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webcomponent

a guest Nov 21st, 2019 111 Never
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  1. (ns simple-reagent-webcomponent (:require [reagent.core :as re]))
  2.  
  3. (defn webcomponent! [name view-component]
  4.   (let [;; defines the constructor function, which is the "class" object used by the customElements api
  5.         component (fn component [] (let [e
  6.                                          ;; this is the equivalent of the call to "super"
  7.                                          (js/Reflect.construct js/HTMLElement #js [] component)]
  8.                            (js/console.log (str name ": Constructed!"))
  9.                            (set! (.-shadow e) (.attachShadow e #js {:mode "open"}))
  10.                            e))]
  11.     (set! (.-prototype component)
  12.           ;; establishes prototype hierarchy
  13.           (js/Object.create (.-prototype js/HTMLElement)
  14.                             #js {:connectedCallback
  15.                                  #js {:configurable true
  16.                                       :value        (fn []
  17.                                                       (this-as this
  18.                                                         ;; attaches the reagent process to the shadow dom
  19.                                                         (re/render [view-component] (.-shadow this))
  20.                                                         (js/console.log (str name ": Connected! ") this)))}}))
  21.  
  22.     ;;finally, defines the component with these values
  23.     (js/window.customElements.define name component)
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