Adding a Javascript popup link in a foreach loop laravel

I have a foreach loop and i want to add a javascript popup within it. I have to code for the loop and the popup box, im just struggling with how to write the link, please see below.

'<td><a onclick="popupCenter" "/admin/public/viewlead/. $row->AppID. , "myPop1",450,450"; (' href='javascript:void(0);'> CLICK TO OPEN POPUP " . '</a>' . '</td>';