การเซ็ตการเลือกของคำตัว select ให้สามารถเลือกค่าได้แล้ว สามารถขึ่นข้อความได้

<scritp language="javascript">
function fncCheck(){
 if(document.getElementById("province")[2].selected = true && document.getElementById("Comments").value == ""){
  alert("กรุณาใส่ Comments ด้วยครับ")
  document.getElementById("Comments").focus();
}
else{
  document.form.method="post";
  document.form.action="filename";
  document.form.submit();
}

}

</script>

<select name="level" id="province" class="select-list" >
            <option value="5-พอใจมากที่สุด">5-พอใจมากที่สุด</option>
            <option value="4-พอใจมาก">4-พอใจมาก</option>
            <option onclick="Evaluation.php?menu=showmsg" value="3-พอใจปานกลาง">3-พอใจปานกลาง</option>
     		<option value="2-พอใจน้อย">2-พอใจน้อย</option>
			<option value="1-พอใจน้อยมาก">1-พอใจน้อยมาก</option>
            </select>
<br />
     <input type="text" name="Comments" id="Comments">

<input type="button" value="GO" onclick="fncCheck();";>

  <script language='javascript'>
  function enable_other(){
     var sel = document.getElementById('sel_work').options[document.getElementById('sel_work').selectedIndex].value;
     if(sel == 1){
       document.getElementById('one').style.display="inline"; 
       document.getElementById('two').style.display="none";
       document.getElementById('three').style.display="none";
       document.getElementById('four').style.display="none";
       document.getElementById('five').style.display="none";
     }else if(sel == 2){
       document.getElementById('two').style.display="inline";
      document.getElementById('one').style.display="none"; 
      document.getElementById('three').style.display="none";
       document.getElementById('four').style.display="none";
       document.getElementById('five').style.display="none";
     }else if(sel == 3){
       document.getElementById('three').style.display="inline";
      document.getElementById('one').style.display="none"; 
      document.getElementById('two').style.display="none";
       document.getElementById('four').style.display="none";
       document.getElementById('five').style.display="none";
     }else if(sel == 4){
       document.getElementById('four').style.display="inline";
      document.getElementById('one').style.display="none"; 
      document.getElementById('two').style.display="none";
       document.getElementById('three').style.display="none";
       document.getElementById('five').style.display="none";
     }else if(sel == 5){
       document.getElementById('five').style.display="inline";
      document.getElementById('one').style.display="none"; 
      document.getElementById('two').style.display="none";
       document.getElementById('three').style.display="none";
       document.getElementById('four').style.display="none";
     }else{
       document.getElementById('one').style.display="none"; 
       document.getElementById('two').style.display="none";
       document.getElementById('three').style.display="none";
       document.getElementById('four').style.display="none";
       document.getElementById('five').style.display="none";
     }
	}
</script>


<select id='sel_work' name='sel_work' onchange='enable_other();'>
  <option value='0'>สำรวจความคิดเห็น</option>
  <option value='1'>1</option>
  <option value='2'>2</option>
  <option value='3'>3</option>
  <option value='4'>4</option>
  <option value='5'>5</option>
</select>

<div id='one' style='display:none;'>
     1-พอใจน้อยมาก
</div>
<div id='two' style='display:none;'>
	2-พอใจน้อย
</div>
<div id='three' style='display:none;'>
	3-พอใจปานกลาง
</div>
<div id='four' style='display:none;'>
	4-พอใจมาก
</div>
<div id='five' style='display:none;'>
	5-พอใจมากที่สุด</
</div>