By Adam Calderon, Joel Rumerman
Server controls are an essential element of each ASP.NET software we construct. They encapsulate browser visual appeal and server performance in a reusable item. they are often used throughout a number of pages inside of a unmarried ASP.NET software in addition to throughout a number of ASP.NET functions. ASP.NET comes with loads of prebuilt server controls. we now have uncomplicated controls corresponding to the label and we now have advanced controls resembling the GridView. We even have the power to create our personal server controls to satisfy a necessity now not met through one of many latest controls through inheriting from the perfect base type and overriding its equipment as needed.
This version of utilizing server controls to encapsulate browser visual appeal and server performance has served our wishes good because the inception of ASP.NET 1.0, yet our server regulate wishes are changing.
A new server keep watch over want that has lately surfaced is the facility to include Ajax performance at once into the server control.
This want arose simply because our net purposes have to be extra responsive and visually interactive than the normal ASP.NET repaint-the-entire-screen version and as a result the conventional server regulate provides. This requirement has emerged simply because clients are utilizing sites resembling Gmail, Live.com, Yahoo! Mail, and others that don't repaint the reveal whenever they click on a button or have to obtain clean facts. particularly, they depend on Ajax to fetch clean info after which replace or upload to a element of the reveal dependent upon that info. simply because those sites are seriously used and clients rather get pleasure from their adventure whereas utilizing those web pages they anticipate different sites to accomplish with a similar splendor as they do. whilst an internet site doesn't practice with an analogous splendor the person will frequently movement onto one other website that does. these well known functions have raised the bar for what's an acceptably ordinary internet site.
Because our clients are hard an internet site event that basically makes use of Ajax and we construct our ASP.NET sites utilizing server controls, we'd like a fashion of simply developing server controls that not just encapsulate browser visual appeal and server performance, but in addition comprise Ajax performance in order that the server keep an eye on itself is Ajax-enabled.
Taking a step again for a second, not like different applied sciences you have learn books on, ASP.NET AJAX server controls don't offer you something that you just couldn't already do. We've continuously been in a position to embed Ajax-functionality into server controls ... it was once only a actual pain.
Furthermore, in case you had a number of server controls that had customer services it was once tricky (but now not most unlikely) to make sure that the buyer capabilities that every server keep an eye on required didn't overwrite one another while rendered at the browser. monitoring down that challenge used to be continuously a enjoyable hour or so.
The trouble grew exponentially if we needed to incorporate a mechanism for asynchronously speaking with the server while the person pressed a button embedded within the server regulate. despite a helper communique library there have been continuously tips to getting your regulate to speak appropriately with the server.
These obstacles have been problematical adequate to guide to a couple undesirable programming behavior and undesirable code in addition to scare programmers clear of even trying to comprise Ajax-functionality of their server controls.
These difficulties are what Microsoft's ASP.NET AJAX solves.
In this e-book, we're going to coach you the way to exploit ASP.NET AJAX to create server controls that encapsulate Ajax performance. ASP.NET AJAX offers either server and consumer programming constructs that make including Ajax-capabilities to our server controls effortless. to not sound cliché, yet with ASP.NET AJAX decreasing the complexity of including Ajax-capabilities to our server controls, we're capable of create server controls whose Ajax services are just restricted by way of our creativity. If we wish to listbox that self-updates with clean info, if we need a type-ahead textbox that dynamically populates from the server, or if we'd like a button submits an handle for verification we will simply accomplish this via ASP.NET AJAX.
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Additional resources for Advanced ASP.NET AJAX Server Controls for .NET Framework 3.5
Strings instanceof instanceof determines whether an object derives from a particular type. This operation can prove useful when programming systems that work with inherited and derived types, but it works only with objects and does not work with the primitive types. 13 demonstrates instanceof in action. 13 instanceof var x = new Date(); alert (x instanceof Date); // alerts true alert (x instanceof Object); // also returns true. As you might expect, x is an instance of a Date and an Object because the Date type derives from Object.
Advanced ASP.NET AJAX Server Controls for .NET Framework 3.5 by Adam Calderon, Joel Rumerman