This document discusses how to use the YUI JavaScript library to build websites and manipulate web pages. Key points include: - YUI allows fetching data from remote sources, interacting with YQL, and using pre-built UI widgets. - Examples show how to make HTTP requests, select page elements, add and remove content, and fade elements in/out. - YUI can be used to create website templates with grids, manipulate pages using CSS selectors, and change styling of elements.

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2. Using YUI to get things done
Natarajan Kannan
Web Developer
twitter: @knutties
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3. Demo time
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4. Overview
• YUI is a Javascript/CSS library
• Highly modular, extensible and heavily
documented
• Lets you do a lot with less code
• Very suitable for hacks
• Probably the only javascript library that comes
with its own package management
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5. What can you do with YUI?
• Create websites/templates
• Manipulate web pages easily
• Fetch data from remote sources
• Interact with YQL
• Use pre­built UI widgets
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6. Creating website templates
• First task in creating a website
– select a layout
• YUI CSS grids builder
– Interface to create layout
– http://developer.yahoo.com/yui/grids/builder/
• Default CSS styling with YUI base
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7. Manipulate web pages
• Locate elements on web pages
– Using CSS selectors
• Update portions of web pages
– By adding/removing/changing content
• Change styling of elements
– hide/resize/overlay elements
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8. Examples – Using Simple YUI
// get an element reference, add a click handler
Y.one('#demo').on('click', function(e) {/*handle
click*/});
// add content to an element
Y.one('#demo').append(" Additional content added to
#demo.");
// move #demo to the location of any click on the
document
Y.one('document').on('click', function(e) {
Y.one('#demo').setXY([e.pageX, e.pageY]);
}
);
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9. Examples – Using Simple YUI
// fade #demo off to full opacity, then remove it from
the dom:
Y.one('#demo').transition({
easing: 'ease­out',
duration: 2, // seconds
opacity: 0
}, function() {
this.remove();
});
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10. Fetch data from remote sources
• Allows you to fetch data from different sources
– Local functions
– Remote sources over http
• Helps you work around cross­domain restrictions
• Y.io and Y.DataSource are your friends
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11. Examples – Using Simple YUI
// Make an HTTP request to 'get.php'.
Y.io('get.php', {
on: {
complete: function (id, response) {
var id = id, // Transaction ID.
data = response.responseText; // Response
data.
// ... handle the response ...
}
}
});
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12. YUI makes YQL very easy
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13. Examples – Using stock YUI 3
YUI().use('yql', function(Y) {
Y.YQL('select * from weather.forecast where
location=90210', function(r) {
// r now contains the result of the YQL Query
// use the YQL Developer console to learn
// what data is coming back in this object
// and how that data is structured.
});
});
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14. Using pre­built UI widgets – YUI 3
• YUI 3 (default)
– Overlays
– Sliders
– Tab views
– Rich Text Editor
• YUI 3 (gallery)
– Accordion
– Tree view
– Resize
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15. Using pre­built UI widgets – YUI 2
• YUI 2 (default)
– Overlays
– Sliders
– Tab views
– Rich Text Editor
– Image Cropper
– Image loader
– Progress bar
– Tree view
– Charts
– Colour picker
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16. YUI with Greasemonkey
• Greasemonkey lets you add functionality to
existing web pages
– http://diveintogreasemonkey.org/
• YUI 3 with greasemonkey
– http://blog.davglass.com/files/yui3/greasemonkey/
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17. Choosing your YUI
• Simple YUI (based on YUI 3)
– Start fast
– Basic AJAX and DOM manipulation
– http://ericmiraglia.com/yui/demos/quickyui.php
• YUI 3
– Performance
– Sand­boxing
• YUI 2
– For its widget collection
– If you are already used to it
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18. Links for you
• http://developer.yahoo.com/yui/3/
• http://developer.yahoo.com/yui/3/examples/
• http://yuilibrary.com/gallery/
• http://developer.yahoo.com/yui/2
• http://blog.davglass.com/files/yui3/greasemonkey
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