How to get value from dropdown list??

I want to get a value from a drop-down menu (#city) and put it in onchange attribute of another drop-down menu (#type).

I'm try this but it can't work.

Code:

---

<div>
  <label for="city">City<label>
  <select class="form-control" id="city" name="city" onchange="getTypo(this.value)">
    <option value="">--Choose a city--</option>
    <?php
    $city = "SELECT DISTINCT `city` FROM `terrains` ORDER BY `city` ";
    $out = mysqli_query($db,$city);
    if (mysqli_num_rows($out) > 0) {
      while ($row = mysqli_fetch_assoc($out)) {
        ?><option value= <?php echo $row['city']?>><?php echo $row['city']?></option><?php
      }
    }
    ?>
  </select>
</div>
<div class="type">
  <label for="type">Type<label>

  <select class="form-control" id="type" name="type" onchange="getSTD(this.value ,'~~~??')">
    <option value="">--Choose a type--</option>

  </select>
</div>
</div>

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