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# markdown-it-anchor [![npm version](http://img.shields.io/npm/v/markdown-it-anchor.svg?style=flat-square)](https://www.npmjs.org/package/markdown-it-anchor)

> Header anchors for [markdown-it].

[markdown-it]: https://github.com/markdown-it/markdown-it

English | [中文 (v7.0.1)](./README-zh_CN.md)

## Usage

```js
const md = require('markdown-it')()
  .use(require('markdown-it-anchor'), opts)
```

See a [demo as JSFiddle](https://jsfiddle.net/9ukc8dy6/).

The `opts` object can contain:

Name                   | Description                                                    | Default
-----------------------|----------------------------------------------------------------|-----------------------------------
`level`                | Minimum level to apply anchors on or array of selected levels. | 1
`slugify`              | A custom slugification function.                               | See [`index.js`](index.js)
`uniqueSlugStartIndex` | Index to start with when making duplicate slugs unique.        | 1
`permalink`            | Whether to add permalinks next to titles.                      | `false`
`renderPermalink`      | A custom permalink rendering function.                         | See [`index.js`](index.js)
`permalinkClass`       | The class of the permalink anchor.                             | `header-anchor`
`permalinkSpace`       | Place space between the header text and the permalink anchor.  | `true`
`permalinkSymbol`      | The symbol in the permalink anchor.                            | `¶`
`permalinkBefore`      | Place the permalink before the title.                          | `false`
`permalinkHref`        | A custom permalink `href` rendering function.                  | See [`index.js`](index.js)
`permalinkAttrs`       | A custom permalink attributes rendering function.              | See [`index.js`](index.js)
`callback`             | Called with token and info after rendering.                    | `undefined`

The `renderPermalink` function takes the slug, an options object with
the above options, and then all the usual markdown-it rendering
arguments.

All headers above `level` will then have an `id` attribute with a slug
of their content. `level` can also be an array of headers levels to
apply the anchor, like `[2, 3]` to have an anchor on only level 2 and
3 headers.

If `permalink` is `true`, a `¶` symbol linking to the header itself will
be added.

You may want to use the [link symbol](http://graphemica.com/🔗) as
`permalinkSymbol`, or a symbol from your favorite web font.

The `callback` option is a function that will be called at the end of
rendering with the `token` and an `info` object.  The `info` object has
`title` and `slug` properties with the token content and the slug used
for the identifier.

## User-Friendly URLs

Starting from `v5.0.0`, `markdown-it-anchor` dropped package `string`
keeping it's core value of being an unopinionated and secure library. Yet,
users looking for backward compatibility may want the old slugify:

```sh
$ npm i -S string
```

```js
const string = require('string')
const legacySlugify = s => string(s).slugify().toString()

const md = require('markdown-it')()
const anchor = require('markdown-it-anchor', {
	slugify: legacySlugify
})
```

## Unicode Support

Unicode is supported by default. Yet, if you are looking for a "prettier"
--opinionated-- link, _i.e_ without %xx, you may want to take a look at `uslug`:

```sh
$ npm i -S uslug
```

```js
const uslug = require('uslug')
const uslugify = s => uslug(s)

const md = require('markdown-it')()
const anchor = require('markdown-it-anchor', {
	slugify: uslugify
})
```

## Table of Contents

Looking for an automatic table of contents (TOC) generator? Take a look at
[markdown-it-toc-done-right](https://www.npmjs.com/package/markdown-it-toc-done-right) it's
made from the ground to be a great companion of this plugin.

## Browser Example

See `example.html`.