Wordpress Ajax

ajax-cached.php

<?php

add_action('wp_ajax_myajaxfunctionname', 'ajax_myajaxfunctionname');
add_action('wp_ajax_nopriv_myajaxfunctionname', 'ajax_myajaxfunctionname');

function ajax_myajaxfunctionname(){

    $var = $_POST['var'];
    if( ! isset($var) ) die(1);
    
    // try to supply from cache
    $page_from_cache = get_option( "cache_id{$var}", 0 );
    if($page_from_cache){
        die($page_from_cache);
    }

    ob_start(); // start collecting for cache

    // echo stuff, wp_query, whatever

    // save to cache
    update_option( "cache_id{$var}", ob_get_flush() );

    die();
}

?>

ajax-simple.php

<?php

add_action('wp_ajax_myajaxfunctionname', 'ajax_myajaxfunctionname');
add_action('wp_ajax_nopriv_myajaxfunctionname', 'ajax_myajaxfunctionname');

function ajax_myajaxfunctionname(){

	$var = $_POST['var'];
	if( ! isset($var) ) exit(1);

	// echo stuff, wp_query, whatever you want

	exit;

}

?>

ajax.js

$.post(
  ajax_params.ajax_url,
  {
    action: 'myajaxfunctionname',
    var: 'asdf' // vars here are accessible using $_POST
  },
  function( responseHTML ){
    $('body').append( responseHTML )
  }
)

functions.php

<?php

// piggyback AJAX url via register_script

wp_register_script( 'theme-ajax-js', get_bloginfo('template_url').'/js/main.js', array('jquery'), '', true );

wp_localize_script( 'theme-ajax-js', 'ajax_params', array( 'ajax_url' => admin_url('admin-ajax.php') ) );
wp_enqueue_script( 'theme-ajax-js' );
    
?>

invalidate-cache.php

<?php

if( ! function_exists('va_invalidate_year_archive_ajax_cache') ) :
	function va_invalidate_year_archive_ajax_cache( $post_id ){
	    
	    delete_option('cache_id{$var}');
	}
endif;

add_action('save_post', 'va_invalidate_year_archive_ajax_cache');
add_action('save_post_customposttype', 'va_invalidate_year_archive_ajax_cache');

?>

Caching Ajax requests in Wordpress