diff --git a/private/racket-webview-qt.rkt b/private/racket-webview-qt.rkt
index 053b7a7..8db1e5a 100644
--- a/private/racket-webview-qt.rkt
+++ b/private/racket-webview-qt.rkt
@@ -21,6 +21,7 @@
          rkt-webview-set-url!
          rkt-webview-set-html!
          rkt-webview-run-js
+         rkt-webview-call-js
          rkt-webview-move
          rkt-webview-resize
          rkt-webview-exit
@@ -200,6 +201,9 @@
 (define (rkt-webview-run-js wv js)
   (rkt_webview_run_js (rkt-wv-win wv) js))
 
+(define (rkt-webview-call-js wv js)
+  (rkt_webview_call_js (rkt-wv-win wv) js))
+
 (define (rkt-webview-resize wv w h)
   (rkt_webview_resize (rkt-wv-win wv) w h))
 
diff --git a/private/racket-webview.rkt b/private/racket-webview.rkt
index e7d301e..a11ec6d 100644
--- a/private/racket-webview.rkt
+++ b/private/racket-webview.rkt
@@ -18,10 +18,12 @@
          webview-devtools
          webview-close
          webview-run-js
+         webview-call-js
          webview-move
          webview-resize
          webview-bind!
          webview-standard-file-getter
+         
          )
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -113,7 +115,7 @@
                         #:parent [p 0])
   (let* ((h (make-wv #f current-servlet-port -1 file-getter bj #f))
          (server (let ((s (start-web-server h)))
-                   (sleep 1)
+                   (sleep 1) ;;; TODO: Check if web server is up. 
                    s))
          (event-processor (λ (wv evt)
                             (event-callback h (util-parse-event evt))))
@@ -166,9 +168,9 @@
             (on-not-exist file base-path p)
             p)))))
 
-;(define (webview-call-js wv js)
-;  (let ((result (rkt_webview_call_js (wv-handle wv) js)))
-;    result))
+(define (webview-call-js wv js)
+  (let ((result (rkt_webview_call_js (wv-handle wv) js)))
+    result))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; testing
diff --git a/private/web-racket.rkt b/private/web-racket.rkt
index 64484a8..17a29d9 100644
--- a/private/web-racket.rkt
+++ b/private/web-racket.rkt
@@ -79,6 +79,18 @@
          (set! _std_x 50))
        )))
 
+  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+  ;; Storage
+  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+  
+  (define windows (make-hash))
+  
+  (define (ww-debug msg)
+    (displayln (format "DBG: ~a" msg)))
+
+  (define (ww-error msg)
+    (displayln (format "ERR: ~a" msg)))
+  
   ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   ;; Class representing an element in the HTML page
   ;;   each element is identified by an id. 
@@ -94,9 +106,9 @@
       (define/public (get-id)
         id)
 
-      (define/public (win)
-        (let ((w (hash-ref windows (ww-win-id win-id) #f)))
-          w))
+      ;(define/public (win)
+      ;  (let ((w (hash-ref windows (ww-win-id win-id) #f)))
+      ;    w))
 
       (define connected-callbacks (make-hash))
 
@@ -110,7 +122,7 @@
               (apply cb args)))))
 
       (define/public (exec-js js)
-        (ww-exec-js win-id js))
+        (webview-run-js win-id js))
 
       (define/public (connect evt func)
         (hash-set! connected-callbacks evt func))
@@ -119,34 +131,34 @@
         (hash-remove! connected-callbacks evt))
 
       (define/public (add-style! st)
-        (ww-add-style win-id id st))
+        (webview-add-style win-id id st))
 
       (define/public (set-style! st)
-        (ww-set-style win-id id st))
+        (webview-set-style win-id id st))
 
       (define/public (style)
-        (ww-get-style win-id id))
+        (webview-get-style win-id id))
 
       (define/public (get-attr a)
-        (ww-get-attr win-id id a))
+        (webview-get-attr win-id id a))
 
       (define/public (set-attr! a val)
-        (ww-set-attr win-id id a val))
+        (webview-set-attr win-id id a val))
 
       (define/public (del-attr a)
-        (ww-del-attr win-id id a))
+        (webview-del-attr win-id id a))
 
       (define/public (get-attrs)
-        (ww-get-attrs win-id id))
+        (webview-get-attrs win-id id))
 
