Best way to include custom JavaScript in AMP

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I read all documentation about script tag but I cannot find how to include a custom JavaScript in AMP HTML.

I know the <script> tag is prohibited unless its type is application/ld+json.

There are default AMP HTML runtime components and extended components which contain specific form for different components, but I could not find a specific one for custom JavaScript.

Here is the script tag I want to include in AMP HTML;

<script src="https://arifkarim.com/widget/layouts/global/js/legaltext.js"></script>
amp-html javascript
6 Answers

Now no need to use amp-iframe because of AMP natively support javascript as mentioned in the official document

AMP pages support custom JavaScript through the <amp-script> component as like below :

<!doctype html>
<html ⚡>
<head>
  ...
  <script async custom-element="amp-script" src="https://cdn.ampproject.org/v0/amp-script-0.1.js"></script>
<body>  
  ...
  <amp-script layout="container" src="https://example.com/myfile.js">
    <p>Initial content that can be modified from JavaScript</p>
  </amp-script>
  ...
</body>
</html>

Here is official amp-script specs

user_52467060

AMP allow the use of custom JavaScript in both development and production mode without necessitating a (iframe) hack.

To include a custom JavaScript in your AMP page, make use of the <amp-script> component.

Below, a snippet illustrating how to use the <amp-script> component;

<!doctype html>
<html amp lang="en">
<head>
  <meta charset="utf-8">
  <script async src="https://cdn.ampproject.org/v0.js"></script>
  <!-- Important to add "amp-script" custom element reference -->
  <script async custom-element="amp-script" src="https://cdn.ampproject.org/v0/amp-script-0.1.js"></script>
  <title>AMP with custom JavaScript</title>
  <link rel="canonical" href=".">
  <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>
  </head>
<head>
<body>
  <amp-script layout="container" src="https://example.com/my-custom-javascript.js">
    <p>Here, content that you may want to modify using a custom JavaScript</p>
  </amp-script>
</body>
</html>

Note that the reference to your custom JavaScript can either be a relative or full path.

It is good to note that AMP enforces a limit of 150 kilobytes of custom JavaScript for all <amp-script> component on any given page.

The reason for the 150 kilobytes of custom JavaScript for all <amp-script> component is to keep performance in check.

user_63817110
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