Callback function is a function which is executed after the current function (i.e the currently running function) has been executed. As the name signifies Callback function is called back at some ...

<script type="text/javascript"> (function(url, position, callback){ // default values url = url || 'https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js ...

For user authentication, while using AJAX to make a request for an resource which can only be accessed by authenticated user, we can not redirect the user browser to login page if we can not find the ...