MSIE JavaScript Engine for .NET

This project is a .NET wrapper for working with the JavaScript engines of Internet Explorer and Edge (JsRT versions of Chakra, ActiveScript version of Chakra and Classic JavaScript Engine). Project was based on the code of SassAndCoffee.JavaScript and Chakra Sample Hosts.

MSIE JavaScript Engine requires a installation of Internet Explorer or Edge on the machine and can work in 5 modes, that are defined in the JsEngineMode enumeration:

• Auto. Automatically selects the most modern JavaScript engine from available on the machine.
• Classic. Classic MSIE JavaScript engine (supports ECMAScript 3 with possibility of using the ECMAScript 5 Polyfill and the JSON2 library). Requires Internet Explorer 6 or higher on the machine.
• ChakraActiveScript. ActiveScript version of Chakra JavaScript engine (supports ECMAScript 5). Requires Internet Explorer 9 or higher on the machine.
• ChakraIeJsRt. “IE” JsRT version of Chakra JavaScript engine (supports ECMAScript 5). Requires Internet Explorer 11 or Microsoft Edge on the machine.
• ChakraEdgeJsRt. “Edge” JsRT version of Chakra JavaScript engine (supports ECMAScript 5). Requires Microsoft Edge on the machine.

The supported .NET types are as follows:

• MsieJavaScriptEngine.Undefined
• System.Boolean
• System.Int32
• System.Double
• System.String

Installation

This library can be installed through NuGet - http://nuget.org/packages/MsieJavaScriptEngine.

Usage

Consider a simple example of usage of the MSIE JavaScript Engine:

namespace MsieJavaScriptEngine.Example.Console
{
    using System;

    using MsieJavaScriptEngine;
    using MsieJavaScriptEngine.Helpers;

    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                using (var jsEngine = new MsieJsEngine())
                {
                    const string expression = "7 * 8 - 20";
                    var result = jsEngine.Evaluate<int>(expression);

                    Console.WriteLine("{0} = {1}", expression, result);
                }
            }
            catch (JsEngineLoadException e)
            {
                Console.WriteLine("During loading of JavaScript engine an error occurred.");
                Console.WriteLine();
                Console.WriteLine(JsErrorHelpers.Format(e));
            }
            catch (JsRuntimeException e)
            {
                Console.WriteLine("During execution of JavaScript code an error occurred.");
                Console.WriteLine();
                Console.WriteLine(JsErrorHelpers.Format(e));
            }

            Console.ReadLine();
        }
    }
}

First we create an instance of the MsieJsEngine class. Then we evaluate a JavaScript expression by using of the Evaluate method and output its result to the console. In addition, we provide handling of the following exception types: JsEngineLoadException and JsRuntimeException.

Also, when you create an instance of the MsieJsEngine class, then you can pass the JavaScript engine settings via the constructor. Consider in detail properties of the JsEngineSettings class:

Property name	Data type	Default value	Description
EngineMode	JsEngineMode enumeration	Auto	JavaScript engine mode.
UseEcmaScript5Polyfill	Boolean	false	Flag for whether to use the ECMAScript 5 Polyfill.
UseJson2Library	Boolean	false	Flag for whether to use the JSON2 library

Release History

See the changelog.

License

Microsoft Public License (Ms-PL)

Credits

• SassAndCoffee.JavaScript - License: Microsoft Public License (Ms-PL) Part of the code of this library served as the basis for the ActiveScript version of Chakra and Classic JavaScript Engine.
• Chakra Sample Hosts - License: Apache License 2.0 (Apache) C# example from this project served as the basis for the JsRT versions of Chakra.
• ECMAScript 5 Polyfill and MDN JavaScript Polyfills - Adds support for many of the new functions in ECMAScript 5 to downlevel browsers.
• Cross-Browser Split - Adds ECMAScript compliant and uniform cross-browser split method.
• JSON2 library - Adds support of the JSON object from ECMAScript 5 to downlevel browsers.
• Microsoft Ajax Minifier - License: Apache License 2.0 (Apache) JS-files, that used MSIE JS Engine, minificated by using AjaxMinifier.exe.

Who's Using MSIE JavaScript Engine

If you use the MSIE JavaScript Engine in some project, please send me a message so I can include it in this list:

• Chevron by Simon Cropp
• JavaScript Engine Switcher by Andrey Taritsyn
• SquishIt by Justin Etheredge and Alex Cuse
• Strike by Simon Cropp