jint Discussions Rss Feed

New Post: Include Javascript Files in a script

toolsfactory — Tue, 07 May 2013 07:08:16 GMT

Is there already a command in that allows me to include code stored in separate js files? In good old php times we used for example require('demo') to include the module demo.php. Something like this I would also need here so that we can make our js modular.

New Post: Accessing current script line number from external functions

toolsfactory — Tue, 07 May 2013 07:04:45 GMT

Does anyone have an idea how the following scenario could be implemented:

whenever an external function (registered using SetFunction("Name", new Action<object>...)) I would like to allow the called function to write a log entry including the current line number.
One way to do this would be running the script in debug mode all the time and manually storing the current line from the OnStep event. But that's eating up performance. So ideally there would be something like a context that I can pass to the external function that holds all the current engine states including the SourceCodeDescriptor structure.

Any ideas welcome

New Post: WebSocket on Jint

eranre — Thu, 18 Apr 2013 12:26:07 GMT

Does anyone know how to use the javascript WebSocket library in jint?

I have an existing script that contains the line "var socket = new WebSocket()" but the jint engine doesn't what is web socket.

Does anyone have a solution?

New Post: Reuse of JintEngine? Performance question

Martin_Andersen — Tue, 09 Apr 2013 14:08:05 GMT

Should I hold on to an JintEngine instance?

private static JintEngine _scriptEngine;

    private static JintEngine ScriptEngine
    {
        get { return _scriptEngine ?? (_scriptEngine = new JintEngine()); }
    }

New Post: Calling a function on a c-object

bee4cp — Wed, 27 Mar 2013 14:09:06 GMT

Just an update:

When we create the father object within VB.NET and set its members to the original, it works. We can even modify the members of that instance within JavaScript, they are then changed in the original object. It seems that somehow the father object (OURComDataTypes.COURDocument) cannot be passed correctly to JavaScript, when it is created within the modules of our application written in C (COM).

The first 3 lines of the function correct that. While this is a valid workaround, we are still confused why this could happen. Does anyone have an idea what we can do?

Public Function CallJavaScript(ByVal method As String, ByRef input As OURComDataTypes.COURDocument) As Boolean
    Dim input1 As New OURComDataTypes.COURDocument  // create a new instance 
    input1.ParameterList = input.ParameterList      // share members with the original
    input1.Children = input.Children                // dito
    If JavaScriptContext Is Nothing Then
        ' initialize the javascript engine
        JavaScriptContext = New Jint.JintEngine
        JavaScriptContext.AllowClr = True
        JavaScriptContext.DisableSecurity()
    End If

    Dim ScriptTextContent As String = ReadScript(method)
    If (ScriptTextContent.Length = 0) Then
        Throw New Exception("JavaScript for method " & method & " is empty")
        CallJavaScript = False
        Exit Function
    End If

    If Not input Is Nothing Then
         JavaScriptContext.SetParameter("input", input1)
    End If


    Try
       
        returnString = JavaScriptContext.Run(ScriptTextContent)
    ...
    
End Function

New Post: anchor form controls

brojgar — Tue, 26 Mar 2013 13:42:24 GMT

How can achieve this:

Control.Anchor = ((System.Windows.Forms.AnchorStyles)
                (((System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right)));

in jint javascript?
thanks,
i.

New Post: Calling a function on a c-object

bee4cp — Mon, 25 Mar 2013 15:56:50 GMT

Hi,

we have a C-library which is registered in windows and which we use for our shared informations.
We access this lib from VB.NET. We have instances to objects within that library, which we pass from VB.NET to the jint instance by setParameter()

Depending on the way how we create the object, we get the error "Function expected" when we try to execute a method on that object.

The javascript code looks like this:


// now we access an object from a list of objects within the 
var pp = input.ParameterList.getFieldFromFieldCollection("field1")

// the objects have a member called "value". We need to call get_Value() to access.
return pp.get_Value().toString()

Now, as said, when we create the input object "manually" from within VB.NET, the above javascript works fine.

When we create the input object within other c methods and pass it through VB.NET, we always get "Function expected".

Any clues how to resolve this?

New Post: Jint.JintJsException: Invalid IL code in (wrapper dynamic-method) Jint.Marshal.ProxyHelper:dynamicPropertyGetter (Jint.Marshaller,Jint.Native.JsDictionaryObject): method body is empty

jch254 — Tue, 19 Mar 2013 23:38:38 GMT

Hi, I am getting this error on every script, I am running Jint inside a .Net application which is running on Mono. Has anyone seen this before?

This is part of the stack trace:

System.Delegate CreateDelegate 0 0
System.Delegate CreateDelegate 0 0
System.Reflection.Emit.DynamicMethod CreateDelegate 0 0
Jint.Marshal.ProxyHelper WrapGetProperty 0 0
Jint.Marshaller WrapGetProperty 0 0
Jint.Marshaller MarshalPropertyInfo 0 0
Jint.Native.NativeConstructor .ctor 0 0
Jint.Native.NativeTypeConstructor Wrap 0 0
Jint.Marshaller CreateConstructor 0 0
Jint.Marshaller MarshalType 0 0
Jint.Marshaller MarshalClrValue 0 0
Jint.Native.NativeDescriptor Get 0 0
Jint.Native.JsDictionaryObject TryGetProperty 0 0
.....

