Updates any Task model without reloading using ajax

task_update_json.html

#views.py

class TaskUpdateView(generic.UpdateView):
    model = Task
    form_class = TaskForm

    @json_view
    def dispatch(self, *args, **kwargs):
        return super(TaskUpdateView, self).dispatch(*args, **kwargs)
    
    def form_valid(self, form):
        form.save()
        return {'success': True}
    
    def form_invalid(self, form):
        form_html = render_crispy_form(form)
        return {'success': False, 'form_html': form_html}
    
    def get(self, request, *args, **kwargs):
        object = super(TaskUpdateView, self).get_object()
        form_html = render_crispy_form(TaskForm(instance=object))
        context = {'form_html': form_html}
        return context

class TaskListUpdateView(generic.ListView):
    model = Task
    template_name = 'tasks/task_update_json.html'


#task_update_json.html


{% block content %}

    <h1>Tasks</h1>



        <select class="select" id="task_selector" name="task_selector">
            <option value="" selected="selected">---------</option>
            {% for task in task_list %}
                <option value="{{ task.id }}" id="task-option-{{ task.id }}">{{ task.title }}</option>
            {% endfor %}
        </select>

    <div id="task-form"></div>

{% endblock %}

{% block extra_js %}
    <script>
    var taskSelector = $('#task_selector');
    var update_url = "/cpm/tasks/update/";
    var taskId = $(taskSelector).val();
    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 getTaskForm(t_id) {
        $.getJSON(update_url + t_id + '/', function (data) {
            $('#task-form').replaceWith(data['form_html']);
        }).done(function() {
                    submitAjax($("#submit-id-save_task"));
                });
    }
    taskSelector.change(function() {
        taskId = $(taskSelector).val();
        getTaskForm(taskId);
    });

    function submitAjax(button) {
    $(button).click(function(e) {
        e.preventDefault();
        console.log($('#task-form').serialize());
        var task_form_title = $('#task-form').find('#id_title').val();
        $.ajax({
            url: update_url + taskId + '/',
            type: "POST",
            data: $('#task-form').serialize() + '&csrfmiddlewaretoken=' + getCookie('csrftoken'),
            success: function(data) {
                if (!(data['success'])) {
                    $('#task-form').replaceWith(data['form_html']);
                }
                else {
                    $('#task-option-' + taskId).text(task_form_title);
                    $('.error').removeClass('error');
                    $('.help-block').hide();
                }
            },
            error: function () {
            }
        }).done(function() {
            submitAjax($("#submit-id-save_task"));
        });
        return false;
    });
    }

    </script>
{% endblock extra_js %}