My Monkey Do

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wordpress

Disable Responsive Images in WordPress

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In WordPress 4.4 images are displayed with the srcset attribute.  This attribute allows the browser to select alternative images for best viewing.  Sometimes though this may not be wanted as the image being displayed is the only image you want to show for all users.

To not have any srcset images, use the following:

add_filter( ‘wp_calculate_image_srcset_meta’, ‘__return_null’ );

For other filters new to WordPress 4.4, you can visit the blog post:

Responsive Images in WordPress 4.4

 

One user had a problem with the images in the srcset not having the https protocol and causing security warnings.  This stack overflow post resolves that:

http://wordpress.stackexchange.com/questions/211375/how-do-i-disable-responsive-images-in-wp-4-4

 

Run WP-Cron with no visitors

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Got a website with noone visits or simply a website that is private but still need WP-Cron to be run?  no problem, you have 2 easy options.

1) Setup a free account with set https://www.setcronjob.com ( i like them better because they enable email notifications on the free account).   Create a cron job to visit wp-cron.php on your domain.

2) set up a scheduled task or cron job on your computer.  Mac OS X and Windows PC.  Problem with this though is your computer needs to be on with internet access, and if you ever buy another computer (and don’t turn your current one on) this job will never run:

https://developer.wordpress.org/plugins/cron/hooking-into-the-system-task-scheduler/

Order Non-hierarchical Custom Post Types

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Non-hierarchical post types are like regular posts which normally do not have a menu_order attribute.  Hierarchical post type are like pages which allows a parent/child and is normally ordered by the menu_order attribute.  What if you have a custom post type that shouldn’t have a parent/child, but you still want to order it by something other than the post date?  This code does the trick on the admin side.

https://wordpress.org/support/topic/sorting-by-menu_order-in-admin-screen-on-non-hierarchical-custom-post-types

WordPress Heartbeat API

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I could not find any extensive documentation on the WordPress Heartbeat API, so I am writing here to remember what I have learned through various tutorials throughout the web.

The Heartbeat API is written in Javascript.  Think of it like a javascript function that gets run every 60 seconds (depending on the interval) which sends data via POST to the server and then the server returns a response.  All of which you can easily hook into.  It was introduced in WordPress 3.6.

Quick Examples

PHP


// server received whatever parameters from when javascript triggered the "heartbeat-send" event.
function myplugin_heartbeat_received( $response, $data ) {
if ( !empty( $data['myplugin_id'] ) ) {
$response['myplugin_got_it'] = true;
}
return $response;
}
add_filter( 'heartbeat_received', 'myplugin_heartbeat_received', 10, 2 );

Javascript


jQuery(document).ready(function($) {
wp.heartbeat.interval= 15;
// set some parameters when it's time to send data to the server
$(document).on('heartbeat-send.myplugin', function(e, data){
data['myplugin_id'] = my_id;
});

// do something when your page gets a response.
$(document).on('heartbeat-tick.myplugin', function(e, data){

if ( data.hasOwnProperty( 'myplugin_got_it' ) ) {
refreshPage();
}
});

});

Heartbeat Pulse Interval

The ‘heartbeat_settings’ filter gets applied in the ‘init’ hook, priority 0 in wp_default_scripts in wp-includes/script-loader.php.  So if you do use the hook on the server-side and want to only run it on certain pages, be prepared to parse the URL because a lot of WP functions aren’t available at that time.  Alternatively you can set the interval in javascript with wp.heartbeat.interval(15) where 15 is seconds.  Note some other tutorials say to use ‘fast’, ‘standard’, ‘slow’, but that didn’t work for me for some reason.

 

Tutorials

I found these tutorials to be the most helpful.

http://code.tutsplus.com/tutorials/the-heartbeat-api-getting-started–wp-32446

http://code.tutsplus.com/tutorials/the-heartbeat-api-changing-the-pulse–wp-32462

http://code.tutsplus.com/tutorials/heartbeat-api-using-heartbeat-in-a-plugin–wp-32496

 

edit_users capability on multisite

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No matter how hard you try, if you add the edit_user capability to a user on multi-site and that user is not a super-admin, the user will not have the edit_user capability.  This is hard-coded into WP_User’s map_meta_cap.  There is a filter so after it’s all done, you can search for it and take it out if you want.