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209 lines
5.6 KiB
Markdown
209 lines
5.6 KiB
Markdown
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## Configuration
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### Default configs
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Internally, `<zero-md>` uses the following defaults in its constructor:
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```js
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{
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// URLs of Marked and Prism libraries
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markedUrl: 'https://cdn.jsdelivr.net/gh/markedjs/marked@3/marked.min.js',
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// URLs in an array are loaded in the prescribed order
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prismUrl: [
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// Add `data-manual` attribute to its `<script>` tag
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['https://cdn.jsdelivr.net/gh/PrismJS/prism@1/prism.min.js', 'data-manual'],
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'https://cdn.jsdelivr.net/gh/PrismJS/prism@1/plugins/autoloader/prism-autoloader.min.js'
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],
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// External stylesheets are loaded in the prescribed order
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cssUrls: [
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'https://cdn.jsdelivr.net/gh/sindresorhus/github-markdown-css@4/github-markdown.min.css',
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'https://cdn.jsdelivr.net/gh/PrismJS/prism@1/themes/prism.min.css'
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],
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// Host styles that apply to each instance
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hostCss: ':host{display:block;position:relative;contain:content;}:host([hidden]){display:none;}'
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}
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```
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`markedUrl` and `prismUrl` can either be a string, or an array of strings, and are automatically
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loaded into the document via `<script>` tags upon element initialisation. If defined as an array,
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the scripts are guaranteed to load **sequentially**.
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#### Host styles
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By default, each instance of `<zero-md>` has the following host styles applied onto itself:
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```css
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:host {
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display: block;
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position: relative;
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contain: content;
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}
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:host([hidden]) {
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display: none;
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}
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```
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These are *sensible defaults* that help normalise behaviour across browsers and should be apt for most use-cases.
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If need be, you can easily override these styles from outside the element.
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```html
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<style>
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#foo {
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display: inline-block;
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contain: none;
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}
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</style>
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...
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<zero-md id="foo" src="example.md"></zero-md>
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```
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#### Marked and Prism libraries
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Upon initialisation, `<zero-md>` first checks if the Marked and Prism libraries are already loaded.
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If not, `<zero-md>` then load the libraries from their respective CDN locations specified
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in `markedUrl` and `prismUrl`. This only happens *once*; multiple instances of `<zero-md>` that are
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declared in the same document should not cause "double-loading".
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The recommended way to override the default CDN locations is to load the libraries yourself *before*
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loading `<zero-md>`. For example:
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```html
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<head>
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<!-- Load Marked and Prism yourself -->
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<script defer src="/lib/marked.js"></script>
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<script defer src="/lib/prism.js"></script>
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<!-- Then load `<zero-md>` -->
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<script type="module" src="https://cdn.jsdelivr.net/gh/zerodevx/zero-md@2/dist/zero-md.min.js"></script>
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</head>
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```
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#### Default style template
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By default, each instance of `<zero-md>` applies the external stylesheets defined in `cssUrls`. Internally,
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```html
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<zero-md src="example.md"></zero-md>
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```
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is semantically equivalent to this:
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```html
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<zero-md src="example.md">
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<template>
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<style>
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:host {
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display: block;
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position: relative;
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contain: content;
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}
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:host([hidden]) {
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display: none;
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}
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</style>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/sindresorhus/github-markdown-css@4/github-markdown.min.css">
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/PrismJS/prism@1/themes/prism.min.css">
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</template>
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</zero-md>
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```
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You can override the default style template by passing in a new one.
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```html
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<zero-md src="example.md">
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<!-- This overrides the default template -->
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<template>
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<link rel="stylesheet" href="/custom-styles.css">
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</template>
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</zero-md>
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```
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### Global config object
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To override the default configs **globally** to **all** instances of `<zero-md>`, a `ZeroMdConfig` object
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hoisted to the global `window` scope can be defined. For example:
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```html
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<head>
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<!-- Define globals first -->
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<script>
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window.ZeroMdConfig = {
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markedUrl: '/lib/marked.js',
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prismUrl: '/lib/prism.js',
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cssUrls: [
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'/styles/markdown.css',
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'/styles/highlight.css'
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],
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hostCss: ':host{display:inline-block;}'
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}
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</script>
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<!-- Then load `<zero-md>` -->
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<script type="module" src="/lib/zero-md.min.js"></script>
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</head>
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<body>
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...
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<!-- New configs apply to all instances of `<zero-md>` -->
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<zero-md src="example.md"></zero-md>
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</body>
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```
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#### Change default style template globally
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By default, `<zero-md>` uses a Github-themed stylesheet paired with a light-themed one for code blocks.
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To update the default external stylesheets globally, define a global config object.
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```html
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<head>
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<script>
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window.ZeroMdConfig = {
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// Use these stylesheets in default template
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cssUrls: [
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'/styles/markdown.css',
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'/styles/highlight.css'
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]
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}
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</script>
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<script type="module" src="/lib/zero-md.min.js"></script>
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</head>
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<body>
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...
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<!-- Now, every instance of `<zero-md>` -->
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<zero-md src="example.md"></zero-md>
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...
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<!-- Is semantically equivalent to this -->
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<zero-md src="example.md">
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<template>
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<link rel="stylesheet" href="/styles/markdown.css">
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<link rel="stylesheet" href="/styles/highlight.css">
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</template>
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</zero-md>
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</body>
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```
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#### Change globals in web project
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If you're using `<zero-md>` in a web project with a bundler, something like this should work:
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```js
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import ZeroMd from 'zero-md'
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// Define a new custom class
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class ZeroMdCustom extends ZeroMd {
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constructor () {
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// Call `super()` with new configs
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super({
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markedUrl: '/lib/marked.js',
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prismUrl: '/lib/prism.js',
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cssUrls: [
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'/styles/markdown.css',
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'/styles/highlight.css'
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],
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hostCss: ':host{display:inline-block;}'
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})
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}
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}
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// Register the element with custom class
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customElements.define('zero-md', ZeroMdCustom)
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```
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