Download Advanced ASP.NET AJAX Server Controls for .NET Framework 3.5 by Adam Calderon, Joel Rumerman PDF

By Adam Calderon, Joel Rumerman

Server controls are an indispensable point of each ASP.NET program we construct. They encapsulate browser visual appeal and server performance in a reusable item. they are often used throughout a number of pages inside 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've got basic controls akin to the label and we have now advanced controls equivalent to the GridView. We even have the facility to create our personal server controls to fulfill a necessity now not met via one of many present controls by way of inheriting from the right base type and overriding its tools 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 keep an eye on wishes are changing.

A new server regulate desire that has lately surfaced is the power to include Ajax performance at once into the server control.

This desire arose simply because our internet purposes must be extra responsive and visually interactive than the normal ASP.NET repaint-the-entire-screen version and hence the conventional server regulate provides. This requirement has emerged simply because clients are utilizing sites comparable to Gmail, Live.com, Yahoo! Mail, and others that don't repaint the monitor whenever they click on a button or have to obtain clean information. fairly, they depend on Ajax to fetch clean info after which replace or upload to a component of the display dependent upon that facts. simply because those sites are seriously used and clients relatively take pleasure in their adventure whereas utilizing those web pages they anticipate different websites to accomplish with an analogous beauty as they do. whilst a website doesn't practice with an analogous splendor the person will frequently flow onto one other site that does. these renowned functions have raised the bar for what's an acceptably straight forward internet site.

Because our clients are tough a website adventure that primarily makes use of Ajax and we construct our ASP.NET sites utilizing server controls, we want a fashion of simply growing server controls that not just encapsulate browser visual appeal and server performance, but in addition contain Ajax performance in order that the server keep watch over itself is Ajax-enabled.

Taking a step again for a second, in contrast to different applied sciences you have learn books on, ASP.NET AJAX server controls don't offer you whatever that you simply couldn't already do. We've continually been capable of embed Ajax-functionality into server controls ... it was once only a genuine pain.

There have been a number of diversified equipment lets use to incorporate the JavaScript with our server keep an eye on comparable to embedding it as a source, yet we finally ended up having to do a similar 3 projects. To make our server keep watch over have a few severe customer services we constantly needed to concatenate strings jointly to shape JavaScript statements and services, write browser sniffing statements to ensure that the JavaScript was once cross-browser appropriate, and upload attributes or render out Html that connected the JavaScript performance to the buyer models of our server controls. It wasn't most unlikely, however it was once error-prone and there has been consistently this mingling of server code and JavaScript that used to be difficult to keep up or even tougher to read.

Furthermore, for those who had a number of server controls that had purchaser functions it used to be tough (but now not very unlikely) to make sure that the customer features that every server keep an eye on required didn't overwrite one another whilst rendered at the browser. monitoring down that challenge used to be regularly a enjoyable hour or so.

The trouble grew exponentially if we would have liked to incorporate a mechanism for asynchronously speaking with the server whilst the consumer pressed a button embedded within the server keep watch over. inspite of a helper conversation library there have been continuously tips to getting your keep an eye on to speak competently with the server.

These obstacles have been frustrating sufficient to steer to a few undesirable programming conduct and undesirable code in addition to scare programmers clear of even trying to contain Ajax-functionality of their server controls.

These difficulties are what Microsoft's ASP.NET AJAX solves.

In this booklet, we're going to educate you the way to take advantage of ASP.NET AJAX to create server controls that encapsulate Ajax performance. ASP.NET AJAX presents either server and patron programming constructs that make including Ajax-capabilities to our server controls effortless. to not sound cliché, yet with ASP.NET AJAX lowering the complexity of including Ajax-capabilities to our server controls, we're in a position to create server controls whose Ajax services are just restricted by means of our creativity. If we wish to listbox that self-updates with clean facts, if we'd like a type-ahead textbox that dynamically populates from the server, or if we'd like a button submits an tackle for verification we will simply accomplish this via ASP.NET AJAX.

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Extra info for Advanced ASP.NET AJAX Server Controls for .NET Framework 3.5

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Expando properties tend to be slow performing when compared to custom objects; so although they have some useful purposes, their use should be limited to those situations where you have no choice but to use them. Instead, you should use the custom object technique we cover in the “ObjectOriented JavaScript Programming” section of this chapter. print = null; This is useful, but if we iterate over this object using the for…in loop, print will still be included in the loop. print; Deleting a property removes it from the object so that it will no longer be returned from the for…in loop, and if accessed, it returns undefined.

15 16 Chapter 1: Programming with JavaScript TIP constructor Property of Primitive Data Types Because the primitive data types don’t inherit from Object, you might be wondering what’s returned when we examine their constructor properties. Well, at least in Internet Explorer 7 and Firefox, the wrapper object’s constructor that’s associated to each primitive data type is returned. It seems that even when attempting to access the constructor property, JavaScript casts the primitive types to their wrapper objects.

27 demonstrates this idea; we implement a factorial function through recursion, which relies on an anonymous function to perform the factorial work. caller caller is another property that might be available on the local arguments variable. It refers to the method that called the currently executing method. caller, use it carefully. this this in JavaScript points to the current owner of the executing method. It functions much like this in C# and can point to the global window object if the executing method is procedural, a DOM element if the executing method is handling a DOM event, or an object if the executing method is contained within the object’s definition.

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