WebSharper 4.2.9 released

This is a minor release for WebSharper and WebSharper.UI.

Install templates for .NET Core SDK: dotnet new -i WebSharper.Templates::4.2.9.232

Download templates for Visual Studio 2017: http://websharper.com/installers/WebSharper.4.2.9.232.vsix

WebSharper Core

Enhancement

• #921 Now JSON deserialization can handle the System.Object type, implemented as follows:
  • deserializing on the client side just returns the parsed value (ie. one of: null, a boolean, a string, a number, an array or a plain object).
  • deserializing on the server side produces a boxed value:
    • null, boolean, string return a value of the corresponding type.
    • number: returns a float (System.Double)
    • array: returns a recursively parsed obj[]
    • object: returns a recursively parsed Dictionary<string, obj>
  • serializing from System.Object is not supported. This is to avoid accidentally upcasting the argument of Json.Serialize to System.Object when a type annotation is missing.

Fixes

• #935 Seq.chunkBySize and other similar functions does not fail erroneously on some inputs.
• #934 If for a website project, there is no "outputdir" in ws.config or WebSharperOutputDir in project properties or a web.config file in the project folder, an explicit error is given that the unpack output directory cannot be determined.

WebSharper UI

Enhancement

• Add Router.InstallInto and Router.InstallHashInto, which are similar to Router.Install and Router.InstallHash respectively except that they take a Var<'EndPoint> as argument rather than creating and returning one.

Fixes

• #164 Remove click event handler on Doc.Checkbox, only keeping change, to avoid setting the Var twice.
• #166 Add proxy for quotation-based .OnXyz(...) event handlers.
• #167 Fix initial value of Var.Make whenever an initial value is available from the View.
• #168 Add View.TryGet : View<'T> -> option<'T> which returns the current value of a View if available, or None if not (eg if a View.MapAsync hasn't returned yet).

Happy coding!