If you need a simple content refresh system, let me show you an example of a simple (yet powerful) implementation.
Step 1
Download a the lightweight ajax library from ImpliedByDesign, and copy it to a directory called “ajax” in your module directory.
Step 2
Add the following two functions to your drupal module
function printAjaxJs() {
drupal_add_js(drupal_get_path('module', 'myModule').'/ajax/ajax.js');
}
function printAjaxFunction($function,$page) {
$output.='function '.$function.'(div_id,content_id) {';
$output.='subject_id = div_id;';
$output.='content = document.getElementById(content_id).value;';
$output.='http.open("GET", "'.$page.'" + content, true);';
$output.='http.onreadystatechange = handleHttpResponse;';
$output.='http.send(null);'; $output.='}';
drupal_add_js($output,'inline');
}
Step 3
Ajaxfy your forms/pages
printAjaxJs();
$function="showContent";
printAjaxFunction($function,"/show/content/");
$script=$function."('updated-field','edit-myselect')";
$form['myForm']['mySelect'] = array(
'#type' => 'select',
'#title' => t('Formation Select'),
'#default_value' => $fdefault,
'#options' => $foptions,
'#prefix' => '',
'#suffix' => 'The output of /show/content/*value* will be updated here.',
);
Karim Vaes 