Here's how I solved the problem:
/app/controllers/test_controller.php
<?php
class TestController extends AppController
{
var $uses = array();
var $layout = 'test';
var $helpers = array('Html', 'Javascript');
var $components = array('Json');
function index()
{
}
function getText()
{
$this->set('text', $this->Json->encode(array('text' => 'Hello
World!')));
$this->render('json', 'ajax');
}
}
?>
/app/views/layouts/test.thtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<?php print $html->charsetTag('UTF-8') ?>
<?php print $javascript->link('prototype') ?>
</head>
<body>
<?php echo $content_for_layout ?>
</body>
</html>
/app/views/test/index.thtml
<p>The text below is retrieved asynchronously from the server:</p>
<div id="sometext"></div>
<script type="text/javascript">
// <![CDATA[
new Ajax.Request('<?php echo $html->url('/test/getText'); ?>',
{onSuccess:displayText});
function displayText(response, json)
{
document.getElementById('sometext').innerHTML = json.text;
}
// ]]>
</script>
/app/views/test/json.thtml
<?php header("X-JSON: $text"); ?>
I'm using the JsonComponent I just added to snippets:
http://cakeforge.org/snippet/detail.php?type=snippet&id=74
To use JsonComponent you also need the JSON-PHP library JSON.php in
your /vendors directory.
So basically in client-side javascript an Ajax.Request calls the
getText action in TestController, which creates a PHP array of some
text and uses the JsonComponent to encode it in JSON format. That
action then renders a json view that just sends a X-JSON header with
the JSON text. Then back on the client-side, the onSuccess handler
gets a 2nd argument that Prototype magically sticks the JSON data in.
You can then use that json object to display the data you got from the
server.
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