[web-client] simple theme: move sources to client/simple/src

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

8 files changed, 1252 insertions, 0 deletions

diff --git a/client/simple/src/js/head/00_init.js b/client/simple/src/js/head/00_init.js
new file mode 100644
index 000000000..a7c61c43e
--- /dev/null
+++ b/client/simple/src/js/head/00_init.js
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+(function (w, d) {
+  'use strict';
+
+  // add data- properties
+  var script = d.currentScript  || (function () {
+    var scripts = d.getElementsByTagName('script');
+    return scripts[scripts.length - 1];
+  })();
+
+  w.searxng = {
+    settings: JSON.parse(atob(script.getAttribute('client_settings')))
+  };
+
+  // update the css
+  var htmlElement = d.getElementsByTagName("html")[0];
+  htmlElement.classList.remove('no-js');
+  htmlElement.classList.add('js');
+
+})(window, document);
diff --git a/client/simple/src/js/main/00_toolkit.js b/client/simple/src/js/main/00_toolkit.js
new file mode 100644
index 000000000..4e374a019
--- /dev/null
+++ b/client/simple/src/js/main/00_toolkit.js
@@ -0,0 +1,165 @@
+/**
+ * @license
+ * (C) Copyright Contributors to the SearXNG project.
+ * (C) Copyright Contributors to the searx project (2014 - 2021).
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+window.searxng = (function (w, d) {
+
+  'use strict';
+
+  // not invented here toolkit with bugs fixed elsewhere
+  // purposes : be just good enough and as small as possible
+
+  // from https://plainjs.com/javascript/events/live-binding-event-handlers-14/
+  if (w.Element) {
+    (function (ElementPrototype) {
+      ElementPrototype.matches = ElementPrototype.matches ||
+      ElementPrototype.matchesSelector ||
+      ElementPrototype.webkitMatchesSelector ||
+      ElementPrototype.msMatchesSelector ||
+      function (selector) {
+        var node = this, nodes = (node.parentNode || node.document).querySelectorAll(selector), i = -1;
+        while (nodes[++i] && nodes[i] != node);
+        return !!nodes[i];
+      };
+    })(Element.prototype);
+  }
+
+  function callbackSafe (callback, el, e) {
+    try {
+      callback.call(el, e);
+    } catch (exception) {
+      console.log(exception);
+    }
+  }
+
+  var searxng = window.searxng || {};
+
+  searxng.on = function (obj, eventType, callback, useCapture) {
+    useCapture = useCapture || false;
+    if (typeof obj !== 'string') {
+      // obj HTMLElement, HTMLDocument
+      obj.addEventListener(eventType, callback, useCapture);
+    } else {
+      // obj is a selector
+      d.addEventListener(eventType, function (e) {
+        var el = e.target || e.srcElement, found = false;
+        while (el && el.matches && el !== d && !(found = el.matches(obj))) el = el.parentElement;
+        if (found) callbackSafe(callback, el, e);
+      }, useCapture);
+    }
+  };
+
+  searxng.ready = function (callback) {
+    if (document.readyState != 'loading') {
+      callback.call(w);
+    } else {
+      w.addEventListener('DOMContentLoaded', callback.bind(w));
+    }
+  };
+
+  searxng.http = function (method, url, data = null) {
+    return new Promise(function (resolve, reject) {
+      try {
+        var req = new XMLHttpRequest();
+        req.open(method, url, true);
+        req.timeout = 20000;
+
+        // On load
+        req.onload = function () {
+          if (req.status == 200) {
+            resolve(req.response, req.responseType);
+          } else {
+            reject(Error(req.statusText));
+          }
+        };
+
+        // Handle network errors
+        req.onerror = function () {
+          reject(Error("Network Error"));
+        };
+
+        req.onabort = function () {
+          reject(Error("Transaction is aborted"));
+        };
+
+        req.ontimeout = function () {
+          reject(Error("Timeout"));
+        }
+
+        // Make the request
+        if (data) {
+          req.send(data)
+        } else {
+          req.send();
+        }
+      } catch (ex) {
+        reject(ex);
+      }
+    });
+  };
+
+  searxng.loadStyle = function (src) {
+    var path = searxng.settings.theme_static_path + "/" + src,
+      id = "style_" + src.replace('.', '_'),
+      s = d.getElementById(id);
+    if (s === null) {
+      s = d.createElement('link');
+      s.setAttribute('id', id);
+      s.setAttribute('rel', 'stylesheet');
+      s.setAttribute('type', 'text/css');
+      s.setAttribute('href', path);
+      d.body.appendChild(s);
+    }
+  };
+
+  searxng.loadScript = function (src, callback) {
+    var path = searxng.settings.theme_static_path + "/" + src,
+      id = "script_" + src.replace('.', '_'),
+      s = d.getElementById(id);
+    if (s === null) {
+      s = d.createElement('script');
+      s.setAttribute('id', id);
+      s.setAttribute('src', path);
+      s.onload = callback;
+      s.onerror = function () {
+        s.setAttribute('error', '1');
+      };
+      d.body.appendChild(s);
+    } else if (!s.hasAttribute('error')) {
+      try {
+        callback.apply(s, []);
+      } catch (exception) {
+        console.log(exception);
+      }
+    } else {
+      console.log("callback not executed : script '" + path + "' not loaded.");
+    }
+  };
+