       (define/public (add-class! cl)
-        (ww-add-class win-id id cl))
+        (webview-add-class win-id id cl))
 
       (define/public (remove-class! cl)
-        (ww-remove-class win-id id cl))
+        (webview-remove-class win-id id cl))
 
       (define/public (has-class? cl)
-        (ww-has-class? win-id id cl))
+        (webview-has-class? win-id id cl))
 
       (define/public (enable)
         (send this remove-class! 'disabled))
@@ -175,7 +187,7 @@
 
       (define/public (set-inner-html! html-or-sexpr)
         (if (string? html-or-sexpr)
-            (ww-set-inner-html win-id id html-or-sexpr)
+            (webview-set-inner-html! win-id id html-or-sexpr)
             (set-inner-html! (xexpr->html5 html-or-sexpr))))
 
       (super-new)
@@ -345,6 +357,8 @@
                   [height (if (eq? settings #f) _std_h (send settings get 'window-height _std_h))]
                   [icon #f]
                   [menu #f]
+                  [base-path (build-path ".")]
+                  [on-not-exist (λ (file base-path path) path)]
                   [html-file #f]
                   )
 
@@ -525,10 +539,10 @@
         (ww-get-elements win-id selector))
 
       (define/public (move x y)
-        (ww-move win-id x y))
+        (webview-move win-id x y))
 
       (define/public (resize x y)
-        (ww-resize win-id x y))
+        (webview-resize win-id x y))
 
       (define/public (get-x) x)
       (define/public (get-y) y)
@@ -731,14 +745,17 @@
         ;          (ww-new profile use-browser)
         ;          (ww-new profile use-browser parent-id)))
         (set! win-id (webview-create
-                      (λ (file) file)
+                      (webview-standard-file-getter base-path
+                                                    #:not-exist not-exist)
+                      event-handler))
+                        
         (when (eq? win-id #f)
           (error "Window could not be constructed"))
 
-        (hash-set! windows-evt-handlers (ww-win-id win-id) event-handler)
+        ;(hash-set! windows-evt-handlers (ww-win-id win-id) event-handler)
         (hash-set! windows (ww-win-id win-id) this)
 
-        (ww-resize win-id width height)
+        (webview-resize win-id width height)
 
         (when parent
             (let* ((parent-width (send parent get-width))
@@ -750,7 +767,7 @@
               (set! y (+ parent-y (/ (- parent-height height) 2)))
               )
           )
-        (ww-move win-id x y)
+        (webview-move win-id x y)
         
         (send this set-title! title)
         
diff --git a/rktwebview_qt/main.cpp b/rktwebview_qt/main.cpp
index fdf00f8..4702f46 100644
--- a/rktwebview_qt/main.cpp
+++ b/rktwebview_qt/main.cpp
@@ -32,6 +32,22 @@ int main(int argc, char *argv[])
             rkt_webview_open_devtools(wv1);
         }
 
+        if (i == 3) {
+            rkt_js_result_t *r = rkt_webview_call_js(wv1, "{ let a = 7 * 6; console.log('a = ' + a); return a; }");
+            printf("rkt_js_result: %d: %s\n", r->result, r->value);
+        }
+
+        if (i == 4) {
+            rkt_js_result_t *r = rkt_webview_call_js(wv1, "let el = document.getElementById('hi');el.value = '10';");
+            printf("rkt_js_result: %d: %s\n", r->result, r->value);
+        }
+
+        if (i == 6) {
+            rkt_js_result_t *r = rkt_webview_call_js(wv1, "document.body.innerHTML = '<h1>Hi!</h1>'; return document.body.innerHTML;");
+            printf("rkt_js_result: %d: %s\n", r->result, r->value);
+        }
+
+
         if (i == 10) {
             wv2 = rkt_webview_create(0, eventCb);
         }
diff --git a/rktwebview_qt/rktutils.h b/rktwebview_qt/rktutils.h
index ef3ac0f..acedce0 100644
--- a/rktwebview_qt/rktutils.h
+++ b/rktwebview_qt/rktutils.h
@@ -15,4 +15,21 @@ public:
 
 QString mkEventJson(const EventContainer &kv);
 
