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Assets.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Espresso Framework</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="javascripts/jquery.js" type="text/javascript"></script>
<link href="javascripts/bootstrap/css/bootstrap.min.css" rel="stylesheet" />
<link href="javascripts/bootstrap/css/bootstrap-responsive.min.css" rel="stylesheet" />
<script src="javascripts/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
<link href="javascripts/google-code-prettify/prettify.css" type="text/css" rel="stylesheet" />
<script src="javascripts/google-code-prettify/prettify.js" type="text/javascript"></script>
<link href="stylesheets/master.css" type="text/css" rel="stylesheet" />
</head>
<body>
<div class="container">
<div class="row">
<div class="span2">
<a href="index.html">
<img src="images/logo.png" class="pull-right logo" /></a>
</div>
<div class="span6">
<h1>
<a href="index.html">
Espresso Framework</a>
</h1>
<h4>
Scalable Web Framework aimed at Speed and Simplicity
</h4>
</div>
<div class="span pull-right">
<div class="row">
<div class="span">
<h4>
<a href="presentation.html">
Official Presentation</a>
</h4>
<h4 style="white-space: nowrap;">
<a href="Events.html">
Events</a> |
<a href="CHANGELOG.html">
Change Log</a>
</h4>
</div>
</div>
</div>
</div>
<hr/>
<div class="row" style="text-align: center;">
<div class="btn-toolbar">
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Intro.html" class="btn">
Intro</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Intro.html#actions">
Actions</a>
</li>
<li>
<a href="Intro.html#controllers">
Controllers</a>
</li>
<li>
<a href="Intro.html#slices">
Slices</a>
</li>
<li>
<a href="Intro.html#mvc-">
MVC?</a>
</li>
<li>
<a href="Intro.html#models-">
Models?</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Routing.html" class="btn">
Routing</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Routing.html#base-url">
Base URL</a>
</li>
<li>
<a href="Routing.html#canonicals">
Canonicals</a>
</li>
<li>
<a href="Routing.html#actions">
Actions</a>
</li>
<li>
<a href="Routing.html#action-mapping">
Action Mapping</a>
</li>
<li>
<a href="Routing.html#action-aliases">
Action Aliases</a>
</li>
<li>
<a href="Routing.html#parametrization">
Parametrization</a>
</li>
<li>
<a href="Routing.html#format">
Format</a>
</li>
<li>
<a href="Routing.html#restful-actions">
RESTful Actions</a>
</li>
<li>
<a href="Routing.html#rewriter">
Rewriter</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Setup.html" class="btn">
Setup</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Setup.html#global-setup">
Global Setup</a>
</li>
<li>
<a href="Setup.html#setup-by-name">
Setup by Name</a>
</li>
<li>
<a href="Setup.html#setup-by-format">
Setup by Format</a>
</li>
<li>
<a href="Setup.html#remote-setup">
Remote Setup</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Workflow.html" class="btn">
Workflow</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Workflow.html#route">
Route</a>
</li>
<li>
<a href="Workflow.html#params">
Params</a>
</li>
<li>
<a href="Workflow.html#passing-control">
Passing Control</a>
</li>
<li>
<a href="Workflow.html#fetching-body">
Fetching Body</a>
</li>
<li>
<a href="Workflow.html#halt">
Halt</a>
</li>
<li>
<a href="Workflow.html#redirect">
Redirect</a>
</li>
<li>
<a href="Workflow.html#reload">
Reload</a>
</li>
<li>
<a href="Workflow.html#error-handlers">
Error Handlers</a>
</li>
<li>
<a href="Workflow.html#hooks">
Hooks</a>
</li>
<li>
<a href="Workflow.html#authorization">
Authorization</a>
</li>
<li>
<a href="Workflow.html#sessions">
Sessions</a>
</li>
<li>
<a href="Workflow.html#flash">
Flash</a>
</li>
<li>
<a href="Workflow.html#cookies">
Cookies</a>
</li>
<li>
<a href="Workflow.html#content-type">
Content Type</a>
</li>
<li>
<a href="Workflow.html#charset">
Charset</a>
</li>
<li>
<a href="Workflow.html#cache-control">