+  searxng.insertBefore = function (newNode, referenceNode) {
+    referenceNode.parentNode.insertBefore(newNode, referenceNode);
+  };
+
+  searxng.insertAfter = function (newNode, referenceNode) {
+    referenceNode.parentNode.insertAfter(newNode, referenceNode.nextSibling);
+  };
+
+  searxng.on('.close', 'click', function () {
+    this.parentNode.classList.add('invisible');
+  });
+
+  function getEndpoint () {
+    for (var className of d.getElementsByTagName('body')[0].classList.values()) {
+      if (className.endsWith('_endpoint')) {
+        return className.split('_')[0];
+      }
+    }
+    return '';
+  }
+
+  searxng.endpoint = getEndpoint();
+
+  return searxng;
+})(window, document);
diff --git a/client/simple/src/js/main/infinite_scroll.js b/client/simple/src/js/main/infinite_scroll.js
new file mode 100644
index 000000000..07db3305a
--- /dev/null
+++ b/client/simple/src/js/main/infinite_scroll.js
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+/* global searxng */
+
+searxng.ready(function () {
+  'use strict';
+
+  searxng.infinite_scroll_supported = (
+    'IntersectionObserver' in window &&
+    'IntersectionObserverEntry' in window &&
+    'intersectionRatio' in window.IntersectionObserverEntry.prototype);
+
+  if (searxng.endpoint !== 'results') {
+    return;
+  }
+
+  if (!searxng.infinite_scroll_supported) {
+    console.log('IntersectionObserver not supported');
+    return;
+  }
+
+  let d = document;
+  var onlyImages = d.getElementById('results').classList.contains('only_template_images');
+
+  function newLoadSpinner () {
+    var loader = d.createElement('div');
+    loader.classList.add('loader');
+    return loader;
+  }
+
+  function replaceChildrenWith (element, children) {
+    element.textContent = '';
+    children.forEach(child => element.appendChild(child));
+  }
+
+  function loadNextPage (callback) {
+    var form = d.querySelector('#pagination form.next_page');
+    if (!form) {
+      return
+    }
+    replaceChildrenWith(d.querySelector('#pagination'), [ newLoadSpinner() ]);
+    var formData = new FormData(form);
+    searxng.http('POST', d.querySelector('#search').getAttribute('action'), formData).then(
+      function (response) {
+        var nextPageDoc = new DOMParser().parseFromString(response, 'text/html');
+        var articleList = nextPageDoc.querySelectorAll('#urls article');
+        var paginationElement = nextPageDoc.querySelector('#pagination');
+        d.querySelector('#pagination').remove();
+        if (articleList.length > 0 && !onlyImages) {
+          // do not add <hr> element when there are only images
+          d.querySelector('#urls').appendChild(d.createElement('hr'));
+        }
+        articleList.forEach(articleElement => {
+          d.querySelector('#urls').appendChild(articleElement);
+        });
+        if (paginationElement) {
+          d.querySelector('#results').appendChild(paginationElement);
+          callback();
+        }
+      }
+    ).catch(
+      function (err) {
+        console.log(err);
+        var e = d.createElement('div');
+        e.textContent = searxng.settings.translations.error_loading_next_page;
+        e.classList.add('dialog-error');
+        e.setAttribute('role', 'alert');
+        replaceChildrenWith(d.querySelector('#pagination'), [ e ]);
+      }
+    )
+  }
+
+  if (searxng.settings.infinite_scroll && searxng.infinite_scroll_supported) {
+    const intersectionObserveOptions = {
+      rootMargin: "20rem",
+    };
+    const observedSelector = 'article.result:last-child';
+    const observer = new IntersectionObserver(entries => {
+      const paginationEntry = entries[0];
+      if (paginationEntry.isIntersecting) {
+        observer.unobserve(paginationEntry.target);
+        loadNextPage(() => observer.observe(d.querySelector(observedSelector), intersectionObserveOptions));
+      }
+    });
+    observer.observe(d.querySelector(observedSelector), intersectionObserveOptions);
+  }
+
+});
diff --git a/client/simple/src/js/main/keyboard.js b/client/simple/src/js/main/keyboard.js
new file mode 100644
index 000000000..e16134579
--- /dev/null
+++ b/client/simple/src/js/main/keyboard.js
@@ -0,0 +1,461 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+/* global searxng */
+
+searxng.ready(function () {
+
+  function isElementInDetail (el) {
+    while (el !== undefined) {
+      if (el.classList.contains('detail')) {
+        return true;
+      }
+      if (el.classList.contains('result')) {
+        // we found a result, no need to go to the root of the document:
+        // el is not inside a <div class="detail"> element
+        return false;
+      }
+      el = el.parentNode;
+    }
+    return false;
+  }
+
+  function getResultElement (el) {
+    while (el !== undefined) {
+      if (el.classList.contains('result')) {
+        return el;
+      }
+      el = el.parentNode;
+    }
+    return undefined;
+  }
+
+  function isImageResult (resultElement) {
+    return resultElement && resultElement.classList.contains('result-images');
+  }
+
+  searxng.on('.result', 'click', function (e) {
+    if (!isElementInDetail(e.target)) {
+      highlightResult(this)(true, true);
+      let resultElement = getResultElement(e.target);
+      if (isImageResult(resultElement)) {
