amp-render
Introduction
The amp-render
component provides a simple way to load JSON from a server and render it using a mustache template.
Setup
First, you need to import the script for the amp-render
extension.
<script async custom-element="amp-render" src="https://cdn.ampproject.org/v0/amp-render-1.0.js"></script>
When you use amp-render
, you'll almost certainly also want to use amp-mustache
.
<script async custom-template="amp-mustache" src="https://cdn.ampproject.org/v0/amp-mustache-0.2.js"></script>
In the final example on this page, we'll also be using amp-script
, so we'll import that extension's script as well.
<script async custom-element="amp-script" src="https://cdn.ampproject.org/v0/amp-script-0.1.js"></script>
Basic example
Here's a basic example, applying a simple template to a simple JSON object. The JSON looks like this:
{ "country": "Nigeria", "city": "Lagos" }
Here's the <amp-render>
and the <template>
:
<amp-render class="sample" src="/static/samples/json/cities-lagos.json" layout="fixed-height" height="60">
<template type="amp-mustache">
<div class="line">{{city}} is a city in {{country}}.</div>
</template>
</amp-render>
Iterating through a list
In this example, we drill down to access a sub-object of some more elaborate JSON. Our template then iterates through elements of the array that sub-object contains.
<amp-render class="sample" src="/static/samples/json/cities.json" layout="fixed-height" height="105">
<template type="amp-mustache">
{{#planets}}
{{#earth}}
{{#continents}}
{{#africa}}
<div class="line">{{city}} is a city in {{country}}.</div>
{{/africa}}
{{/continents}}
{{/earth}}
{{/planets}}
</template>
</amp-render>
Using more attributes
Now, let's try some more attributes.
-
binding:
binding="never"
tells AMP there's no need to evaluateamp-bind
bindings in this template. This is more efficient, especially as our template contains no bindings. -
key: this allows us to choose a child of the JSON object, and apply that to the template instead of the entire object.
-
template: this lets us specify a template that's not a child of the
amp-render
.
<amp-render class="sample" src="/static/samples/json/cities.json" layout="fixed-height" height="105" binding="never" key="planets.earth.continents" template="cities-countries">
</amp-render>
<template id="cities-countries" type="amp-mustache">
{{#africa}}
<div class="line">{{city}} is a city in {{country}}.</div>
{{/africa}}
</template>
Using amp-script
amp-render
can also use amp-script
as a data source. In this example, instead of using the key
attribute, we fetch the city data with our own JavaScript, then extract the desired sub-object.
To learn more about fetching data with amp-script
, see this amp-script
example.
<amp-render class="sample" src="amp-script:dataFunctions.fetchData" layout="fixed-height" height="52">
<template type="amp-mustache">
{{#southAmerica}}
<div class="line">{{city}} is a city in {{country}}.</div>
{{/southAmerica}}
</template>
</amp-render>
<amp-script id="dataFunctions" script="fetch-data-script" nodom></amp-script>
<script id="fetch-data-script" type="text/plain" target="amp-script">
function fetchData(index) {
return fetch('https://amp.dev/static/samples/json/cities.json')
.then(resp => resp.json())
.then(findContinentsData)
}
function findContinentsData(json) {
return json.planets.earth.continents;
}
exportFunction('fetchData', fetchData);
</script>
Nếu bạn vẫn còn thắc mắc sau khi đọc hướng dẫn trên trang này, hãy liên hệ với những người dùng AMP khác để thảo luận về trường hợp sử dụng cụ thể của bạn.
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Chỉnh sửa mẫu trên GitHub-
Written by @morss