+class Command
+{
+public:
+    int cmd;
+    QVector<QVariant> args;
+    QVariant result;
+    bool done;
+    bool js_result_ok;
+public:
+    Command(int _cmd) {
+        cmd = _cmd;
+        done = false;
+        js_result_ok = true;
+    }
+};
+
+
 #endif
diff --git a/rktwebview_qt/rktwebview.cpp b/rktwebview_qt/rktwebview.cpp
index c887b4e..ac8ea8b 100644
--- a/rktwebview_qt/rktwebview.cpp
+++ b/rktwebview_qt/rktwebview.cpp
@@ -66,6 +66,14 @@ result_t rkt_webview_run_js(rktwebview_t wv, const char *js)
     return r;
 }
 
+rkt_js_result_t *rkt_webview_call_js(rktwebview_t wv, const char *js)
+{
+    rkt_webview_init();
+    rkt_js_result_t *r = handler->rktCallJs(wv, js);
+    return r;
+}
+
+
 
 result_t rkt_webview_open_devtools(rktwebview_t wv)
 {
@@ -95,6 +103,14 @@ result_t rkt_webview_destroy_event(rkt_event_t *e)
     return result_t::oke;
 }
 
+result_t rkt_webview_destroy_js_result(rkt_js_result_t *r)
+{
+    free(r->value);
+    free(r);
+    return result_t::oke;
+}
+
+
 result_t rkt_webview_move(rktwebview_t wv, int x, int y)
 {
     rkt_webview_init();
@@ -118,3 +134,5 @@ bool rkt_webview_valid(rktwebview_t wv)
     rkt_webview_init();
     return handler->rktValid(wv);
 }
+
+
diff --git a/rktwebview_qt/rktwebview.h b/rktwebview_qt/rktwebview.h
index 47c1626..7faa013 100644
--- a/rktwebview_qt/rktwebview.h
+++ b/rktwebview_qt/rktwebview.h
@@ -32,6 +32,13 @@ typedef enum {
     resize_failed = 13
 } result_t;
 
+typedef struct {
+    result_t result;
+    char    *value;
+} rkt_js_result_t;
+
+
+
 RKTWEBVIEW_QT_EXPORT void rkt_webview_init();
 RKTWEBVIEW_QT_EXPORT void rkt_webview_process_events(int for_ms);
 
@@ -44,6 +51,9 @@ RKTWEBVIEW_QT_EXPORT result_t rkt_webview_set_url(rktwebview_t wv, const char *u
 RKTWEBVIEW_QT_EXPORT result_t rkt_webview_set_html(rktwebview_t wv, const char *html);
 
 RKTWEBVIEW_QT_EXPORT result_t rkt_webview_run_js(rktwebview_t wv, const char *js);
+RKTWEBVIEW_QT_EXPORT rkt_js_result_t *rkt_webview_call_js(rktwebview_t wv, const char *js);
+RKTWEBVIEW_QT_EXPORT result_t rkt_webview_destroy_js_result(rkt_js_result_t *r);
+
 RKTWEBVIEW_QT_EXPORT result_t rkt_webview_open_devtools(rktwebview_t wv);
 
 RKTWEBVIEW_QT_EXPORT result_t rkt_webview_destroy_event(rkt_event_t *e);
diff --git a/rktwebview_qt/rktwebview_qt.cpp b/rktwebview_qt/rktwebview_qt.cpp
index 4c44b59..b453338 100644
--- a/rktwebview_qt/rktwebview_qt.cpp
+++ b/rktwebview_qt/rktwebview_qt.cpp
@@ -18,20 +18,7 @@
 #define COMMAND_DEV_TOOLS   7
 #define COMMAND_MOVE        8
 #define COMMAND_RESIZE      9
-
-class Command
-{
-public:
-    int cmd;
-    QVector<QVariant> args;
-    QVariant result;
-    bool done;
-public:
-    Command(int _cmd) {
-        cmd = _cmd;
-        done = false;
-    }
-};
+#define COMMAND_CALL_JS      10
 
 void Rktwebview_qt::processCommands()
 {
@@ -127,6 +114,19 @@ void Rktwebview_qt::processCommands()
             cmd->done = true;
         }
         break;
+        case COMMAND_CALL_JS: {
+            int wv = cmd->args[0].toInt();
+            QString js = cmd->args[1].toString();
+            if (_views.contains(wv)) {
+                WebviewWindow *w = _views[wv];
+                w->callJs(js, cmd);
+            } else {
+                cmd->result = false;
+                cmd->js_result_ok = false;
+                cmd->done = true;
+            }
+        }
+        break;
         case COMMAND_DEV_TOOLS: {
             int wv = cmd->args[0].toInt();
             if (_views.contains(wv)) {
@@ -260,6 +260,22 @@ result_t Rktwebview_qt::rktSetHtml(rktwebview_t wv, const char *html)
     return r ? result_t::oke : result_t::set_navigate_failed;
 }
 
