javascript - Handling async ajax calls within django session -

i have django application, template contains loop in javascript, iterates of check-boxes in table. each check box, send ajax request view function, want save id of check box in list or remove id list (depends on check state). need list part of request.session dictionary. results show me ajax calls asynchronous , makes list wrongly updated, , inconsistent. there thread safe data structures can store part of session, , ensure sync list updating?

javascript , ajax:

function checkall(source, type) {             checkboxes = document.getelementsbyname(type);             for(var i=0, n=checkboxes.length;i<n;i++) {                 if (checkboxes[i].checked != source.checked) {                     checkboxes[i].checked = source.checked;                     select_row(checkboxes[i], source.checked);                 }             }         }  function select_row(row_selector, is_checked) {             is_box_checked = typeof is_checked !== 'undefined' ? is_checked : row_selector.checked;             request = {                 url: "{% url 'set_check_box' %}",                 type: "post",                 contenttype: "application/x-www-form-urlencoded",                 data: {                     csrfmiddlewaretoken: "{{ csrf_token }}",                     checked: is_box_checked,                     check_box_id: row_selector.id,                     type: row_selector.name                 },                 error: function(response, status, error_msg) {                     console.log(error_msg);                 }             };             $.ajax(request);         } 

view function:

def set_check_box(request):     request.session.modified = true     check_box_list = list(request.session['connects_check_boxes_id_list'])     check_box_id = request.post["check_box_id"]     is_checked = json.loads(request.post['checked'])     if is_checked:         check_box_list.append(check_box_id)     else:         check_box_list.remove(check_box_id)     request.session['connects_check_boxes_id_list'] = list(check_box_list) return httpresponse("") 

all had set async option false part of request parameters.

function select_row(row_selector, is_checked) {             is_box_checked = typeof is_checked !== 'undefined' ? is_checked : row_selector.checked;             request = {                 url: "{% url 'set_check_box' %}",                 type: "post",                 contenttype: "application/x-www-form-urlencoded",                 async: false,                 data: {                     csrfmiddlewaretoken: "{{ csrf_token }}",                     checked: is_box_checked,                     check_box_id: row_selector.id,                     type: row_selector.name                 },                 error: function(response, status, error_msg) {                     console.log(error_msg);                 }             };             $.ajax(request);         }