7.0 KiB
Haml.js
High performance JavaScript Haml implementation for nodejs
For a higher quality implementation you may want to look at my Jade template engine, however the syntax is slightly different. Jade's engine may be back-ported to haml.js in the future.
Installation
$ npm install hamljs
node> require('hamljs')
Express
To use with Express and the .haml extension, simply register the engine:
app.engine('.haml', require('hamljs').renderFile);
About
Benchmarks rendering the same 21 line haml file located at benchmarks/page.haml, shows that this library is nearly 65% or 3 times faster than haml-js.
Winner: haml.js
Compared with next highest (haml-js), it's:
65.39% faster
2.89 times as fast
0 order(s) of magnitude faster
Haml.js attempts to comply with the original Haml implementation as well as possible. There are no magic "plugins" like found in other JavaScript haml implementations, for example the following will work just fine:
- if (items)
%ul
- for (var i = 0; i < items.length; ++i)
%li= items[i]
Iteration is the one exception to these magical plugins, since this is ugly in JavaScript, you may also:
- if (items)
%ul
- each item in items
%li= item
Tags
%div text
html:
<div>text</div>
Classes
%div.article.first
article text here
and here
html:
<div class="article first">
article text here and here
</div>
Div Class Shortcut
.comment hey
html:
<div class="comment">hey</div>
Div Id Shortcut
#article-1 foo
html:
<div id="article-1">foo</div>
Combining Ids and Classes
You may chain id and classes in any order:
.article#first.summary content
html:
<div id="first" class="article summary">content</div>
Attributes
%a{ href: 'http://google.com', title: 'Google It' } Google
html:
<a href="http://google.com" title="Google It">Google</a>
Attribute keys such as "for" are automatically quoted by haml.js, so instead of:
%label{ 'for': 'something' }
you should:
%label{ for: 'something' }
which will render:
<label for="something"></label>
Boolean Attributes
%input{ type: 'checkbox', checked: true }
html:
<input type="checkbox" checked="checked"/>
Combining Attributes, Ids, and Classes
Wemay also contain id and classes before or after:
%a.button{ href: 'http://google.com', title: 'Google It' }.first Google
html:
<a href="http://google.com" title="Google It" class="button first">Google</a>
Code
Code starting with a hyphen will be executed but not buffered, where as code using the equals sign will be buffered:
- a = 1
- b = 2
= a + b
html:
3
HTML buffered with equals sign will always be escaped:
= "<br/>"
html:
<br/>
To prevent escaping of HTML entities we can use !=:
!= "<br/>"
html:
<br/>
Iteration
%ul
- each item in items
%li= item
html:
<ul>
<li>one</li>
<li>two</li>
<li>three</li>
</ul>
If you require the key or index of the object or array during iteration simple append a comma following another id:
%ul
- each item, index in items
%li= item + '(' + index + ')'
html:
<ul>
<li>one(0)</li>
<li>two(1)</li>
<li>three(2)</li>
</ul>
Doctypes
Defaults to transitional:
!!!
html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Optionally pass a supported doctype name:
!!! strict
html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
currently supported doctypes, which can be extended simply by adding values to to haml.doctypes.
'5': '<!DOCTYPE html>',
'xml': '<?xml version="1.0" encoding="utf-8" ?>',
'default': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">',
'strict': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">',
'frameset': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">',
'1.1': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">',
'basic': '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">',
'mobile': '<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.2//EN" "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile12.dtd">'
String interpolation
%div Hello #{world}
with locals:
{ world: "World!" }
html:
<div>Hello World!</div>
:cdata
%script
:cdata
foo
html:
<script><![CDATA[
foo
]]></script>
:javascript
%head
:javascript
if (foo)
if (bar)
alert('baz')
html:
<head>
<script type="javascript">
//<![CDATA[
if (foo)
if (bar)
alert('baz')
//]]>
</script>
</head>
Extending Haml
Adding Filters
var haml = require('hamljs')
haml.filters.my_filter = function(str) {
return doSomethingWith(str)
}
by registering the filter function my_filter we can now utilize it within our Haml templates as shown below: %p :my_filter some text here yay whoop awesome
Adding Doctypes
var haml = require('hamljs')
haml.doctypes.foo = '<!DOCTYPE ... >'
Will now allow you to: !!! foo
License
(The MIT License)
Copyright (c) 2011 TJ Holowaychuk <tj@vision-media.ca>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.