(blog ‘lucindo)

Javascript (Ajax) e HTML em Lisp

Para testar algumas coisas refiz hoje o código do post Common Lisp e Ajax. Desta vez estou usando o patch para o HT-AJAX com suporte e jQuery. Além disso, para gerar código JavaScript uso Parenscript. Assim todo HTML e JS é produzido por s-exps:

(eval-when (:compile-toplevel :load-toplevel :execute)
  (defparameter *dependencies*
    ‘(:asdf :hunchentoot :ht-ajax :cl-who :parenscript))
  (map nil ‘require *dependencies*))

(defpackage :ajax-test
  (:use :common-lisp :hunchentoot :ht-ajax :cl-who :parenscript))

(in-package :ajax-test)

(defparameter *local-dir* “/Users/lucindo/Documents/Lisp/web/3rdparty/”)
(defparameter *ajax-handler-url* “/ajax”)
(defparameter *ajax-processor*
  (make-ajax-processor :type :jquery
                       :server-uri *ajax-handler-url*
                       :js-file-uris “/static/jquery.js”))

(defun testfunc (command)
  (prin1-to-string (handler-case (eval (read-from-string command nil))
                                 (error (c) (format nil “~a” c)))))

(defun js ()
  (ps
   (defun command_clicked ()
     (let ((command (document.get-element-by-id “command”)))
       (with-slots (value) command
                   (ajax_testfunc_set_element “result” value))))))

(defun main-page ()
  (with-html-output-to-string
   (*standard-output* nil :prologue t)
   (:html
    (:head
     (:script :type “text/javascript” :src “/js”)
     (:title “AJAX test”)
     (fmt “~a” (generate-prologue *ajax-processor*)))
    (:body
     (:h1 “ajax test”)
     (:table :width “50%”
             (:tr
              (:td :colspan “2″
                   (:span :id “result”
                          (:i “no results yet”))))
             (:tr
              (:td :width “70%”
                   (:input :type “text”
                           :size “70″
                           :name “command”
                           :id “command”))
              (:td (:input :type “button”
                           :value “eval”
                           :onclick (ps-inline (command_clicked))))))))))

(eval-when (:load-toplevel :execute)
  (export-func *ajax-processor* ‘testfunc :method :post)
  (setf *dispatch-table*
        (list ‘dispatch-easy-handlers
              (create-folder-dispatcher-and-handler “/static/”
                                                    *local-dir* “text/plain”)
              (create-prefix-dispatcher *ajax-handler-url*
                                        (get-handler *ajax-processor*))
              (create-prefix-dispatcher “/js” ‘js)
              (create-prefix-dispatcher “/” ‘main-page))))

(defparameter *webserver* nil)

(defun start-web (&optional (port 4242))
  (setf *webserver* (start-server :port port)))

(defun stop-web ()
  (stop-server *webserver*))

Download: ajax2.lisp