mirror of
https://gitea.com/actions/setup-python.git
synced 2024-11-29 21:49:32 +01:00
168 lines
8.7 KiB
Markdown
168 lines
8.7 KiB
Markdown
[](https://travis-ci.org/wycats/handlebars.js)
|
|
[](https://ci.appveyor.com/project/wycats/handlebars-js)
|
|
[](https://saucelabs.com/u/handlebars)
|
|
|
|
Handlebars.js
|
|
=============
|
|
|
|
Handlebars.js is an extension to the [Mustache templating
|
|
language](http://mustache.github.com/) created by Chris Wanstrath.
|
|
Handlebars.js and Mustache are both logicless templating languages that
|
|
keep the view and the code separated like we all know they should be.
|
|
|
|
Checkout the official Handlebars docs site at
|
|
[http://www.handlebarsjs.com](http://www.handlebarsjs.com) and the live demo at [http://tryhandlebarsjs.com/](http://tryhandlebarsjs.com/).
|
|
|
|
Installing
|
|
----------
|
|
|
|
See our [installation documentation](http://handlebarsjs.com/installation.html).
|
|
|
|
Usage
|
|
-----
|
|
In general, the syntax of Handlebars.js templates is a superset
|
|
of Mustache templates. For basic syntax, check out the [Mustache
|
|
manpage](http://mustache.github.com/mustache.5.html).
|
|
|
|
Once you have a template, use the `Handlebars.compile` method to compile
|
|
the template into a function. The generated function takes a context
|
|
argument, which will be used to render the template.
|
|
|
|
```js
|
|
var source = "<p>Hello, my name is {{name}}. I am from {{hometown}}. I have " +
|
|
"{{kids.length}} kids:</p>" +
|
|
"<ul>{{#kids}}<li>{{name}} is {{age}}</li>{{/kids}}</ul>";
|
|
var template = Handlebars.compile(source);
|
|
|
|
var data = { "name": "Alan", "hometown": "Somewhere, TX",
|
|
"kids": [{"name": "Jimmy", "age": "12"}, {"name": "Sally", "age": "4"}]};
|
|
var result = template(data);
|
|
|
|
// Would render:
|
|
// <p>Hello, my name is Alan. I am from Somewhere, TX. I have 2 kids:</p>
|
|
// <ul>
|
|
// <li>Jimmy is 12</li>
|
|
// <li>Sally is 4</li>
|
|
// </ul>
|
|
```
|
|
|
|
Full documentation and more examples are at [handlebarsjs.com](http://handlebarsjs.com/).
|
|
|
|
Precompiling Templates
|
|
----------------------
|
|
|
|
Handlebars allows templates to be precompiled and included as javascript code rather than the handlebars template allowing for faster startup time. Full details are located [here](http://handlebarsjs.com/precompilation.html).
|
|
|
|
Differences Between Handlebars.js and Mustache
|
|
----------------------------------------------
|
|
Handlebars.js adds a couple of additional features to make writing
|
|
templates easier and also changes a tiny detail of how partials work.
|
|
|
|
- [Nested Paths](http://handlebarsjs.com/#paths)
|
|
- [Helpers](http://handlebarsjs.com/#helpers)
|
|
- [Block Expressions](http://handlebarsjs.com/#block-expressions)
|
|
- [Literal Values](http://handlebarsjs.com/#literals)
|
|
- [Delimited Comments](http://handlebarsjs.com/#comments)
|
|
|
|
Block expressions have the same syntax as mustache sections but should not be confused with one another. Sections are akin to an implicit `each` or `with` statement depending on the input data and helpers are explicit pieces of code that are free to implement whatever behavior they like. The [mustache spec](http://mustache.github.io/mustache.5.html) defines the exact behavior of sections. In the case of name conflicts, helpers are given priority.
|
|
|
|
### Compatibility
|
|
|
|
There are a few Mustache behaviors that Handlebars does not implement.
|
|
- Handlebars deviates from Mustache slightly in that it does not perform recursive lookup by default. The compile time `compat` flag must be set to enable this functionality. Users should note that there is a performance cost for enabling this flag. The exact cost varies by template, but it's recommended that performance sensitive operations should avoid this mode and instead opt for explicit path references.
|
|
- The optional Mustache-style lambdas are not supported. Instead Handlebars provides its own lambda resolution that follows the behaviors of helpers.
|
|
- Alternative delimiters are not supported.
|
|
|
|
|
|
Supported Environments
|
|
----------------------
|
|
|
|
Handlebars has been designed to work in any ECMAScript 3 environment. This includes
|
|
|
|
- Node.js
|
|
- Chrome
|
|
- Firefox
|
|
- Safari 5+
|
|
- Opera 11+
|
|
- IE 6+
|
|
|
|
Older versions and other runtimes are likely to work but have not been formally
|
|
tested. The compiler requires `JSON.stringify` to be implemented natively or via a polyfill. If using the precompiler this is not necessary.
