mjvesa

Python and Vaadin 14

In this article we will see how Vaadin UIs can be written using Python. We'll use Jython which implies Python 2.7. GraalVM will be considered in a later article.

Wiggling Python into Vaadin

First download a server side starter from vaadin.com or any other place. We won't be using client side templates, but build UIs purely using code. Next

mjvesa

;; Example of a custom Vaadin widget in Scheme using Spil (github.com/mjvesa/spil)
;;
;; define-widget is a macro which takes the code and distributes it between the client and server
;; client part is uploaded to the browser
;; call-server invokes a server-rpc from the client side
;; server-rpc defines a server-rpc
(define-widget (button text listener)
  `((client
      (let ((button (element-new '(button ,text))))
       (append-to-root button)

mjvesa

;; Example of a custom Vaadin widget in Scheme using Spil (github.com/mjvesa/spil)
;;
;; The widget macro is wrapped in another macro to set the button text and callback listener
;; client part is uploaded to the browser
;; call-server invokes a server-rpc from the client side
;; server-rpc defines a server-rpc
(define-macro (button text listener)
  `(widget
    (client
      (let ((button (element-new '(button ,text))))