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https://github.com/shannonmoeller/handlebars-layouts
Handlebars helpers which implement layout blocks similar to Jinja, Nunjucks (Swig), Pug (Jade), and Twig.
https://github.com/shannonmoeller/handlebars-layouts
blocks embed handlebars layout layouts nodejs partials templating
Last synced: about 2 months ago
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Handlebars helpers which implement layout blocks similar to Jinja, Nunjucks (Swig), Pug (Jade), and Twig.
- Host: GitHub
- URL: https://github.com/shannonmoeller/handlebars-layouts
- Owner: shannonmoeller
- License: mit
- Created: 2013-07-06T20:21:59.000Z (about 11 years ago)
- Default Branch: master
- Last Pushed: 2019-07-05T10:22:45.000Z (about 5 years ago)
- Last Synced: 2024-05-19T22:01:59.476Z (4 months ago)
- Topics: blocks, embed, handlebars, layout, layouts, nodejs, partials, templating
- Language: JavaScript
- Homepage: http://npm.im/handlebars-layouts
- Size: 409 KB
- Stars: 359
- Watchers: 9
- Forks: 33
- Open Issues: 5
-
Metadata Files:
- Readme: readme.md
- Changelog: CHANGELOG.md
- License: license
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README
# `handlebars-layouts`
[![NPM version][npm-img]][npm-url] [![Downloads][downloads-img]][npm-url] [![Build Status][travis-img]][travis-url] [![Coverage Status][coveralls-img]][coveralls-url] [![Tip][amazon-img]][amazon-url]
Handlebars helpers which implement layout blocks similar to Jade, Jinja, Nunjucks, Swig, and Twig.
## Install
With [Node.js](http://nodejs.org):
$ npm install handlebars-layouts
With [Bower](http://bower.io):
$ bower install shannonmoeller/handlebars-layouts
## API
Helpers are generated by passing in your instance of Handlebars. This allows you to selectively register the helpers on various instances of Handlebars.
### `layouts(handlebars) : Object`
- `handlebars` `Handlebars` - An instance of Handlebars.
Generates an object containing the layout helpers suitible for passing into `registerHelper`.
```js
var handlebars = require('handlebars'),
layouts = require('handlebars-layouts');
handlebars.registerHelper(layouts(handlebars));
```
### `layouts.register(handlebars) : Object`
- `handlebars` `Handlebars` - An instance of Handlebars.
Both generates an object containing the layout helpers and registers them with Handlebars automatically.
```js
var handlebars = require('handlebars'),
layouts = require('handlebars-layouts');
layouts.register(handlebars);
```
## Helpers
### `{{#extend [partial] [context] [key=value ...]}}`
- `partial` `String` - Name of partial to render.
- `context` `Object` _(Optional)_ - A custom context for the partial.
- `attributes` `Object` _(Optional)_ - Arbitrary values that will be added to the partial data context.
Loads a layout partial of a given name and defines block content.
```handlebars
{{#extend "layout" foo="bar"}}
{{#content "title" mode="prepend"}}Example - {{/content}}
{{/extend}}
```
The `{{#extend}}` helper allows you to reason about your layouts as you would class extension where the above is equivalent to the following psuedo code:
```js
class Page extends Layout {
constructor() {
this.foo = 'bar';
}
title() {
return 'Example - ' + super();
}
}
```
### `{{#embed [partial] [context] [key=value ...]}}`
- `partial` `String` - Name of partial to render.
- `context` `Object` _(Optional)_ - A custom context for the partial.
- `attributes` `Object` _(Optional)_ - Arbitrary values that will be added to the partial data context.
Allows you to load a partial which itself extends from a layout. Blocks defined in embedded partials will not conflict with those in the primary layout.
```handlebars
{{#extend "layout"}}
{{#content "body"}}
{{#embed "gallery"}}
{{#content "body"}}
{{/content}}
{{/embed}}
{{#embed "modal" foo="bar" name=user.fullName}}
{{#content "title" mode="prepend"}}Image 1 - {{/content}}
{{#content "body"}}{{/content}}
{{/embed}}
{{/content}}
{{/extend}}
```
The `{{#embed}}` helper allows you to reason about your partials as you would class instantiation where the above is equivalent to the following psuedo code:
```js
class Page extends Layout {
body() {
var gallery = new Gallery();
gallery.replaceBody('\n');
var modal = new Modal({
foo: 'bar',
name: this.user.fullName
});
modal.prependTitle('Image 1 - ');
modal.replaceBody('');
return gallery.toString() + modal.toString();
}
}
```
### `{{#block [name]}}`
- `name` `String` - Block identifier.
