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The AJAX features in ASP.NET help you create client script and integrate it into ASP.NET applications. This includes a type system for ECMAScript (JavaScript) and extensions to existing ECMAScript (JavaScript) objects to give them the richness of .NET Framework classes. ASP.NET also includes the ScriptManager control to manage these script libraries and any custom script in your application.
This topic contains the following sections:
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Developer Community for Visual Studio Product family. Visual Studio. Visual Studio for Mac.NET. Reported by Fons May 22 at 10:03 AM windows 10.0 visual studio 2017 version 15.7. I have created a VisualState in Blend. It is recording so all changes in properties will be added to the VisualState.Setters. Properties can represent any primitive or reference type. You access property values with get and set accessor methods. In the Microsoft Ajax Library, the get and set accessors are functions, which by convention use the prefix 'get_' or 'set_' in the function name. In this article, we will show grid rows of Qualified Leads in Green Color, Lost or Disqualified Leads in Red color and Newly created Leads in Yellow Color Step 1: Create a web resource of JavaScript Type and paste the below code under Text Editor.
- Scenarios
- Using the Type System
- Using Extensions to the JavaScript Base Types
- Integrating Client Script into ASP.NET Web Applications
Scenarios
You can use features of the Microsoft Ajax Library that are in Visual Studio and Visual Web Developer Express when you want to do the following:
- Add object-oriented capabilities to your JavaScript code to increase code reuse, flexibility, and maintainability.
- Use reflection to examine the structure and components of client script at run time.
- Use enumerations to provide an easily readable alternative to integer representations.
- Use extensions to the JavaScript base types to cut down development time for common scripting tasks.
- Use debugging extensions and a trace feature for faster and more informative debugging than with traditional JavaScript debugging techniques.
Using the Type System
The Microsoft Ajax Library adds a type system and extensions to JavaScript objects to provide frequently used object-oriented features that resemble features in the .NET Framework. They enable you to write AJAX-enabled ASP.NET applications in a structured way that improves maintainability, makes it easier to add features, and makes it easier to layer functionality. Microsoft Ajax Library extensions add the following capabilities to JavaScript:
- Classes
- Namespaces
- Inheritance
- Interfaces
- Enumerations
- Reflection
The library also provides helper functions for strings and arrays.
Classes, Members, and Namespaces
The Microsoft Ajax Library includes base classes, and objects and components that derive from them. Together, these classes enable you to use an object-oriented programming model for writing client script.
The Type class adds object-oriented features such as namespaces, classes, and inheritance to JavaScript programming. Any JavaScript object that is registered by using the Type class automatically has access to this functionality. The following example shows how to use the Type class to create and register a namespace and a class in a JavaScript file:
Classes can have four kinds of members: fields, properties, methods, and events. Fields and properties are name/value pairs that describe characteristics of an instance of a class. Fields are composed of primitive types and are accessed directly, as in the following example:
Properties can represent any primitive or reference type. You access property values with get and set accessor methods. In the Microsoft Ajax Library, the get and set accessors are functions, which by convention use the prefix 'get_' or 'set_' in the function name. For example, to get or set a value for a property such as cancel, you call the get_cancel or set_cancel methods.
The Microsoft Ajax Library raises events in response to actions that occur during the life-cycle of an AJAX client application. The Microsoft Ajax Library also provides a standard way for you to create custom events for AJAX client components. For more information see Creating Custom Client Events and Ajax Client Life-Cycle Events.
The Microsoft Ajax Library provides a way to register namespaces so that you can group common functionality. The following example demonstrates how to add a Person class to the Demo namespace using the Type.registerNamespace and .registerClass methods.
To enable AJAX functionality for an ASP.NET Web page, you must add a ScriptManager control to the page. When the page is rendered, the appropriate script references to AJAX client-script libraries are generated automatically. The following example shows a page with a ScriptManager control.
The following example shows how to register the namespace, create the class, and then register the class.
Access Modifiers
Most object-oriented programming languages include the concept of access modifiers, which allow you to specify under what contexts a class or member is available, such as to outside programs, internal classes within the same namespace, or only within a specific code block. There are no access modifiers in JavaScript. However, the Microsoft Ajax Library follows the convention that members with names that start with the underscore character ('_') are considered private and not accessed outside the class that they are a part of.
Inheritance
Inheritance is the ability of one class to derive from another class. A derived class automatically inherits all the fields, properties, methods and events of the base class. A derived class can add new members or override existing members of the base class to change their behavior.
