How do you call JavaScript functions from Tiny C# Systems?

I am familiar with how to call Javascript using Typescript Tiny, but the new C# version appears to use a different method. Any help would be much appreciated.

 

Ugh, realized there is a sample with browser interop. You have to include a ~js folder and a ~prejs folder that Unity can not see, reviewing BrowserInterop solved every question I had.

 

Leaving a mini tutorial as people sent me discussion questions.

This if for Unity Tiny 0.15.3 and may not work in future ones.

First, in the project folder of your UnityTiny project, place the folder "js~" The tilde makes it invisible to Unity Editor.

Inside that make your sample file, I will call mine "MultiplyNumbers.js"

Code (JavaScript):

1. mergeInto(LibraryManager.library, {
2.  
3. MultiplyNumbers: function (p1, p2){
4.     return p1*p2;
5. }
6.  
7. });

Then, you can create a C# system.

Code (CSharp):

1. using Unity.Entities;
2. using UnityEngine;
3. using System.Runtime.InteropServices;
4.  
5. public class JavaCallTest : ComponentSystem
6. {
7.     [DllImport("__Internal")]
8.     private static extern int MultiplyNumbers(int x, int y);
9.  
10.     protected override void OnStartRunning()
11.     {
12.         Debug.Log(MultiplyNumbers(4, 8)); // returns 32
13.     }
14.  
15.     protected override void OnUpdate()
16.     {
17.     }
18. }
19.  

Run this and your debug console should spit out 32.

 

Trying to use the sample these times (tiny 0.26.0; unity 2019.4.0f1), the sample results in

Code (CSharp):

1. error: undefined symbol: MultiplyNumbers
2. warning: Link with `-s LLD_REPORT_UNDEFINED` to get more information on undefined symbols
3. warning: To disable errors for undefined symbols use `-s ERROR_ON_UNDEFINED_SYMBOLS=0`
4. Error: Aborting compilation due to previous errors
5.  

Are there any specific build settings you set with your sample last year, or is this probably due to updated packages.

 

The "js~" folder also needs to be in the root of the asm.def file:
Please check here:
https://github.com/MartinKral/Spherestroyer/tree/master/Assets/Scripts/Main/Utils/URLOpener
or here:
https://github.com/MartinKral/Spherestroyer/tree/master/Assets/Scripts/Main/Utils/Y8API (with callback to c#)

 

That did it, just copied to js~to the scripts folder, which contains the pre-generated asmdef.
@Maras will now check your code further to understand the js-to c# callback . Many thanks.

 

Hi! I have the same issue here. Is it possible to have some screenshots from your hierarchy? Thank you