fix js structure

public/js/legal-ui.js

@@ -1,18 +1,22 @@
 (function (ns) {
   'use strict';
 
-  const dialog = document.getElementById('info-dialog');
-  const title = document.getElementById('info-dialog-title');
-  const menu = document.getElementById('info-menu');
-  const backButton = document.getElementById('info-back');
-  const closeButton = document.getElementById('info-close');
-  const infoButton = document.getElementById('info-button');
   const pageTitles = Object.freeze({
     privacy: 'Datenschutzerklärung',
     imprint: 'Impressum',
     technology: 'Cookies und Technik'
   });
 
+  const menuEntries = Object.freeze([
+    ['privacy', 'Datenschutzerklärung'],
+    ['imprint', 'Impressum'],
+    ['technology', 'Cookies und verwendete JavaScripts']
+  ]);
+
+  let elements = null;
+  let dropdownOpen = false;
+  let documentEventsBound = false;
+
   function ready(callback) {
     if (document.readyState === 'loading') {
       document.addEventListener('DOMContentLoaded', callback, { once: true });
@@ -21,7 +25,22 @@
     callback();
   }
 
+  function byId(id) {
+    return typeof document.getElementById === 'function' ? document.getElementById(id) : null;
+  }
+
+  function qs(selector, root = document) {
+    return root && typeof root.querySelector === 'function' ? root.querySelector(selector) : null;
+  }
+
+  function qsa(selector, root = document) {
+    if (root && typeof root.querySelectorAll === 'function') return Array.from(root.querySelectorAll(selector));
+    if (root !== document && typeof document.querySelectorAll === 'function') return Array.from(document.querySelectorAll(selector));
+    return [];
+  }
+
   function createElement(tagName, attributes = {}, text = '') {
+    if (typeof document.createElement !== 'function') return null;
     const element = document.createElement(tagName);
     Object.entries(attributes).forEach(([name, value]) => {
       if (value === null || value === undefined) return;
@@ -41,20 +60,52 @@
     return element;
   }
 
-  function ensureInfoControl() {
+  function setAttribute(element, name, value) {
-    let control = document.querySelector('.info-control');
+    if (!element || typeof element.setAttribute !== 'function') return;
-    let button = document.getElementById('info-button')
+    element.setAttribute(name, value);
-      ?? document.querySelector('[aria-controls="info-dropdown"], .info-button');
+  }
-    let dropdown = document.getElementById('info-dropdown')
-      ?? document.querySelector('.info-dropdown');
 
-    if (!control) {
+  function toggleClass(element, className, enabled) {
+    if (!element || !element.classList) return;
+    if (typeof element.classList.toggle === 'function') {
+      element.classList.toggle(className, enabled);
+      return;
+    }
+    if (enabled && typeof element.classList.add === 'function') element.classList.add(className);
+    if (!enabled && typeof element.classList.remove === 'function') element.classList.remove(className);
+  }
+
+  function append(parent, child) {
+    if (!parent || !child || typeof parent.appendChild !== 'function') return false;
+    parent.appendChild(child);
+    return true;
+  }
+
+  function prependToBody(element) {
+    if (!document.body || !element) return false;
+    if (typeof document.body.prepend === 'function') {
+      document.body.prepend(element);
+      return true;
+    }
+    if (typeof document.body.insertBefore === 'function') {
+      document.body.insertBefore(element, document.body.firstChild ?? null);
+      return true;
+    }
+    return append(document.body, element);
+  }
+
+  function ensureInfoControl() {
+    let control = qs('.info-control');
+    let infoButton = byId('info-button') || qs('.info-button');
+    let dropdown = byId('info-dropdown') || qs('.info-dropdown');
+
+    if (!control && typeof document.createElement === 'function') {
       control = createElement('div', { className: 'info-control' });
-      document.body.insertBefore(control, document.body.firstChild);
+      prependToBody(control);
     }
 