Defines a named block, with optional default content. Blocks may have content appended, prepended, or replaced entirely when extending or embedding. You may append and prepend to the same block multiple times.
```handlebars
{{#block "header"}}
Hello World
{{/block}}
{{#block "main"}}
Lorem ipsum...
{{/block}}
{{#block "footer"}}
© 1970
{{/block}}
```
### `{{#content [name] mode="(append|prepend|replace)"}}`
- `name` `String` - Identifier of the block to modify.
- `mode` `String` _(Optional)_ - Means of providing block content. Default: `replace`.
Sets block content, optionally appending or prepending using the `mode` attribute.
Layout:
```handlebars
...
{{#block "header"}}
Hello World
{{/block}}
{{#block "main"}}
Lorem ipsum.
{{/block}}
{{#block "footer"}}
© 1999
{{/block}}
```
Page:
```handlebars
{{#extend "layout"}}
{{#content "header"}}
Goodnight Moon
{{/content}}
{{#content "main" mode="append"}}
Dolor sit amet.
{{/content}}
{{#content "footer" mode="prepend"}}
MIT License
{{/content}}
{{/extend}}
```
Output:
```handlebars
...
Goodnight Moon
Lorem ipsum.
Dolor sit amet.
MIT License
© 1999
```
### Conditional Blocks
There are times where you need to wrap a block with an element or use a different class depending on whether content has been provided for a block. For this purpose, the `content` helper may be called as a [subexpression](http://handlebarsjs.com/expressions.html#subexpressions) to check whether content has been provided for a block.
For example, you may wish to have an optional column in a grid layout:
```handlebars
{{!-- layout.hbs --}}
{{{block "left"}}}
{{#if (content "right")}}
{{{block "right"}}}
{{/if}}
```
For a page that only needs a left column, you may omit defining content for the `right` block:
```handlebars
{{!-- page.html --}}
{{#extend "layout"}}
{{#content "left"}}
Left
{{/content}}
{{/extend}}
```
Resulting in:
```html
Left
```
For a page with two columns, simply define content for both blocks:
```handlebars
{{!-- page.html --}}
{{#extend "layout"}}
{{#content "left"}}
Left
{{/content}}
{{#content "right"}}
Right
{{/content}}
{{/extend}}
```
Resulting in:
```html
Left
Right
```
## Example
### layout.hbs
```handlebars
{{#block "head"}}
{{title}}
{{/block}}
{{#block "header"}}
{{title}}
{{/block}}
{{#block "body"}}
Hello World
{{/block}}
{{#block "footer"}}
© 2013
{{/block}}
{{#block "foot"}}
{{/block}}
```
### page.html
```handlebars
{{#extend "layout"}}
{{#content "head" mode="append"}}
{{/content}}
{{#content "body"}}
Welcome Home
- {{.}}
{{#items}}
{{/items}}
{{/content}}
{{#content "foot" mode="prepend"}}
{{/content}}
{{/extend}}
```
### Putting Them Together
```js
var handlebars = require('handlebars');
var layouts = require('handlebars-layouts');
// Register helpers
handlebars.registerHelper(layouts(handlebars));
// Register partials
handlebars.registerPartial('layout', fs.readFileSync('layout.hbs', 'utf8'));
// Compile template
var template = handlebars.compile(fs.readFileSync('page.html', 'utf8'));
// Render template
var output = template({
title: 'Layout Test',
items: [
'apple',
'orange',
'banana'
]
});
console.log(output);
```
### Output (prettified for readability)
```handlebars
Layout Test
Layout Test
Welcome Home
- apple
- orange
- banana
© 2013
```
## Contribute
Standards for this project, including tests, code coverage, and semantics are enforced with a build tool. Pull requests must include passing tests with 100% code coverage and no linting errors.
## Test
$ npm test
----
MIT © [Shannon Moeller](http://shannonmoeller.com)
[amazon-img]: https://img.shields.io/badge/tip-jar-yellow.svg?style=flat-square
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[coveralls-img]: http://img.shields.io/coveralls/shannonmoeller/handlebars-layouts/master.svg?style=flat-square
[coveralls-url]: https://coveralls.io/r/shannonmoeller/handlebars-layouts
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[npm-img]: http://img.shields.io/npm/v/handlebars-layouts.svg?style=flat-square
[npm-url]: https://npmjs.org/package/handlebars-layouts
[travis-img]: http://img.shields.io/travis/shannonmoeller/handlebars-layouts/master.svg?style=flat-square
[travis-url]: https://travis-ci.org/shannonmoeller/handlebars-layouts