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Code playgrounds in HTML or Markdown pages

Here is how to embed interactive code snippets into your HTML or Markdown pages:

Interactive code block

Let's start with a simple use case. Suppose you have a static code snippet in Python:

<pre>
msg = "Hello, World!"
print(msg)
</pre>

To make it interactive, add a codapi-snippet element right after the pre element:

<pre>
msg = "Hello, World!"
print(msg)
</pre>

<codapi-snippet sandbox="python" editor="basic"></codapi-snippet>

Note two properties here:

  • sandbox defines the engine that will execute the code. Usually it's the name of the language or software, like python, bash or sqlite.
  • editor = basic enables code snippet editing.

Finally, include the default styles in the head:

<link rel="stylesheet" href="https://unpkg.com/@antonz/[email protected]/dist/snippet.css" />

And the JavaScript file at the bottom of the page:

<script src="https://unpkg.com/@antonz/[email protected]/dist/snippet.js"></script>

(CDNs like unpkg can sometimes be slow, so it's even better to host both files yourself)

And that's it! The codapi-snippet will automatically attach itself to the pre, allowing you to run and edit the code:

┌───────────────────────────────┐
│ msg = "Hello, World!"         │
│ print(msg)                    │
│                               │
│                               │
└───────────────────────────────┘
  Run  Edit

To disable editing, set editor = off instead of editor = basic. To change the engine, set the appropriate sandbox value.

Attaching to a specific element

To attach codapi-snippet to the specific code element (instead of using the preceding element), set the selector property to its CSS selector:

<div id="playground">
    <pre class="code">
msg = "Hello, World!"
print(msg)
    </pre>
</div>

<!-- more HTML -->

<codapi-snippet sandbox="python" editor="basic" selector="#playground .code">
</codapi-snippet>

Syntax highlighting and rich editing

To use codapi-snippet with code editors like CodeMirror, do the following:

  1. Initialize the editor as usual.
  2. Point codapi-snippet to the editor using the selector property.
  3. Set editor="external" so that codapi-snippet does not interfere with the editor functions.
<div id="editor"></div>

<!-- ... -->

<codapi-snippet sandbox="python" editor="external" selector="#editor">
</codapi-snippet>

Output modes

The widget supports multiple output modes, from plain text to SVG images, HTML fragments, and interactive DOM.

Templates

Templates help to keep snippets concise by hiding parts of the code behind the scenes.

Files

For larger programs, you can pass multiple files along with the main one.

Custom actions

You can add buttons to the toolbar to run commands and trigger events.

Code cells

Code cells are snippets that depend on each other. This results in Jupyter notebook-like behavior and eliminates the need for code duplication.

Sandbox version

Some sandboxes support multiple versions (e.g. the latest released version and the next beta or release candidate version). By default, the widget uses the latest version, but you can change this using the version attribute:

<codapi-snippet sandbox="sqlite:dev" editor="basic">
</codapi-snippet>

The appropriate version must be enabled on the server.

Global settings

To change the Codapi settings, use the codapi-settings element. First, load it from the CDN:

<script src="https://unpkg.com/@antonz/[email protected]/dist/settings.js"></script>

Then use it like this:

<codapi-settings prop1="value1" prop2="value2"... propN="valueN">
</codapi-settings>

Or import the codapi object and set the settings in the code:

import { codobj } '@antonz/codapi/dist/settings.mjs';

codobj.settings.prop1 = "value1";
codobj.settings.prop2 = "value2";
// ...
codobj.settings.propN = "valueN";

See the list of available settings below.

Self-hosted server

If you are using a self-hosted codapi server, point the widget to it using the url setting:

<codapi-settings url="http://localhost:1313/v1">
</codapi-settings>

Specify the protocol (http/https) and hostname or IP like this:

http://localhost:1313/v1
http://192.168.1.42:1313/v1
https://codapi.example.org/v1

Note that the /v1 part stays the same — it's the path the Codapi server uses for API requests.