.Moodle Local plugin , menu item not getting added to Site Administration - moodle

Question

I am new to moodle. I have created a local plugin setmotd.
A new menu item is not getting added to Site Administration.
Using moodle 2.8.5
In lib.php i have placed function :
function local_setmotd_extends_settings_navigation($settingsnav, $context)
{
global $CFG, $PAGE;
/*
// Only let users with the appropriate capability see this settings item.
if( ! has_capability('local_plugin/setmotd:view', $context) )
{
return;
}
*/
if($settingnode = $settingsnav->find('root', navigation_node::TYPE_SETTING))
{
$setMotdMenuLbl = get_string('menutitle', 'local_setmotd');
$setMotdUrl = new moodle_url('/local/setmotd/set_motd.php');
$setMotdnode = navigation_node::create(
$setMotdMenuLbl,
$setMotdUrl,
navigation_node::NODETYPE_LEAF);
if ($PAGE->setMotdUrl->compare($setMotdUrl, URL_MATCH_BASE)) {
$setMotdnode->make_active();
}
$settingnode->add_node($setMotdnode);
}
}
Please help.

Answer 1

I am able to add menu item.I checked in moodle/lib/navigationlib.php , class settings_navigation in method load_administration_settings, the following line :
$referencebranch = $this->add(get_string('administrationsite'), null, self::TYPE_SITE_ADMIN, null, 'root');
So, with "root", the navigation_node type has to be TYPE_SITE_ADMIN, not
TYPE_SETTING.
In firefox firebug, I had earlier noticed in the ajax call for loading site administration menu, that the css class for "root" was named TYPE_SITE_ADMIN.
Note, that I am not yet able to make the new menu item active. So notice that, that part using $PAGE, is commented.
function local_setmotd_extends_settings_navigation(settings_navigation $settingsnav, context $context)
{
global $CFG, $PAGE;
/*
// Only let users with the appropriate capability see this settings item.
if( ! has_capability('local/setmotd:view', $context) )
{
return;
}
*/
$settingnode = $settingsnav->find('root', navigation_node::TYPE_SITE_ADMIN);
if( $settingnode )
{
$setMotdMenuLbl = get_string('menutitle', 'local_setmotd');
$setMotdUrl = new moodle_url('/local/setmotd/set_motd.php');
$setMotdnode = navigation_node::create(
$setMotdMenuLbl,
$setMotdUrl,
navigation_node::NODETYPE_LEAF);
/*
if ($PAGE->$setMotdUrl->compare($setMotdUrl, URL_MATCH_BASE)) {
$setMotdnode->make_active();
}
*/
$settingnode->add_node($setMotdnode);
}
}