srcmini<iron-dropdown>元素用于显示隐藏的下拉菜单内容。使用铁下拉菜单的元素实现可以具有组合框, 菜单按钮, 选择等。
<iron-dropdown>元素显示相对于.dropdown-content位置配置的.dropdown-trigger的属性。
例子
打开命令提示符, 并使用以下命令转到你的项目文件夹以实现iron-dropdown元素：
bower install PolymerElements/iron-dropdown -save
<!DOCTYPE html>
<html>
<head>
<title>iron-dropdown</title>
<base href = "http://polygit.org/components/">
<script src = "webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel = "import" href = "iron-dropdown/demo/x-select.html">
<link rel = "import" href = "paper-input/paper-input.html">
<link rel = "import" href = "paper-button/paper-button.html">
<style>
.dropdown-trigger{
background-color: DarkCyan ;
border-radius: 4px;
color: white;
}
.dropdown-content {
background-color: white;
line-height: 15px;
border-radius: 5px;
box-shadow: 0px 2px 5px #ccc;
padding: 20px;
}
</style>
</head>
<body>
<h3>Iron-dropdown Example</h3>
<x-select>
<paper-button class = "dropdown-trigger">Click Me !</paper-button>
<div class = "dropdown-content">
<p>Hello !!! <br/>
<p>This is an iron-dropdown <br/> example of Polymerjs.</p>
</div>
</x-select>
</body>
</html>输出
Polmer版本2.2.3已为此元素损坏。你可以在升级版本2.2.4上使用它
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