The following example contains two classes defined in script: Person and Employee, where Employee derives from Person. Both classes illustrate the use of private fields, and both have public properties and methods. In addition, Employee overrides the toString implementation of the Person class, and uses the base class functionality.
Interfaces
An interface defines the input and output requirements of classes that implement it. This enables a function to interact with classes that implement the same interface regardless of what other functionality the class implements.
The following example defines a Tree base class and an IFruitTree interface. Apple and Banana, two derived classes, implement the IFruitTree interface, but the Pine class does not. Any class that implements the IFruitTree interface makes sure that a bearFruit method is a member of that class.
Enumerations
An enumeration is a class that contains a set of named integer constants. You access the values like properties, as in the following example:
Enumerations provide an easily readable alternative to integer representations. For more information about enumerations in the Microsoft Ajax Library, see Type.registerEnum Method (Microsoft Ajax).
The following example defines an enumeration of named colors that represent hexadecimal values.
Reflection
Reflection is the ability to examine the structure and components of a program at run time. The APIs that implement reflection are extensions of the Type class. These methods enable you to collect information about an object, such as what it inherits from, whether it implements a particular interface, and whether it is an instance of a particular class.
The following example uses reflection APIs to test the GreenApple class from the previous interface example.
Using Extensions to the JavaScript Base Types
Extensions to JavaScript base types provide additional functionality for those types. For more information about these extensions, see the following topics:
The Sys.Debug class provides extensive debugging capabilities. For more information, see Debugging and Tracing Ajax Applications Overview and the Sys.Debug class overview.
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If you create components that are based on the Microsoft Ajax Library, you can create can create debug and release versions of script files that are automatically managed by the ScriptManager control. You can identify debug versions of script files by including '.debug' as part of the script file name. For example, the following script file names identify retail and debug versions of a file:
- MyScript.js (retail)
- MyScript.debug.js (debug)
Integrating Client Script into ASP.NET Web Applications
Any ASP.NET Web page can access a script file by referring to it in a script block, as in the following example:
However, a script invoked in this manner cannot participate in partial-page rendering or access certain components of the Microsoft Ajax Library. To make a script file available for partial-page rendering in an AJAX-enabled ASP.NET Web application, the script must be registered with the ScriptManager control on the page. To register a script file, create a ScriptReference object that points to the file question and that adds it to the Scripts collection. The following example shows how to do this in markup:
For script files to be processed correctly by the ScriptManager control, each file must include a call to the Sys.Application.notifyScriptLoaded method at the end of the file. This call notifies the application that the file has finished loading. The following example shows the code to use for this purpose:
You can also embed .js files as resources in managed-code assemblies. (You might do this if create an ASP.NET server control with AJAX functionality that is implemented in client script.) If your script is embedded in an assembly, you do not have to include a notification statement in the script. You also do not have to specify a path attribute in the script reference. However, you must provide the name of the assembly without the file name extension, as shown in the following example:
Note
This scenario is not common for page developers, because most controls with embedded script libraries reference their scripts internally. For more information, see Walkthrough: Embedding a JavaScript File as a Resource in an Assembly.
You can also register scripts programmatically by creating script references in code and then adding them to the Scripts collection. For more information, see Dynamically Assigning Script References.
You can register scripts that are required for partial-page updates by using the registration methods of the ScriptManager control. You can use these methods in the following ways:
- To generate client script in code, build a block of script as a string and pass it to the RegisterClientScriptBlock method.
- To add stand-alone script files that have no Microsoft Ajax Library dependencies, use the RegisterClientScriptInclude method.
- To add script files that are embedded in an assembly, use the RegisterClientScriptInclude method.NoteScripts that are registered by using these methods do not have localization support.
For a complete list of script-registration methods and their uses, see the ScriptManager control overview.
Any script blocks or inline script that you are registering must be inside the page's form element. Otherwise, the script is not registered with the ScriptManager control and cannot access ASP.NET AJAX functionality. For more information, see Sys.Application.initialize Method.
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Release History
- February 6, 2019 – Visual Studio 2017 for Mac version 7.8 Preview 3
- January 23, 2019 – Visual Studio 2017 for Mac version 7.8 Preview 2
- December 18, 2018 – Visual Studio 2017 for Mac version 7.8 Preview 1
Release Highlights
This release focuses on improving the quality in Visual Studio for Mac through bug fixes, performance improvements, and reliability improvements.
