jquery, ajax, php, json - is there a good cascade/chained select plugin for jquery?

Does anyone know for a good cascade/chained select 开发者_JS百科jquery 1.4.x plugin(s) (or jquery ui widget) that uses ajax call to php that returns json format data for populating options?

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This question is vague, but you can use the .post() function to post requests to a PHP file and then have the PHP create an array and use json_encode() to encode the array into JSON and then echo that JSON data, which can be received by the jQuery .post(). Do something like this:

jQuery:

$.post("you_php_file.php",{ request: "YOUR_REQUEST" },function(data){
    //do something with the data, stored with the variable data
    $('ul li:nth-child(1)').html(data[0]);
    $('ul li:nth-child(2)').html(data[1]);
},"json")

PHP:

$request = $_POST['request'];
//create an array with the data you want to send to JavaScript
$array = array();
$array[] = 'Hello';
$array[] = 'World!';
echo json_encode($array);