|
|
|
|
[](https://saucelabs.com/u/handlebars)
|
|
|
|
Performance
|
|
-----------
|
|
|
|
In a rough performance test, precompiled Handlebars.js templates (in
|
|
the original version of Handlebars.js) rendered in about half the
|
|
time of Mustache templates. It would be a shame if it were any other
|
|
way, since they were precompiled, but the difference in architecture
|
|
does have some big performance advantages. Justin Marney, a.k.a.
|
|
[gotascii](http://github.com/gotascii), confirmed that with an
|
|
[independent test](http://sorescode.com/2010/09/12/benchmarks.html). The
|
|
rewritten Handlebars (current version) is faster than the old version,
|
|
with many [performance tests](https://travis-ci.org/wycats/handlebars.js/builds/33392182#L538) being 5 to 7 times faster than the Mustache equivalent.
|
|
|
|
|
|
Upgrading
|
|
---------
|
|
|
|
See [release-notes.md](https://github.com/wycats/handlebars.js/blob/master/release-notes.md) for upgrade notes.
|
|
|
|
Known Issues
|
|
------------
|
|
|
|
See [FAQ.md](https://github.com/wycats/handlebars.js/blob/master/FAQ.md) for known issues and common pitfalls.
|
|
|
|
|
|
Handlebars in the Wild
|
|
----------------------
|
|
|
|
* [Assemble](http://assemble.io), by [@jonschlinkert](https://github.com/jonschlinkert)
|
|
and [@doowb](https://github.com/doowb), is a static site generator that uses Handlebars.js
|
|
as its template engine.
|
|
* [Cory](https://github.com/leo/cory), by [@leo](https://github.com/leo), is another tiny static site generator
|
|
* [CoSchedule](http://coschedule.com) An editorial calendar for WordPress that uses Handlebars.js
|
|
* [dashbars](https://github.com/pismute/dashbars) A modern helper library for Handlebars.js.
|
|
* [Ember.js](http://www.emberjs.com) makes Handlebars.js the primary way to
|
|
structure your views, also with automatic data binding support.
|
|
* [Ghost](https://ghost.org/) Just a blogging platform.
|
|
* [handlebars_assets](http://github.com/leshill/handlebars_assets): A Rails Asset Pipeline gem
|
|
from Les Hill (@leshill).
|
|
* [handlebars-helpers](https://github.com/assemble/handlebars-helpers) is an extensive library
|
|
with 100+ handlebars helpers.
|
|
* [handlebars-layouts](https://github.com/shannonmoeller/handlebars-layouts) is a set of helpers which implement extendible and embeddable layout blocks as seen in other popular templating languages.
|
|
* [hbs](http://github.com/donpark/hbs): An Express.js view engine adapter for Handlebars.js,
|
|
from Don Park.
|
|
* [koa-hbs](https://github.com/jwilm/koa-hbs): [koa](https://github.com/koajs/koa) generator based
|
|
renderer for Handlebars.js.
|
|
* [jblotus](http://github.com/jblotus) created [http://tryhandlebarsjs.com](http://tryhandlebarsjs.com)
|
|
for anyone who would like to try out Handlebars.js in their browser.
|
|
* [jQuery plugin](http://71104.github.io/jquery-handlebars/): allows you to use
|
|
Handlebars.js with [jQuery](http://jquery.com/).
|
|
* [Lumbar](http://walmartlabs.github.io/lumbar) provides easy module-based template management for
|
|
handlebars projects.
|
|
* [Marionette.Handlebars](https://github.com/hashchange/marionette.handlebars) adds support for Handlebars and Mustache templates to Marionette.
|
|
* [sammy.js](http://github.com/quirkey/sammy) by Aaron Quint, a.k.a. quirkey,
|
|
supports Handlebars.js as one of its template plugins.
|
|
* [SproutCore](http://www.sproutcore.com) uses Handlebars.js as its main
|
|
templating engine, extending it with automatic data binding support.
|
|
* [YUI](http://yuilibrary.com/yui/docs/handlebars/) implements a port of handlebars
|
|
* [Swag](https://github.com/elving/swag) by [@elving](https://github.com/elving) is a growing collection of helpers for handlebars.js. Give your handlebars.js templates some swag son!
|
|
* [DOMBars](https://github.com/blakeembrey/dombars) is a DOM-based templating engine built on the Handlebars parser and runtime **DEPRECATED**
|
|
* [promised-handlebars](https://github.com/nknapp/promised-handlebars) is a wrapper for Handlebars that allows helpers to return Promises.
|
|
* [just-handlebars-helpers](https://github.com/leapfrogtechnology/just-handlebars-helpers) A fully tested lightweight package with common Handlebars helpers.
|
|
|
|
External Resources
|
|
------------------
|
|
|
|
* [Gist about Synchronous and asynchronous loading of external handlebars templates](https://gist.github.com/2287070)
|
|
|
|
Have a project using Handlebars? Send us a [pull request][pull-request]!
|
|
|
|
License
|
|
-------
|
|
Handlebars.js is released under the MIT license.
|
|
|
|
[pull-request]: https://github.com/wycats/handlebars.js/pull/new/master
|