Clojurians Log v2

what I ended up doing was using WebSockets via Sente (https://github.com/ptaoussanis/sente) to create an event bus, this is a little bit involved but ultimately has a nice property: you can transparently dispatch events between the webview and javafx bi-directionally using the same re-frame esque conventions (if you also plan on using ClojureScript in the Webview)

I would suggest having a look at this: https://openjfx.io/javadoc/14/javafx.web/javafx/scene/web/WebEngine.html

this doc describes how one can setup communication with the web page

you can access the web engine by creating custom props, for example

here are some examples of built-in custom props that access WebEngine: https://github.com/cljfx/cljfx/blob/master/src/cljfx/ext/web_view.clj

thank you a lot, I was hoping for something builtin to cljfx, but it seems doable. So if I understand well, I will have to create my own lifecycle, which will setup the communication in its create method (by using WebEngine)?

you will create extension lifecycle that wraps web-view lifecycle:

(def ext-with-my-stuff 
  (fx/make-ext-with-props 
    {:my-custom-prop-that-establishes-communication ...}))

{:fx/type ext-with-my-stuff
 :props {:my-custom-prop-that-establishes-communication ...}
 :desc {:fx/type :web-view
        ...}}

nice 🙂 I will start like this. thank you a lot for the help

I've got a java question (I'm not so much familiar with clj/java interop). I'm trying to make this snippet work in the context of my cljfx app: (its from the https://openjfx.io/javadoc/14/javafx.web/javafx/scene/web/WebEngine.html you've linked)

EventListener listener = new EventListener() {
        public void handleEvent(Event ev) {
            Platform.exit();
        }
    };

    Document doc = webEngine.getDocument();
    Element el = doc.getElementById("exit-app");
    ((EventTarget) el).addEventListener("click", listener, false);

first statement — you mean this?

EventListener listener = new EventListener() {
        public void handleEvent(Event ev) {
            Platform.exit();
        }
    }

yes

it’s like that in clojure:

(reify EventListener
  (handleEvent [this ev]
    (Platform/exit)))

so it creates an instance of EventListener interface

@joelkuiper seems appealing to be able to use clojurescript in a webview, i've tryed without success. do you have some code to show ?

@vlaaad, ho! I'm surprised that it is so simple! thank you (looking at the javadoc I taught that I would need a proxy)

@vlaaad, when I try to evaluate your expression I get this error

Syntax error (IllegalArgumentException) compiling reify* at (codemirror.clj:75:1).
Can't define method not in interfaces: handleEvent

yep, it’s org.w3c.dom.events.EventListener

ok 🙂 thank you a lot

I found it like that: WebEngine’s document property is defined here: https://openjfx.io/javadoc/14/javafx.web/javafx/scene/web/WebEngine.html#documentProperty() it returns a value of type “Document”, and it’s has a link leading here: https://docs.oracle.com/en/java/javase/12/docs/api/java.xml/org/w3c/dom/Document.html?is-external=true So this is something from the JDK, and at that site I searched for addEventListener and found this: https://docs.oracle.com/en/java/javase/12/docs/api/java.xml/org/w3c/dom/events/EventTarget.html#addEventListener(java.lang.String,org.w3c.dom.events.EventListener,boolean)