jquery dojo slides

Client-side technologiesjQuery and Dojo

Jan Holz, Helen Magiera, Yousef Hatem, Michael Schlimnat

Web Technologies – Prof. Dr. Ulrik Schroeder – WS 2010/111The slides are licensed under a

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Overview1. Dojo

1. What is Dojo? Why Dojo?2. How to get Dojo3. Toolkit Overview4. Dojo Demo

2. jQuery1. What is jQuery?2. jQuery UI3. A quick introduction to jQuery4. The ready() function5. Geting started with jQuery: Examples

3. Summery/ Conclusion

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1.1 What is Dojo? Why Dojo? JavaScript Toolkit Makes web development projects easy to realize Save time by spending less effort on the common tasks

spend more time on the really interesting aspects of a web project Some further Reasons:

Big Community Open source software Provides end-to-end solution Portability

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1.2 How to get Dojo Dojo From Google CDN/AOL CDN:

Easy embedding into your website Dojo From Google CDN:

<script src="http://ajax.googleapis.com/ajax/libs/dojo/1.5/dojo/dojo.xd.js" type="text/javascript"></script>

Dojo From AOL CDN: <script src="http://o.aolcdn.com/dojo/1.5/dojo/dojo.xd.js" type="text/javascript"></script>

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1.3 Toolkit Overview

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Dojo

DojoX UtilDijit

Base Core


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Dojo

DojoX UtilDijit

Base Core

Where do I find

what I need?


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Dojo

Base included in the base-level dojo namespace: dojo.js most commonly used

functions


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Dojo

Base Core supplements base with additional

functions call it with dojo.require-fuction: dojo.require("dojo.dnd.Mover"); kinds of features:

• animation machinery: dojo.fx• drag-and-drop facilities: dojo.dnd• data management layer: dojo.data• cookie handling: dojo.cookie• back-button handling: dojo.back• many more


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Dojo

Dijit

Base Core

Library of widgets (short for “Dojo widget”) Out of the box: doesn’t require any

JavaScript at all Widgets created with dijit are ultra-

portable and can be shared onto any web server

Plugging in with dojoType inside of ordinary html-tags

<script type="text/javascript"> dojo.require("dijit.form.Textarea"); </script>...<textarea id="textarea2" name="textarea2" dojoType="dijit.form.Textarea" style="width:200px;"> Blabla </textarea>

Divided into: • general-purpose application widgets

(progress bars, Calendars, …)• layout widgets (tab containers,…)• form widgets (button, input elements,…)


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Dojo

DojoXDijit

Base Core• Area for development of extensions to the

Dojo toolkit • managed by subprojects (each contains

readme.txt)


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Dojo

DojoX UtilDijit

Base Core Contains JavaScript unit-testing framework

tool for creating custom versions of dojo


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Dojo

DojoX UtilDijit

Base Core

1.4 Dojo Demo Huge API, we will introduce only a few

Some clever wrappers for the usual old JS functions

Drag and Drop

Context Menus

Collecting data from data stores

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1.4 Another perspective of searching!

Welcome to Google <3 Dojo website! Relies on Google search engine to get the results. uses Dojo to give the user a rich experience: take a sneak look at

the website, add the search result to favorites bucket, and highlight them using different colors.

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1.4 Dojo Syntactic Sugars Extensions to JavaScript basic functions and constructs

Querying elements flexibly: dojo.query('#foo .bar > h3')

Iteration on elements cannot be easier: dojo.query(“foo").forEach( function(fooTag) {fooTag.disabled =

true; } );

Using signal-slot system to wire up the system dojo.connect(exampleObj, "foo", exampleObj, "bar");

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1.4 Dojo – Fetching Data from a DataStore Dojo introduces a uniform way of accessing data.

dojo.require("dojox.data.GoogleSearchStore");

var search = new dojox.data.GoogleSearchStore();

search.fetch(

{

query: { text: queryText },

count: 20,

onComplete: callback //handles the returned data

}

);

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1.4 Dojo – Fetching Data from a DataStore2

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function callback(items){//string array var strings = new Array();

//put the results in a matrixdojo.forEach(items, function(item){

strings.push("<b>" + search.getValue(item, "title") + "<b><br/><a href=\"" + search.getValue(item, "url") + "\">"+search.getValue(item, "url")+"</a>"); });

//now we have the data stored in strings

}

1.4. Dojo - DnD Dojo offers a very neat cross platform way for drag and drop Define a source, a destination, and Dojo will do the magic!dojo.require("dojo.dnd.Source");

var dragList = new dojo.dnd.Source(“someNode");

var dropList = new dojo.dnd.Target(“someOtherNode");

To add elements to the drag list, simply use insertNodes and according the type to DOM element which the drag list is wrapping, dojo will create the appropriate list element

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1.4. Dojo – Context Menu Dojo offers an easy way to incorporate menus in a website There are so many type of menus that Dojo supportsdojo.require("dijit.Menu");

pMenu = new dijit.Menu();pMenu.addChild(new dijit.MenuItem({label:"Menu Item", onClick:function(){alert (“I am hit!");}));

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2.1 What is jQuery? JavaScript library

makes navigating through HTML and CSS elements easier intuitive Event Handling functionalities animations ajax support

Download jquery.js at jQuery.com include <script type="text/javascript" src="jquery.js"></script> in

the <head>

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2.2 jQuery UI additional low-level interactions

e.g. drag and drop and resize items variety of widgets advanced effects customizable download

select which modules should be downloaded built on top of jQuery

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2.3 A quick introduction to jQuery $ alias for jQuery class

$() constructs a jQuery object (alias for jQuery()) takes css classes and IDs, html elements and XPath expressions as

arguments e.g $(“.myClass”) represents .myClass advantage of jQuery: intuitive element selector functionality don't use document.getElementByID anymore

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2.4 The ready() function Start with this:

$(document).ready(function(){ // put your code here}); or shorter: $(function(){ // your code}); executes the code when DOM is constructed use instead of window.onload = function(){ // executed when page

is loaded}

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2.5 Getting started with jQuery

Enough theory, now we...

use a hover effect change "static" text in realtime introduce some animations code a small jQuery plugin

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2.5 Getting started with jQueryWe have...

...a plain html/css site (bit.ly/jQdemo)

We want...…a clean separation of functionality and structure

We need......the DOM for jQuery to read/manipulate it→ $(document).ready(function() { … });

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2.5 Getting started with jQueryA glimpse of code

$ == jQuery == window.jQuery

$(object).someFunction();

$(object).someFunction($(obj).prevFunction());

$(object1).someFunction(function() { $(object2).nextFunction(); });

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Summary/ Conclusion Both are pretty fast JS-Frameworks Both offer almost the same functionality Dojo offers more fine-grained libraries (dojo.require)→ choose the one you like best

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hover with Dojo:

dojo.query("p").forEach(function(node){ node.onmouseover = function(){ dojo.addClass(node, "red"); } node.onmouseout = function(){ dojo.removeClass(node, "red"); }});

hover with jQuery:

$("p").hover(function() { $(this).addClass("red");},function(){ $(this).removeClass("red");});

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Literature Books: M.A. Russell – Dojo. The definitive Guide Tutorials: http://www.sitepen.com/blog/series/dojo-quick-start-

guide/ Links: http://www.dojotoolkit.org Dojo Official Website, API Documentation:

http://api.dojotoolkit.org/ Dojo.Campus.org

http://dojocampus.org/ Practical Dojo Project, Frank W. Zammetti

APress publications, ISBN-13 (pbk): 978-1-4302-1066-5

1 Introduction

jquery dojo slides

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