-    if (!button) {
+    if (!infoButton && control) {
-      button = createElement('button', {
+      infoButton = createElement('button', {
         id: 'info-button',
         className: 'info-button',
         type: 'button',
@@ -62,217 +113,226 @@
         title: 'Informationen'
       });
       const icon = createElement('span', { 'aria-hidden': 'true' }, 'i');
-      button.appendChild(icon);
+      append(infoButton, icon);
+      append(control, infoButton);
     }
 
-    if (button.parentElement !== control) {
+    if (!dropdown && control) {
-      control.insertBefore(button, control.firstChild);
-    }
-
-    button.id = 'info-button';
-    button.classList.add('info-button');
-    button.setAttribute('type', 'button');
-    button.setAttribute('aria-haspopup', 'true');
-    button.setAttribute('aria-expanded', 'false');
-    button.setAttribute('aria-controls', 'info-dropdown');
-    if (!button.getAttribute('aria-label')) button.setAttribute('aria-label', 'Informationsmenü öffnen');
-    if (!button.textContent.trim()) {
-      const icon = createElement('span', { 'aria-hidden': 'true' }, 'i');
-      button.appendChild(icon);
-    }
-
-    if (!dropdown) {
       dropdown = createElement('nav', {
         id: 'info-dropdown',
         className: 'info-dropdown',
         'aria-label': 'Rechtliche und technische Informationen'
       });
+      append(control, dropdown);
     }
 
-    if (dropdown.parentElement !== control) {
+    if (infoButton) {
-      control.appendChild(dropdown);
+      setAttribute(infoButton, 'type', 'button');
-    }
+      setAttribute(infoButton, 'aria-haspopup', 'true');
-
+      setAttribute(infoButton, 'aria-expanded', 'false');
-    dropdown.id = 'info-dropdown';
+      setAttribute(infoButton, 'aria-controls', 'info-dropdown');
-    dropdown.classList.add('info-dropdown');
+      if (typeof infoButton.getAttribute !== 'function' || !infoButton.getAttribute('aria-label')) {
-    dropdown.setAttribute('aria-label', dropdown.getAttribute('aria-label') ?? 'Rechtliche und technische Informationen');
+        setAttribute(infoButton, 'aria-label', 'Informationsmenü öffnen');
-    dropdown.hidden = true;
-
-    menuEntries.forEach(([target, label]) => {
-      let menuButton = dropdown.querySelector(`[data-info-target="${target}"]`);
-      if (!menuButton) {
-        menuButton = createElement('button', {
-          type: 'button',
-          dataset: { infoTarget: target }
-        }, label);
-        dropdown.appendChild(menuButton);
       }
-      menuButton.setAttribute('type', 'button');
+      if (!String(infoButton.textContent ?? '').trim() && typeof document.createElement === 'function') {
-      menuButton.dataset.infoTarget = target;
+        append(infoButton, createElement('span', { 'aria-hidden': 'true' }, 'i'));
-      if (!menuButton.textContent.trim()) menuButton.textContent = label;
+      }
-    });
+    }
 
-    return { control, button, dropdown };
+    if (dropdown) {
-  }
+      setAttribute(dropdown, 'aria-label', 'Rechtliche und technische Informationen');
+      dropdown.hidden = true;
 
-  function moveExistingPagesInto(content, dialog) {
+      menuEntries.forEach(([target, label]) => {
-    dialog.querySelectorAll('[data-info-page]').forEach(page => {
+        let button = qs(`[data-info-target="${target}"]`, dropdown)
-      if (page.parentElement !== content) content.appendChild(page);
+          || qsa('[data-info-target]').find(item => item.dataset?.infoTarget === target);
-    });
+        if (!button && typeof document.createElement === 'function') {
+          button = createElement('button', {
+            type: 'button',
+            dataset: { infoTarget: target }
+          }, label);
+          append(dropdown, button);
+        }
+        if (!button) return;
+        setAttribute(button, 'type', 'button');
+        button.dataset.infoTarget = target;
+        if (!String(button.textContent ?? '').trim()) button.textContent = label;
+      });
+    }
+
+    return { control, infoButton, dropdown };
   }
 