+rkt_js_result_t *Rktwebview_qt::rktCallJs(rktwebview_t wv, const char *js)
+{
+    Command c(COMMAND_CALL_JS);
+    QString _js(js);
+    c.args.push_back(wv);
+    c.args.push_back(_js);
+    _command_queue.enqueue(&c);
+    while(!c.done) { doEvents(); }
+
+    rkt_js_result_t *r = static_cast<rkt_js_result_t *>(malloc(sizeof(rkt_js_result_t)));
+    r->result = c.js_result_ok ? result_t::oke : result_t::eval_js_failed;
+    r->value = strdup(c.result.toString().toUtf8());
+
+    return r;
+}
+
 result_t Rktwebview_qt::rktRunJs(rktwebview_t wv, const char *js)
 {
     Command c(COMMAND_RUN_JS);
diff --git a/rktwebview_qt/rktwebview_qt.h b/rktwebview_qt/rktwebview_qt.h
index 0cf6ccf..5aece18 100644
--- a/rktwebview_qt/rktwebview_qt.h
+++ b/rktwebview_qt/rktwebview_qt.h
@@ -57,6 +57,7 @@ public:
     result_t rktSetUrl(rktwebview_t wv, const char *url);
     result_t rktSetHtml(rktwebview_t wv, const char *html);
     result_t rktRunJs(rktwebview_t wv, const char *js);
+    rkt_js_result_t *rktCallJs(rktwebview_t wv, const char *js);
     result_t rktMove(rktwebview_t wv, int x, int y);
     result_t rktResize(rktwebview_t wv, int w, int h);
     bool rktValid(rktwebview_t wv);
diff --git a/rktwebview_qt/webviewwindow.cpp b/rktwebview_qt/webviewwindow.cpp
index 9e5f118..e5356b3 100644
--- a/rktwebview_qt/webviewwindow.cpp
+++ b/rktwebview_qt/webviewwindow.cpp
@@ -129,6 +129,31 @@ void WebviewWindow::runJs(const QString &js)
     p->runJavaScript(js);
 }
 
+void WebviewWindow::callJs(const QString &js, Command *c)
+{
+    QWebEnginePage *p = _view->page();
+    QString _js = QString("{\n") +
+                          "  let f = function() {\n" +
+                          "    " + js + "\n" +
+                          "  };\n" +
+                          "  try {\n" +
+                          "     let obj = { oke: true, result: f(), exn: false };\n" +
+                          "     obj;\n" +
+                          "  } catch(e) {\n" +
+                          "     let obj = { oke: false, result: false, exn: e.message };\n" +
+                          "     obj;\n" +
+                          "  }\n" +
+                          "}";
+    p->runJavaScript(_js, [c](const QVariant &v) {
+                                c->result = v;
+                                QJsonObject obj = v.toJsonObject();
+                                bool ok = obj["oke"].toBool();
+                                c->js_result_ok = ok;
+                                c->result = QString::fromUtf8(QJsonDocument(obj).toJson(QJsonDocument::JsonFormat::Compact));
+                                c->done = true;
+    });
+}
+
 void WebviewWindow::openDevTools()
 {
     _devtools = new QMainWindow(this);
diff --git a/rktwebview_qt/webviewwindow.h b/rktwebview_qt/webviewwindow.h
index 4e48520..cf266d8 100644
--- a/rktwebview_qt/webviewwindow.h
+++ b/rktwebview_qt/webviewwindow.h
@@ -6,6 +6,7 @@
 
 class WebViewQt;
 class Rktwebview_qt;
+class Command;
 
 class WebviewWindow : public QMainWindow
 {
@@ -39,6 +40,7 @@ public:
 
 public:
     void runJs(const QString &js);
+    void callJs(const QString &js, Command *c);
     void openDevTools();
 
 public: