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Returns the SQL necessary to cast a value to a format that can be used with the specified The return value must also include a placeholder for the actual value to be cast, and by default it simply returns Returns the maximum number of characters the database engine allows to be used for table and column names This returns by default, which indicates there s no limit Returns the value that should be used to indicate a limit of infinity, used when specifying an offset without a limit Some databases allow an offset to be used without a limit, and in these cases, this method should return By default, this raises a , and must be implemented by a backend in order to allow offsets to be used without limits.

suffer from this limitation. In fact, Mozilla-powered browsers such as FireFox implement the HTTP request capabilities natively, without using an ActiveX control. It s worth noting that when the callback is performed, the target page actually starts executing a trimmed-down life cycle. Most control events won t execute, but the Page.Load and Page.Init event handlers will. The Page.IsPostBack property will return true, but you can distinguish this callback from a genuine postback by testing the Page.IsCallback property, which will also be true. The page rendering process is bypassed completely. View state information is retrieved and made available to your callback method, but any changes you make are not sent back to the page. Figure 29-12 shows the life-cycle events.

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Figure 29-12. Comparing postbacks and callbacks The only problem with the current implementation of client callbacks is that the programming interface is still fairly primitive, especially in its requirement that you exchange only strings. The current trend in ASP .NET is to use the callback features to build dynamic features into dynamic controls, rather than consuming them directly in the page. You ll see an example of this technique in the next section. ASP .NET developers have also begun work on another toolkit, called Atlas, which aims to provide a library that capitalizes on the client callback features and uses them to expose higher-level features. This is widely expected to be a significant part of the ongoing evolution of web applications.

For a look at another attempt to create responsive web pages with callbacks, check out the free Ajax.NET library at http://ajax.schwarz-interactive.de/csharpsample. Ajax.NET uses attributes to flag methods, which then become remotely callable through a client callback. Ultimately, the higher-lever features it provides (or features like it) will probably be supported natively in future versions of ASP.NET.

Returns the value to be used when issuing an statement to indicate that the primary key field should use its default value that is, increment a sequence rather than some specified ID; defaults to Returns a modified form of , suitable for use with a comparison in the query s clause By default, this escapes any percent signs ( ), underscores ( ) or double backslashes ( ) found in with extra backslashes as appropriate indicated by return a custom is return If the backend provides a custom class, as , this method must class based on the supplied If , this method is never called, so the default behavior is to simply.

JavaScript plays an important role in many advanced web controls. In an ideal world, the web-page developer never needs to worry about JavaScript. Instead, web-page developers program with neat

object-oriented controls, which render the JavaScript they need to optimize their appearance and their performance. This gives you the best of both worlds object-oriented programming on the server and the client-side capabilities of JavaScript. You can create any number of controls with JavaScript and the HTML document model. Common examples include rich menus, trees, and lists, many of which are available (some for free) at Microsoft s http://www.asp.net community site. In the following sections, you ll consider two custom controls that use JavaScript a pop-up window generator and a rollover button.

For most people, pop-up windows are one of the Web s most annoying characteristics Usually, they deliver advertisements, but sometimes they serve the more valid purpose of providing helpful information or inviting the user to participate in a survey or promotional offer A related variant is the pop-under window, which displays the new window underneath the current window This way, the advertisement doesn t distract the user until the original browser window is closed It s fairly easy to show a pop-up window by using the windowopen() function in a JavaScript block Here s an example: <script language="javascript"> windowopen('http://wwwapresscom', 'myWindow', 'toolbar=0, height=500, width=800, resizable=1, scrollbars=1') windowfocus(); </script> The windowopen() function accepts several parameters.

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