无按钮从html选择提交，但使用href而不是值？

I don't want a button to submit the information from my dropdown list, so I think onchange would be the best way to submit it instead. But I don't know how to implement that when I'm using href and not value. Is there a way to do this?

I have this for the html:

    <a href='index.php'>Home </a>|
    <a href='index.php?mode=customers'>List of Customers </a>|
    <a href='index.php?mode=movieList&genre=Drama'>Drama Movies </a>|
    <a href='index.php?mode=movieList&genre=Adventure'>Adventure Movies </a>|
    <select>
            <option disabled selected>Popular Movies</option>
            <option><a href='index.php?mode=favoriteGenre&genre=Adventure'>Adventure</a>
            <option><a href='index.php?mode=favoriteGenre&genre=Romance'>Romance</a>
            <option><a href='index.php?mode=favoriteGenre&genre=Drama'>Drama</a>
            <option><a href='index.php?mode=favoriteGenre&genre=Comedy'>Comedy</a>
            <option><a href='index.php?mode=favoriteGenre&genre=Sci-Fi'>Sci-Fi</a>
    </select>

and then the corresponding php for just the dropdown:

case "favoriteGenre" :

      $genre = (isset($_GET['genre'])) ? $_GET['genre'] : -1;
      // step 1: Define SQL Statement
      $sql = "SELECT first_name, last_name, title, `movies`.type, date_out FROM `movies`,`customers` WHERE `movies`.type='".$genre."'";
      // obtain data
      $movieInfo = getAll($sql);
      // define column labels
      $movie_labels = array('First Name', 'Last Name', 'Title', 'Genre', 'Date Out');
      echo "All instances of rental where the genre is " . $genre . ":";
      // display data
      displayTable($movieInfo, $movie_labels);
      break;

And if this question is answered elsewhere, please just point me in the right direction. I haven't been able to find it anywhere thus far. Thanks!

Instead of keeping links inside options, assign values to options like this -

    <a href='index.php'>Home |</a>
<a href='index.php?mode=customers'>List of Customers |</a>
<a href='index.php?mode=movieList&genre=Drama'>Drama Movies |</a>
<a href='index.php?mode=movieList&genre=Adventure'>Adventure Movies |</a>
<select id="movieOptions">
        <option disabled selected>Popular Movies</option>
        <option value="mode=favoriteGenre&genre=Adventure">Adventure</option>
        <option value="mode=favoriteGenre&genre=Romance">Romance</option>
        <option value="mode=favoriteGenre&genre=Drama">Drama</option>
        <option value="mode=favoriteGenre&genre=Comedy">Comedy</option>
        <option value="mode=favoriteGenre&genre=Sci-Fi">Sci-Fi</option>
</select>

<script>
    $("#movieOptions").change(function () {
        var goTo = this.value;
        console.log(goTo);
        window.location.href = "index.php?" + goTo;
    });
</script>