+        e.preventDefault();
+        searxng.selectImage(resultElement);
+      }
+    }
+  });
+
+  searxng.on('.result a', 'focus', function (e) {
+    if (!isElementInDetail(e.target)) {
+      let resultElement = getResultElement(e.target);
+      if (resultElement && resultElement.getAttribute("data-vim-selected") === null) {
+        highlightResult(resultElement)(true);
+      }
+      if (isImageResult(resultElement)) {
+        searxng.selectImage(resultElement);
+      }
+    }
+  }, true);
+
+  /* common base for layouts */
+  var baseKeyBinding = {
+    'Escape': {
+      key: 'ESC',
+      fun: removeFocus,
+      des: 'remove focus from the focused input',
+      cat: 'Control'
+    },
+    'c': {
+      key: 'c',
+      fun: copyURLToClipboard,
+      des: 'copy url of the selected result to the clipboard',
+      cat: 'Results'
+    },
+    'h': {
+      key: 'h',
+      fun: toggleHelp,
+      des: 'toggle help window',
+      cat: 'Other'
+    },
+    'i': {
+      key: 'i',
+      fun: searchInputFocus,
+      des: 'focus on the search input',
+      cat: 'Control'
+    },
+    'n': {
+      key: 'n',
+      fun: GoToNextPage(),
+      des: 'go to next page',
+      cat: 'Results'
+    },
+    'o': {
+      key: 'o',
+      fun: openResult(false),
+      des: 'open search result',
+      cat: 'Results'
+    },
+    'p': {
+      key: 'p',
+      fun: GoToPreviousPage(),
+      des: 'go to previous page',
+      cat: 'Results'
+    },
+    'r': {
+      key: 'r',
+      fun: reloadPage,
+      des: 'reload page from the server',
+      cat: 'Control'
+    },
+    't': {
+      key: 't',
+      fun: openResult(true),
+      des: 'open the result in a new tab',
+      cat: 'Results'
+    },
+  };
+  var keyBindingLayouts = {
+
+    "default": Object.assign(
+      { /* SearXNG layout */
+        'ArrowLeft': {
+          key: '←',
+          fun: highlightResult('up'),
+          des: 'select previous search result',
+          cat: 'Results'
+        },
+        'ArrowRight': {
+          key: '→',
+          fun: highlightResult('down'),
+          des: 'select next search result',
+          cat: 'Results'
+        },
+      }, baseKeyBinding),
+
+    'vim': Object.assign(
+      { /* Vim-like Key Layout. */
+        'b': {
+          key: 'b',
+          fun: scrollPage(-window.innerHeight),
+          des: 'scroll one page up',
+          cat: 'Navigation'
+        },
+        'f': {
+          key: 'f',
+          fun: scrollPage(window.innerHeight),
+          des: 'scroll one page down',
+          cat: 'Navigation'
+        },
+        'u': {
+          key: 'u',
+          fun: scrollPage(-window.innerHeight / 2),
+          des: 'scroll half a page up',
+          cat: 'Navigation'
+        },
+        'd': {
+          key: 'd',
+          fun: scrollPage(window.innerHeight / 2),
+          des: 'scroll half a page down',
+          cat: 'Navigation'
+        },
+        'g': {
+          key: 'g',
+          fun: scrollPageTo(-document.body.scrollHeight, 'top'),
+          des: 'scroll to the top of the page',
+          cat: 'Navigation'
+        },
+        'v': {
+          key: 'v',
+          fun: scrollPageTo(document.body.scrollHeight, 'bottom'),
+          des: 'scroll to the bottom of the page',
+          cat: 'Navigation'
+        },
+        'k': {
+          key: 'k',
+          fun: highlightResult('up'),
+          des: 'select previous search result',
+          cat: 'Results'
+        },
+        'j': {
+          key: 'j',
+          fun: highlightResult('down'),
+          des: 'select next search result',
+          cat: 'Results'
+        },
+        'y': {
+          key: 'y',
+          fun: copyURLToClipboard,
+          des: 'copy url of the selected result to the clipboard',
+          cat: 'Results'
+        },
+      }, baseKeyBinding)
+  }
+
+  var keyBindings = keyBindingLayouts[searxng.settings.hotkeys] || keyBindingLayouts.default;
+
+  searxng.on(document, "keydown", function (e) {
+    // check for modifiers so we don't break browser's hotkeys
+    if (
+      Object.prototype.hasOwnProperty.call(keyBindings, e.key)
+        && !e.ctrlKey && !e.altKey
+        && !e.shiftKey && !e.metaKey
+    ) {
+      var tagName = e.target.tagName.toLowerCase();
+      if (e.key === 'Escape') {
+        keyBindings[e.key].fun(e);
+      } else {
+        if (e.target === document.body || tagName === 'a' || tagName === 'button') {
+          e.preventDefault();
+          keyBindings[e.key].fun();
+        }
+      }
+    }
+  });
+
+  function highlightResult (which) {
+    return function (noScroll, keepFocus) {
+      var current = document.querySelector('.result[data-vim-selected]'),
+        effectiveWhich = which;
+      if (current === null) {
+        // no selection : choose the first one
+        current = document.querySelector('.result');
+        if (current === null) {
+          // no first one : there are no results
+          return;
+        }
+        // replace up/down actions by selecting first one
+        if (which === "down" || which === "up") {
+          effectiveWhich = current;
+        }
+      }
+
+      var next, results = document.querySelectorAll('.result');
+      results = Array.from(results);  // convert NodeList to Array for further use
