Announcement

**Jerry.Richards** · 06-20-2018, 01:41 PM

Based on this: https://answers.unrealengine.com/que...avascript.html
and this: https://answers.unrealengine.com/sto...ing+to+c++.txt

I ended up performing the following:

FirstPersonGameMode.cpp

Code:

#ifdef EMSCRIPTEN
#include <emscripten.h>
#endif



#ifdef EMSCRIPTEN
extern "C" {

 AFirstPersonGameMode* EMSCRIPTEN_KEEPALIVE EmscriptenGetGameMode()
 {
  if (GEngine)
  {
   TArray<APlayerController*> Players;
   GEngine->GetAllLocalPlayerControllers(Players);

   if (Players.Num() > 0)
   {
    const UWorld* World = Players[0]->GetWorld();
    if (World)
    {
     return Cast<AFirstPersonGameMode>(World->GetAuthGameMode());
    }
   }
  }

  return NULL;
 }


 void EMSCRIPTEN_KEEPALIVE JSStartGame()
 {
  AFirstPersonGameMode* gameMode = EmscriptenGetGameMode();
  if (gameMode)
  {
   gameMode->JSStartPlay();
  }
 }
}
#endif

Then in my JavaScript function:

Code:

    <script>
        function startGame() {
            Module.ccall('JSStartGame', [], []);
        }

        function setScore(score) {
            document.getElementById("score").value = score;
        }
    </script>
<body>
    <div>
        <button id="" type="button" onclick="startGame()">Start Game</button>
        <p>Score: <input type="text" id="score" /></p>
    </div>
</body>

When the score changes I call the JavaScript function from the UE4 FirstPersonPlayerState.cpp:

Code:

#ifdef EMSCRIPTEN
#include <emscripten.h>
#endif


void AFirstPersonPlayerState::AddScore(float score)
{
 //GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Red, "AddScore called");
 Score += score;

#ifdef EMSCRIPTEN
 EM_ASM_ARGS({ setScore($0); }, Score);
#endif
}

Announcement

Get GameMode, Call Methods from JavaScript

Get GameMode, Call Methods from JavaScript

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