如果WordPress中有新帖子，如何显示通知栏？

Question

I want an alert bar at the top of my WordPress website, when there is a new post published on my blog. So the users are known that there is a new post available.

So I downloaded a WordPress plugin called: WPFront Notification Bar Only the problem is that I only can set this bar on or off. But not show this bar automatically when there is a new post and after a day it will reset the value to off and will only be switched back to on if there is a hole new post.

So I thought if I make in my header.php a notification bar like the plugin, style it to my website and add some javascript to it. Only the problem is, I don’t know how to do this and also can’t find something on the internet so the reason for this question is written above.

Answer 1

I would solve that with a little code vs a plugin.

Modify a template (of a child theme preferably) it might be page.php or header.php, depends on your theme. Add a function to functions.php to query for # of posts since whatever time you want your window to be. If posts are returned output html to create the alert bar styled to your taste; you could display the post count if you want to.

EDIT: I modified your code below. get_post_types accepts three parameters. You provided the first, the other two are optional. The third parameter $operator defaults to 'and'. You ware asking for a list of post types that are public AND are not built-in type; that will only return you CPTs. Adding the 2nd and 3rd param below asks for posts type that are public OR not built-in.

$args = array(
    'public'   => true,
    '_builtin' => false
);

$output = 'names'; // default = 'names'
$operator = 'or';  // default = 'and'

$post_types = get_post_types( $args, $output, $operator );

foreach ( $post_types as $post_type ) {

    echo '<p>' . $post_type . '</p>';

   $args = array( 'numberposts' => '1', 'post_type' => $post_type); // replace n with the number of posts
   $recent_posts = wp_get_recent_posts( $args );

   foreach( $recent_posts as $recent ){
       echo '<a href="' . get_permalink($recent["ID"]) . '" title="' . $recent["post_title"] . '" >' .   $recent["post_title"] . '</a>';
   }

}

The code above will return:

Array
    (
        [post] => post
        [page] => page
        [attachment] => attachment
        [my-cpt] => my-cpt
    )

Assuming you don't want to return pages or attachments, but just want the built-in 'post' and your custom post types you can skip the call to get_post_types and just create an array to suit your needs:

$post_types = array( 'post', 'my-cpt' );

If you don’t always know the name of CPTs (i.e. created by plugins), or you have many CPTs you can call get_post_types just as you were then add 'post' to the $post_types array.

$args = array(
    'public'   => true,
    '_builtin' => false
);
$post_types = get_post_types( $args );
$post_types['post'] = 'post';