   function ensureInfoPage(content, name) {
-    let page = content.querySelector(`[data-info-page="${name}"]`)
+    let page = qs(`[data-info-page="${name}"]`, content) || qs(`[data-info-page="${name}"]`);
-      ?? document.querySelector(`[data-info-page="${name}"]`);
+    if (!page && content) {
-
-    if (!page) {
       page = createElement('article', {
         className: 'info-page',
         dataset: { infoPage: name }
       });
-      page.appendChild(createElement('p', {}, `${pageTitles[name]} ist noch nicht hinterlegt.`));
+      append(page, createElement('p', {}, `${pageTitles[name]} ist noch nicht hinterlegt.`));
-      content.appendChild(page);
+      append(content, page);
+    }
+    if (page) {
+      page.dataset.infoPage = name;
+      if (name !== 'privacy') page.hidden = true;
     }
-
-    page.classList.add('info-page');
-    page.dataset.infoPage = name;
-    page.hidden = true;
-    if (page.parentElement !== content) content.appendChild(page);
     return page;
   }
 
   function ensureInfoDialog() {
-    let dialog = document.getElementById('info-dialog');
+    let dialog = byId('info-dialog') || qs('#info-dialog');
-    if (!dialog) {
+    let title = byId('info-dialog-title') || qs('#info-dialog-title', dialog);
+    let closeButton = byId('info-close') || qs('#info-close', dialog);
+    let content = qs('.info-dialog-content', dialog) || qs('.info-dialog-content');
+
+    if (!dialog && typeof document.createElement === 'function') {
       dialog = createElement('dialog', {
         id: 'info-dialog',
         className: 'info-dialog',
         'aria-labelledby': 'info-dialog-title'
       });
-      document.body.appendChild(dialog);
+      append(document.body, dialog);
     }
 
-    dialog.id = 'info-dialog';
+    if (dialog && (!title || !closeButton || !content) && typeof document.createElement === 'function') {
-    dialog.classList.add('info-dialog');
+      let shell = qs('.info-dialog-shell', dialog);
-    dialog.setAttribute('aria-labelledby', 'info-dialog-title');
+      if (!shell) {
+        shell = createElement('div', { className: 'info-dialog-shell' });
+        append(dialog, shell);
+      }
 
-    let shell = dialog.querySelector('.info-dialog-shell');
+      let header = qs('.info-dialog-header', shell);
-    if (!shell) {
+      if (!header) {
-      shell = createElement('div', { className: 'info-dialog-shell' });
+        header = createElement('header', { className: 'info-dialog-header' });
-      while (dialog.firstChild) shell.appendChild(dialog.firstChild);
+        append(shell, header);
-      dialog.appendChild(shell);
+      }
+
+      if (!title) {
+        title = createElement('h2', { id: 'info-dialog-title' }, pageTitles.privacy);
+        append(header, title);
+      }
+
+      if (!closeButton) {
+        closeButton = createElement('button', {
+          id: 'info-close',
+          type: 'button',
+          'aria-label': 'Informationsfenster schließen',
+          title: 'Schließen'
+        }, '×');
+        append(header, closeButton);
+      }
+
+      if (!content) {
+        content = createElement('div', { className: 'info-dialog-content' });
+        append(shell, content);
+      }
     }
 
-    let header = shell.querySelector('.info-dialog-header');
+    if (dialog) {
-    if (!header) {
+      setAttribute(dialog, 'aria-labelledby', 'info-dialog-title');
-      header = createElement('header', { className: 'info-dialog-header' });
+    }
-      shell.insertBefore(header, shell.firstChild);
+    if (closeButton) {
+      setAttribute(closeButton, 'type', 'button');
+      setAttribute(closeButton, 'aria-label', 'Informationsfenster schließen');
+      if (!String(closeButton.textContent ?? '').trim()) closeButton.textContent = '×';
     }
 
