Django ajax

<script type="text/javascript">
$(document).ajaxSend(function(event, xhr, settings) {  
    function getCookie(name) {  
        var cookieValue = null;  
        if (document.cookie && document.cookie != '') {  
            var cookies = document.cookie.split(';');  
            for (var i = 0; i < cookies.length; i++) {  
                var cookie = jQuery.trim(cookies[i]);  
                // Does this cookie string begin with the name we want?  
                if (cookie.substring(0, name.length + 1) == (name + '=')) {  
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));  
                    break;  
                }  
            }  
        }  
        return cookieValue;  
    }
 function sameOrigin(url)
 {  
      
        var host = document.location.host;
        var protocol = document.location.protocol;  
        var sr_origin = '//' + host;  
        var origin = protocol + sr_origin;  
        // Allow absolute or scheme relative URLs to same origin  
        return (url == origin || url.slice(0, origin.length + 1) == origin + '/') ||  
            (url == sr_origin || url.slice(0, sr_origin.length + 1) == sr_origin + '/')
   ||!(/^(\/\/|http:|https:).*/.test(url));
    }  
    function safeMethod(method) {  
        return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));  
    }  
   
    if (!safeMethod(settings.type) && sameOrigin(settings.url)) {  
        xhr.setRequestHeader("X-CSRFToken", getCookie('csrftoken'));  
    }  
}); 
</script>