addClass('draggable').parents().on('mousemove', function (e) {
$('.draggable').offset({
top: e.pageY - $('.draggable').outerHeight() / 2,
left: e.pageX - $('.draggable').outerWidth() / 2
}).on('mouseup', function () {
$(this).removeClass('draggable');
});
});
e.preventDefault();
}).on('mouseup', function () {
$('.draggable').removeClass('draggable');
});
});
Or you can add a jquery plugin like the following:
ref: https://css-tricks.com/snippets/jquery/draggable-without-jquery-ui/
(function($) {
$.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);
Both pieces of code are pretty much plug and play.