WordPress Plugins 101 Agenda

agenda.md

Agenda

Intro

• Dial people in
• Does anyone have any issues with WAMP or WordPress running locally?
• Any other important things to discuss?

Main Event

• The anatomy of a plugin.
• Creating a barebones plugin that does one thing, like insert a banner, or CSS or JS ref into the page, or something like that
• Creating an admin form for your plugin.
• A look at a more complex example.

jbubriski-add-jquery.php

<?php
/*
        Plugin Name: Jbubriski Add jQuery
        Plugin URI: http://johnnycode.com
        Description: Adds jQuery
        Author: John Bubriski
        Version: 0.1
        Author URI: http://johnnycode.com
        Text Domain: jbubriski-add-jquery
        Domain Path: /lang
 */

function jbubriski_add_jQuery()
{
        if (!is_admin())
        {
                wp_enqueue_script('jQuery-2.0.3', '//ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js', array(), '3', true);
        }
}

add_action('wp_head', 'jbubriski_add_jQuery');

jbubriski-shorty.php

<?php
/*
  Plugin Name: Jbubriski Add Caption Shortcode
  Plugin URI: http://johnnycode.com
  Description: Adds a caption shortcode
  Author: John Bubriski
  Version: 0.1
  Author URI: http://johnnycode.com
  Text Domain: jbubriski-add-shortcode
  Domain Path: /lang
 */

function caption_shortcode($atts, $content = null)
{
   return '<span class="caption">' . $content . '</span>';
}

add_shortcode('caption', 'caption_shortcode');

johnny-code-head-code.php

<?php
/*
        Plugin Name: Johnny Code's head code
        Plugin URI: http://johnnycode.com
        Description: Adds code to the &lt;head&gt; section of the page.
        Author: John Bubriski
        Version: 0.1
        Author URI: http://johnnycode.com
        Text Domain: johnny-code-head-code
        Domain Path: /lang
 */

function register_head_setting()
{
        register_setting('general', 'jc_head-code');

        add_settings_section('jc_head-code-section', 'Johnny Code Head Code', '__return_false', 'general');
        add_settings_field('jc_head-code', 'Head Code HTML', 'jc_setting_callback_function', 'general', 'jc_head-code-section');
}

function jc_head_code()
{
        if (!is_admin())
        {
                $head_code = get_option('jc_head-code');

                echo $head_code;
        }
}

function jc_setting_callback_function($args)
{
        $head_code = html_entity_decode(get_option( 'jc_head-code'));
        echo "<textarea name='jc_head-code' rows='12' cols='80'>$head_code</textarea>";
}

add_action('admin_init', 'register_head_setting');
add_action('wp_head', 'jc_head_code');