on Change of dropdown list showld call the php function

Question

On change of the dropdown list, A php function should called.

Inside the PHP function I will do some calculation. Later I need to set the value of a text box or else

Answer 1

You can't call a php function from js or html, but you can do that by ajax call to a php function where you can perform your calculation and then return the result value to js, so then you can do by js to html...

Update:

<select name="employee" id="employee" onchange="getIPL(this.value);">
   <option value="">Select Employee</option>
</select>    

function getIPL(id)
    {
            $.ajax({
                       type: "GET",
                       url: "EmpLeave.php",
                       data: "emp_Id =" + id,
                       success: function(result){
                         $("#somewhere").html(result);
                       }
                     });
    };


 // Empleave.php file....
  if(isset($_GET['emp_Id'])){
     GetTotalPL($_GET['emp_Id']);
 }

 function GetTotalPL($id){
  // do your calculation...
}

Answer 2

Insert your function in a php file to excute , then you could call php file with ajax ( i suggest u use jQuery )

///////////////////////// foo.php

<?php

Function foo (){

// Your process

}

foo();

?>

///////////////////// text.html

<select name="test" id="test" >
<option>.....</option>
.
.
.
.
</select>
<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js'></script>
<script type="text/javascript">
$('#test').change(function(){
$.ajax({
    type: "GET",
        url: "foo.php",
        success:function(){
        // Your function after execute foo.php

        }
            })

})
</script>