If user select None(-------) country, it must not makes ajax requests to server.

[suhailvs]

• only make ajax request if some country is selected. see pull request:

if (countryId == 0) { //Not selected
$("#id_city").html("<option value=''>---------</option>");
} else

• disable the city select while the ajax request: $("#id_city").prop('disabled',true);

• after ajax request, enable the city select: $("#id_city").removeAttr("disabled");