我遇到类似的问题，在弹出窗口中显示选择下拉列表。选择下拉菜单可见，但它没有响应点击事件。页面高度小于弹出窗口覆盖的高度。在向身体标记添加最小高度后，选择再次起作用。下面是我使用的示例css。

I've faced similar issue while trying to show select dropdown in a popup. Select dropdown was visible but it was not responding to click events. The page height was less than what the popup was covering. After adding min-height to body tag, "select" was functional again. Below is sample css that I'm using.

body{
    min-height:300px;
}

.popup-wrapper{
    position:absolute;
    top:40%;
}

希望这有帮助。