Question

Possible Duplicate:
Pass a PHP string to a Javascript variable (including escaping newlines)

Let’s say there is some PHP file called as scheduler.php. It contains a script

<script>
window.setInterval(function(){
    find_opt_schedule();
}, 60000);
</script>

… and some PHP code:

<form action="scheduler.php" method="post">
    <select name="refresh" id="refresh">
            <option value="30000">30000</option>
            <option value="60000" selected>60000</option>
            <option value="120000">120000</option>
    </select>
</form>

How do I use the value selected by the user from refresh select list inside the script? In particular, I want to replace 60000 by the variable that must be selected by the user from the list. I tried this, but the refresh rate is very high instead of 60000 miliseconds.

window.setInterval(function(){
    find_opt_schedule();
    alert(<?php echo (int)$_POST['refresh']; ?>);
}, <?php echo (int)$_POST['refresh']; ?>);

Answer 1

<select name="refresh" id="refresh">
    <option value="30000">30000</option>
    <option value="60000" selected>60000</option>
    <option value="120000">120000</option>
</select>   


window.setInterval(function(){
    find_opt_schedule();
}, <?php echo (int)$_POST['refresh']; ?>);

And make sure you use:

<form action="yourscript.php" method="post" name="form" id="form">

And a submitbutton, or javascript:

<select name="refresh" id="refresh" onchange="form.submit()">

<input type="submit" value="Set refresh"/>

All together, with session storage:

<?php 
 session_start();
 if( isset( $_POST['refresh']) ){
   $_SESSION['refresh'] = (int) $_POST['refresh'];
 }
 ?>

<script type="text/javascript">
 window.setInterval(function(){
    find_opt_schedule();
}, <?php echo isset($_SESSION['refresh'])?$_SESSION['refresh']:120000; ?>);
</script>

<form action="scheduler.php" method="post" name="form" id="form">
  <select name="refresh" id="refresh" onchange="form.submit()">
    <option value="30000">30000</option>
    <option value="60000" selected="selected">60000</option>
    <option value="120000">120000</option>
 </select>  
 <input type="submit" value="Set refresh"/>
</form>