Update build

Author: linev

build/jsroot.js

@@ -351,7 +351,7 @@ function getDocument() {
 
 /** @summary Inject javascript code
   * @desc Replacement for eval
-  * @returns {Promise}
+  * @returns {Promise} when code is injected
   * @private */
 function injectCode(code) {
    if (nodejs) {
@@ -364,19 +364,26 @@ function injectCode(code) {
          fs.writeFileSync(name, code);
          return import("file://" + name);
       }).finally(() => fs.unlinkSync(name));
-   } if (typeof document !== 'undefined') {
+   }
+   if (typeof document !== 'undefined') {
 
       // check if code already loaded - to avoid duplication
       let scripts = document.getElementsByTagName('script');
       for (let n = 0; n < scripts.length; ++n)
          if (scripts[n].innerHTML == code)
             return Promise.resolve(true);
 
-      let element = document.createElement("script");
-      element.setAttribute("type", "text/javascript");
-      element.innerHTML = code;
-      document.head.appendChild(element);
-      return Promise.resolve(true);
+      let promise = code.indexOf("JSROOT.require") >= 0 ? _ensureJSROOT() : Promise.resolve(true);
+
+      return promise.then(() => {
+         return new Promise(resolve => {
+            let element = document.createElement("script");
+            element.setAttribute("type", "text/javascript");
+            element.innerHTML = code;
+            document.head.appendChild(element);
+            setTimeout(() => resolve(true), 10); // while onload event not fired, just postpone resolve
+         });
+      });
    }
 
    return Promise.resolve(false);