javascript - Mutually exclusive submits -

i have javascript on "submit" event following ajax call(which in turn triggers python script),my problem "when 1 submit event going on if else clicks on submit button ajax call should notify submission in progress" ,has ran problem?(is there name?) ,how fix problem? please suggest..

$("#main_form").submit(function(event) {        .....................              $.ajax({                 datatype: "json",                 type: "post",                 contenttype: "application/json",//note contenttype definition                 url: "scripts/cherrypick.py",                 data: json.stringify(data_cp),                 //data: data_cp,                 error : function (xhr, ajaxoptions, thrownerror){                     console.log("cherypick fail");                     console.log(response);                           console.log(response['returnarray']);                     alert(xhr.status);                     alert(thrownerror);                  },                 success: function(response){                     console.log("cherypick sucess");                     console.log(response);                     console.log(response['returnarray']);                     var return_array = response['returnarray'];                     console.log(return_array['faillist'].length);                     console.log(return_array['picklist'].length);                            (var = 0; < ip_gerrits.length; ) {                         (var j = 0; j < return_array['faillist'].length; ) {                             if (ip_gerrits[i] != return_array['faillist'][j] )                                 ipgerrits_pickuplist.push(ip_gerrits[i]);                             j++;                         }                         i++;                     } 

ok, far want synchronize requests processing users, should done on server side. assume server side python, though did not add relevant tag question. preferences c# , php, in case following ...

options # 1 - session

1) add or install preferable session module python, crowd recommends use beaker

python module session management

2) send ajax request server side script

$(form).submit(function(e) {      var options = {          url: "scripts/cherrypick.py"     };      $.ajax(options);  }); 

3) server side script have code

session_opts = {     'session.type': 'file',     'session.data_dir': './session/',     'session.auto': true, }  app = beaker.middleware.sessionmiddleware(bottle.app(), session_opts)  @hook('before_request') def setup_request():     request.session = request.environ['beaker.session']  @route('/cherrypick') def index():     if 'processing' in request.session:         data = { 'procesing': request.session['processing'] }         return data      processor()  def processor():      request.session['processing'] = 1      # processing here first request     # when processing done can clear "state" variable in session      del request.session['processing']     request.session.modified = true 

• bottle.py session beaker
• http://beaker.readthedocs.org/en/latest/sessions.html#using
• http://flask.pocoo.org/snippets/61/

4) in js script if json contains key "processing" may show alert user needs wait until first request processed

option # 2 - long polling , comet

description of option may take more space describe, better @ article, has quite nice , clean example , implementation of long polling in python

http://blog.oddbit.com/2013/11/23/long-polling-with-ja/

the main idea here not keep static session use infinite loop instead can send different http responses depending on state variable :

@route('/cherrypick') def index():      while true :          response = { 'processing': processing }         print response          if processing != 1 :             processing = 1             # processing             processing = 0          sleep(5)