+
+      if (typeof effectiveWhich !== 'string') {
+        next = effectiveWhich;
+      } else {
+        switch (effectiveWhich) {
+        case 'visible':
+          var top = document.documentElement.scrollTop || document.body.scrollTop;
+          var bot = top + document.documentElement.clientHeight;
+
+          for (var i = 0; i < results.length; i++) {
+            next = results[i];
+            var etop = next.offsetTop;
+            var ebot = etop + next.clientHeight;
+
+            if ((ebot <= bot) && (etop > top)) {
+              break;
+            }
+          }
+          break;
+        case 'down':
+          next = results[results.indexOf(current) + 1] || current;
+          break;
+        case 'up':
+          next = results[results.indexOf(current) - 1] || current;
+          break;
+        case 'bottom':
+          next = results[results.length - 1];
+          break;
+        case 'top':
+          /* falls through */
+        default:
+          next = results[0];
+        }
+      }
+
+      if (next) {
+        current.removeAttribute('data-vim-selected');
+        next.setAttribute('data-vim-selected', 'true');
+        if (!keepFocus) {
+          var link = next.querySelector('h3 a') || next.querySelector('a');
+          if (link !== null) {
+            link.focus();
+          }
+        }
+        if (!noScroll) {
+          scrollPageToSelected();
+        }
+      }
+    };
+  }
+
+  function reloadPage () {
+    document.location.reload(true);
+  }
+
+  function removeFocus (e) {
+    const tagName = e.target.tagName.toLowerCase();
+    if (document.activeElement && (tagName === 'input' || tagName === 'select' || tagName === 'textarea')) {
+      document.activeElement.blur();
+    } else {
+      searxng.closeDetail();
+    }
+  }
+
+  function pageButtonClick (css_selector) {
+    return function () {
+      var button = document.querySelector(css_selector);
+      if (button) {
+        button.click();
+      }
+    };
+  }
+
+  function GoToNextPage () {
+    return pageButtonClick('nav#pagination .next_page button[type="submit"]');
+  }
+
+  function GoToPreviousPage () {
+    return pageButtonClick('nav#pagination .previous_page button[type="submit"]');
+  }
+
+  function scrollPageToSelected () {
+    var sel = document.querySelector('.result[data-vim-selected]');
+    if (sel === null) {
+      return;
+    }
+    var wtop = document.documentElement.scrollTop || document.body.scrollTop,
+      wheight = document.documentElement.clientHeight,
+      etop = sel.offsetTop,
+      ebot = etop + sel.clientHeight,
+      offset = 120;
+    // first element ?
+    if ((sel.previousElementSibling === null) && (ebot < wheight)) {
+      // set to the top of page if the first element
+      // is fully included in the viewport
+      window.scroll(window.scrollX, 0);
+      return;
+    }
+    if (wtop > (etop - offset)) {
+      window.scroll(window.scrollX, etop - offset);
+    } else {
+      var wbot = wtop + wheight;
+      if (wbot < (ebot + offset)) {
+        window.scroll(window.scrollX, ebot - wheight + offset);
+      }
+    }
+  }
+
+  function scrollPage (amount) {
+    return function () {
+      window.scrollBy(0, amount);
+      highlightResult('visible')();
+    };
+  }
+
+  function scrollPageTo (position, nav) {
+    return function () {
+      window.scrollTo(0, position);
+      highlightResult(nav)();
+    };
+  }
+
+  function searchInputFocus () {
+    window.scrollTo(0, 0);
+    var q = document.querySelector('#q');
+    q.focus();
+    if (q.setSelectionRange) {
+      var len = q.value.length;
+      q.setSelectionRange(len, len);
+    }
+  }
+
+  function openResult (newTab) {
+    return function () {
+      var link = document.querySelector('.result[data-vim-selected] h3 a');
+      if (link === null) {
+        link = document.querySelector('.result[data-vim-selected] > a');
+      }
+      if (link !== null) {
+        var url = link.getAttribute('href');
+        if (newTab) {
+          window.open(url);
+        } else {
+          window.location.href = url;
+        }
+      }
+    };
+  }
+
+  function initHelpContent (divElement) {
+    var categories = {};
+
+    for (var k in keyBindings) {
+      var key = keyBindings[k];
+      categories[key.cat] = categories[key.cat] || [];
+      categories[key.cat].push(key);
+    }
+
+    var sorted = Object.keys(categories).sort(function (a, b) {
+      return categories[b].length - categories[a].length;
+    });
+
+    if (sorted.length === 0) {
+      return;
+    }
+
+    var html = '<a href="#" class="close" aria-label="close" title="close">×</a>';
+    html += '<h3>How to navigate SearXNG with hotkeys</h3>';
+    html += '<table>';
+
+    for (var i = 0; i < sorted.length; i++) {
+      var cat = categories[sorted[i]];
+
+      var lastCategory = i === (sorted.length - 1);
+      var first = i % 2 === 0;
+
+      if (first) {
+        html += '<tr>';
+      }
+      html += '<td>';
+
+      html += '<h4>' + cat[0].cat + '</h4>';
+      html += '<ul class="list-unstyled">';
+
+      for (var cj in cat) {
+        html += '<li><kbd>' + cat[cj].key + '</kbd> ' + cat[cj].des + '</li>';
+      }
+
+      html += '</ul>';
