sugarHoge/IndexController.php

## index.phtml
<html>
    <head>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
        <script type="text/javascript">
            function changeSelect(){
                $.ajax({
                    type: "POST",
                    url: "<?php echo $this->url; ?>/ajax",
                    dataType: 'json',
                    data:"hoge="+$("#hoge").val(),
                    error: function(){
                        alert("error");
                    },
                    success: function(data){

                        $("#select").empty();
                        for(var i in data){
                            $("#select").append("<option value='" + data[i] + "'>" + data[i] + "</option>");
                        }
                    }
                });
            }
        </script>
    </head>
    <body>
        <form name="form1" method="post">
            <select id="hoge" name="hoge" onchange="changeSelect()">
                <option value=""></option>
                <option value="token1">token1</option>
                <option value="token2">token2</option>
                <option value="token3">token3</option>
            </select>
            <select id="select">
            </select>
        </form>
    </body>
</html>

## IndexController.php
<?php

class IndexController extends Zend_Controller_Action
{

    public function init()
    {
        $req = $this->getRequest();
        $this->url = $req->getBaseUrl()."/".$req->getModuleName()."/".$req->getControllerName();
        $this->view->assign('url',  $this->url);

    }

    public function indexAction()
    {
        // action body
    }

    public function ajaxAction()
    {
        //ビューを使わない
        $this->_helper->viewRenderer->setNoRender();
        $req = $this->getRequest();
        $arr = array(
            'token1'=>array(
                'token_1111111111', 'token_2222222222', 'token_3333333333'
            ),
            'token2'=>array(
                'token_aaaaaaaaaa', 'token_bbbbbbbbbb', 'token_cccccccccc'
            ),
            'token3'=>array(
                'token_あああああ', 'token_いいいいい', 'token_えええええ'
            )
        );
        echo Zend_Json::encode($arr[$req->getParam('hoge')]);
    }

}
	<html>
	<head>
	<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
	<script type="text/javascript">
	function changeSelect(){
	$.ajax({
	type: "POST",
	url: "<?php echo $this->url; ?>/ajax",
	dataType: 'json',
	data:"hoge="+$("#hoge").val(),
	error: function(){
	alert("error");
	},
	success: function(data){

	$("#select").empty();
	for(var i in data){
	$("#select").append("<option value='" + data[i] + "'>" + data[i] + "</option>");
	}
	}
	});
	}
	</script>
	</head>
	<body>
	<form name="form1" method="post">
	<select id="hoge" name="hoge" onchange="changeSelect()">
	<option value=""></option>
	<option value="token1">token1</option>
	<option value="token2">token2</option>
	<option value="token3">token3</option>
	</select>
	<select id="select">
	</select>
	</form>
	</body>
	</html>
	<?php

	class IndexController extends Zend_Controller_Action
	{

	public function init()
	{
	$req = $this->getRequest();
	$this->url = $req->getBaseUrl()."/".$req->getModuleName()."/".$req->getControllerName();
	$this->view->assign('url', $this->url);

	}

	public function indexAction()
	{
	// action body
	}

	public function ajaxAction()
	{
	//ビューを使わない
	$this->_helper->viewRenderer->setNoRender();
	$req = $this->getRequest();
	$arr = array(
	'token1'=>array(
	'token_1111111111', 'token_2222222222', 'token_3333333333'
	),
	'token2'=>array(
	'token_aaaaaaaaaa', 'token_bbbbbbbbbb', 'token_cccccccccc'
	),
	'token3'=>array(
	'token_あああああ', 'token_いいいいい', 'token_えええええ'
	)
	);
	echo Zend_Json::encode($arr[$req->getParam('hoge')]);
	}

	}