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Ajax Design Patterns
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Ajax, or Asynchronous JavaScript and XML, exploded onto the scene in the spring of 2005 and remains the hottest story among web developers. With its rich combination of technologies, Ajax provides a strong foundation for creating interactive web applications with XML or JSON-based web services by using JavaScript in the browser to process the web server response. Ajax Design Patterns shows you best practices that can dramatically improve your web development projects. It investigates how others have successfully dealt with conflicting design principles in the past and then relays that information directly to you. The patterns outlined in the book fall into four categories: - Foundational technology: Examines the raw technologies required for Ajax development
- Programming: Exposes techniques that developers have discovered to ensure their Ajax applications are maintainable
- Functionality and usability: Describes the types of user interfaces you'll come across in Ajax applications, as well as the new types of functionality that Ajax makes possible
- Development: Explains the process being used to monitor, debug, and test Ajax applications
Ajax Design Patterns will also get you up to speed with core Ajax technologies, such as XMLHttpRequest, the DOM, and JSON. Technical discussions are followed by code examples so you can see for yourself just what is-and isn't-possible with Ajax. This handy reference will help you to produce high-quality Ajax architectures, streamline web application performance, and improve the user experience. Michael Mahemoff holds a PhD in Computer Science and Software Engineering from the University of Melbourne, where his thesis was "Design Reuse in Software Engineering and Human-Computer Interaction." He lives in London and consults on software development issues in banking, health care, and logistics. "Michael Mahemoff's Ajax Design Patterns is a truly comprehensive compendium of web application design expertise, centred around but not limited to Ajax techniques. Polished nuggets of design wisdom are supported by tutorials and real-world code examples resulting in a book that serves not only as an intermediate to expert handbook but also as an extensive reference for building rich interactive web applications."
--Brent Ashley, remote scripting pioneer Customer Review :
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Bulletproof Ajax
Price : $39.99 $23.49
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Step-by-step guide reveals best practices for enhancing Web sites with Ajax - A step-by-step guide to enhancing Web sites with Ajax.
- Uses progressive enhancement techniques to ensure graceful degradation (which makes sites usable in all browsers).
- Shows readers how to write their own Ajax scripts instead of relying on third-party libraries.
Web site designers love the idea of Ajax--of creating Web pages in which information can be updated without refreshing the entire page. But for those who aren't hard-core programmers, enhancing pages using Ajax can be a challenge. Even more of a challenge is making sure those pages work for all users. In Bulletproof Ajax, author Jeremy Keith demonstrates how developers comfortable with CSS and (X)HTML can build Ajax functionality without frameworks, using the ideas of graceful degradation and progressive enhancement to ensure that the pages work for all users. Throughout this step-by-step guide, his emphasis is on best practices with an approach to building Ajax pages called Hijax, which improves flexibility and avoids worst-case scenarios.
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Google Web Toolkit GWT Java AJAX Programming: A step-by-step to Google Web Toolkit for creating Ajax applications fast
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Each chapter covers a series of practical tasks, showing how to achieve a particular useful result – and then learn how it works so that you can apply your knowledge to your own unique situation. Readers will need experience writing non-trivial applications using Java. Experience with developing web interfaces is useful, but knowledge of JavaScript and DHTML is not required… GWT takes care of that!
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AJAX and JavaServer Faces
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Ajax Hacks: Tips & Tools for Creating Responsive Web Sites
Price : $29.99 $2.90
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Ajax, the popular term for Asynchronous JavaScript and XML, is one of the most important combinations of technologies for web developers to know these days. With its rich grouping of technologies, Ajax developers can create interactive web applications with XML-based web services, using JavaScript in the browser to process the web server response. Taking complete advantage of Ajax, however, requires something more than your typical "how-to" book. What it calls for is Ajax Hacks from O'Reilly. This valuable guide provides direct, hands-on solutions that take the mystery out of Ajax's many capabilities. Each hack represents a clever way to accomplish a specific task, saving you countless hours of searching for the right answer. A smart collection of 80 insider tips and tricks, Ajax Hacks covers all of the technology's finer points. Want to build next-generation web applications today? This book can show you how. Among the multitude of topics addressed, it shows you techniques for: - Using Ajax with Google Maps and Yahoo Maps
- Displaying Weather.com data
- Scraping stock quotes
- Fetching postal codes
- Building web forms with auto-complete functionality
Ajax Hacks also features a number of advanced hacks for accelerated web developers. Discover how to create huge, maintainable bookmarklets, how to use client-side storage for Ajax applications, and how to call a built-in Java object from JavaScript using Ajax. The book even addresses best practices for testing Ajax applications and improving maintenance, performance, and reliability for JavaScript code. The latest in O"Reilly's celebrated Hacks series, Ajax Hacks smartly complements other O'Reilly titles such as Head Rush Ajax and JavaScript: The Definitive Guide. Customer Review :
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Questions & Answers
Question : How much does it cost to take the Greyhound bus from Ajax to Ottawa?
I'm looking to go stay in Ottawa during my March Break this year. I currently live in Ajax Ontario [a small town between Pickering and Oshawa] and want to find out if the Greyhound going to Ottawa goes through here. And if so, how much it costs for a round trip ticket. Thanks for the help in advance (:Sincerely,Stefany Synthpop
Answer:
You can catch a Greyhound bus from Ajax to Ottawa for as little as little as $45.50 for a 21-Day Advance Purchase and as much as $83.20 for a Refundable Fare (less if you are a senior citizen, military personnel or student). The trip of 240 Miles will take 7 hours and 39 minutes with 1 transfer according to Greyhound. Good luck and safe travels!
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Question : How to use cURL to get data from a site with delayed Ajax calls?
