<select class="form-control choose-doc" name="doc_type[0][1]">
<option selected="selected" hidden="hidden" value="">Choose document</option
<option value="Driver's license">Driver's license</option>
<option value="Passport">Passport</option>
</select>

$(document).on('change', 'select[class*="choose-doc"]', function () {
    var value = $(this).val();
    ....
    if (value == 'Passport') {
    $('input[name='doc_number[x][y]").attr('readonly', 'readonly).attr..... // do something.
    send_ajax_request_and_insert_return_function(); - // send ajax-request and insert response.

... for (var property in documents) {
if(documents.hasOwnProperty(property) {

   var name = $('name="'+property+'"]');

   if(documents.property == "Passport") {

    name.val(documents[property]).change();

"name.val(documents[property]).change();"

send_ajax_request_and_insert_return_function();