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hologram

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Full stack isomorphic Elixir web framework that can be used on top of Phoenix.

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hologram assets js events scroll_event.mjs
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assets/js/events/scroll_event.mjs 

"use strict";



import Type from "../type.mjs";



export default class ScrollEvent {

  // The DOM scroll event is not cancelable, so preventDefault would be a no-op.

  static isDefaultAllowed = true;



  static buildOperationParam(event) {

    const target = event.target;



    // A window or document scroll fires on the document, whose scroll offsets live on the scrolling

    // element (the viewport scroller), not on the document itself. An element scroll fires on the

    // element, which carries its own offsets.

    const scroller = target === document ? document.scrollingElement : target;



    return Type.map([

      [Type.atom("scroll_left"), Type.float(scroller.scrollLeft)],

      [Type.atom("scroll_top"), Type.float(scroller.scrollTop)],

    ]);

  }



  static isEventIgnored(_event) {

    return false;

  }

}