bootswatch/docs/_assets/js/custom.js

/* globals bootstrap:false, Prism:false */

(function () {
  'use strict';

  //  Helper functions
  function escapeHtml(html) {
    return html.replace(/×/g, '×')
               .replace(/«/g, '«')
               .replace(/»/g, '»')
               .replace(/←/g, '←')
               .replace(/→/g, '→');
  }

  function cleanSource(html) {
    // Escape HTML, split the lines to an Array, remove empty elements
    // and finally remove the last element
    let lines = escapeHtml(html).split('\n').filter(Boolean).slice(0, -1);
    const indentSize = lines[0].length - lines[0].trim().length;
    const re = new RegExp(' {' + indentSize + '}');

    lines = lines.map(line => {
      return re.test(line) ? line.slice(Math.max(0, indentSize)) : line;
    });

    return lines.join('\n');
  }

  // Add/remove `.navbar-transparent` on scroll; should probably be throttled later
  function addNavbarTransparentClass() {
    const navBarElement = document.querySelector('#home > .navbar');

    if (!navBarElement) {
      return;
    }

    window.addEventListener('scroll', () => {
      const scroll = document.documentElement.scrollTop;

      if (scroll > 50) {
        navBarElement.classList.remove('navbar-transparent');
      } else {
        navBarElement.classList.add('navbar-transparent');
      }
    });
  }

  // Add source modals
  function addSourceModals() {
    const sourceModalElement = document.getElementById('source-modal');

    if (!sourceModalElement) {
      return;
    }

    document.body.addEventListener('click', event => {
      if (!event.target.matches('.source-button')) {
        return;
      }

      const sourceModal = new bootstrap.Modal(sourceModalElement);
      let html = event.target.parentNode.innerHTML;

      html = Prism.highlight(cleanSource(html), Prism.languages.html, 'html');

      sourceModalElement.querySelector('code').innerHTML = html;
      sourceModal.show();
    }, false);
  }

  addNavbarTransparentClass();

  addSourceModals();

  // Prevent empty `a` elements or `submit` buttons from navigating away
  const targets = document.querySelectorAll('[href="#"], [type="submit"]');

  for (const element of targets) {
    element.addEventListener('click', event => {
      event.preventDefault();
    });
  }

  // Add the "View Source" buttons in each component
  const bsComponents = document.querySelectorAll('.bs-component');

  for (const element of bsComponents) {
    const button = '<button class="source-button btn btn-primary btn-xs" type="button" tabindex="0">&lt; &gt;</button>';
    element.insertAdjacentHTML('beforeend', button);
  }

  // Initialize popovers
  const popoverElements = document.querySelectorAll('[data-bs-toggle="popover"]');

  for (const popover of popoverElements) {
    new bootstrap.Popover(popover); // eslint-disable-line no-new
  }

  // Initialize tooltips
  const tooltipElements = document.querySelectorAll('[data-bs-toggle="tooltip"]');

  for (const tooltip of tooltipElements) {
    new bootstrap.Tooltip(tooltip); // eslint-disable-line no-new
  }
})();