Beginning Ajax with ASP.NET by Wallace B. McClure

By Wallace B. McClure

Following an exploration of ways Ajax works with .NET, you will get accustomed to DHTML, the function of JavaScript and the record item version, and the XMLHttpRequest item, that's the root of Ajax. then you definately will study the Ajax-type gains equipped into ASP.NET and discover the Ajax.NET specialist Library intimately. eventually, you'll discover consumer scripting in addition to construction and utilizing controls with Microsoft's Atlas. With a whole bankruptcy dedicated to debugging, you have all you should utilize this state-of-the-art know-how.

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Additional chapters will look at the other technologies that make up Ajax. NET library, Microsoft Atlas, and finally tips and tricks on debugging client-side applications. info 2 Introduction to DHTML Dynamic HTML (DHTML) is a combination of three technologies: Hypertext Markup Language (HTML), Cascading Style Sheets (CSS), and JavaScript. With these technologies, the content in a browser becomes dynamic, not having to rely on time-consuming updates from round trips back to the server. Additionally, finer control over the user experience is available by leveraging the various events inherent in HTML, such as playing a small sound when the mouse moves over an image or providing custom context menus instead of the standard one provided by the browser.

Status=’It\’s a beautiful day’;” oncontextmenu=”contextMenuClick(); return false;”> And as you may have guessed, the return false; statement bypasses the normal behavior of this event handler, which would bring up the browser’s context menu. clientY properties give the x and y coordinates of the exact location of the mouse during the click. So, when you render the page and rightclick somewhere, the status menu shows those x and y coordinates. You can put that information to work by using the coordinates to place a


Layers. Fortunately, a common method on the document object now enables you to search through a web page and find any object by its ID anywhere on the page: getElementById(). To effectively use this, the elements being referenced must have id attributes applied. getElementById(). value);” /> The onclick event handler for the button calls a function named addOption, using the getElementById() method in order to find the text value in the textbox named newOption. length] = new Option(optionText); } This function is a little different from the last one you saw: It accepts a parameter called optionText, called out in the parentheses after the name of the function.

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