dynamically passing href in anchor tag

i want to redirect user to registration based on there role. like there is two roles user and shop if user select user role then it will be directed to the ragic.php(registration customer) if selected shop then ragis.php Hear is the code…

 Link: `<td colspan=3 align="center"><font size=6 ><a onclick="return check_role()" href="" id="ref" name="Ragistration">Ragistration</a>`

Selecting Role: 

<select id="role" name="role">
                        <option value="ragic.php">user</option>
                        <option value="shop/ragis.php">shop</option>
                    </select>
Java Script Function :

 function check_role()
            {
                    var r=document.getElementById('role').value;
                    alert(r);
                    document.getElementById("ref").value = test;                    
            }

one problem is how i pass a javascript variable into anchor href. or i also try for php hear is code

  if(@isset($Ragistration))
{
    if(@$role=="shop")
    $r="shop/ragis.php";
elseif(@$role=="user")
    $r="ragic.php";

}

and for php anchor tag will be <a href="<?php echo $r?>" ></a>

Answer

Update your JavaScript function like this:

function check_role()
{
  var r=document.getElementById('role').value;
  alert(r);
  location.href = r;
}

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Answer