UnityObject callback function never runs

Questions & Answers
1

I’m trying to make my browser send a message to the unity game, I already got this to work when the user clicks a button on the web page, but my goal is for the function to execute as soon as the unity game has finished loading in the browser. I tried using the “callback” parameter of the embedUnity function, but it never executes. I have been following the example found here:

http://unity3d.com/support/documentation/Manual/Working%20with%20UnityObject.html

my web page (abridged) javascript looks similar to this:

if (typeof unityObject != "undefined") {
			unityObject.embedUnity("unityPlayer", "Example.unity3d", 600, 450, null, null, onUnityLoaded);
		}
		function onUnityLoaded(result) {
			if (result.success) {
				setVariables();
    alert("Successfully reached callback and set variables.");
			}
			else {
				alert("Unity failed to load game.");
			}
		}

function setVariables() {
    getUnityObject().SendMessage("Main Camera","setVariable","myArgument");
}

In my web page there is a button which calls the setVariables function when it is clicked, and that works. I also tried using UnityObject’s “AddLoadEvent” and “AddDomLoadEvent”, neither of those worked. I tried calling my “setVariables” function from the body “onLoad” event handler, but that does not work because the page finishes loading before the unity game is loaded. So the function “setVariables” was executed before the unity game was ready. So my question is:

Why is the callback function not working? How can I make it work?

2

Javascript or JScript is an immediate dynamic language, it isn't compiled. So when the browser reaches the embed line, onUnityLoaded is undefined because you create that function after that line. I guess that's your problem ;)

Just move the function in front of your embed line or use the just-in-place-method like in the example ;)

3

I think the workaround for this problem is to have the unity application notify the web page when it is done loading. The callback function always runs before the unity player has finished loading.