asp.net qr code ASP.NET AJAX CLIENT LIBRARIES in C#

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CHAPTER 4 ASP.NET AJAX CLIENT LIBRARIES
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Figure 4-4. Displaying a currency value in US $
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Once again, just as with the Date extension, if you plan to use any culture-specific functionality, be sure to set the EnableScriptGlobalization property of the ScriptManager control to true.
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Object Extension
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The Object extension in the ASP.NET AJAX client library provides some level of reflection functionality to JavaScript types. This is a far cry from the rich feature set of reflection in the .NET Framework, but it is a potentially useful functionality in JavaScript. The Object extension contains methods to describe the type and the type name of an object. This extension contains only two static-like methods, getType and getTypeName, as shown in Table 4-7.
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Table 4-7. Methods of the Object Extension Method Name
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getType getTypeName
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Description
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Returns the type of a specified object Returns the type name of an object
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Type discovery can be particularly useful when you need to control the logic flow based on the type of a parameter or other variables. Consider the following script block:
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<script language=javascript type="text/javascript"> var num = new Number(4); var date = new Date('05/31/2007'); function DisplayTypeInfo(obj) { document.writeln("Value: " + obj + " | Type: "+ Object.getType(obj)+ " | Type Name: " + Object.getTypeName(obj)); document.writeln("<BR>");
CHAPTER 4 ASP.NET AJAX CLIENT LIBRARIES
} DisplayTypeInfo(num); DisplayTypeInfo(date); </script>
In this script, two variables of type Number and Date are instantiated and assigned initial values. After that, the DisplayTypeInfo function is called to display the type information for these two variables. The getType method is called here for the type of the variable followed by the getTypeName to get the name of the variable type. As you can see in Figure 4-5, the type contains more information than the type name.
Figure 4-5. Displaying type and type names of two variables
String Extension
Last but not least, the JavaScript s native String object has been extended in the xyz to include a handful of useful additions to once again make it somewhat more similar to the String class in the .NET Framework. These additions can be very useful because string processing in one form or another is done quite often in most applications. Other than two formatting methods (similar to those found in the Date and Number extensions), the String extension includes a few trimming methods among others as shown in Table 4-8.
Table 4-8. Methods of the String Extension Method Name
endsWith format
Description
Returns a boolean value indicating whether or not the end of the String object matches the specified string Formats a string by replacing placeholders with provided values
CHAPTER 4 ASP.NET AJAX CLIENT LIBRARIES
Method Name
localeFormat startsWith trim trimEnd trimStart
Description
Formats a string by replacing placeholders with provided values with locale specificity Returns a boolean value indicating whether or not the start of the String object matches the specified string Removes leading and trailing spaces from a String object Removes trailing spaces from a String object Removes leading white spaces from a String object
The following small script illustrates usage of some of the main methods of the String extension:
<script language=javascript type="text/javascript"> var asp = " ASP"; var dotnet =".NET "; var ajax = " Ajax "; alert (String.format("{0}{1} {2} String Extension!", asp.trimStart(),dotnet.trimEnd(),ajax.trim())); </script>
In this script, all three available trimming methods were used to trim the extra space from the start, end, and overall part of the designated string. These string variables were then passed into the format method as arguments to be displayed (as shown in Figure 4-6) just like it would be with the .NET Framework s String class. One last point to note here is that the two formatting methods of the String extension are static methods, unlike the rest of the methods, which are instance based.
Figure 4-6. Using methods of the String extension
CHAPTER 4 ASP.NET AJAX CLIENT LIBRARIES
Note The ASP.NET AJAX client library also includes a StringBuilder class in the Sys namespace that
is quite similar in terms of functionality to the StringBuilder class in the .NET Framework and is a great candidate to be used for extensive string manipulation on the client.
The Sys Namespace
The Sys namespace is the root namespace for xyz and basically is the running engine behind ASP.NET AJAX. The members of this namespace are classes responsible for the core AJAX functionality you have seen so far in the book. These classes do all the under the hood heavy lifting, handling issues such as data serialization, application life cycle, and asynchronous operation, to just name a few. Extensive coverage of all the classes and features of this namespace is well beyond the scope of this chapter, but you will learn about some of the key pieces of this important namespace. Table 4-9 lists the main namespaces of the ASP.NET AJAX Client Library.
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