Cache Control</a>
</li>
<li>
<a href="Workflow.html#expires">
Expires</a>
</li>
<li>
<a href="Workflow.html#last-modified">
Last Modified</a>
</li>
<li>
<a href="Workflow.html#accepted-content-type">
Accepted Content Type</a>
</li>
<li>
<a href="Workflow.html#cache-manager">
Cache Manager</a>
</li>
<li>
<a href="Workflow.html#send-file">
Send File</a>
</li>
<li>
<a href="Workflow.html#send-files">
Send Files</a>
</li>
<li>
<a href="Workflow.html#attachment">
Attachment</a>
</li>
<li>
<a href="Workflow.html#headers">
Headers</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="ViewAPI.html" class="btn">
View API</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="ViewAPI.html#engine">
Engine</a>
</li>
<li>
<a href="ViewAPI.html#extension">
Extension</a>
</li>
<li>
<a href="ViewAPI.html#templates-path">
Templates Path</a>
</li>
<li>
<a href="ViewAPI.html#layouts-path">
Layouts Path</a>
</li>
<li>
<a href="ViewAPI.html#layout">
Layout</a>
</li>
<li>
<a href="ViewAPI.html#rendering-templates">
Rendering Templates</a>
</li>
<li>
<a href="ViewAPI.html#rendering-layouts">
Rendering Layouts</a>
</li>
<li>
<a href="ViewAPI.html#ad-hoc-rendering">
Ad hoc Rendering</a>
</li>
<li>
<a href="ViewAPI.html#path-resolver">
Path Resolver</a>
</li>
<li>
<a href="ViewAPI.html#templates-compilation">
Templates Compilation</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Streaming.html" class="btn">
Streaming</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Streaming.html#server-sent-events">
Server-Sent Events</a>
</li>
<li>
<a href="Streaming.html#websockets">
WebSockets</a>
</li>
<li>
<a href="Streaming.html#chunked-responses">
Chunked Responses</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Assets.html" class="btn">
Assets</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Assets.html#tag-helpers">
Tag Helpers</a>
</li>
<li>
<a href="Assets.html#assets-mapper">
Assets Mapper</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="CRUD.html" class="btn">
CRUD</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="CRUD.html#intro">
Intro</a>
</li>
<li>
<a href="CRUD.html#resource">
Resource</a>
</li>
<li>
<a href="CRUD.html#excluded-params">
Excluded Params</a>
</li>
<li>
<a href="CRUD.html#root">
Root</a>
</li>
<li>
<a href="CRUD.html#response">
Response</a>
</li>
<li>
<a href="CRUD.html#error-handler">
Error Handler</a>
</li>
<li>
<a href="CRUD.html#access-restriction">
Access Restriction</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Deploy.html" class="btn">
Deploy</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Deploy.html#controllers">
Controllers</a>
</li>
<li>
<a href="Deploy.html#slices">
Slices</a>
</li>
<li>
<a href="Deploy.html#roots">
Roots</a>
</li>
<li>
<a href="Deploy.html#run">
Run</a>
</li>
<li>
<a href="Deploy.html#config-ru">
config.ru</a>
</li>
</ul>
</div>
</div>
</div>
<hr/>
<p>Starting with version 0.4, Espresso is using Sprockets to serve assets.</p>
<p>To enable and use this feature, simply call <code>assets_url</code> at app level:</p>
<pre>
app = EApp.new
app.assets_url '/assets'
app.assets.append_path 'assets'
app.run
</pre>
<p><strong>Note:</strong> make sure you have Sprockets installed. Espresso will require and load it automatically.</p>
<p><strong>Note:</strong> Espresso will NOT add any path to Sprockets environment, so it is up to you to do this by using <code>assets.append_path</code> or <code>assets.prepend_path</code>.</p>
<p><strong>Note:</strong> Sprockets environment will use app root(set via <code>root</code> at app level)
as base path, so folders containing assets should reside in your app root.</p>
<pre>
app = EApp.new do
assets_url '/assets'
assets.append_path 'assets'
assets.append_path 'public'
end
app.run
</pre>
<p><code>assets</code> method can be used to fully setup Sprockets environment:</p>
<pre>
app = EApp.new do
assets_url '/assets'
