112 lines
3.2 KiB
PHP
112 lines
3.2 KiB
PHP
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<?php
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/**
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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App::uses('View', 'View');
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/**
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* A view class that is used for JSON responses.
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*
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* By setting the '_serialize' key in your controller, you can specify a view variable
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* that should be serialized to JSON and used as the response for the request.
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* This allows you to omit views + layouts, if your just need to emit a single view
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* variable as the JSON response.
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*
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* In your controller, you could do the following:
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*
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* `$this->set(array('posts' => $posts, '_serialize' => 'posts'));`
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*
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* When the view is rendered, the `$posts` view variable will be serialized
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* into JSON.
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*
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* You can also define `'_serialize'` as an array. This will create a top level object containing
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* all the named view variables:
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*
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* {{{
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* $this->set(compact('posts', 'users', 'stuff'));
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* $this->set('_serialize', array('posts', 'users'));
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* }}}
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*
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* The above would generate a JSON object that looks like:
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*
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* `{"posts": [...], "users": [...]}`
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*
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* If you don't use the `_serialize` key, you will need a view. You can use extended
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* views to provide layout like functionality.
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*
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* @package Cake.View
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* @since CakePHP(tm) v 2.1.0
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*/
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class JsonView extends View {
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/**
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* JSON views are always located in the 'json' sub directory for a
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* controllers views.
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*
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* @var string
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*/
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public $subDir = 'json';
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/**
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* Constructor
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*
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* @param Controller $controller
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*/
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public function __construct(Controller $controller = null) {
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parent::__construct($controller);
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if (isset($controller->response) && $controller->response instanceof CakeResponse) {
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$controller->response->type('json');
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}
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}
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/**
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* Render a JSON view.
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*
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* Uses the special '_serialize' parameter to convert a set of
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* view variables into a JSON response. Makes generating simple
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* JSON responses very easy. You can omit the '_serialize' parameter,
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* and use a normal view + layout as well.
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*
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* @param string $view The view being rendered.
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* @param string $layout The layout being rendered.
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* @return string The rendered view.
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*/
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public function render($view = null, $layout = null) {
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if (isset($this->viewVars['_serialize'])) {
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return $this->_serialize($this->viewVars['_serialize']);
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}
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if ($view !== false && $this->_getViewFileName($view)) {
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return parent::render($view, false);
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}
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}
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/**
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* Serialize view vars
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*
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* @param array $serialize The viewVars that need to be serialized
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* @return string The serialized data
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*/
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protected function _serialize($serialize) {
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if (is_array($serialize)) {
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$data = array();
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foreach ($serialize as $key) {
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$data[$key] = $this->viewVars[$key];
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}
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} else {
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$data = isset($this->viewVars[$serialize]) ? $this->viewVars[$serialize] : null;
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}
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return json_encode($data);
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}
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}
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