[BUGFIX] The RTE isn't loading sometimes

Classes/Loader.php

@@ -123,6 +123,32 @@ class Loader {
 		$configuration = $this->tinymceConfiguration['preJS'];
 		$configuration .= '
 			var SG = SG || {};
+			SG.domIsReady = (function(domIsReady) {
+			   var isBrowserIeOrNot = function() {
+				  return (!document.attachEvent || typeof document.attachEvent === "undefined" ? "not-ie" : "ie");
+			   }
+
+			   domIsReady = function(callback) {
+				  if(callback && typeof callback === "function"){
+					 if(isBrowserIeOrNot() !== "ie") {
+						document.addEventListener("DOMContentLoaded", function() {
+						   return callback();
+						});
+					 } else {
+						document.attachEvent("onreadystatechange", function() {
+						   if(document.readyState === "complete") {
+							  return callback();
+						   }
+						});
+					 }
+				  } else {
+					 console.error("The callback is not a function!");
+				  }
+			   }
+
+			   return domIsReady;
+			})(SG.domIsReady || {});
+
 			SG.initTinyMceLoadFunction = function() {
 				if (SG.initializedTinyMceLoaderInstance) {
 					return;
@@ -132,11 +158,12 @@ class Loader {
 					SG.initializedTinyMceLoaderInstance = new SG.TinyMceLoader(window.tinymce, {
 						' . $this->replaceTypo3Paths($this->tinymceConfiguration['configurationData']) . '
 					});
-					clearInterval(SG.initTinyMceLoadInterval);
 				}
 			};
-			SG.initTinyMceLoadFunction();
-			SG.initTinyMceLoadInterval = window.setInterval(SG.initTinyMceLoadFunction, 333);
+
+			SG.domIsReady(function() {
+				SG.initTinyMceLoadFunction();
+			});
 		';
 		$configuration .= $this->tinymceConfiguration['postJS'];