Polymer - Paper Dropdown Menu

更新于 2025/1/30 5:22:17

paper-dropdown-menu 是一个简单的下拉菜单，可用于可选内容。您可以在应用程序中使用此元素，方法是运行以下命令将其安装在项目目录中。

bower install --save PolymerElements/paper-dropdown-menu
bower install --save PolymerElements/paper-item
bower install --save PolymerElements/paper-listbox

示例

以下示例指定了 Polymer.js 中 paper-dropdown-menu 元素的使用。创建一个 index.html 文件并在其中添加以下代码。

<!doctype html>
<html>
   <head>
      <link rel = 'import' href = 'my-app.html'>
   </head>
   
   <body>    
      <my-app></my-app>
   </body>
</html>

现在，打开 my-app.html 文件并在其中包含以下代码。

<link rel = 'import' href='bower_components/polymer/polymer.html'>
<link rel = "import" href = "bower_components/paper-dropdown-menu/paper-dropdown-menu.html">
<link rel = "import" href = "bower_components/paper-item/paper-item.html">
<link rel = "import" href = "bower_components/paper-listbox/paper-listbox.html">

<dom-module id = 'my-app'>
   <template>
      <style is = "custom-style">
         paper-dropdown-menu {
            width:250px;
         }
         paper-dropdown-menu {
            height: 200px;
            display: block;
         }
      </style>
      
      <h3>Paper-Dropdown-Menu Example </h3>
      <paper-dropdown-menu>
         <paper-listbox class = "dropdown-content" selected = "1">
            <paper-item>Java Tutorial</paper-item>
            <paper-item>C Tutorial</paper-item>
            <paper-item>PHP Tutorial</paper-item>
            <paper-item>C++ Tutorial</paper-item>
         </paper-listbox>
      </paper-dropdown-menu>
   </template>
   
   <script>
      Polymer ({
         is: 'my-app', ready: function() {
            this.async(function() {         
            });
         }
      });
   </script>
</dom-module>