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Random Logic l Forum.NET l 20061 AJAX Behind the buzz word Forum.NET ● January 23, 2006
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Random Logic l Forum.NET l 20062 What is Ajax? - Not a technology but a methodology. - A set of technologies being used together in a particular way.
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Random Logic l Forum.NET l 20063 AJAX Which stands for Asynchronous JavaScript and XML which is itself short for... Asynchronous JavaScript XHTML DOM CSS XMLHTTPRequest
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Random Logic l Forum.NET l 20064 AJAX: From another view standards-based presentation using XHTML and CSS; dynamic display and interaction using the Document Object Model; data interchange and manipulation using XML and XSLT; asynchronous data retrieval using XMLHttpRequest; and JavaScript binding everything together.
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Random Logic l Forum.NET l 20065 Is it new? Not really -Hidden frames -Good old JavaScript
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Random Logic l Forum.NET l 20066 So where did it come from? Adaptive Path >> Jesse James Garrett Q. Why did you feel the need to give this a name? A. I needed something shorter than “Asynchronous JavaScript+CSS+DOM+XMLHttpReques t” to use when discussing this approach with clients.
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Random Logic l Forum.NET l 20067 Traditional Web Application Client CSS HTML HTML GET HTML POST DatabaseServer
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Random Logic l Forum.NET l 20068 Traditional Web Application
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Random Logic l Forum.NET l 20069 Breaking the stop start paradigm
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Random Logic l Forum.NET l 200610 AJAX the new generation
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Random Logic l Forum.NET l 200611 AJAX Web Application Client HTML / XHTML XML Data CSS XSL DOM XML HTTP DatabaseServer Controller spans the network Standards based rich internet applications
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Random Logic l Forum.NET l 200612
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Random Logic l Forum.NET l 200613 Why is it popular? Google helped popularize it in GMail Increase Usability of Web Applications Rich Internet Applications without Flash Save Bandwidth Download only data you need Faster interfaces (sometimes) Solves User Frustration
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Random Logic l Forum.NET l 200614 Why is it bad? Breaks back button support URL's don't change as state changes Cross Browser Issues can be a pain Using Ajax for the sake of Ajax Can't access domains other than the calling domain May be disabled (for security reasons) or not available on some browsers Debugging
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Random Logic l Forum.NET l 200615 Browser support Browsers that support Ajax Apple Safari 1.2 and above Konqueror Microsoft Internet Explorer 4.0 and above Mozilla Firefox 1.0 and above Netscape 7.1 and above Opera 7.6 and above
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Random Logic l Forum.NET l 200616 AJAX in the real world
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Random Logic l Forum.NET l 200617 Examples of AJAX GMail Google Maps Google Maps Google Suggest Google Suggest NetVibes NetVibes
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Random Logic l Forum.NET l 200618 XMLHttpRequest A JavaScript Class that lets you make asynchronous HTTP requests from JavaScript Make an HTTP request from a JavaScript event A call back JavaScript function is invoked at each state of the HTTP request and response Native XMLHttpRequest support should be in IE7
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Random Logic l Forum.NET l 200619 XMLHttpRequest Properties onreadystatechange - call back function for state changes readyState - the current state of the HTTP call responseText - the text result of the request responseXML - DOM xml object from the request status - HTTP status code of the response statusText - HTTP status text
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Random Logic l Forum.NET l 200620
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Random Logic l Forum.NET l 200621 A simple example XML file
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Random Logic l Forum.NET l 200622 Ajax.NET – How it works Add reference ajax.dll to your project Modify your web.config to configure IHttpHandler for Ajax.NET requests Write your methods in C#/VB.NET and add the attribute [AjaxMethod] Call Class1.Method1(param1, param2, callback, context); from client-side JavaScript
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Random Logic l Forum.NET l 200623 Demo AJAX.NET
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Random Logic l Forum.NET l 200624 Ajax.NET – Key Benefits Methods only get attribute, no need to implement interface or inherit from class [AjaxMethod] public int GetAge(string username){…} Source-code doesn‘t change if you want to use the method in server-side code DemoMethods dm = new DemoMethods(); int age = dm.GetAge(“michael“);
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Random Logic l Forum.NET l 200625 Ajax.NET – Key Benefits Client-side JavaScript will get “real“ objects from Ajax.NET calls using JSON function test_callback(res) { alert(res.value.FirstName + ‘ ‘ + res.value.FamilyName); } DataSet, DataTable, DataRow, ArrayList, Array, DateTime, TimeSpan, … Create your own IAjaxObjectConverters
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Random Logic l Forum.NET l 200626 Ajax.NET – Key Benefits Cache requests (CacheDurationTimeSpan) Access SessionState objects using HttpContext.Current.Session[…] Unicode support without use of XML parser Use Ajax.NET to retreive “events“ instead of polling
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Random Logic l Forum.NET l 200627 Conclusion AJAX enable more interactive, more responsive, and smarter Web applications. AJAX is not tied to a particular programming language. Remember AJAX has its cons use it wisely.
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Random Logic l Forum.NET l 200628 Questions?
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Random Logic l Forum.NET l 200629 Thank You
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