从Select Jquery获取选项

Question

$('document').ready(function(){
    var catid, action, data, selectid;
    $('select.cat-selector').on('change', function() { 
        catid = $(this).val();
        action = 'getsubcatbyidList';
        data = { action: action, catid: catid };
        $('#input-catid').val(catid);
        // Sub Category
        getsubcat(catid,action,"");
    });
    $('select.sub-category').on('change', function() {
        $selectid = $(this).find('option:selected');
        var id = $selectid.val();
        $('#input-subcatid').val(selectid);
    });
});

Ajax函数getsubcat(catid,action,"");

function getsubcat(catid,action,selectid){
    var data = { action: action, catid: catid, selectid : selectid };
    $.ajax({
        type: "POST",
        url: ajaxurl+'?action='+action,
        data: data,
        success: function(result){
            if (result !== '') {
                $(".subcategory").html(result);
            }
        }
    });
    $('*[data-ajax-catid='+catid+']').addClass('link-active');
    $('button').prop('disabled', false);
}

和HTML

<form method="post">
                                <div class="btn-section">
                                    <input type="text" id="input-catid" name="catid" value="">
                                    <input type="text" id="input-subcatid" name="subcatid" value="">
                                    <button type="submit" name="choose-category" id="next-btn" class="btn btn-primary text-caps" disabled>Proceed</button>
                                </div>
                            </form>

以上代码处理此任务，选择使用Cat ID的类别，并且还存储在隐藏的输入标记中，提取子类别和选择子类别，它应该获取子类别ID，但它没有＆＃ 39;工作。我如何处理这些Bug，Jquery问题？我需要你的帮助