Eleventy: How to add IDs for headings

[shadeed]

Hello,

Thanks for this great tool. I'm new to it and coming from Jekyll background.
I'm writing in Markdown and wanted to add an ID to each heading automatically. What's the easiest way to do so? Here is an example:

<h2 id="this-is-a-heading">This is a heading</h2>

Here is my config file:

module.exports = function(eleventyConfig) {
  eleventyConfig.addPassthroughCopy('src/images')
  const syntaxHighlight = require("@11ty/eleventy-plugin-syntaxhighlight")
  eleventyConfig.addPlugin(syntaxHighlight);

  let markdownIt = require("markdown-it");
  let options = {
    html: true,
    breaks: true,
    linkify: true
  };

  eleventyConfig.setLibrary("md", markdownIt(options));

  return {
    dir: { input: 'src', output: 'dist', data: '_data' },
    passthroughFileCopy: true
  }
}

Thanks a lot,

[shadeed]

Closed this since I forked https://github.com/11ty/eleventy-base-blog and used it to suit my needs. Thanks @zachleat for the great starter!

[svivian]

For future reference since I just had the same problem, the answer is to use markdown-it-anchor. The part you need from the base blog config is:

const markdownIt = require("markdown-it");
const markdownItAnchor = require("markdown-it-anchor");

module.exports = function(eleventyConfig) {
  /* Markdown Overrides */
  let markdownLibrary = markdownIt({
    html: true,
    breaks: true,
    linkify: true
  }).use(markdownItAnchor, {
    permalink: true,
    permalinkClass: "direct-link",
    permalinkSymbol: "#"
  });
  eleventyConfig.setLibrary("md", markdownLibrary);
};