Building single page, modular html5 applications for PC and Mobile

Building single page, modular
HTML5 applications for PC
and Mobile
Lorant Domokos
Microsoft Student Partners
Fortech

@ itcampro # itcamp12 Premium conference on Microsoft technologies

Mobile &
ITCamp 2012 sponsors Development


Mobile &
Agenda Development

• What are Single Page Applications?
• Architecture
• Technologies
• Knockout fundamentals
• Navigation fundamentals
• Services layer
• Patterns for modular JavaScript code


Mobile &
Spectrum of Web Apps Development

• Static: consist of static HTML pages, CSS, and
images, full page refresh, page does not
change

• Server Rendered: server dynamically
assembles page, JavaScript for validation,
hover, full page refresh


Mobile &
Spectrum of Web Apps Development

• Hybrid Design: similar to server-rendered, but
relies heavily on client side Java-Script to deliver
an engaging experience.

– Islands of richness: islands of interactivity within the
site that do not require full-page reloads to change
the UI

• Single-page Interface: In this model, a full-page
load happens only once. Ex: Hotmail, Office Live.

• Bani Pierduti is hybrid


Mobile &
Modern Web Applications Development

• They are standards-focused, no plugins
• They are interactive
• They limit full-page reloads
• They are asynchronous
• They manage data
• Runs on any device
• Can work offline


Mobile &
Keep user is context Development

• No page reload
• Users are kept in context
• Fluid experience as they navigate from one
task to another
• Result: great user experience


Mobile &
Single Page Applications Development

Rich responsive applications combining the
best of the web and desktop, build with HTML5
and JavaScript


Mobile &
Architecture Development

Server Client

ASP.NET Rendered Page
HTML/CSS/JS HTML/CSS


Mobile &

Server Client


JavaScript Client
Side Interaction


Mobile &

Server Client


Data Service JavaScript Client
JSON/XML Side Interaction

JavaScript Client
Side Interaction


Mobile &

Server Client


JSON/XML Side Interaction Nav

JavaScript Client
Side Interaction


Mobile &

Server Client



JavaScript Client
Side Interaction

Local Storage


Mobile &
Development

DEMO MVC 4 SPA


Mobile &
Bani Pierduti Development


Mobile &
Technologies Development

Server Client


WebAPI
Node.js
JavaScript Client
Side Interaction

Local Storage


Mobile &

Server Client


WebAPI
Node.js
JavaScript Client
Side Interaction

Local Storage HTML5


Mobile &

Server Client


WebAPI
Node.js
JavaScript Client
Side Interaction
Upshot.js?
Amplify.js

Local Storage HTML5


Mobile &

Server Client

Nav.js?
History.js
WebAPI
Node.js
JavaScript Client
Side Interaction
Upshot.js?
Amplify.js

Local Storage HTML5


Mobile &

Server Client Knockout.js
Backbone.js
ASP.NET Rendered Page JsRender
Nav.js?
History.js
WebAPI
Node.js
JavaScript Client
Side Interaction
Upshot.js?
Amplify.js

Local Storage HTML5


Mobile &
Knockout Development

• JavaScript MVVM Framework
• MVVM-Model-View-ViewModel
– Model-business domain objects
– View-visible UI
– ViewModel-data/operations on UI


Mobile &
Knockout Development

• Declarative data bindings, two way
• Automatic UI refresh
• Dependency tracking, if one object changes
all dependent objects change
• Templating


Mobile &
Observables Development

• They are functions
• Bindings observe observables
• Declare: var p = ko.observable();
• Read: var r = p();
• Write: p(„value‟);


Mobile &
Observables Development

• Types:
– Observable: ko.observable(„value‟)
– Observable array: ko.observableArray([])
– Computed:
ko.computed(function() {
return vm.firstName() + „ ‟ + vm.lastName();
}, vm)


Mobile &
Bindings Development

• Built in:
– Text and Appearance
– Forms
– Control Flow
– Templates
• Custom bindings


Mobile &
Text and Appearance Development

• Visible-toggle visibility
• Text-text value of DOM element
• Html-raw HTML of DOM element
• Css-css classes
• Style-raw style attributes
• Attr-any attribute of DOM element


Mobile &
Forms Development

• Click-click event handling
• Event-handling any event of DOM element
• Submit-invoked when form is submitted
• Enable-set as enabled
• Disable-set as disabled
• Value-value of DOM element
• Checked-checkbox, radio button
• Etc.


