168 lines
4.6 KiB
Markdown
168 lines
4.6 KiB
Markdown
# Highlight.js
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Highlight.js highlights syntax in code examples on blogs, forums and,
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in fact, on any web page. It's very easy to use because it works
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automatically: finds blocks of code, detects a language, highlights it.
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Autodetection can be fine tuned when it fails by itself (see "Heuristics").
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## Basic usage
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Link the library and a stylesheet from your page and hook highlighting to
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the page load event:
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```html
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<link rel="stylesheet" href="styles/default.css">
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<script src="highlight.pack.js"></script>
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<script>hljs.initHighlightingOnLoad();</script>
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```
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This will highlight all code on the page marked up as `<pre><code> .. </code></pre>`.
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If you use different markup or need to apply highlighting dynamically, read
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"Custom initialization" below.
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- You can download your own customized version of "highlight.pack.js" or
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use the hosted one as described on the download page:
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<http://highlightjs.org/download/>
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- Style themes are available in the download package or as hosted files.
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To create a custom style for your site see the class reference in the file
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[classref.txt][cr] from the downloaded package.
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[cr]: http://github.com/isagalaev/highlight.js/blob/master/classref.txt
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## node.js
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Highlight.js can be used under node.js. The package with all supported languages is
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installable from NPM:
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npm install highlight.js
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Alternatively, you can build it from the source with only languages you need:
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python3 tools/build.py -tnode lang1 lang2 ..
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Using the library:
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```javascript
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var hljs = require('highlight.js');
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// If you know the language
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hljs.highlight(lang, code).value;
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// Automatic language detection
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hljs.highlightAuto(code).value;
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```
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## AMD
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Highlight.js can be used with an AMD loader. You will need to build it from
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source in order to do so:
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```bash
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$ python3 tools/build.py -tamd lang1 lang2 ..
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```
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Which will generate a `build/highlight.pack.js` which will load as an AMD
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module with support for the built languages and can be used like so:
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```javascript
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require(["highlight.js/build/highlight.pack"], function(hljs){
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// If you know the language
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hljs.highlight(lang, code).value;
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// Automatic language detection
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hljs.highlightAuto(code).value;
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});
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```
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## Tab replacement
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You can replace TAB ('\x09') characters used for indentation in your code
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with some fixed number of spaces or with a `<span>` to give them special
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styling:
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```html
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<script type="text/javascript">
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hljs.tabReplace = ' '; // 4 spaces
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// ... or
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hljs.tabReplace = '<span class="indent">\t</span>';
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hljs.initHighlightingOnLoad();
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</script>
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```
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## Custom initialization
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If you use different markup for code blocks you can initialize them manually
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with `highlightBlock(code, tabReplace, useBR)` function. It takes a DOM element
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containing the code to highlight and optionally a string with which to replace
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TAB characters.
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Initialization using, for example, jQuery might look like this:
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```javascript
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$(document).ready(function() {
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$('pre code').each(function(i, e) {hljs.highlightBlock(e)});
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});
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```
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You can use `highlightBlock` to highlight blocks dynamically inserted into
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the page. Just make sure you don't do it twice for already highlighted
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blocks.
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If your code container relies on `<br>` tags instead of line breaks (i.e. if
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it's not `<pre>`) pass `true` into the third parameter of `highlightBlock`
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to make highlight.js use `<br>` in the output:
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```javascript
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$('div.code').each(function(i, e) {hljs.highlightBlock(e, null, true)});
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```
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## Heuristics
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Autodetection of a code's language is done using a simple heuristic:
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the program tries to highlight a fragment with all available languages and
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counts all syntactic structures that it finds along the way. The language
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with greatest count wins.
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This means that in short fragments the probability of an error is high
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(and it really happens sometimes). In this cases you can set the fragment's
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language explicitly by assigning a class to the `<code>` element:
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```html
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<pre><code class="html">...</code></pre>
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```
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You can use class names recommended in HTML5: "language-html",
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"language-php". Classes also can be assigned to the `<pre>` element.
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To disable highlighting of a fragment altogether use "no-highlight" class:
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```html
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<pre><code class="no-highlight">...</code></pre>
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```
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## Export
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File export.html contains a little program that allows you to paste in a code
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snippet and then copy and paste the resulting HTML code generated by the
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highlighter. This is useful in situations when you can't use the script itself
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on a site.
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## Meta
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- Version: 7.5
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- URL: http://highlightjs.org/
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For the license terms see LICENSE files.
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For authors and contributors see AUTHORS.en.txt file.
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