Combination of JavaScript and Select components

<?php

//Combination of Javascript and select components
//In the process of writing a program, I want to implement the option after selecting the option,
//There is no need to submit a button, but the action is sent directly, and after the action occurs
// The selected option should be kept in the page. After description, finally passed
//Use Javascript and select objects onchange properties and
//value value implements this function.
//The code is as follows (the file name is ""):


  switch ($mon){
case '': echo 'Please select your constellation: ';break;
case '1':echo 'Your sign is Aquarius';break;
case '2':echo 'Your sign is Pisces';break;
case '3':echo 'Your sign is Aries';break;
case '4':echo 'Your sign is Taurus';break;
case '5':echo 'Your sign is Gemini';break;
case '6':echo 'Your sign is Cancer'; break;
case '7':echo 'Your sign is Leo'; break;
case '8':echo 'Your sign is Virgo';break;
case '9':echo 'Your sign is a valvular';break;
case '10':echo 'Your sign is Scorpio';break;
case '11':echo 'Your sign is Sagittarius';break;
case '12':echo 'Your sign is Scorpio';break;
    default:break;
  }       
?>

<form name="form1">
  <select name="month_select"
     onChange="javascript:=
                   [].value">
<option>--Please select your zodiac sign--</option>
  <option value="?mon=1"
<?php if($mon=="1") echo " selected"; ?>>Aquarius</option>
  <option value="?mon=2"
<?php if($mon=="2") echo " selected"; ?>>Pisces</option>
  <option value="?mon=3"
<?php if($mon=="3") echo " selected"; ?>>Aries</option>
  <option value="?mon=4"
<?php if($mon=="4") echo " selected"; ?>>Taurus</option>
  <option value="?mon=5"
<?php if($mon=="5") echo " selected"; ?>>Gemini</option>
  <option value="?mon=6"
<?php if($mon=="6") echo " selected"; ?>>Cancer</option>
  <option value="?mon=7"
<?php if($mon=="7") echo " selected"; ?>>Leo</option>
  <option value="?mon=8"
<?php if($mon=="8") echo " selected"; ?>>Virgo</option>
  <option value="?mon=9"
<?php if($mon=="9") echo " selected"; ?>>Balance</option>
  <option value="?mon=10"
<?php if($mon=="10") echo " selected"; ?>>Scorpio</option>
  <option value="?mon=11"
<?php if($mon=="11") echo " selected"; ?>>Sagittarius</option>
  <option value="?mon=12"
<?php if($mon=="12") echo " selected"; ?>>Scorpion</option>
  </select>
</form>



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