Tricky ClojureScript syntax

Question

Can anyone please help me understanding, what is going on in this piece of code:

(defn- make-edit-mode-container [widget]
  (let [input-container (template/node [:input.editable-edit-mode {:type "text"}])
        ghandler (goog.events.KeyHandler. input-container)]
      (set! (. input-container -gEditableHandler) ghandler)
  ;; ...
  ;; ...
  input-container))

As I understand, here a private function is declared, it accepts a widget parameter. The local-scope variable input-container is a node (actually it is a dommy.template node) which is a HTML <input type="text" class="editable-edit-mode"> element.

What I can't undestand is (goog.events.KeyHandler. input-container) (e.g. what is dot doing at the end of goog.events.Keyhandler).

Consequently, AFAIU (. input-container -gEditableHandler) is a member access, but then where -gEditableHandler comes from and what does the dash mean?

Thanks in advance.

Ankur · Accepted Answer · 2013-06-05 10:26:50Z

8

(goog.events.KeyHandler. input-container) is calling the KeyHandler as constructor hence it is equals to this js code : new goog.events.KeyHandler(input-container);

(. input-container -gEditableHandler) is accessing the property gEditableHandler of input-container, the - before gEditableHandler indicate to the compiler that it is a property access and not a method call (as method call also have same syntax i.e (. obj method))

answered Jun 5, 2013 at 10:26

Ankur

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