-    let title = document.getElementById('info-dialog-title')
+    if (content) {
-      ?? header.querySelector('h1, h2, .info-dialog-title');
+      Object.keys(pageTitles).forEach(name => ensureInfoPage(content, name));
-    if (!title) {
-      title = createElement('h2', { id: 'info-dialog-title' }, 'Informationen');
-      header.insertBefore(title, header.firstChild);
     }
-    title.id = 'info-dialog-title';
-    if (!title.textContent.trim()) title.textContent = 'Informationen';
-
-    let closeButton = document.getElementById('info-close')
-      ?? header.querySelector('[data-info-close], .info-close, .info-dialog-close, button[aria-label="Dialog schließen"], button[aria-label="Schließen"]');
-    if (!closeButton) {
-      closeButton = createElement('button', {
-        id: 'info-close',
-        type: 'button',
-        'aria-label': 'Informationsfenster schließen',
-        title: 'Schließen'
-      }, '×');
-      header.appendChild(closeButton);
-    }
-    closeButton.id = 'info-close';
-    closeButton.setAttribute('type', 'button');
-    closeButton.setAttribute('aria-label', closeButton.getAttribute('aria-label') ?? 'Informationsfenster schließen');
-    closeButton.setAttribute('title', closeButton.getAttribute('title') ?? 'Schließen');
-    if (!closeButton.textContent.trim()) closeButton.textContent = '×';
-    if (closeButton.parentElement !== header) header.appendChild(closeButton);
-
-    let content = shell.querySelector('.info-dialog-content');
-    if (!content) {
-      content = createElement('div', { className: 'info-dialog-content' });
-      shell.appendChild(content);
-    }
-
-    moveExistingPagesInto(content, dialog);
-    Object.keys(pageTitles).forEach(name => ensureInfoPage(content, name));
 
     return { dialog, title, closeButton, content };
   }
 
   function ensureInfoUi() {
-    const control = ensureInfoControl();
-    const dialog = ensureInfoDialog();
     return {
-      control: control.control,
+      ...ensureInfoControl(),
-      infoButton: control.button,
+      ...ensureInfoDialog()
-      dropdown: control.dropdown,
-      dialog: dialog.dialog,
-      title: dialog.title,
-      closeButton: dialog.closeButton,
-      content: dialog.content
     };
   }
 
   function isActivation(event) {
+    if (!event) return false;
+    if (event.type === 'pointerup') {
+      if (event.isPrimary === false) return false;
+      if (event.pointerType === 'mouse' && event.button !== 0) return false;
+      return true;
+    }
     if (event.type === 'keydown') return event.key === 'Enter' || event.key === ' ';
-    if (event.type !== 'pointerup') return false;
+    return false;
-    if (event.isPrimary === false) return false;
-    return event.pointerType !== 'mouse' || event.button === 0;
   }
 
   function activate(element, handler) {
+    if (!element || typeof element.addEventListener !== 'function') return;
+    if (element.dataset) {
+      const key = handler.name ? `wegwichtelLegalUiBound${handler.name}` : 'wegwichtelLegalUiBound';
+      if (element.dataset[key] === 'true') return;
+      element.dataset[key] = 'true';
+    }
     element.addEventListener('pointerup', event => {
       if (!isActivation(event)) return;
-      event.preventDefault();
+      if (typeof event.preventDefault === 'function') event.preventDefault();
-      event.stopPropagation();
+      if (typeof event.stopPropagation === 'function') event.stopPropagation();
       handler(event);
     });
     element.addEventListener('keydown', event => {
       if (!isActivation(event)) return;
-      event.preventDefault();
+      if (typeof event.preventDefault === 'function') event.preventDefault();
-      event.stopPropagation();
+      if (typeof event.stopPropagation === 'function') event.stopPropagation();
       handler(event);
     });
   }
 