assets.compile = true
assets.compress = false
assets.js_compressor = :uglifier
# etc.
end
app.run
</pre>
<p>To access assets inside controllers/templates, use <code>assets</code> method:</p>
<pre>
class App < E
# ...
def some_action
assets['application.js'] #=> #<Sprockets::BundledAsset ...>
end
end
</pre>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<h2 id='tag-helpers'><a href='#tag-helpers'>Tag Helpers</a></h2>
<p>Espresso offers some useful helpers aimed to easily create HTML tags:</p>
<pre>
js_tag :application
#=> <script src="/assets/application.js" ...
css_tag :application
#=> <link href="/assets/application.css" ...
</pre>
<p>Also helpers for images provided:</p>
<pre><code>- jpg_tag
- jpeg_tag
- png_tag
- gif_tag
- tif_tag
- tiff_tag
- bmp_tag
- svg_tag
- ico_tag
- xpm_tag
- icon_tag
</code></pre>
<p>Tag helpers will use assets URL as prefix:</p>
<pre>
# --- app.rb ---
class App < E
# ...
def index
render
end
end
app = EApp.new do
assets_url '/public'
end
app.run
# --- view/index.erb ---
js_tag :ui
# => <script src="/public/ui.js" ...
png_tag 'images/header'
# => <img src="/public/images/header.png"
</pre>
<p>If you need to load some asset directly, without assets URL prefix, use <code>:src</code> option:</p>
<pre>
js_tag :src => "/jquery"
# => <script src="/jquery.js" ...
css_tag :src => "http://my.cdn/theme"
#=> <link href="http://my.cdn/theme.css" ...
</pre>
<p><strong>Worth to note</strong> that assets mapping can be used without assets being served by Sprockets.</p>
<p>So, when you need to map assets to some URL, so tag helpers will be
automatically prefixed, but you do not need Sprockets,<br>simply set second
argument to <code>false</code> when using <code>assets_url</code>, or its alias - <code>assets_map</code>:</p>
<pre>
app = EApp.new do
assets_url '/assets', false
end
</pre>
<p>Now assets are mapped to "/assets" and you can use tag helpers without
being bothered with Sprockets installation/configuration.</p>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<h2 id='assets-mapper'><a href='#assets-mapper'>Assets Mapper</a></h2>
<p>Sprockets is doing a great job at loading requirements.</p>
<p>But sometimes you need to load assets from templates rather from Sprockets.</p>
<p><code>assets_mapper</code> allow to avoid repetitive path using when loading assets.</p>
<p><strong>Example:</strong> - long way:</p>
<pre>
js_tag 'vendor/jquery'
js_tag 'vendor/bootstrap/js/bootstrap'
css_tag 'vendor/bootstrap/css/bootstrap'
js_tag 'vendor/select2/select2.min'
css_tag 'vendor/select2/select2'
</pre>
<p><strong>Example:</strong> - using <code>assets_mapper</code></p>
<pre>
assets_mapper :vendor do
js_tag 'jquery'
cd 'bootstrap'
js_tag 'js/bootstrap'
css_tag 'css/bootstrap'
cd '../select2'
js_tag 'select2.min'
css_tag 'select2'
</pre>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<hr/>
<footer class="footer well">
<div class="row">
<div class="span4">
<p>
License: MIT
</p>
<p>
Author: Silviu Rusu
</p>
<p>
Source Code:
<a href="https://github.com/espresso/espresso">
https://github.com/espresso/espresso</a>
</p>
</div>
<div class="span6 pull-right">
<p>
Issues/Bugs:
<a href="https://github.com/espresso/espresso/issues">
https://github.com/espresso/espresso/issues</a>
</p>
<p>
<strong>Contributors are very Welcome!</strong>
</p>
<p>
IRC channel: #espressorb on irc.freenode.net
</p>
</div>
</div>
</footer>
</div>
<a href="https://github.com/espresso/espresso"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_gray_6d6d6d.png" alt="Fork me on GitHub"></a>
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