Resolve problem with form submission

The problem was simple... an error in selector, and need to ensure only one <option> is selected at any one time,

by alano

HTML

<fieldset>

        
<div class="type-text">

  <label for="date_from">Date1:</label>
  <input type="text" size="20" id="date_from" name="rent-a-car[date_from]" value="" readonly="readonly" />
</div>

         
<div class="type-select">

    <label for="time_from_hour">Hour1: </label>
    <select id="time_from_hour" name="rent-a-car[time_from_hour]" class="select">
        <option value="">---</option>
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
        <option value="8">8</option>
        <option value="9">9</option>
        <option value="10">10</option>
        <option value="11">11</option>
        <option value="12">12</option>
        <option value="13">13</option>
        <option value="14">14</option>
        <option value="15">15</option>
        <option value="16">16</option>
        <option value="17">17</option>
        <option value="18">18</option>
        <option value="19">19</option>
        <option value="20">20</option>
        <option value="21">21</option>
        <option value="22">22</option>
        <option value="23">23</option>
    </select>
    <span> : </span>
  
    <label for="time_from_minute" style="display: none;">minute1: </label>
    <select id="time_from_minute" name="rent-a-car[time_from_minute]" class="select">
        <option value="">---</option>
        <option value="00">00</option>
        <option value="15">15</option>
        <option value="30">30</option>
        <option value="45">45</option>
    </select>

</div>

<div class="type-select">
   
    <label for="get_car">City1:</label>
    <select id="get_car" name="rent-a-car[get_car]" class="select">
        <option value="">---</option>
        <option value="Katowice">Katowice</option>
        <option value="Kraków">Kraków</option>
        <option...

JavaScript

$(function() {

    $( "#date_from, #date_to" ).datepicker({
        defaultDate: "+1d",
        minDate: "+1d",
        changeMonth: true,
        changeYear: true,
        dateFormat: "dd/mm/yy",
        monthNamesShort: ["Sty","Lut","Mar","Kwi","Maj","Cze","Lip","Sie","Wrz","Paz","Lis","Gru"],
        dayNamesMin: ["Nie", "Pon", "Wt", "Śr", "Czw", "Pt", "Sob"],
        numberOfMonths: 1,
        onSelect: function( selectedDate ) {
            if(this.id == 'date_from'){
              var dateMin = $('#date_from').datepicker("getDate");
              var dateMax = $('#date_to').datepicker('getDate');
              var rent_date_from = new Date(dateMin.getFullYear(), dateMin.getMonth(),dateMin.getDate() + 1); 
              var rent_date_to = new Date(dateMin.getFullYear(), dateMin.getMonth(),dateMin.getDate() + 29); 
              $('#date_to').datepicker("option","minDate",rent_date_from);
              $('#date_to').datepicker("option","maxDate",rent_date_to);      
            }
            compute(); //Add compute
        }

    });   

    $.viewMap_get = {
        '0' : $([]),
        'Katowice' : $('#c1a, #c1b, #c6, #c7'),
        'Kraków' : $('#c2a, #c2b, #c6, #c7'),
        'Warszawa' : $('#c3a, #c3b, #c6, #c7'),
        'Wrocław' : $('#c4a, #c4b, #c6, #c7'),
        'Gdańsk' : $('#c5a, #c5b, #c6, #c7'),
    };
    
    $.each($.viewMap_get, function() { this.hide(); });
    $('#get_city_district').hide();
    
    $('#get_car').on('change', function() {
    // hide all
    $.each($.viewMap_get, function() { this.hide(); });
      $('#get_city_district').hide();
    // show current
    $.viewMap_get[$(this).val()].show();
      $('#get_city_district').show();
         
      var id = $.viewMap_get[$(this).val()].attr("id");   
      $('#'+id).attr('selected', 'selected');
    });
    
    $.viewMap_return = {
        '0' : $([]),
        'Katowice' : $('#d1a, #d1b, #d7'),
        'Kraków' : $('#d2a, #d2b, #d7'),
        'Warszawa' : $('#d3a, #d3b,...