Checking for Java Enabled Browser with PHP

This does not actually check for java on the machine. It just checks to see if the browser has java on or off. PHP cannot do this alone being a server-side language so you need to implement this using javascript under PHP.

You also have to be a little bit clever and set the script up so that the output is placed in a javascript variable that is readily available to PHP.

<?php

$output .= '
    <script language="JavaScript">
      var haveJava = navigator.javaEnabled();
      document.write("<br>Is Java is enabled ? : " + haveJava);
    </script>';

?>

I needed both a check for javascript and one for java. I managed to do this by using javascripts redirect and a built in javascript check for java enabled browsers. The following is a Drupal function but can be moded to suit any other PHP need.

<?php

function jupload_start(){
    global $user, $base_url;
    $output = '
    <script type="text/javascript">
      var haveJava = navigator.javaEnabled();
      if (haveJava) {
          document.write(" Java and javascript check are okay");
          window.location.href = "'.$base_url.'/?q=jupload/view&java=yes"; 
      }
      else {
          window.location.href = "'.$base_url.'/?q=jupload/start&java=no";
      }
      </script>';
      $output .= '<noscript> Your browser must have javascript enabled.</noscript>';
      print theme('page', $output); 
  }
?>

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