When using the debug version of the script, however, you get the benefit of running the debug version of the script, and a better error message is displayed, explaining that the argument cannot be undefined. You saw when using the path attribute of a ScriptReference to load a script from a file that the ScriptManager does not switch automatically between debug and release versions of the script.
And when using the name and assembly attributes to specify loading of an embedded script, it will pick up the right version based on the server setting. If you do not provide a debug version of the script, the ScriptManager will notice this and fall back to the release version. It is not an error to skip inclusion of debug script resources. You can include all three attributes - name, assembly, and path - in a single ScriptReference ele-ment and get a slightly different behavior still.
The path will be used to retrieve the script from disk, but the determination of whether or not a debug version of the script is available is made by looking at the embedded resources. If you have a debug embedded resource and choose to get the script from disk, it is an error to try and retrieve the debug version if it does not exist on disk. The ScriptManager will not fall-back from the filesystem to the embedded resource.
NET Framework has good support for providing and using localized resources in. NET applications. This is a feature that has been lacking in JavaScript. NET AJAX makes it possible to provide localized string resources and have the correct language used automatically at runtime. It follows the same principle as the previous example of embedded script resources, but extends it to automatically generate a string resource class.
Instead, the ScriptResource attribute is used along with the WebResource attribute to instruct the ScriptManager to create the class. The WebResource attribute is still required to specify the resource name and its type. Then the ScriptResource attribute is added with the name of the script resource, along with the name of the string resources to use and the name of the class to create in JavaScript for use in the browser.
This is done in the AssemblyInfo. The name of the. You can define shortText and longText keys in the LocalizedMessage. In this case, fr means the French language, and FR means the French culture.
In some cases, a given language can have several culture variations, for example, American English versus British English. Figure shows the French resource file. As you can see, it really is just a set of name-value pairs being established for cultures that will be accessed in the application. To use localized resources, you do not have to provide versions for every possible culture known to the.
NET Framework. A request for a culture that does not have localized versions of the strings will fall back to the default strings instead. To enable localization on the ScriptManager, you must set the EnableLocalization property to true. It is false by default. Another default setting of ASP. NET needs to be changed to make effective use of the localization feature.
The ScriptManager will provide the localized resources in the culture setting under which the page is running. The browser will send with each web request an ordered list of language preferences.
NET will take the top entry from the list of languages and use that culture to execute the request. Note that it does not try subsequent entries in the list if the first one is not a valid culture on the server. Listing LocalizedResource. Now, if the language preference in the browser is English, the page will display Attention messages in English.
The options dialog of your browser allows you to add, remove, and reorder your language preference. Figure shows adding French to the list of preferred languages. Remember that ASP. NET will only try the topmost item from the preferred languages list. When French is the most preferred language, the UICulture for the thread processing the server request is switched to French, and the ScriptManager selects the French resource strings.
Script localization allows you to provide for specific translations of text for use in JavaScript in the browser. Script globalization is the ability to format and parse data using a specific culture. For example, it is customary in U. The ScriptManager will populate a CultureInfo object, with the data from the culture being used to process the page on the server when EnableGlobalization is set to true.
For script localization, you change the Page UICulture property to Auto , but for globalization you use the Culture property. UICulture is for language choice, while Culture is for date and number parsing and formatting.
In Listing Globalization. This version of the formatting API will respect the current culture setting in the browser. With globalization, you can get language-specific formatting in the browser without needing to provide localized resource files in your application. Much of the emphasis of richer application development centers on leveraging web services through asynchronous communications with the server.
NET Ajax makes this easy. You can declare references to web services within the ScriptManager in much the same way that the previous examples do for scripts. Suppose you want to mark the time that some event occurred on the client. You might provide a web service like the one in Listing Servertime.
NET that it should provide a JavaScript proxy class for use in calling the web service. If you navigate directly to the. NET provides a page that allows you to invoke the methods directly from the browser without writing any code.
In a similar vein, if you navigate to the. NET will return the proxy code necessary to invoke the method directly from script. The ScriptManager will generate a dynamic script element for the proxy code associated with each ScriptReference it contains.
You can optionally set the InlineScript property to true to have the proxy code rendered directly in the page. Listing ServiceReference. The pageLoad function first sets the timeout to milliseconds from the default value, where there is no client timeout. The code then invokes the web service providing the names of callback functions to invoke for success or failure.
Web browsers limit the number of simultaneous connections they make back to the server, typically to two. So, if you have a lot of ScriptReference elements in a page, you may want to consider having some select ones rendered inline to avoid contention for multiple concurrent requests to download the proxies. However, the tradeoff is that inline scripts are not cached by the browser and bloat the size of the page. Large, frequently used scripts should be external references to take advantage of browser caching.
The third argument passed to the proxy for invoking the web service is called the userContext. It is not sent to the server but is passed to the completion callback function. This allows you to carry extra data to your callback that is not involved in the web service call without consuming resources to roundtrip it to the server.
Even code that runs correctly almost all of the time can encounter something unexpected. Listing from ThrowError. If an error is encountered and an exception thrown, or if the timeout is exceeded, the error callback is called instead of the success completion function. The object passed to the error handler will provide a JavaScript call stack when an exception is thrown. It also carries any exception message, what the HTTP status code was, and whether or not the error was caused by a timeout.
The result of throwing this exception is shown in Figure Toggle navigation. The content you requested has been removed. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums. Sign in to vote. User posted I am using Asp. Net VB. I am not using a master page.
It manages script resources the JavaScript files used at the client , takes care of partial-page updates as shown earlier, and handles interaction with your web site for things like web services and the ASP.
NET application services such as membership, roles, and profile. Whenever one of the controls within the UpdatePanel causes a postback to the server, only the content within that UpdatePanel is refreshed.
If you analyze the data that gets sent from the server to the browser using a network analysis tool like Fiddler or Wireshark , you would see that only a limited amount of data gets sent to the client. You usually place the ScriptManager control directly in a content page if you think you need Ajax capabilities on only a handful of pages. You can only have one ScriptManager per page i. In order to access a ScriptManager control that is defined in a master page from a content page, you can use the ScriptManagerProxy.
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