请问YII里，要怎么做弹窗页面然后修改弹窗的内容。 [ 2.0 版本 ]

模板list.php

<?php echo $this->render('remarks',['model'=>$remarkModel]);?>
<script type="text/javascript">
    $(document).ready(function(){
       	$(".btn_edit").click(function(){
            $.ajax({
                url: "<?=yii::$app->request->baseUrl;?>/usersupervise/remarksuser",
                type: "get",
                data: {openid : 'o_-7SspsJjg4e8_dxtSznVGPJ9H4'},
                success: function(data){
                    $('.showDiv_opaciy, .showDiv_edit').show();
                }
            });
        });
    });
</script>

模板tanchuang.php

<?php
    use yii\helpers\Html;
    use yii\widgets\ActiveForm;
?>
<div class="showDiv_edit" style="display:none">
    <div class="showDiv_title"><a href="javascript:void(0);" class="fr close"><img src="<?=yii::$app->request->baseUrl;?>/img/close.gif" width="17" height="16" alt="关闭" /></a>
        <h2>备注用户名</h2>
    </div>
    <div class="showDiv_con"> <span class="fr limit_num">2/30</span>
        <?php $form = ActiveForm::begin(); ?>
        <?= $form->field($model, 'remarkname',['inputOptions' => ['class' => 'inputText inputText_w230 inputText_remarkName']]) ?>
        <div class="btn_bar">
            <?= Html::submitButton('确认', ['class' => 'btn btn_primary']) ?>
            <a href="javascript:void(0);" class="btn btn_default">取消</a>
        </div>
        <?php ActiveForm::end(); ?>
    </div>
</div>

控制器user.php

public function actionRemarksuser()
{
if(yii::$app->request->isAjax){

            if ($model->load(Yii::$app->request->post()) && $model->validate()) {
                print_r($openId['fromusername']);//打印不出来
            }
            return $this->renderAjax('remarks',['model'=>$model]);
        }
}

里面要如何操作？？？
在线等大神。