+      html += '</td>'; // col-sm-*
+
+      if (!first || lastCategory) {
+        html += '</tr>'; // row
+      }
+    }
+
+    html += '</table>';
+
+    divElement.innerHTML = html;
+  }
+
+  function toggleHelp () {
+    var helpPanel = document.querySelector('#vim-hotkeys-help');
+    if (helpPanel === undefined || helpPanel === null) {
+      // first call
+      helpPanel = document.createElement('div');
+      helpPanel.id = 'vim-hotkeys-help';
+      helpPanel.className = 'dialog-modal';
+      initHelpContent(helpPanel);
+      var body = document.getElementsByTagName('body')[0];
+      body.appendChild(helpPanel);
+    } else {
+      // toggle hidden
+      helpPanel.classList.toggle('invisible');
+      return;
+    }
+  }
+
+  function copyURLToClipboard () {
+    var currentUrlElement = document.querySelector('.result[data-vim-selected] h3 a');
+    if (currentUrlElement === null) return;
+
+    const url = currentUrlElement.getAttribute('href');
+    navigator.clipboard.writeText(url);
+  }
+
+  searxng.scrollPageToSelected = scrollPageToSelected;
+  searxng.selectNext = highlightResult('down');
+  searxng.selectPrevious = highlightResult('up');
+});
diff --git a/client/simple/src/js/main/mapresult.js b/client/simple/src/js/main/mapresult.js
new file mode 100644
index 000000000..2c3777678
--- /dev/null
+++ b/client/simple/src/js/main/mapresult.js
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+/* global L */
+(function (w, d, searxng) {
+  'use strict';
+
+  searxng.ready(function () {
+    searxng.on('.searxng_init_map', 'click', function (event) {
+      // no more request
+      this.classList.remove("searxng_init_map");
+
+      //
+      var leaflet_target = this.dataset.leafletTarget;
+      var map_lon = parseFloat(this.dataset.mapLon);
+      var map_lat = parseFloat(this.dataset.mapLat);
+      var map_zoom = parseFloat(this.dataset.mapZoom);
+      var map_boundingbox = JSON.parse(this.dataset.mapBoundingbox);
+      var map_geojson = JSON.parse(this.dataset.mapGeojson);
+
+      searxng.loadStyle('css/leaflet.css');
+      searxng.loadScript('js/leaflet.js', function () {
+        var map_bounds = null;
+        if (map_boundingbox) {
+          var southWest = L.latLng(map_boundingbox[0], map_boundingbox[2]);
+          var northEast = L.latLng(map_boundingbox[1], map_boundingbox[3]);
+          map_bounds = L.latLngBounds(southWest, northEast);
+        }
+
+        // init map
+        var map = L.map(leaflet_target);
+        // create the tile layer with correct attribution
+        var osmMapnikUrl = 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
+        var osmMapnikAttrib = 'Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors';
+        var osmMapnik = new L.TileLayer(osmMapnikUrl, {minZoom: 1, maxZoom: 19, attribution: osmMapnikAttrib});
+        var osmWikimediaUrl = 'https://maps.wikimedia.org/osm-intl/{z}/{x}/{y}.png';
+        var osmWikimediaAttrib = 'Wikimedia maps | Maps data © <a href="https://openstreetmap.org">OpenStreetMap contributors</a>';
+        var osmWikimedia = new L.TileLayer(osmWikimediaUrl, {minZoom: 1, maxZoom: 19, attribution: osmWikimediaAttrib});
+        // init map view
+        if (map_bounds) {
+          // TODO hack: https://github.com/Leaflet/Leaflet/issues/2021
+          // Still useful ?
+          setTimeout(function () {
+            map.fitBounds(map_bounds, {
+              maxZoom: 17
+            });
+          }, 0);
+        } else if (map_lon && map_lat) {
+          if (map_zoom) {
+            map.setView(new L.latLng(map_lat, map_lon), map_zoom);
+          } else {
+            map.setView(new L.latLng(map_lat, map_lon), 8);
+          }
+        }
+
+        map.addLayer(osmMapnik);
+
+        var baseLayers = {
+          "OSM Mapnik": osmMapnik,
+          "OSM Wikimedia": osmWikimedia,
+        };
+
+        L.control.layers(baseLayers).addTo(map);
+
+        if (map_geojson) {
+          L.geoJson(map_geojson).addTo(map);
+        } /* else if(map_bounds) {
+          L.rectangle(map_bounds, {color: "#ff7800", weight: 3, fill:false}).addTo(map);
+        } */
+      });
+
+      // this event occur only once per element
+      event.preventDefault();
+    });
+  });
+})(window, document, window.searxng);
diff --git a/client/simple/src/js/main/preferences.js b/client/simple/src/js/main/preferences.js
new file mode 100644
index 000000000..a0b853d61
--- /dev/null
+++ b/client/simple/src/js/main/preferences.js
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+(function (w, d, searxng) {
+  'use strict';
+
+  if (searxng.endpoint !== 'preferences') {
+    return;
+  }
+
+  searxng.ready(function () {
+    let engine_descriptions = null;
+    function load_engine_descriptions () {
+      if (engine_descriptions == null) {
+        searxng.http("GET", "engine_descriptions.json").then(function (content) {
+          engine_descriptions = JSON.parse(content);
+          for (const [engine_name, description] of Object.entries(engine_descriptions)) {
+            let elements = d.querySelectorAll('[data-engine-name="' + engine_name + '"] .engine-description');
+            for (const element of elements) {
+              let source = ' (<i>' + searxng.settings.translations.Source + ':&nbsp;' + description[1] + '</i>)';