I am trying to scrape data off a page using php with cURL. However the main content on the page is populated using a delayed ajax called, this means that the data I obtained will not contain the content I need. Is there a way to use cURL to initiate the page load but delay the data return until the AJAX on the remote page completes?
Answer:
AJAX is asynchronous Javascript and XML. The reason the data is not there is that the Javascript program must first run in order to download the data. Therefore, you are asking that cURL process Javascript. cURL does not provide Javscript support.If you wanted to design a solution yourself, you'd essentially write a Javascript compiler. As fun as that sounds, it would be very time consuming.You might be able to manually parse the Javascript to get the URL you need to download and generate it in your programming language of choice. This will require stepping through the Javascript line by line to see how it is retrieving the data.You could write a PHP page that calls cURL code and uses an output buffer to capture the output and manipulate it (look at the php manual page for ob_start and curl). This would require setting up a PHP server and retrieving the results from that page.
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Question : What role does Asynchronous JavaScript play in the AJAX methodology>?
How does AJAX minimize the traffic between the server and client?
Answer:
The whole point of AJAX is that you can update small portions of a web page without getting the entire page from the server. This is achieved through asynchronous HTTP calls to the server and dynamic updates of the HTML DOM. The asynchronicity allows this to happen without the user being blocked from using the web page. It cuts down on traffic because typically less data is moved around during an AJAX call since you are not updating the entire page, just a portion of it.
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Question : Does ajax really help unscratch a scratched wii disc?
I was looking online and it seems ajax (the powder cleaning thing) helps scratched wii discs. Just wanted to know if it really does because i dont want to mess my disc up any more.
Answer:
No. Take better care of your Wii games.
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Question : How does eval parse javascript in Ajax?
After loading ajax tabs that contain calls to a dialog and a function which makes mutually exclusive check boxes. Should the javascript be in the ajax files and be parsed? Or should the javascript be loaded in the head of the main page and be added to it somehow?
Answer:
var result = eval(json); //will run the json code and return the final interpreted value into result.//eg.var json = "Math.floor(8.5)";alert(result = eval(json));==================MyFunction = function() {// my function};AJAX = function() { //get json via ajax var json = "MyFunction()"; try{ exec( json ) } catch( err ) { alert( err ) } //get more json from ajax json = "Num = 1"; var Num = 0; try { alert( eval( json ) ) } catch( err ) { alert( err ) }}======use the xmlhttp object to retrieve json data, don't format your data in xml, and don't parseXML;if you must use xml, then load the xml containing the json, then extract the json portion from the xmldocument, then eval(json)
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Question : What's the best way to transfer a large html page over ajax?
I'm currently making a cms and stuggling to work out why I'm getting the 414 Server Error which means that the URI is too long when I'm using POST to send all my data over via AJAX.If you want the look at the code, please ask.
Answer:
Yes I need to see the code. (You can email me privately if you like.)When using the post method, content is sent by passing it as an argument to the send method, xmlhttp.open("POST","../ajax.php", true);xmlhttp.send("title=" + title + "&page=" + page + "&menu=" + menu + "&content=" + content);
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Question : How to make the back button and refresh button work correctly in AJAX?
I am building a website that uses AJAX and I am having trouble in how to make these buttons work correctly.If you have something to share please reply to this post. Your reply would be much appreciated.
Answer:
You can make these buttons work (more or less) correctly if you update the URL in your JavaScript function every time something happens in your AJAX to specify the state of the page, but you will have to code your server side to recognise the state and start the AJAX processing from there.I.e. normal request to /yourPage.yourExt == /yourPage.yourExt?startFrom=startWhen you get the first response from AJAX you should change your URL to /yourPage.yourExt?startFrom=state1, then /yourPage.yourExt?startFrom=state2...
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Question : What trees would look good in my South Ajax Ontario Yard?
I have just removed a diseased Mountain Ash from my front yard and am looking to replace it with a similar sized tree. We are situated right by lake Ontario, in South Ajax. I think we are about a half zone different from the rest of Ajax as we have the most amazing Pear tree that gives us bushels of fruit every year. I would like the tree to be somewhat ornamental, not just your regular maple or oak.Thanks for your responses.
Answer:
How about one of the Callery Pears.....the ornamental pears....such as Bradford, Aristocrat, Chanticleer, etc? You could also grow a flowering cherry, even the Atumnalis Flowering cherry in addition to the better know Japanese style cherries. Something smaller, how about a hawthorn? Or a redbud? Summer flowering trees are a bit more uncommon but one for you would be Goldenrain tree. Interesting, but plant way in the back of the property because the Red shoulder bug loves these trees. They don't do damage, just hang around. So better away from the house unless you like mobil art as the little guys "hang out."
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Question : How do you make an ajax search suggestion tool like the one on flashlinegames.com?
I know how to make one where only text comes up, but I need to make one that has text and pictures, but I don't think this is possible using ajax. Any suggestions would be appreciated.
Answer:
Why would it not be possible? What if some of the "text" you sent back contained the name (and/or location) of a picture to view? Not all the ajax data that is returned must be rendered in the text box....
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Question : What's the difference between GET and POST AJAX requests?
I've always done GET requests regardless, but I think I should probably look into it :P .The first question is if GET can be used for passwords. I know that it's generally considered best practice to use POST for password forms, but isn't this a bit different? Or am I wrong?Also, are GET requests more readily cached than regular HTTP requests? I know that POST requests are not cached whatsoever, but I've had no problems (thus far) with AJAX-GETs and caching.
Answer:
The difference is the same as any GET v. POST. With GET, the form data is in the URL, with POST it is not.POST only adds negligible security for passwords. You really need to use HTTPS. As for caching, I would expect GET to possibly be cached, but not POST. And of course, HTTPS is never cached.
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