Select from combobox press ok and the save it

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Javascript

PHP

server

<select name="s1">
      <option value="" selected="selected">-----</option>
  <?php 
       foreach(glob(dirname(__FILE__) . '/txt/*') as $filename){
       $filename = basename($filename);
       echo "<option value='" . $filename . "'>".$filename."</option>";
    }
	

?>

</select>


	
<form action="save_selected.php" method="post">
    <input type="submit" name="myfile" value="ok" />
</form>

<?php
var name = document.getElementById("myText").value;
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt =  $filename;
fwrite($myfile, $txt);

fclose($myfile);
?>

What I have tried:

Right now It just save right away. Then I tried to split up the code into 2 files. How can the button detect the selected file into a var! and then read the save code?

Is it possible to keep all code in one file, and use a loop. First read the files into combobox (stop code) press OK, (start code "save")?