+              element.innerHTML = description[0] + source;
+            }
+          }
+        });
+      }
+    }
+
+    for (const el of d.querySelectorAll('[data-engine-name]')) {
+      searxng.on(el, 'mouseenter', load_engine_descriptions);
+    }
+
+    const enableAllEngines = d.querySelectorAll(".enable-all-engines");
+    const disableAllEngines = d.querySelectorAll(".disable-all-engines");
+    const engineToggles = d.querySelectorAll('tbody input[type=checkbox][class~=checkbox-onoff]');
+    const toggleEngines = (enable) => {
+      for (const el of engineToggles) {
+        // check if element visible, so that only engines of the current category are modified
+        if (el.offsetParent !== null) el.checked = !enable;
+      }
+    };
+    for (const el of enableAllEngines) {
+      searxng.on(el, 'click', () => toggleEngines(true));
+    }
+    for (const el of disableAllEngines) {
+      searxng.on(el, 'click', () => toggleEngines(false));
+    }
+
+    const copyHashButton = d.querySelector("#copy-hash");
+    searxng.on(copyHashButton, 'click', (e) => {
+      e.preventDefault();
+      navigator.clipboard.writeText(copyHashButton.dataset.hash);
+      copyHashButton.innerText = copyHashButton.dataset.copiedText;
+    });
+  });
+})(window, document, window.searxng);
diff --git a/client/simple/src/js/main/results.js b/client/simple/src/js/main/results.js
new file mode 100644
index 000000000..cc7c7efcd
--- /dev/null
+++ b/client/simple/src/js/main/results.js
@@ -0,0 +1,181 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+(function (w, d, searxng) {
+  'use strict';
+
+  if (searxng.endpoint !== 'results') {
+    return;
+  }
+
+  searxng.ready(function () {
+    d.querySelectorAll('#urls img').forEach(
+      img =>
+        img.addEventListener(
+          'error', () => {
+            // console.log("ERROR can't load: " + img.src);
+            img.src = window.searxng.settings.theme_static_path + "/img/img_load_error.svg";
+          },
+          {once: true}
+        ));
+
+    if (d.querySelector('#search_url button#copy_url')) {
+      d.querySelector('#search_url button#copy_url').style.display = "block";
+    }
+
+    searxng.on('.btn-collapse', 'click', function () {
+      var btnLabelCollapsed = this.getAttribute('data-btn-text-collapsed');
+      var btnLabelNotCollapsed = this.getAttribute('data-btn-text-not-collapsed');
+      var target = this.getAttribute('data-target');
+      var targetElement = d.querySelector(target);
+      var html = this.innerHTML;
+      if (this.classList.contains('collapsed')) {
+        html = html.replace(btnLabelCollapsed, btnLabelNotCollapsed);
+      } else {
+        html = html.replace(btnLabelNotCollapsed, btnLabelCollapsed);
+      }
+      this.innerHTML = html;
+      this.classList.toggle('collapsed');
+      targetElement.classList.toggle('invisible');
+    });
+
+    searxng.on('.media-loader', 'click', function () {
+      var target = this.getAttribute('data-target');
+      var iframe_load = d.querySelector(target + ' > iframe');
+      var srctest = iframe_load.getAttribute('src');
+      if (srctest === null || srctest === undefined || srctest === false) {
+        iframe_load.setAttribute('src', iframe_load.getAttribute('data-src'));
+      }
+    });
+
+    searxng.on('#copy_url', 'click', function () {
+      var target = this.parentElement.querySelector('pre');
+      navigator.clipboard.writeText(target.innerText);
+      this.innerText = this.dataset.copiedText;
+    });
+
+    // searxng.selectImage (gallery)
+    // -----------------------------
+
+    // setTimeout() ID, needed to cancel *last* loadImage
+    let imgTimeoutID;
+
+    // progress spinner, while an image is loading
+    const imgLoaderSpinner = d.createElement('div');
+    imgLoaderSpinner.classList.add('loader');
+
+    // singleton image object, which is used for all loading processes of a
+    // detailed image
+    const imgLoader = new Image();
+
+    const loadImage = (imgSrc, onSuccess) => {
+      // if defered image load exists, stop defered task.
+      if (imgTimeoutID) clearTimeout(imgTimeoutID);
+
+      // defer load of the detail image for 1 sec
+      imgTimeoutID = setTimeout(() => {
+        imgLoader.src = imgSrc;
+      }, 1000);
+
+      // set handlers in the on-properties
+      imgLoader.onload = () => {
+        onSuccess();
+        imgLoaderSpinner.remove();
+      };
+      imgLoader.onerror = () => {
+        imgLoaderSpinner.remove();
+      };
+    };
+
+    searxng.selectImage = (resultElement) => {
+
+      // add a class that can be evaluated in the CSS and indicates that the
+      // detail view is open
+      d.getElementById('results').classList.add('image-detail-open');
+
+      // add a hash to the browser history so that pressing back doesn't return
+      // to the previous page this allows us to dismiss the image details on
+      // pressing the back button on mobile devices
+      window.location.hash = '#image-viewer';
+
+      searxng.scrollPageToSelected();
+
+      // if there is none element given by the caller, stop here
+      if (!resultElement) return;
+
+      // find <img> object in the element, if there is none, stop here.