Looking inside NativeConstructor.cs there is only two calls to MarshalPropertyInfo:

        // find and add all static properties and fields
        foreach (var info in type.GetProperties(BindingFlags.Static | BindingFlags.Public))
            DefineOwnProperty(Global.Marshaller.MarshalPropertyInfo(info, this));

and

        foreach (var info in type.GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public))
        {
            ParameterInfo[] indexerParams = info.GetIndexParameters();
            if (indexerParams == null || indexerParams.Length == 0)
                m_properties.AddLast(global.Marshaller.MarshalPropertyInfo(info, this));

It seems like a similar issue to this: https://bugzilla.xamarin.com/show_bug.cgi?id=6821#c5

Any help would be amazing

Thanks

New Post: Debugging CallFunction

notahack — Sat, 09 Mar 2013 00:32:36 GMT

don't you have to write the function like thus

var test = function(){
code;
code;
etc etc;;
}

New Post: File exists detection

notahack — Sat, 09 Mar 2013 00:29:03 GMT

I bet javascript doesn't need that @ sign in front of the string

New Post: Dang even a caveman can use it BUT ...

notahack — Sat, 09 Mar 2013 00:16:38 GMT

I am rewriting a vb6 project that I used the WSH in. Basically I defined some classes I plugged into the script for users to use functions from. I kept plugging in other objects and then I would call functions to act like events that would execute user written scripting that would manipulate those objects. I always got what information I needed from those changed objects and never relied on any return code. This code will do exactly that for me and so far I am happy happy happy.

My BUT is this. I will construct the script and run it once to compile it. From then on out I will be constantly, sometimes hundreds of times a minute, using SetParameter to plug in objects and calling the trigger/event functions. Will banging on jint like that be any problem for hours on end?

New Post: How do I go from a Javascript array to a c# object?

alexrootes — Sun, 03 Mar 2013 13:02:27 GMT

Late to the party but for anyone googling it can be done like this:

Jint.JintEngine engine = new Jint.JintEngine();
Jint.Native.JsArray result = engine.Run(script);

for (var i = 0; i < result.Length; i++)
{
    var jsObj = result.get(i) as Jint.Native.JsObject;

    if (jsObj == null) continue;

    foreach (var kvp in jsObj)
    {
        Console.WriteLine("{0} is {1}", kvp.Key, kvp.Value);
    }
}

New Post: Data Binding with C# Object

Bofferd — Tue, 19 Feb 2013 19:54:39 GMT

Is there any high-level mechanism to enable Data Binding or PropertyChangeNotify between a C# object outside of the interpreter with an object stored within the JINT engine? I'm looking to store data in the engine and connect to the GUI to allow users to easily change the data but I also need to reflect back-end changes to the data on the GUI.

New Post: Using C# overload in JavaScript

lbouriez — Wed, 23 Jan 2013 10:12:31 GMT

Hi, I am new using Jint :)

For some reasons, we need to use overload function from C# in JavaScript.
I have an object (from an api) named ORSOleObject where I can in C# do a GetValeur like that:

ORSOleObject toto = MyObject;

string result = toto.GetValeur("string");

I do a SetParameter and give toto to the JavaScript with Jint but when I try to do a GetValeur in JavaScript I got an error, the SetParameter is working, I can use the toto but not the overload function.

Can you help me, I found the SetFunction but I am not sure How to use it.

Thanks.

New Post: Current Development Status

sebastienros — Wed, 16 Jan 2013 20:10:23 GMT

I personally have not worked on it for a long time, and don't intend to for some time. I am not the only developer though ...

New Post: Current Development Status

rodneyjt — Wed, 16 Jan 2013 20:07:14 GMT

What is the current development status of Jint?

Has the development ended?

Thanks

New Post: HTTP Request? Out of the box?

SlashMind — Mon, 07 Jan 2013 03:52:46 GMT

New Post: more than one year past, whats about ECMAScript5? Any newer version?

softboy99 — Sun, 30 Dec 2012 10:40:19 GMT

more than one year past, whats about ECMAScript5? Any newer version?

New Post: returning Jint.Native.JsInstance objects from c#

sgrondahl — Thu, 20 Dec 2012 22:20:53 GMT

var jintarr = global.ArrayClass.New(); solved the problem.

New Post: Unit Test "ShouldNotReferenceThisAsGlobalScopeInDetachedFunctionInStrictMode" failed

jianhuahuang — Wed, 19 Dec 2012 16:15:27 GMT

I downloaded the latest source (May 2012), plus the latest Antlr3 (version 3.4.1.9004), built the whole solution with Viisual Studio 2010 and .NET 4.0 Client Profile.

When I ran the Unit Tests (Jint.Tests), all of Unit Tests passed except for ShouldNotReferenceThisAsGlobalScopeInDetachedFunctionInStrictMode. It failed on the statement [ assert(1, getx()); ] because getx() returns null (it should return 1).

It appears that his Unit Test has been added after the last release. What would be the cause to this failure? It seems the global 'this' was not found.

FYI: Migrating JINT to VS2010 and .NET 4 invloves resolving ambiguous Func<> delegates (by changing to either System.Func<> or Jint.Delegates.Func<>).

thanks

john