-  function syncStorageToggles() {
+  function setDropdownOpen(open) {
-    const enabled = isProgressStorageEnabled();
+    if (!elements?.dropdown || !elements?.infoButton) return;
-    document.querySelectorAll('.progress-storage-toggle').forEach(toggle => {
+    dropdownOpen = Boolean(open);
-      toggle.checked = enabled;
+    elements.dropdown.hidden = !dropdownOpen;
-    });
+    toggleClass(elements.dropdown, 'is-open', dropdownOpen);
-    document.querySelectorAll('.cookie-toggle').forEach(toggle => {
+    setAttribute(elements.infoButton, 'aria-expanded', dropdownOpen ? 'true' : 'false');
-      toggle.checked = false;
-    });
   }
 
-  function showMenu() {
+  function toggleDropdown() {
-    title.textContent = 'Informationen';
+    setDropdownOpen(!dropdownOpen);
-    menu.hidden = false;
+  }
-    backButton.hidden = true;
+
-    document.querySelectorAll('[data-info-page]').forEach(page => {
+  function elementContains(element, target) {
-      page.hidden = true;
+    if (!element || !target) return false;
+    if (element === target) return true;
+    return typeof element.contains === 'function' && element.contains(target);
+  }
+
+  function isInsideInfoControl(target) {
+    return elementContains(elements?.infoButton, target) || elementContains(elements?.dropdown, target);
+  }
+
+  function isProgressStorageEnabled() {
+    if (!ns.PrivacyStorage || typeof ns.PrivacyStorage.isProgressStorageEnabled !== 'function') return false;
+    return ns.PrivacyStorage.isProgressStorageEnabled();
+  }
+
+  function setProgressStorageEnabled(enabled) {
+    if (!ns.PrivacyStorage || typeof ns.PrivacyStorage.setProgressStorageEnabled !== 'function') return false;
+    return ns.PrivacyStorage.setProgressStorageEnabled(enabled);
+  }
+
+  function syncStorageToggles() {
+    const enabled = isProgressStorageEnabled();
+    qsa('.progress-storage-toggle').forEach(toggle => {
+      toggle.checked = enabled;
+    });
+    qsa('.cookie-toggle').forEach(toggle => {
+      toggle.checked = false;
     });
   }
 
   function showPage(name) {
     const pageName = Object.prototype.hasOwnProperty.call(pageTitles, name) ? name : 'privacy';
-    const page = elements?.content?.querySelector(`[data-info-page="${pageName}"]`)
+    const page = qs(`[data-info-page="${pageName}"]`, elements?.content) || qs(`[data-info-page="${pageName}"]`);
-      ?? document.querySelector(`[data-info-page="${pageName}"]`);
     if (!page) return;
 
-    title.textContent = pageTitles[name] ?? 'Informationen';
+    if (elements?.title) elements.title.textContent = pageTitles[pageName] ?? 'Informationen';
-    menu.hidden = true;
+    qsa('[data-info-page]').forEach(item => {
-    backButton.hidden = false;
-    document.querySelectorAll('[data-info-page]').forEach(item => {
       item.hidden = item !== page;
     });
     if (elements?.content) elements.content.scrollTop = 0;
@@ -287,25 +347,32 @@
     }
   }
 
