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>

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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>

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Using more attributes

Now, let's try some more attributes.

binding: binding="never" tells AMP there's no need to evaluate amp-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>

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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>

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Need further explanation?

If the explanations on this page don't cover all of your questions feel free to reach out to other AMP users to discuss your exact use case.

Go to Stack Overflow

An unexplained feature?

The AMP project strongly encourages your participation and contributions! We hope you'll become an ongoing participant in our open source community but we also welcome one-off contributions for the issues you're particularly passionate about.

Edit sample on GitHub

Written by @morss