+      const img = resultElement.querySelector('.result-images-source img');
+      if (!img) return;
+
+      // <img src="" data-src="http://example.org/image.jpg">
+      const src = img.getAttribute('data-src');
+
+      // already loaded high-res image or no high-res image available
+      if (!src) return;
+
+      // use the image thumbnail until the image is fully loaded
+      const thumbnail = resultElement.querySelector('.image_thumbnail');
+      img.src = thumbnail.src;
+
+      // show a progress spinner
+      const detailElement = resultElement.querySelector('.detail');
+      detailElement.appendChild(imgLoaderSpinner);
+
+      // load full size image in background
+      loadImage(src, () => {
+        // after the singelton loadImage has loaded the detail image into the
+        // cache, it can be used in the origin <img> as src property.
+        img.src = src;
+        img.removeAttribute('data-src');
+      });
+    };
+
+    searxng.closeDetail = function () {
+      d.getElementById('results').classList.remove('image-detail-open');
+      // remove #image-viewer hash from url by navigating back
+      if (window.location.hash == '#image-viewer') window.history.back();
+      searxng.scrollPageToSelected();
+    };
+    searxng.on('.result-detail-close', 'click', e => {
+      e.preventDefault();
+      searxng.closeDetail();
+    });
+    searxng.on('.result-detail-previous', 'click', e => {
+      e.preventDefault();
+      searxng.selectPrevious(false);
+    });
+    searxng.on('.result-detail-next', 'click', e => {
+      e.preventDefault();
+      searxng.selectNext(false);
+    });
+
+    // listen for the back button to be pressed and dismiss the image details when called
+    window.addEventListener('hashchange', () => {
+      if (window.location.hash != '#image-viewer') searxng.closeDetail();
+    });
+
+    d.querySelectorAll('.swipe-horizontal').forEach(
+      obj => {
+        obj.addEventListener('swiped-left', function () {
+          searxng.selectNext(false);
+        });
+        obj.addEventListener('swiped-right', function () {
+          searxng.selectPrevious(false);
+        });
+      }
+    );
+
+    w.addEventListener('scroll', function () {
+      var e = d.getElementById('backToTop'),
+        scrollTop = document.documentElement.scrollTop || document.body.scrollTop,
+        results = d.getElementById('results');
+      if (e !== null) {
+        if (scrollTop >= 100) {
+          results.classList.add('scrolling');
+        } else {
+          results.classList.remove('scrolling');
+        }
+      }
+    }, true);
+
+  });
+
+})(window, document, window.searxng);
diff --git a/client/simple/src/js/main/search.js b/client/simple/src/js/main/search.js
new file mode 100644
index 000000000..aca146c41
--- /dev/null
+++ b/client/simple/src/js/main/search.js
@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
+/* exported AutoComplete */
+
+import AutoComplete from  "../../../node_modules/autocomplete-js/dist/autocomplete.js";
+
+(function (w, d, searxng) {
+  'use strict';
+
+  var qinput_id = "q", qinput;
+
+  const isMobile = window.matchMedia("only screen and (max-width: 50em)").matches;
+
+  function submitIfQuery () {
+    if (qinput.value.length  > 0) {
+      var search = document.getElementById('search');
+      setTimeout(search.submit.bind(search), 0);
+    }
+  }
+
+  function createClearButton (qinput) {
+    var cs = document.getElementById('clear_search');
+    var updateClearButton = function () {
+      if (qinput.value.length === 0) {
+        cs.classList.add("empty");
+      } else {
+        cs.classList.remove("empty");
+      }
+    };
+
+    // update status, event listener
+    updateClearButton();
+    cs.addEventListener('click', function (ev) {
+      qinput.value = '';
+      qinput.focus();
+      updateClearButton();
+      ev.preventDefault();
+    });
+    qinput.addEventListener('input', updateClearButton, false);
+  }
+
+  searxng.ready(function () {
+    qinput = d.getElementById(qinput_id);
+
+    if (qinput !== null) {
+      // clear button
+      createClearButton(qinput);
+
+      // autocompleter
+      if (searxng.settings.autocomplete) {
+        searxng.autocomplete = AutoComplete.call(w, {
+          Url: "./autocompleter",
+          EmptyMessage: searxng.settings.translations.no_item_found,
+          HttpMethod: searxng.settings.method,
+          HttpHeaders: {
+            "Content-type": "application/x-www-form-urlencoded",
+            "X-Requested-With": "XMLHttpRequest"
+          },
+          MinChars: searxng.settings.autocomplete_min,
+          Delay: 300,
+          _Position: function () {},
+          _Open: function () {
+            var params = this;
+            Array.prototype.forEach.call(this.DOMResults.getElementsByTagName("li"), function (li) {
+              if (li.getAttribute("class") != "locked") {
+                li.onmousedown = function () {
+                  params._Select(li);
+                };
+              }
+            });
+          },
+          _Select: function (item) {
+            AutoComplete.defaults._Select.call(this, item);
+            var form = item.closest('form');
+            if (form) {
+              form.submit();
+            }
+          },
+          _MinChars: function () {
+            if (this.Input.value.indexOf('!') > -1) {
+              return 0;
+            } else {
+              return AutoComplete.defaults._MinChars.call(this);
+            }
+          },
+          KeyboardMappings: Object.assign({}, AutoComplete.defaults.KeyboardMappings, {
+            "KeyUpAndDown_up": Object.assign({}, AutoComplete.defaults.KeyboardMappings.KeyUpAndDown_up, {
+              Callback: function (event) {
+                AutoComplete.defaults.KeyboardMappings.KeyUpAndDown_up.Callback.call(this, event);
+                var liActive = this.DOMResults.querySelector("li.active");
+                if (liActive) {
+                  AutoComplete.defaults._Select.call(this, liActive);
+                }
+              },
+            }),
+            "Tab": Object.assign({}, AutoComplete.defaults.KeyboardMappings.Enter, {
+              Conditions: [{
+                Is: 9,
+                Not: false
+              }],
+              Callback: function (event) {
+                if (this.DOMResults.getAttribute("class").indexOf("open") != -1) {
+                  var liActive = this.DOMResults.querySelector("li.active");
+                  if (liActive !== null) {
+                    AutoComplete.defaults._Select.call(this, liActive);
+                    event.preventDefault();
+                  }
+                }
+              },
+            })
+          }),
+        }, "#" + qinput_id);
+      }
+
+      /*
+        Monkey patch autocomplete.js to fix a bug
+        With the POST method, the values are not URL encoded: query like "1 + 1" are sent as "1  1" since space are URL encoded as plus.
