django ajax

def course_ajax_search(request):
    if request.method == "POST":
        search_text = request.POST.get('search_text')
        # Full text search
        if len(search_text) < 2:
            return HttpResponse(" ")

        courses = Course.objects.filter(
            course_name__contains=search_text
        )
        print(courses)
        courses = serializers.serialize(
            'json', courses, fields=('slug', 'course_name',)
        )
        return HttpResponse(courses, content_type="application/json")
    else:
        return HttpResponseRedirect("/courses")



$(document).ready(function(){
        $("#navbarSearchForm").click(function(){
            // Display search modal box.
            $('#navbar-search-modal').modal('show');
            // Initially set the search result to empty value.
            $("#navbar-search-result").html("");
            // On click keyup modalSearchForm do ajax search
            $("#modalSearchForm").keyup(function(){
                // Check for empty input and value less than 3 character.
                console.log("Keyup is pressed with value"+ $("#modalSearchForm").val().length);
                if($("#modalSearchForm").val().length <=2 || $("#modalSearchForm").val() == ""){
                    // set the result to empty.
                     $("#navbar-search-result").html("");
                     return;
                }
                // If the value length > 3 and not empty
                if($("#modalSearchForm").val().length >2 && $("#modalSearchForm").val()){
                    // do the ajax search
                    var searchText = $("#modalSearchForm").val();
                    $.ajax({
                        url: 'http://localhost:8000/courses/ajax/',
                        method: "POST",
                        beforeSend: function() { $('#animation').addClass('loader'); },
                        complete: function() { $('#animation').removeClass('loader'); },
                        data:{
                            'search_text': searchText,
                            'csrfmiddlewaretoken': '{{csrf_token}}',
                        },
                        success: function(data){
                            // If the data length is empty, set the value to no data found
                            if(data.length <= 0 ){
                                 $("#navbar-search-result").html("No Courses found");
                                 return;
                            }
                            var links = ""
                            $.each(data, function(index, course){
                               // update the result
                                links += "<a href=/course/" + course.fields.slug + ">" + course.fields.slug+ "</a><br>";
                                 $("#navbar-search-result").html(links);
                            });
                        },
                        error: function(){
                             $("#navbar-search-result").html("Oops ! Can't found courses");
                        }
                    });
                }
            });
        })
    });