Google AMP - Selector 选择器
Amp-selector 是一个 amp 组件，它显示选项菜单，用户可以在选项之间进行选择。显示的选项可以是文本、图像或任何其他 amp 组件。在本章中，我们将详细讨论这一点。
要使用 amp-selector，我们需要包含以下 javascript 文件 −
<script async custom-element = "amp-selector"
src = "https://cdn.ampproject.org/v0/amp-selector-0.1.js">
</script>
amp-selector 的格式
以下代码显示了 amp-selector 格式的示例 −
<amp-selector layout = "container">
<amp-img src = "images/christmas1.jpg"
width = "60"
height = "40"
option = "1">
<amp-img src = "images/christmas2.jpg"
width = "60"
height = "40"
option = "2">
</amp-img>
<amp-img src = "images/christmas3.jpg"
width = "60"
height = "40"
option = "3">
</amp-img>
<amp-img src = "images/christmas4.jpg"
width = "60"
height = "40"
option = "4">
</amp-img>
</amp-selector>
您可以在 amp-selector 中使用标准 html 标签或 amp 组件。内容像菜单一样显示在屏幕上，用户可以在它们之间进行选择。显示的菜单可以是单选或多选。
让我们借助下面给出的单选和多选示例来理解这一点。
Amp Selector 单选
以下代码是 amp-selector 单选的示例 −
<!doctype html>
<html amp lang = "en">
<head>
<meta charset = "utf-8">
<script async src = "https://cdn.ampproject.org/v0.js"></script>
<title>Google AMP - Amp Selector</title>
<link rel = "canonical" href = "http://example.ampproject.org/article-metadata.html">
<meta name="viewport" content="width=device-width,minimum-scale = 1,initial-scale = 1">
<style amp-boilerplate>
body{-
webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;animation:
-amp-start 8s steps(1,end) 0s 1 normal both
}
@-webkit-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}
</style>
<noscript>
<style amp-boilerplate>
body{
-webkit-animation:none;-moz-animation:none;
-ms-animation:none;animation:none}
</style>
</noscript>
<script async custom-element="amp-selector"
src = "https://cdn.ampproject.org/v0/amp-selector-0.1.js">
</script>
<style amp-custom>
amp-selector:not([disabled])
amp-img[option][selected]:not([disabled]) {
outline-color: #b6A848;
outline-width: 2px;
}
</style>
</head>
<body>
<h3>Google AMP - Amp Selector</h3>
<amp-selector layout = "container">
<amp-img src = "images/christmas1.jpg"
width = "60"
height = "40"
option="1">
</amp-img>
<amp-img src="images/christmas2.jpg"
widt h = 60"
height = "40"
option = "2">
</amp-img>
<amp-img src = "images/christmas3.jpg"
width = "60"
height = "40"
option = "3">
</amp-img>
<amp-img src = "images/christmas4.jpg"
width = "60"
height = "40"
option = "4">
</amp-img>
</amp-selector>
</body>
</html>
输出
上述代码的输出如下所示 −
请注意，在上面的示例中，我们使用了 amp-selector 并使用其中的图像来显示选项。它是一个单选选择器，因此您可以选择输出中所示的任意一个图像。
Amp Selector 多选
在此示例中，让我们使用多个属性显示带有图像的 amp-selector，我们可以从选择器中选择多个选项。
示例
<!doctype html>
<html amp lang = "en">
<head>
<meta charset = "utf-8 ">
<script async src = "https://cdn.ampproject.org/v0.js"></script>
<title>Google AMP - Amp Selector</title>
<link rel = "canonical" href = "http://example.ampproject.org/article-metadata.html">
<meta name = "viewport" content = "width = device-width,minimum-scale = 1,initial-scale =1">
<style amp-boilerplate>
body{-webkit-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;animation:
-amp-start 8s steps(1,end) 0s 1 normal both}
@-webkit-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}
</style>
<noscript>
<style amp-boilerplate>
body{
-webkit-animation:none;-moz-animation:none;
-ms-animation:none;animation:none
}
</style>
</noscript>
<script async custom-element = "amp-selector"
src = "https://cdn.ampproject.org/v0/amp-selector-0.1.js">
</script>
<style amp-custom>
amp-selector:not([disabled])
amp-img[option][selected]:not([disabled]) {
outline-color: blue;
outline-width: 2px;
}
</style>
</head>
<body>
<h3>Google AMP - Amp Selector</h3>
<amp-selector layout = "container" multiple>
<amp-img src = "images/christmas1.jpg"
width = "60"
height ="40"
option = "1">
</amp-img>
<amp-img src="images/christmas2.jpg"
width = "60"
height = "40"
option = "2">
</amp-img>
<amp-img src ="images/christmas3.jpg"
width = "60"
height = "40"
option = "3">
</amp-img>
<amp-img src = "images/christmas4.jpg"
width = "60"
height = "40"
option = "4">
</amp-img>
</amp-selector>
</body>
</html>
输出
上述代码的输出如下所示 −
我们还可以使用 amp-selector 显示单选按钮，如下面给出的代码所示 −
示例
<!doctype html>
<html amp lang = "en">
<head>
<meta charset = "utf-8">
<script async src = "https://cdn.ampproject.org/v0.js"></script>
<title>Google AMP - Amp Selector</title>
<link rel = "canonical" href = "http://example.ampproject.org/article-metadata.html">
<meta name = "viewport" content ="width = device-width,minimum-scale = 1,initial-scale = 1">
<style amp-boilerplate>
body{
-webkit-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:
-amp-start 8s steps(1,end) 0s 1 normal both;animation:
-amp-start 8s steps(1,end) 0s 1 normal both
}
@-webkit-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes
-amp-start{from{visibility:hidden}to{visibility:visible}}
</style>
<noscript>
<style amp-boilerplate>
body{
-webkit-animation:none;
-moz-animation:none;
-ms-animation:none;
animation:none}
</style>
</noscript>
<script async custom-element = "amp-selector"
src = "https://cdn.ampproject.org/v0/amp-selector-0.1.js">
</script>
<style amp-custom>
.radio-menu {
list-style: none;
}
.radio-menu [option][selected] {
outline: none;
}
.radio-menu [option] {
display: flex;
align-items: center;
}
.radio-menu [option]:before {
transition: background 0.25s ease-in-out;
content: "";
display: inline-block;
width: 24px;
height: 24px;
margin: 8px;
border-radius: 100%;
border: solid 1px black;
}
.radio-menu [option = red][selected]:before {
text-align: center;
content: "✓";
color: white;
background: red;
}
.radio-menu [option = green][selected]:before {
text-align: center;
content: "✓";
color: white;
background: green;
}
.radio-menu [option = blue][selected]:before {
text-align: center;
content: "✓";
color: white;
background: blue;
}
</style>
</head>
<body>
<h3>Google AMP - Amp Selector</h3>
<amp-selector class = "radio-menu" layout = "container" name = "my-selector">
<div option = "red">Red</div>
<div option = "green">Green</div>
<div option = "blue">Blue</div>
</amp-selector>
</body>
</html>
输出
