bible/assets/app.js

// Page startup and verse modal wiring.
//
// shell.html is static and ships with an empty #content, so the first thing
// every load does is fetch the fragment its URL names and swap it in. That is
// the same request a boosted link makes, so there is one path into #content
// and nothing special about a first visit.
//
// The rest is the modal: the markup lives in shell.html and the bookmark lives
// in the service worker, so all this file does is decide which verse was
// clicked, fill the form, and show it -- Bootstrap handles opening, dismissing
// and focus, and htmx carries the save.
(function () {
  'use strict';

  var currentUrl = '';

  function modalEl() {
    return document.getElementById('verse-dialog');
  }

  function status(text) {
    var el = document.getElementById('verse-dialog-status');
    if (el) el.textContent = text || '';
    return el;
  }

  // navigator.clipboard only exists in a secure context, so over plain http
  // this always falls through to a selectable field rather than failing.
  function copyLink(url) {
    if (navigator.clipboard && window.isSecureContext) {
      navigator.clipboard.writeText(url).then(function () {
        status('Link copied.');
      }, function () { offerManualCopy(url); });
    } else {
      offerManualCopy(url);
    }
  }

  function offerManualCopy(url) {
    var el = status('Copy this link:');
    if (!el) return;
    var field = document.createElement('input');
    field.type = 'text';
    field.readOnly = true;
    field.value = url;
    field.className = 'verse-dialog-url form-control form-control-sm mt-2';
    el.appendChild(field);
    field.focus();
    field.select();
  }

  // -- verse numbers ------------------------------------------------------

  function verseInfo(span) {
    var article = document.querySelector('article.book');
    var section = span.closest('.chapter');
    var book = article
      ? (article.getAttribute('data-name') || article.getAttribute('data-book'))
      : '';
    var chapter = section ? section.getAttribute('data-chapter') : '';
    var page = location.pathname.split('/').pop() || 'index.html';
    return {
      ref: book + ' ' + chapter + ':' + (span.textContent || '').trim(),
      // Relative, so a saved bookmark survives a change of host or port.
      href: page + '#' + span.id,
      url: location.origin + location.pathname + '#' + span.id
    };
  }

  function openFor(span) {
    var el = modalEl();
    if (!el || !window.bootstrap) return;
    var info = verseInfo(span);
    currentUrl = info.url;
    document.getElementById('verse-dialog-ref').textContent = info.ref;
    el.querySelector('input[name="ref"]').value = info.ref;
    el.querySelector('input[name="href"]').value = info.href;
    status('');
    window.bootstrap.Modal.getOrCreateInstance(el).show();
  }

  function hideModal() {
    var el = modalEl();
    if (!el || !window.bootstrap) return;
    var instance = window.bootstrap.Modal.getInstance(el);
    if (instance) instance.hide();
  }

  // Applied here rather than baked into the HTML: without this script the
  // numbers are plain text, and announcing them as buttons would lie. It also
  // earns Reboot's [role=button]{cursor:pointer}. Runs again after every htmx
  // swap, because the new verses arrive bare.
  function markVerses(root) {
    var verses = (root || document).querySelectorAll('.chapter .v');
    for (var i = 0; i < verses.length; i++) {
      verses[i].setAttribute('role', 'button');
      verses[i].setAttribute('tabindex', '0');
      verses[i].setAttribute('aria-label',
        'Verse ' + (verses[i].textContent || '').trim() + ', options');
    }
  }

  // Delegated at the document, so it survives swaps and is bound only once.
  // Dismissal is not handled here: the close button carries data-bs-dismiss,
  // and Bootstrap owns the backdrop and Escape.
  document.addEventListener('click', function (event) {
    if (!event.target.closest) return;
    var verse = event.target.closest('.v');
    if (verse && verse.id) { event.preventDefault(); openFor(verse); return; }
    if (event.target.closest('[data-action="copy"]')) copyLink(currentUrl);
  });

  document.addEventListener('keydown', function (event) {
    if (event.key !== 'Enter' && event.key !== ' ') return;
    var el = document.activeElement;
    if (el && el.classList && el.classList.contains('v') && el.id) {
      event.preventDefault();
      openFor(el);
    }
  });

  // Close the modal once a bookmark write has come back and swapped, leaving
  // the status line up long enough to be read.
  document.body.addEventListener('htmx:afterSwap', function (event) {
    markVerses(event.target);
    if (event.detail.target && event.detail.target.id === 'bookmark') {
      setTimeout(hideModal, 900);
    }
  });

  // -- startup ------------------------------------------------------------

  function fragmentUrl() {
    return (location.pathname.split('/').pop() || 'index.html') + location.search;
  }

  // The content arrives after the document has been parsed, so the browser has
  // long given up on the fragment identifier by the time the verse exists.
  // Doing it here is what makes a link to GEN.html#v1_1 land on the verse.
  function scrollToHash() {
    if (!location.hash) return;
    var el = document.getElementById(decodeURIComponent(location.hash.slice(1)));
    if (el) el.scrollIntoView();
  }

  // api/bookmark has no origin server -- it is answered by the worker -- so
  // there is nothing to ask until the worker is controlling this page.
  // controller, not ready: ready can resolve a tick before clients.claim()
  // takes effect, and a request sent in that gap reaches the network and 404s.
  function whenControlled(fn) {
    if (!('serviceWorker' in navigator)) return;
    if (navigator.serviceWorker.controller) return fn();
    navigator.serviceWorker.addEventListener('controllerchange', fn, { once: true });
  }

  // Deferred scripts run before DOMContentLoaded fires, so this always lands,
  // and it lands after htmx has processed the shell.
  document.addEventListener('DOMContentLoaded', function () {
    htmx.ajax('GET', fragmentUrl(), { target: '#content', swap: 'innerHTML' })
      .then(scrollToHash);

    // Registered from the page it is going to serve, not from a page of its
    // own: there is nothing to wait for and nothing to reload. This load is
    // already the real app -- the worker installs alongside it, and takes over
    // for the bookmark, the offline download and every request from then on.
    if ('serviceWorker' in navigator) {
      navigator.serviceWorker.register('sw.js').catch(function () {});
    }
    whenControlled(function () {
      document.body.dispatchEvent(new CustomEvent('worker-ready'));
    });
  });
})();