如何动态将项目添加到paper-dropdown菜单中? [英] How can I dynamically add items into paper-dropdown-menu?

问题描述

我尝试用dropdownMenu.appendChild(menuItem)之类的方式添加它，但是正如我所期望的那样，它不起作用.我在Polymer指南中找不到与此相关的信息，也在这里找不到其他类似的问题.

I tried adding it with like dropdownMenu.appendChild(menuItem) but as I expected this doesn't work. I couldn't find information about this on Polymer's guides nor other similar questions on here.

有可能吗?如果可以，怎么办?

Is that possible? If so, how?

paper-dropdown-menu: https://elements.polymer-project. org/elements/paper-dropdown-menu

paper-dropdown-menu: https://elements.polymer-project.org/elements/paper-dropdown-menu

推荐答案

在Polymer中，推荐的操作DOM的方法是通过操作数据:

In Polymer, recommended way of manipulating the DOM is by manipulating the data:

• 将数组中的菜单项列表放入:var items_array = [....];

-将菜单创建为:

<paper-dropdown-menu label="Your favourite pastry">
  <paper-listbox class="dropdown-content">
    <template is="dom-repeat" items="{{items_array}}">
      <paper-item>{{item}}</paper-item>
    </template>
  </paper-listbox>
</paper-dropdown-menu>

• 在items_array中添加和删除元素将立即影响菜单.
• adding and removing elements in items_array will affect the menu immediately.

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