make mathjax host a config option, revamp script loading, fragment examples #531

plugin/math/math.js

@@ -9,27 +9,10 @@ var RevealMath = window.RevealMath || (function(){
 	var loaded = false;
 
 	var config = Reveal.getConfig().math || {};
+	config.host = config.host || 'http://cdn.mathjax.org/mathjax/latest/MathJax.js';
 	config.mode = config.mode || 'TeX-AMS_HTML-full';
 
-	var head = document.querySelector( 'head' );
-	var script = document.createElement( 'script' );
-	script.type = 'text/javascript';
-	script.src = 'http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=' + config.mode;
-
-	// Detect when the script has loaded
-	script.onload = onScriptLoad;
-
-	// IE
-	script.onreadystatechange = function() {
-		if ( this.readyState === 'loaded' ) {
-			onScriptLoad.call();
-		}
-	}
-
-	// Normal browsers
-	head.appendChild( script );
-
-	function onScriptLoad() {
+	loadScript( config.host + '?config=' + config.mode, function() {
 
 		// Conditioned just in case both onload and readystate fire
 		if( loaded === false ) {
@@ -48,11 +31,42 @@ var RevealMath = window.RevealMath || (function(){
 				// This will only typeset equations that have not yet been
 				// processed, as well as equations that have change since
 				// last being processed.
-				MathJax.Hub.Update( event.currentSlide );
+				MathJax.Hub.Update( event.currentSlide, function() {
+					Reveal.layout();
+				} );
 
 			} );
 		}
 
+	} );
+
+	function loadScript( url, callback ) {
+
+		var head = document.querySelector( 'head' );
+		var script = document.createElement( 'script' );
+		script.type = 'text/javascript';
+		script.src = url;
+
+		// Wrapper for callback to make sure it only fires once
+		var finish = function() {
+			if( typeof callback === 'function' ) {
+				callback.call();
+				callback = null;
+			}
+		}
+
+		script.onload = finish;
+
+		// IE
+		script.onreadystatechange = function() {
+			if ( this.readyState === 'loaded' ) {
+				finish.call();
+			}
+		}
+
+		// Normal browsers
+		head.appendChild( script );
+
 	}
 
 })();