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hast-util-to-dom

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hast utility to transform to a DOM tree.

Contents

What is this?

This package is a utility that creates a DOM tree (defaulting to the actual DOM but also supporting things like jsdom) from a hast (HTML) syntax tree.

When should I use this?

You can use this project when you want to turn hast into a DOM in browsers, either to use it directly on a page, or to enable the use of DOM APIs (such as querySelector to find things or innerHTML to serialize stuff).

The hast utility hast-util-from-dom does the inverse of this utility. It turns DOM trees into hast.

The rehype plugin rehype-dom-stringify wraps this utility to serialize as HTML with DOM APIs.

Install

This package is ESM only. In Node.js (version 16+), install with npm:

npm install hast-util-to-dom

In Deno with esm.sh:

import {toDom} from 'https://esm.sh/hast-util-to-dom@4'

In browsers with esm.sh:

<script type="module">
  import {toDom} from 'https://esm.sh/hast-util-to-dom@4?bundle'
</script>

Use

Say our page example.html looks as follows:

<!doctype html>
<title>Example</title>
<body>
  <script type="module">
    import {h} from 'https://esm.sh/hastscript?bundle'
    import {toDom} from 'https://esm.sh/hast-util-to-dom?bundle'

    const tree = h('main', [
      h('h1', 'Hi'),
      h('p', [h('em', 'Hello'), ', world!'])
    ])

    document.body.append(toDom(tree))
  </script>

Now running open example.html shows the main, h1, and p elements on the page.

API

This package exports the identifier toDom. There is no default export.

toDom(tree[, options])

Turn a hast tree into a DOM tree.

Parameters
Returns

DOM node (DomNode).

AfterTransform

Callback called when each node is transformed (TypeScript type).

Parameters
Returns

Nothing.

Options

Configuration (TypeScript type).

Fields

Syntax tree

The syntax tree is hast.

Types

This package is fully typed with TypeScript. It exports the additional types AfterTransform and Options.

Compatibility

Projects maintained by the unified collective are compatible with maintained versions of Node.js.

When we cut a new major release, we drop support for unmaintained versions of Node. This means we try to keep the current release line, hast-util-to-dom@^4, compatible with Node.js 16.

Security

Use of hast-util-to-dom can open you up to a cross-site scripting (XSS) attack if the hast tree is unsafe. Use hast-util-santize to make the hast tree safe.

Related

Contribute

See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.

License

ISC © Keith McKnight

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