+        See HTML specifications:
+        * HTML5: https://url.spec.whatwg.org/#concept-urlencoded-serializer
+        * HTML4: https://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.1
+
+        autocomplete.js does not URL encode the name and values:
+        https://github.com/autocompletejs/autocomplete.js/blob/87069524f3b95e68f1b54d8976868e0eac1b2c83/src/autocomplete.ts#L665
+
+        The monkey patch overrides the compiled version of the ajax function.
+        See https://github.com/autocompletejs/autocomplete.js/blob/87069524f3b95e68f1b54d8976868e0eac1b2c83/dist/autocomplete.js#L143-L158
+        The patch changes only the line 156 from
+          params.Request.send(params._QueryArg() + "=" + params._Pre());
+        to
+          params.Request.send(encodeURIComponent(params._QueryArg()) + "=" + encodeURIComponent(params._Pre()));
+
+        Related to:
+        * https://github.com/autocompletejs/autocomplete.js/issues/78
+        * https://github.com/searxng/searxng/issues/1695
+       */
+      AutoComplete.prototype.ajax = function (params, request, timeout) {
+        if (timeout === void 0) { timeout = true; }
+        if (params.$AjaxTimer) {
+          window.clearTimeout(params.$AjaxTimer);
+        }
+        if (timeout === true) {
+          params.$AjaxTimer = window.setTimeout(AutoComplete.prototype.ajax.bind(null, params, request, false), params.Delay);
+        } else {
+          if (params.Request) {
+            params.Request.abort();
+          }
+          params.Request = request;
+          params.Request.send(encodeURIComponent(params._QueryArg()) + "=" + encodeURIComponent(params._Pre()));
+        }
+      };
+
+      if (!isMobile && document.querySelector('.index_endpoint')) {
+        qinput.focus();
+      }
+    }
+
+    // Additionally to searching when selecting a new category, we also
+    // automatically start a new search request when the user changes a search
+    // filter (safesearch, time range or language) (this requires JavaScript
+    // though)
+    if (
+      qinput !== null
+        && searxng.settings.search_on_category_select
+      // If .search_filters is undefined (invisible) we are on the homepage and
+      // hence don't have to set any listeners
+        && d.querySelector(".search_filters") != null
+    ) {
+      searxng.on(d.getElementById('safesearch'), 'change', submitIfQuery);
+      searxng.on(d.getElementById('time_range'), 'change', submitIfQuery);
+      searxng.on(d.getElementById('language'), 'change', submitIfQuery);
+    }
+
+    const categoryButtons = d.querySelectorAll("button.category_button");
+    for (let button of categoryButtons) {
+      searxng.on(button, 'click', (event) => {
+        if (event.shiftKey) {
+          event.preventDefault();
+          button.classList.toggle("selected");
+          return;
+        }
+
+        // manually deselect the old selection when a new category is selected
+        const selectedCategories = d.querySelectorAll("button.category_button.selected");
+        for (let categoryButton of selectedCategories) {
+          categoryButton.classList.remove("selected");
+        }
+        button.classList.add("selected");
+      })
+    }
+
+    // override form submit action to update the actually selected categories
+    const form = d.querySelector("#search");
+    if (form != null) {
+      searxng.on(form, 'submit', (event) => {
+        event.preventDefault();
+        const categoryValuesInput = d.querySelector("#selected-categories");
+        if (categoryValuesInput) {
+          let categoryValues = [];
+          for (let categoryButton of categoryButtons) {
+            if (categoryButton.classList.contains("selected")) {
+              categoryValues.push(categoryButton.name.replace("category_", ""));
+            }
+          }
+          categoryValuesInput.value = categoryValues.join(",");
+        }
+        form.submit();
+      });
+    }
+  });
+
+})(window, document, window.searxng);