Javascript dropdown validation

I have this form below and I want to make sure that user choose at least on value from select. What would be JS for that

Thanks
<form name="form1" enctype="multipart/form-data" method="post" action="processfiles.php">
  <p>
  <?
  // start of dynamic form
  $uploadNeed = $_POST['uploadNeed'];
  for($x=0;$x<$uploadNeed;$x++){//3
  ?>
    <input name="uploadFile<? echo $x;?>" type="file" id="uploadFile<? echo $x;?>">
  </p>
  <?
  // end of for loop
  }//3
  ?>
  <p><input name="uploadNeed" type="hidden" value="<? echo $uploadNeed;?>">
  <p> Choose a district this file belongs to.
  <select name="district" id="districtlist">
          <option></option>
          <option value="00000000">00000000</option>
          <option value="11111111">11111111</option>
 
          <option value="9999999">9999999</option>
    </select></p>
    
    <input type="submit" name="Submit" value="Submit">
  </p>
</form>

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syedasimmeesaqAsked:
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syedasimmeesaqAuthor Commented:
ok I got it working.
Thanks
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