         print("ERROR: Bible page load error \(withError)")
         NotificationCenter.default.post(name: ReaderPagesController.WEB_LOAD_DONE, object: nil)
     }
+    
+    //
+    // WKScriptMessageHandler
+    //
+    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
+        if let noteId = message.body as? String {
+            if message.name == "book" {
+                print("click on book")
+            }
+            else if message.name == "note" {
+                print("click on note")
+            }
+        }
+    }
 }

import UIKit
import WebKit

class ReaderViewController : AppViewController, WKNavigationDelegate {
    
    private var webView: WKWebView!
    private var _reference: Reference!

        configuration.preferences.javaScriptEnabled = true
        let js = Note.decodeRange + Note.installEffect + Note.encodeRange
        let script = WKUserScript(source: js, injectionTime: .atDocumentStart, forMainFrameOnly: false)
        let contentController = WKUserContentController()
        contentController.addUserScript(script)
        contentController.add(self, name: "book")
        contentController.add(self, name: "note")
        configuration.userContentController = contentController
        self.webView = WKWebView(frame: self.view.bounds, configuration: configuration)
        self.webView.backgroundColor = AppFont.backgroundColor
        