Visual Studio 2017 for Mac version 7.8 Preview 3 (7.7.0.1607)
released February 6, 2019
Shell
- We fixed an issue where custom key bindings for Remove Unused and Sort (Usings) don't work.
.NET Core
- We fixed an issue where the create button doesn't create new project for .NET Core 3.0 preview 2.
- We fixed an issue where .NET Core 3.0 can be selected in the New Project dialog when it is not supported.
Web Tools
- We fixed an issue where Publish to Azure creates a profile with the wrong name.
Xamarin
- We fixed an issue when attempting to drag and drop controls to iOS storyboards from the Tool Box after searching for controls does not work.
Xamarin.Android
- We fixed an issue where the JDK notification was shown on the welcome page, even for non-Android projects.
- We fixed an issue where launching Visual Studio for Mac without any Java installed shows 2 system prompts to install Java.
Visual Studio 2017 for Mac version 7.8 Preview 2 (7.7.0.1547)
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released January 23, 2019
Code Editor
- We fixed an issue where Using statement indenting is incorrect.
- We fixed an issue where Roslyn throws a fatal exception (System.ArgumentOutOfRangeException).
- We fixed an issue where formatting of parameters across multiple lines is incorrect.
- We fixed an issue where the constructor generator would cause Visual Studio for Mac to crash.
- We fixed an issue where smart semicolon placement causes incorrect semicolon placement.
Shell
- We fixed an issue where switching from the application and returning, does not focus on the editor correctly.
- We fixed an issue where the cursor in editor window is lost when switching applications.
- We fixed an issue where focusing out/into Visual Studio changes the default focused element on the UI.
- We fixed an issue where Visual Studio for Mac would fail to track file changes for files in certain folders.
- We fixed an issue where Visual Studio for Mac doesn't remember opened files.
- We fixed an issue where the Toolbar selector for build configuration is disabled.
NuGet
- We fixed an issue where Visual Studio for Mac crashes after 'Could not add packages' error.
.NET Core
- We removed the VB.NET option from .NET Core projects.
ASP.NET Core
- We fixed an issue where the Folder profile would be created with 'Default' configuration instead of 'Release'.
Web Tools
- We fixed an issue where application arguments are not passed to the Azure Functions host.
- We added the following additional Azure Functions templates
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Xamarin
Xamarin.Android
- We fixed an issue where the Android resource update could occur at the same time as a build which could then cause build issues.
- We fixed an issue where Visual Studio for Mac would fail to upload APK to Acer Chromebook R11.
Debugger
- We fixed an issue where the debugger would fail when running on an external console on Mojave.
Test Tools
- We fixed an issue where xUnit Fact 'DisplayName' not shown in test explorer if the name has a period at the end.
- We fixed an issue where the text editor unit test integration ('Unit test 'name' could not be loaded') would fail.
F#
- We fixed an issue where open statements for F# must be manually added when pasting/writing code.
Visual Studio 2017 for Mac version 7.8 Preview 1 (7.7.0.1471)
released December 18, 2018
Visual Studio
Code Editor
- We fixed an issue where typing can be slow in large files when accessibility is enabled.
- We fixed an issue where a fatal error can occur when trying to navigate inside the editor using VoiceOver.
- We fixed an issue where the caret location in quick fix margin is incorrect.
- We fixed a performance issue where indent correcting is taking up too much time on large files.
- We fixed an issue where Intellisense soft-selection is confusing.
- We fixed an issue where Visual Studio for Mac can't open .targets files.
- We fixed an issue where the display updates partially when commenting a collapsed method.
- We fixed an issue where C# syntax highlight doesn't work for some of the keywords.
- We fixed an issue where invoking some snippets from the toolbox in .cs files leads to poorly formatted code.
- We fixed an issue where pressing Down to choose the closing tag completion in XAML IntelliSense closes the completion window.
- We fixed an issue where the file 'redacted' could not be opened.
- We fixed an issue where sometimes pasting fails in XAML files.
- We fixed an issue where, when adding an attribute via Intellisense, it does not trim 'Attribute' from the name.
- We fixed an issue where code suggestion does the wrong thing when
(
is pressed after a stray arrow key.
Project System
- We fixed an issue where the copy & paste of a XAML file causes a disassociation between the .xaml and .xaml.cs files.
- We fixed an issue where files are being added to ItemGroup.Compile(Remove) and this related issue - Error type of namespace not found.
- We fixed an issue where an invalid C# file is created with a new library project.
