Created
December 6, 2010 16:16
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jQuery Post Loader for WordPress Home Page
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| <?php | |
| /* | |
| Plugin Name: mfields.org - Ajax Append Posts | |
| Plugin URI: | |
| Description: | |
| Version: 0.1.1 | |
| Author: Michael Fields | |
| Author URI: http://mfields.org/ | |
| Copyright 2010 Michael Fields michael@mfields.org | |
| License GPLv2 | |
| */ | |
| /** | |
| * Ensure that jQuery is included on the homepage. | |
| */ | |
| function mfields_ajax_append_posts_jquery() { | |
| if ( is_home() ) { | |
| wp_enqueue_script( 'jquery' ); | |
| } | |
| } | |
| add_action( 'wp_print_scripts', 'mfields_ajax_append_posts_jquery' ); | |
| function mfields_ajax_append_posts_button( $format = "%d more posts." ) { | |
| $posts_remaining = (int) $GLOBALS['wp_query']->found_posts = $GLOBALS['wp_query']->post_count; | |
| $text = sprintf( $format, $posts_remaining ); | |
| print '<div id="load-posts">' . $text . '</div>'; | |
| pr( $GLOBALS['wp_query'] ); | |
| } | |
| add_action( 'mfields_ajax_append_posts_button', 'mfields_ajax_append_posts_button' ); | |
| /** | |
| * Ajax callback. | |
| * | |
| * @return void. | |
| * | |
| * @todo check indexes. | |
| * @todo move to admin-ajax.php??? | |
| * | |
| * @since 2010-12-06 | |
| */ | |
| function mfields_ajax_append_posts_query() { | |
| if ( ! is_admin() && isset( $_GET['action'] ) && 'mfields_load_posts' === $_GET['action'] ) { | |
| $response = array(); | |
| global $query_string; | |
| query_posts( $query_string . '&paged=' . $_GET['paged'] ); | |
| $response['post_count'] = (int) $GLOBALS['wp_query']->post_count; | |
| if( have_posts() ) { | |
| ob_start(); | |
| while( have_posts() ) { | |
| the_post(); | |
| the_title( '<h2>', '</h2>' ); | |
| the_content(); | |
| } | |
| $response['html'] = ob_get_contents(); | |
| ob_end_clean(); | |
| } | |
| else { | |
| $response['html'] = 'none'; | |
| } | |
| print json_encode( $response ); | |
| exit; | |
| } | |
| } | |
| add_action( 'init', 'mfields_ajax_append_posts_query' ); | |
| /** | |
| * Print javascript to the footer. | |
| * | |
| * @return void. | |
| * | |
| * @todo fine-tune javascript. | |
| * @todo minify javascript. | |
| * | |
| * @since 2010-12-06 | |
| */ | |
| function mfields_ajax_append_posts_js() { | |
| if ( is_home() ) { | |
| global $wp_query; | |
| $found_posts = 0; | |
| if ( isset( $wp_query->found_posts ) ) { | |
| $found_posts = $wp_query->found_posts; | |
| } | |
| print <<< EOF | |
| <script type="text/javascript"> | |
| jQuery( document ).ready( function( $ ) { | |
| var next_page = 2; | |
| var total_posts = {$found_posts}; | |
| var posts_in_dom = $( '#content .hentry' ).length; | |
| var posts_remaining = total_posts - posts_in_dom; | |
| var button = $( '#load-posts' ); | |
| var container = $( '#content' ); | |
| button.click( function () { | |
| append_posts(); | |
| } ); | |
| function append_posts() { | |
| $.ajax( { | |
| url : document.location.href, | |
| data : { 'action' : 'mfields_load_posts', 'paged' : next_page }, | |
| type : 'GET', | |
| dataType : 'json', | |
| cache : false, | |
| success : function( response ) { | |
| if ( 0 === response.post_count ) { | |
| button.remove(); | |
| } | |
| else { | |
| container.append( response.html ); | |
| posts_in_dom = posts_in_dom + parseInt( response.post_count ); | |
| posts_remaining = total_posts - posts_in_dom; | |
| if ( 0 === posts_remaining ) { | |
| button.remove(); | |
| } | |
| else { | |
| button.append( posts_remaining ); | |
| next_page++; | |
| } | |
| } | |
| } | |
| } ); | |
| }; | |
| }); | |
| </script> | |
| EOF; | |
| } | |
| } | |
| add_action( 'wp_footer', 'mfields_ajax_append_posts_js' ); |
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