-  function openDialog() {
+  function openDialog(name = 'privacy') {
-    if (dialog.open) return;
+    if (!elements?.dialog) return;
-    showMenu();
+    const pageName = Object.prototype.hasOwnProperty.call(pageTitles, name) ? name : 'privacy';
+    setDropdownOpen(false);
+    showPage(pageName);
     syncStorageToggles();
-    if (typeof dialog.showModal === 'function') dialog.showModal();
+    if (!elements.dialog.open) {
-    else dialog.setAttribute('open', '');
+      if (typeof elements.dialog.showModal === 'function') elements.dialog.showModal();
-    closeButton.focus();
+      else setAttribute(elements.dialog, 'open', '');
+    }
+    focusSafely(elements.closeButton ?? elements.dialog);
   }
 
   function closeDialog() {
-    if (typeof dialog.close === 'function') dialog.close();
+    if (elements?.dialog) {
-    else dialog.removeAttribute('open');
+      if (typeof elements.dialog.close === 'function') elements.dialog.close();
-    infoButton.focus();
+      else if (typeof elements.dialog.removeAttribute === 'function') elements.dialog.removeAttribute('open');
+    }
+    setDropdownOpen(false);
+    focusSafely(elements?.infoButton);
   }
 
   function bindStorageToggles() {
-    document.querySelectorAll('.progress-storage-toggle').forEach(toggle => {
+    qsa('.progress-storage-toggle').forEach(toggle => {
-      if (toggle.dataset.wegwichtelStorageBound === 'true') return;
+      if (toggle.dataset?.wegwichtelStorageBound === 'true') return;
-      toggle.dataset.wegwichtelStorageBound = 'true';
+      if (toggle.dataset) toggle.dataset.wegwichtelStorageBound = 'true';
       toggle.addEventListener('change', event => {
         const enabled = setProgressStorageEnabled(event.currentTarget.checked);
         syncStorageToggles();
@@ -316,23 +383,38 @@
     });
   }
 
-  activate(infoButton, openDialog);
+  function bindDialog() {
-  activate(closeButton, closeDialog);
+    activate(elements?.infoButton, toggleDropdown);
-  activate(backButton, showMenu);
+    activate(elements?.closeButton, closeDialog);
-  document.querySelectorAll('[data-info-target]').forEach(button => {
-    activate(button, () => showPage(button.dataset.infoTarget));
-  });
 
-    if (elements.dialog.dataset.wegwichtelLegalUiDialogBound !== 'true') {
+    qsa('[data-info-target]', elements?.dropdown).forEach(button => {
-      elements.dialog.dataset.wegwichtelLegalUiDialogBound = 'true';
+      activate(button, () => openDialog(button.dataset?.infoTarget));
+    });
+
+    if (!documentEventsBound) {
+      documentEventsBound = true;
+      document.addEventListener('pointerup', event => {
+        if (!dropdownOpen || isInsideInfoControl(event.target)) return;
+        setDropdownOpen(false);
+      });
+      document.addEventListener('keydown', event => {
+        if (!dropdownOpen || event.key !== 'Escape' || elements?.dialog?.open) return;
+        if (typeof event.preventDefault === 'function') event.preventDefault();
+        setDropdownOpen(false);
+        focusSafely(elements?.infoButton);
+      });
+    }
+
+    if (elements?.dialog && elements.dialog.dataset?.wegwichtelLegalUiDialogBound !== 'true') {
+      if (elements.dialog.dataset) elements.dialog.dataset.wegwichtelLegalUiDialogBound = 'true';
       elements.dialog.addEventListener('pointerup', event => {
         if (event.target !== elements.dialog || !isActivation(event)) return;
-        event.preventDefault();
+        if (typeof event.preventDefault === 'function') event.preventDefault();
-        event.stopPropagation();
+        if (typeof event.stopPropagation === 'function') event.stopPropagation();
         closeDialog();
       });
       elements.dialog.addEventListener('cancel', event => {
-        event.preventDefault();
+        if (typeof event.preventDefault === 'function') event.preventDefault();
         closeDialog();
       });
     }
@@ -353,5 +435,5 @@
     });
   }
 
-  ns.LegalUi = Object.freeze({ open: openDialog, close: closeDialog, syncStorageToggles });
+  ready(init);
-}(globalThis.Wegwichtel ??= {}));
+}(globalThis.Wegwichtel = globalThis.Wegwichtel || {}));