- We fixed an issue where it is not possible to create a culture specific .resx file through the 'New File ..' menu in the Solutions Explorer context menu.
Shell
- We fixed an issue where adding a new folder to a project does not allow instant renaming.
- We fixed an issue where Start Debugging after Start without Debugging results in an exception for ASP.Net projects.
- We fixed a performance issue with build output search.
- The Run Item command on the Solution Explorer has been renamed to Run Project.
- We fixed an issue where the welcome page is shown when loading a solution from finder.
NuGet
- We updated the version of NuGet to 4.8.
- NuGet package diagnostic warnings are now shown in the Solution Explorer. Any diagnostics warnings will be rendered with a warning icon and the full text of the warning available as a tool tip.
- We fixed a set of issues with NuGet:
- problem while restoring NuGet packages which don't have stable version.
- The VS4Mac bundle nuget version is too old: 4.3.1.
- Referencing packages conditionally using variable does not work correctly.
- Xamarin.Forms app with multi target framework library referenced fail to build.
- Visual Studio Mac Csproj build not support Item contidion.
- Support conditional NuGet PackageReferences in multi-targeting projects.
- Show per-framework dependencies when multi-targeting.
- VS cannot build F# dotnet core solution.
- Nuget restore ignore build targets.
- NuGet restores the wrong version of Microsoft.AspNetCore.App.
Assembly Browser
- We fixed an issue where the Assembly Browser shows the wrong icon for properties.
- We fixed an issue where
System.DayOfWeek
enum (Wednesday
) does not appear to be assigned a value.
Web Tools
- We fixed an issue where it was not possible to publish to Azure API App instances.
Xamarin
- We updated the Xamarin Test Cloud agent NuGet version.
- We fixed an issue where the View Archives command would appear in .NET Core projects.
Designers
- We fixed an issue where the toolbox regressed Android designer usage.
Xamarin.iOS
- It is now possible to choose .pdf files for image assets that do not support vector images.
- We fixed an issue where Visual Studio for Mac erroneously indicates that a Xamarin.Mac property is unavailable.
- We fixed an issue where it is not possible to choose devices for named colors in the asset catalog.
- We fixed an issue where the iOS simulator is no longer brought to front when starting a debug session.
- We fixed an issue where Native References not working in iOS library projects and appear to be ignored.
- We fixed an issue where deleting a Native Reference does not delete the the file on disk.
- We fixed an issue where the Debugger doesn't connect to a keyboard extension on any device.
Xamarin.Android
- We fixed an issue where new Android apps have uppercase letters in the package name.
- We fixed an issue where 'Your project is not referencing the 'Mono.Android.Version=v8.1' framework' when AndroidUseLatestPlatformSDK is true.
- We fixed an issue where Visual Studio for Mac does not recognize
AndroidManifest
in specific build configurations.. - We fixed an issue where opening the Report A Problem dialog also displays 'Install JDK' dialog.
- We fixed an issue where the Google Play SDK warning is shown even when publishing Ad-Hoc.
Xamarin.Forms
- Intellisense in Xamarin.Forms XAML files for FontFamily is now available.
Xamarin.Mac
- We fixed an issue where .xib templates seem to need
customObjectInstantitationMethod='direct'
added. - We fixed an issue where it is not possible to change the target framework version for Xamarin.Mac full on re-opening project options.
- We fixed an issue where the project options for a Mac build (classic) shows incorrect UI.
Test Tools
- We fixed a performance issue where the 'Test Results' pane has bad performance when very large amounts of text are shown.
- We fixed an issue where the unit test integration in the editor does not properly trigger test cases.
- We fixed an issue that could cause xunit to fail to restore.
Accessibility
- We fixed a number of accessibility issues in this release, including several VoiceOver issues in the Debugger and in creating iOS developer certificates, and Keyboard issues in the Android SDK Manager.
Other
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- We fixed an issue where new F# projects shows IntelliSense errors.
- We fixed an issue where unchecking the Organize Using > Place System directives first setting does not save.
- We fixed an issue where Visual Studio for Mac is not remembering settings.
- We fixed an issue for F# projects where Visual Studio for Mac overwrites the project GUID to be lowercase instead of uppercase.
- We fixed an issue for F# projects where Visual Studio for Mac overwrites the project GUID to be lowercase instead of uppercase.
Visual Studio 2017 for Mac Preview Release Notes History
You can view prior Preview versions of Visual Studio 2017 for Mac release notes: