Created
March 3, 2012 17:15
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WordPressでちょっとだけ簡単にAjax
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<?php | |
if (!class_exists('WP_AdminAjax')): | |
class WP_AdminAjax { | |
private $nonce; | |
function __construct($action, $callback, $nopriv = false, $nonce = false) | |
{ | |
if (preg_match('/^[a-zA-Z0-9_\-]+$/', $action)) { | |
$this->action = $action; | |
} else { | |
wp_die("Invalid strings for \$action."); | |
} | |
$this->callback = $callback; | |
if ($nonce) { | |
$this->nonce = $nonce; | |
} else { | |
$this->nonce = $action; | |
} | |
add_action('wp_ajax_'.$action, array(&$this, 'wp_ajax')); | |
if ($nopriv) { | |
add_action('wp_ajax_nopriv_'.$action, array(&$this, 'wp_ajax')); | |
} | |
} | |
public function get_url($query = array()) | |
{ | |
$query['action'] = $this->action; | |
$query['nonce'] = $this->get_nonce(); | |
$url = admin_url("admin-ajax.php"); | |
foreach ($query as $key => $value) { | |
$url = add_query_arg($key, $value, $url); | |
} | |
return $url; | |
} | |
public function get_nonce() | |
{ | |
return wp_create_nonce($this->nonce); | |
} | |
public function wp_ajax() | |
{ | |
nocache_headers(); | |
if (wp_verify_nonce($_GET["nonce"], $this->nonce)) { | |
$res = call_user_func($this->callback); | |
if (is_array($res)) { | |
header('Content-Type: application/json; charset=utf-8'); | |
echo json_encode($res); | |
} else { | |
echo $res; | |
} | |
} else { | |
header('HTTP/1.1 403 Forbidden'); | |
echo '{}'; | |
} | |
exit; | |
} | |
} // end class | |
endif; | |
// EOL |
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<?php | |
// | |
// 例: | |
// wp-admin/admin-ajax.php?action=my_json&nonce=xxxxにアクセスするとjsonを出力する | |
// | |
$ajax = new WP_AdminAjax( | |
"my_json", // jsonを返すURLに使用されるパラメータ(半角英数) | |
"my_callback", // jsonを出力するためのコールバック関数 | |
true, // trueを指定するとログインしてないユーザーでもアクセス可能になる | |
"my_nonce" // デフォルトでは第一引数と同じ値が使用される。 | |
); | |
function my_callback() { | |
// | |
// いろいろな処理 | |
// | |
return array('hoge' => 'fuga', 'foo' => 'bar'); | |
} | |
// jsonを出力するためのURLを取得。jQuery.getJSON();などで使用するurlを取得できる。 | |
$url = $ajax->get_url(); | |
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