a walk on the seaside - rmll2008.rmll.info/img/pdf/ducasse-awalkontheseaside-28.pdf · s. ducasse,...

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A Walk on the

SeasideFrom L. Renggli’s slides

S. Ducassewww.seaside.st

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Who cares about?

Client Server

Web Browser

Web Server

Request

Response

HTTP Protocol

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Introduction

Features

Examples

Applications

References

Questions

Outline – Seaside 2.8

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A First Example

1

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<p> <% value1 + value2 %></p>

Common Approach<form action="second.html"> <input type="text" name="value1"> <input type="submit" value="OK"></form>

<form action="result.html"> <input type="text" name="value2"> <input type="submit" value="OK"></form>

<form action="result.html"> <input type="hidden" name="value1" value="<% value1 %>" > <input type="text" name="value2"> <input type="submit" value="OK"></form>

first

.htm

lse

cond

.htm

lre

sult.

htm

l

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valu

e1, v

alue

2

/result

processing

formatting

resu

lt

.../second

processing

formattingva

lue1

valu

e1

Other Problems

/firstformatting

User with Web Browser

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With Seaside

| value1 value2 |

Ask for first numbervalue1 := self request: ‘First Number’.

Ask for second numbervalue2 := self request: ‘Second Number’.

Show sum of first and second number self inform: value1 asNumber + value2 asNumber.

Client Server

Span Window

Back Button 2

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Seaside FeaturesFlow of applications: a continuous piece of code. Just plain Smalltalk

XHTML/CSS building

Component with state

Callback based event-model

Component Composition and Reuse

Web 2.0

Secure

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Tools

Development tools

Interactive debugging

On the fly recompilation

Code Refactoring

Server and client testing frameworks

9

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XHTML CSS2

Developer & Seaside Graphics Designer

User Interface Design

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User Interface Designhttp://www.csszengarden.com

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XHTML Building

html divNamed: ‘title’ with: ‘Titel’.html divNamed: ‘list’ with: [ html spanClass: ‘item’ with: ‘Item 1’. html spanClass: ‘item’ with: ‘Item 2’. ].

<div id=“title”>Title</div><div id=“list”> <span class=“item”>Item 1</span> <span class=“item”>Item 2</span></div>

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Callback Event ModelExample3>>renderContentOn: html html form: [ htmlsubmitButton callback: [ self inform: ‘Hello’ ] text: ‘Say Hello’ ].

<form method="post" action="/seaside/example2"> <input name="_s" value="WwaXKYdGNmGxCoiy" type="hidden" /> <input name="_k" value="EUCelKJU" type="hidden" /> <input value="Say Hello" name="1" type="submit" /></form>

3

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Callback Event ModelEnhance previous example

Ask for usernameAnswer the username

Enabling halosEditing code on the run

4

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Storing into model

Example4>>renderContentOn: html

html form: [ html text: ‘Username:’. html textInput callback: [ :value | username := value ]. html submitButton callback : [ self inform: ‘Hi ’ , username ] text: ‘Say Hello’. ].

15

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CompositionExample4>>initialize self children: { WACounter new. WAExample1 new. WAExample2 new. WAExample3 new. WAExample4 new. WAExample4 new. }.

Example4>>renderContentOn: html self children do: [ :each | html render: each ] separatedBy: [ html break ].

5

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Call / AnswerComponents (Web Browser)

B>>bar self answer: 77.B

Server (Source Code)

A>>foo x := self call: B . x asString.

A

A>>foo x := self call: B . x printString. -> 77

A

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Reuse

TabsFormsDialogsWizardsReportsBatchesCharts...

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Halos revisitedInspecting component modelInspecting XHTML sourceEditing stylesheet (CSS)

Debugging

19

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Applicationsnetstyle.ch

Insurance Application

Business Card Editor

Collaborative Team Management

Source Code Management

Others

Ticketing for Theaters

Booking System for Airlines

Content Management Systems

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Example: DomainHealth insurance

Little company with agencies

Requirements

Create and manage offers

Print and create PDF documents

Process of accepting new policies

Mange existing customers

Billing for agencies

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Example: ConfigurationApplication

Seaside

Apache

PostgreSQL

File System

Sque

ak

SSH

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Availability

Open Source: MIT License

Environments

Squeak (MIT)

GNU Smalltalk

Cincom VisualWorks

Gemstone

VisualAge

http://www.seaside.st

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Abstraction

Request / Response

Session Management

Composition and Reuse

Development

Smalltalk

Web-Tools

RequestResponse

Server

Client

Conclusion

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References

http://www.seaside.st/

Free seaside hosting

Support for Ajax and Web2.0

scriptaculous.seasidehosting.st/

http://seachart.seasidehosting.st/

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