Mobile &
Control Flow Development

• If-executed if condition is true
• Ifnot-executes if condition is false
• Foreach-executes for each item in collection
– $index
– $data
• With-Executes for the specified child object


Mobile &
Templates Development

• JavaScript templates-traditional JavaScript
template in <script> tag
• Containerless control flow: template-less,
comment based syntax


Mobile &
Navigation and Browser History Development

• Traditional: browser manages history, back
and forward buttons
• URLs can contain a fragment identifier (hash)
– This is the part after the # sign
• Fragment identifier may also contain name
value pairs


Mobile &
Navigation and Browser History Development

• If only the fragment identifier changes the
browser doesn‟t do a page refresh
• They are also not added to history
automatically
• Fragment identifies can be used to manage
screen layout
• Application can handle HTML 5 hashchange
event


Mobile &
Upshot.js Development

• “Proxy” on client side
• Retrieves data from service
• Paging
• Tracks changes
• Offline
• Is it ready?


Mobile &
Amplify.js Development

• Set of components designed to solve
common web application problems with a
simplistic API
• Request management: provides a clean and
elegant request abstraction
• Client Side Browser & Mobile Device Storage:
HTML5 LocalStorage on modern browsers
• Client Side Component Communication:
pub/sub component to component
communication


Mobile &
WebAPI Development

Alessandro Pilotti already demonstrated


Mobile &
Modularity Development

• Patterns are recommended for separation of
concerns, encapsulation, abstraction, etc
• Namespaces: var bp = bp || {};
• Structuring patterns
• Promise and Deferred patterns for handling
asynchrony
• Advanced(Not discussed here):
– Publish/Subscribe for module communication
– Asynchronous module definitions
– jQuery Widgets, Plugins


Mobile &
JavaScript structuring patterns Development

• Prototype pattern
• Module pattern
• Revealing module pattern
• Revealing prototype pattern


Mobile &
Prototype pattern Development

var Calculator = function(element) {
this.eqControl = $(element);
}

Calculator.prototype = {
add: function(x, y) {
var val = x + y;
this.eqControl.text(val);
}
}


Mobile &
Prototype pattern Development

• Pros:
– JS built in features
– Modularize code into reusable objects
– Variables/functions taken out of global
namespace
– Functions loaded into memory once
– Can “override” functions
• Cons:
– “this” can be tricky
– Contstructor separate from prototype definition


Mobile &
Module pattern Development

// Private member.

return {
// Public interface.
var val = x + y;
}
};
}


Mobile &
Module pattern Development

• Pros:
namespace
– Expose only public members, hide private
• Cons:
– Functions will be duplicated for each instance
– Not easy to extend


Mobile &
Revealing Module pattern Development

// Private members.
var
eqControl = $(element),
var val = x + y;
};

return {
// Public interface.
doAdd: add
};
}


Mobile &

• Pros:
namespace
– Expose only public members, hide private
– Cleaner way to expose public members
• Cons:
– Functions will be duplicated for each instance
– Not easy to extend


Mobile &
Revealing Prototype pattern Development

}

Calculator.prototype = function() {
var add = function(x, y) {
var val = x + y;
};

return {
doAdd: add
};
}


Mobile &

• Pros:
– Combines Prototype and Revealing Module
patterns
namespace
– Functions loaded into memory once
– Can “override” functions
• Cons:
– “this” can be tricky
– Contstructor separate from prototype definition


Mobile &
Promise pattern Development

• JavaScript requests/operations are
asynchronous:
– Ajax
– Animations
– Etc.
• How do we link operations if we have
dependencies?


Mobile &
Promise pattern Development

• jQuery.Deferred public API
• defferred.done()
• defferred.fail()
• defferred.then()
• defferred.resolve()
• defferred.reject()
• jQuery.when()


Q&A


Building single page, modular html5 applications for PC and Mobile

Building single page, modular html5 applications for PC and Mobile

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