SPA single page application
DocumentCloud's Backbone.js Underscore.js LAB.js and jQuery
templating to name but a few.
is a three-level bookmarkable image gallery.
Dustin Diaz's CacheProvider
JSDoc Toolkit
SPAs are web applications or websites which persistenly run in the same page
without requiring a reload fr futher navigation.
All of the code needed for your initial load in these applications is driven b
by eiter local data or data rtrieved from a web server on demand , such as
any additional data required from hyour app that might be driven by uer acions
The basic idea behind an SPA is that regardless of whatinteractions your users might have with the application
Why better than Multi-pageApplications
SPAs typically contrast from classical
page hanges are regular and the browser is oftern asked to fetch new content from the server and thn reload to fulfil user requests.
is a way of disrupting the user experience quite ba
changes of application state re handled using approachs such as
XHR calls, making the user experience a lot more
fluid.
consider the idea of state sequence to be equivlent to the concept o pages. Apartical change
implies a change of state in the same way a change of navigation
in a server-side app results in a change of page
How Will Today's App Approach SEO, Hash Routing
and Graceful Degradation?
In today's tutorial, we'll be leveraging the jQuery templating plugin to handle rendering our Backbone
views ad using hash-based routing for the URLs;
normally, without any additional work done , this would
simply result in a blank pag being visible to both search bots and users
with JS switched off.
So, how do we handle SEO hen bots don;t correctly follow JS powered routes?
How do we also provide an experience for users with JS copletly diabled In
my opinion the solution to hash-bang/based URLs and
graceful degradatio lie in the same basket.
Backbone.js and Underscore.js
Collections
Ordeed Sets of Models Views Render HTML/css wth JS ttemplating
Models
Interactive Data Domain-specific methods Controllers Methods For Routing URL Fragments
a structure fro your cde where you don't have to tie data so heavily to the DOM
Anoher userful feature is that whn your Backbone models change, te views representing the underlying data
can be notified ,, causing tem to re-render.
Well it's basically a utility-belt library that provides a lot of the functional support that you would expect in something like Ruby each, map, isEmpty isElement and more
Going bac toBackbone views can be created by extending Bacbone view and passing in options models collections etc . You can als specify a render function on the view to set it up with templating
Client-Side Templating with the jQuery Templating Pluin
create simple client-side teplates that are easily re-usable where templates are written in HTML withtemplate tags whist jQUery code is used for performing the actual data poluplation
var albums = [
{Title:"My Vacation In Malibu", AlbumYear:"1993"},
{Title:"A Trip To the Sea-side", AlbumYear:"1992"}
];
var template_markup = "
<ul>
<li><b>${Title}</b>(${AlbumYear})</li>
<ul>
";
$.template("albumTemplate",template_markup);
$.tmpl("albumTemplate",albms).appendTo("#albumList")
LAB.js Asynchronous Script Loading
Kyle Simpson's LABjs Loading And Blocking JavaScript is a great general purpose scrit loader hic allows you to load Scripts in parallel as the browser allows.
.wait() in your chain .
$LAB
.script("jquery.js").wait()
.script("")
.script("relies.onabove.depenccy.js").wait()
.script("app.js");
Today's Single-Page MVC Gallery Appliation
Introduction
Backbone will be used to provide a taste of MVC
architecture to the ap,Underscore for it's utility functions
LAB.js for asynchronous script loadig and the
Data caching is something that can ofter be gnored in tutorials about
client-side app developmnt, CacheProvder which allow you to cache data both in memory and using localStorage it it's available.
organize your interface into logical views,
backed by models, each o whih can be updated independently when the model changes, without having to redraw the page.
<pde;s defined using Backbone.Model contan the interacitve data and logc around the information being used in our application For the g Photo to reperent the data around the image entries.
Backbone.Collection allos you to define ordered sets of models which can bid change eventsto the notified wen models in a collection are nmodified
PhotoCollection
IndexView, SubalbumView PhotoView