javascript - Accessing a variable from inside a jquery drop down list? -

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i have jquery dropdown list has 2 dropdowns. first 1 list of cars , second 1 shows car's models. working fine. use selection selected user search database (mysql) , find specific element within database. gives me else within code , once gave me undefined variable error message.

can please me learn how code can access variables , display search result? here code:

this example of jquery i'm using - i'm using cars shows cities:

<select class="select" id="province" onchange="filtercity();">   <option value="1">rm</option>   <option value="2">fi</option> </select>   <select class="select" id="city" disabled>   <option data-province="rm" value="1">roma</option>   <option data-province="rm" value="2">anguillara sabazia</option>   <option data-province="fi" value="3">firenze</option>   <option data-province="fi" value="4">pontassieve</option> </select>  <span id="option-container" style="visibility: hidden; position:absolute;"></span>  <script>      function filtercity(){       var province = $("#province").find('option:selected').text(); // stores province       $("#option-container").children().appendto("#city"); // moves <option> contained in #option-container <select>       var tomove = $("#city").children("[data-province!='"+province+"']"); // selects city elements move out       tomove.appendto("#option-container"); // moves city elements in #option-container       $("#city").removeattr("disabled"); // enables select  }; </script>

and here code i'm trying access searched variable (this code echoing wrong (the else): used name="car" in second select.

if (isset($_post['car'])) {         $_session['car'] = $_post['car'];     $car = $_session['car']; } function find_tire(){     if (isset($_post['car'])) {         $_session['car'] = $_post['car'];     $car = $_session['car']; }      global $db;      if (isset($car)) {     $query = $db->prepare("select idtires vehicle idcarmodel = $car");  $query->execute();     $tire = $query->fetchall();     var_dump($query);} if (isset($tire)) {             echo "<ul>";         foreach ($tire $name) {                 echo "<li id='tiresearch'>";                 echo "tire size available: " . $name    ['idtires'];                 echo "</li>";             }echo "</ul>";     } else {              echo "wrong";         }   }

you can use ajax send variable page , response there .something 

var id = $('selector').val();     var ajaxurl = 'http://example.com';     var data = id;     $.ajax({         type: "post",         url: ajaxurl,         data: {data: data},         success: function(result) {             window.console.log('successful');         }     });

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