javascript - Pass URL from data- on href to another href in modal window -

i trying pass url have value of data-url on anchor tag anchor tag role of button. loads in modal window after anchor on page clicked. think issue modal loading result of click event; when in console url present. when click on button in modal or @ href in dom, empty. missing code?

<a href="javascript:void(0); data-sburl="http://linktopass.com">click</a>  $('.order-item-tracking').on('click', function(e) { var sbtargeturl = $(this).attr("data-sburl"); $('.modalbtn').attr('href', sbtargeturl); });