mirror of
https://github.com/Smaug123/KaTeX
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97 lines
3.3 KiB
Markdown
97 lines
3.3 KiB
Markdown
# Auto-render extension
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This is an extension to automatically render all of the math inside of text. It
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searches all of the text nodes in a given element for the given delimiters, and
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renders the math in place.
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### Usage
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This extension isn't part of KaTeX proper, so the script needs to be included
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(via a `<script>` tag) in the page along with KaTeX itself. For example,
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using a CDN:
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```html
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0/katex.min.css" integrity="sha384-TEMocfGvRuD1rIAacqrknm5BQZ7W7uWitoih+jMNFXQIbNl16bO8OZmylH/Vi/Ei" crossorigin="anonymous">
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<script src="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0/katex.min.js" integrity="sha384-jmxIlussZWB7qCuB+PgKG1uLjjxbVVIayPJwi6cG6Zb4YKq0JIw+OMnkkEC7kYCq" crossorigin="anonymous"></script>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.9.0/contrib/auto-render.min.js" integrity="sha384-IiI65aU9ZYub2MY9zhtKd1H2ps7xxf+eb2YFG9lX6uRqpXCvBTOidPRCXCrQ++Uc" crossorigin="anonymous"></script>
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```
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Then, call the exposed `renderMathInElement` function in a script tag
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before the close body tag:
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```html
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<body>
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...
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<script>
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renderMathInElement(document.body);
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</script>
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</body>
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```
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See [index.html](index.html) for an example.
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(To run this example from a clone of the repository, run `npm start`
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in the root KaTeX directory, and then visit
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http://localhost:7936/contrib/auto-render/index.html
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with your web browser.)
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If you prefer to have all your setup inside the html `<head>`,
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you can use the following script there
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(instead of the one above at the end of the `<body>`):
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```html
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<head>
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...
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<script>
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document.addEventListener("DOMContentLoaded", function() {
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renderMathInElement(document.body);
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});
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</script>
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...
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</head>
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```
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### API
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This extension exposes a single function, `window.renderMathInElement`, with
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the following API:
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```js
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function renderMathInElement(elem, options)
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```
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`elem` is an HTML DOM element. The function will recursively search for text
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nodes inside this element and render the math in them.
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`options` is an optional object argument that can have the same keys as [the
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object passed to `katex.render`](https://github.com/Khan/KaTeX/#rendering-options),
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in addition to two auto-render-specific keys:
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- `delimiters`: This is a list of delimiters to look for math. Each delimiter
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has three properties:
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- `left`: A string which starts the math expression (i.e. the left delimiter).
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- `right`: A string which ends the math expression (i.e. the right delimiter).
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- `display`: A boolean of whether the math in the expression should be
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rendered in display mode or not.
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The default value is:
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```js
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[
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{left: "$$", right: "$$", display: true},
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{left: "\\[", right: "\\]", display: true},
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{left: "\\(", right: "\\)", display: false}
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]
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```
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- `ignoredTags`: This is a list of DOM node types to ignore when recursing
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through. The default value is
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`["script", "noscript", "style", "textarea", "pre", "code"]`.
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- `errorCallback`: A callback method returning a message and an error stack
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in case of an critical error during rendering. The default uses `console.error`.
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Note that the `displayMode` property of the options object is ignored, and is
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instead taken from the `display` key of the corresponding entry in the
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`delimiters` key.
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