@@ -1,7 +1,4 @@
1−//
2− // toggling of navigation menus
3−//
4−
1+// toggling of navigation menus
52var toggleMainNav = document.getElementById('js-main-nav-toggle');
63if (toggleMainNav !== null) {
74 toggleMainNav.onclick = function() {
@@ -16,34 +13,311 @@ if (toggleContentNav !== null) {
1613 }
1714}
1815
19−//
20− // styling of input fields
21−//
22−
23−var inputElements = document.querySelectorAll('input.tlon-input');
24−for (var i = 0; i < inputElements.length; i++) {
25− //listen for changes in input
26− inputElements[i].addEventListener('input', function() {
27− // if input has a value do this
28− if (this.value) {
29− var inputContainer = this.parentNode;
30− var validInputs = inputContainer.querySelectorAll('input.tlon-input:valid');
31− var inputs = inputContainer.querySelectorAll('input.tlon-input');
32− if (validInputs.length !== 0) {
33− // has valid input
34− for (var i = 0; i < validInputs.length; i++) {
35− if (this.classList.contains('is-valid') == false ) {
36− validInputs[i].parentNode.classList.add('has-valid-input');
37− }
16+function initHotKeys() {
17+
18+ var bodyEl = document.body;
19+ var searchInput = document.getElementById('search');
20+
21+ document.addEventListener('keydown', function (event) {
22+ if (event.defaultPrevented) {
23+ return;
24+ }
25+
26+ var key = event.key || event.keyCode;
27+
28+ // ESC to close search window
29+ if (key === 'Escape' || key === 'Esc' || key === 27) {
30+ document.body.classList.remove('has-active-search-window');
31+ console.log('esc');
32+ }
33+
34+ // / to close toggle window
35+ if (key === '/' || key === 'Period' || key === 58) {
36+ event.preventDefault();
37+ document.body.classList.toggle('has-active-search-window');
38+ if (bodyEl.classList.contains('has-active-search-window')) {
39+ searchInput.focus();
40+ }
41+ }
42+
43+ //when search is active TAB puts search input into focus
44+ if (bodyEl.classList.contains('has-active-search-window')) {
45+ if (key === 'Tab' || key === 'Tab' || key === 9) {
46+ searchInput.focus();
3847 }
39− } else {
40− // doesn't have valid input
41− for (var i = 0; i < inputs.length; i++) {
42− inputs[i].parentNode.classList.remove('has-valid-input');
48+ }
49+ });
50+};
51+
52+
53+// search functionality
54+function debounce(func, wait) {
55+ var timeout;
56+
57+ return function () {
58+ var context = this;
59+ var args = arguments;
60+ clearTimeout(timeout);
61+
62+ timeout = setTimeout(function () {
63+ timeout = null;
64+ func.apply(context, args);
65+ }, wait);
66+ };
67+}
68+
69+// The strategy is as follows:
70+// First, assign a value to each word in the document:
71+// Words that correspond to search terms (stemmer aware): 40
72+// Normal words: 2
73+// First word in a sentence: 8
74+// Then use a sliding window with a constant number of words and count the
75+// sum of the values of the words within the window. Then use the window that got the
76+// maximum sum. If there are multiple maximas, then get the last one.
77+// Enclose the terms in <b>.
78+function makeTeaser(body, terms) {
79+ var TERM_WEIGHT = 40;
80+ var NORMAL_WORD_WEIGHT = 2;
81+ var FIRST_WORD_WEIGHT = 8;
82+ //var TEASER_MAX_WORDS = 17;
83+ var TEASER_MAX_CHARS = 63;
84+
85+ var stemmedTerms = terms.map(function (w) {
86+ return elasticlunr.stemmer(w.toLowerCase());
87+ });
88+
89+ var termFound = false;
90+ var index = 0;
91+ var weighted = []; // contains elements of ["word", weight, index_in_document]
92+
93+ // split in sentences, then words
94+ var sentences = body.toLowerCase().split(". ");
95+
96+ for (var i in sentences) {
97+ var words = sentences[i].split(" ");
98+ var value = FIRST_WORD_WEIGHT;
99+
100+ for (var j in words) {
101+ var word = words[j];
102+
103+ if (word.length > 0) {
104+ for (var k in stemmedTerms) {
105+ if (elasticlunr.stemmer(word).startsWith(stemmedTerms[k])) {
106+ value = TERM_WEIGHT;
107+ termFound = true;
108+ }
43109 }
110+ weighted.push([word, value, index]);
111+ value = NORMAL_WORD_WEIGHT;
112+ }
113+
114+ index += word.length;
115+ index += 1; // ' ' or '.' if last word in sentence
116+ }
117+
118+ index += 1; // because we split at a two-char boundary '. '
119+ }
120+
121+ if (weighted.length === 0) {
122+ return body;
123+ }
124+
125+ var windowWeights = [];
126+ var windowSize = 0;
127+
128+ // loop over words (weighted) till max chars is reached adding a counter to windowSize every time a new word has passed
129+ var sumChars = 0;
130+ for (var i = 0; i < weighted.length; i++) {
131+ sumChars += weighted[i][0].length;
132+ if (sumChars <= TEASER_MAX_CHARS) {
133+ windowSize++;
134+ }
135+ }
136+
137+ // We add a window with all the weights first
138+ var curSum = 0;
139+ for (var i = 0; i < windowSize; i++) {
140+ curSum += weighted[i][1];
141+ }
142+ windowWeights.push(curSum);
143+
144+ for (var i = 0; i < weighted.length - windowSize; i++) {
145+ curSum -= weighted[i][1];
146+ curSum += weighted[i + windowSize][1];
147+ windowWeights.push(curSum);
148+ }
149+
150+ // If we didn't find the term, just pick the first window
151+ var maxSumIndex = 0;
152+ if (termFound) {
153+ var maxFound = 0;
154+ // backwards
155+ for (var i = windowWeights.length - 1; i >= 0; i--) {
156+ if (windowWeights[i] > maxFound) {
157+ maxFound = windowWeights[i];
158+ maxSumIndex = i;
44159 }
45− } else {
46− this.parentNode.classList.remove('has-valid-input');
47160 }
161+ }
162+
163+ var teaser = [];
164+ var startIndex = weighted[maxSumIndex][2];
165+ for (var i = maxSumIndex; i < maxSumIndex + windowSize; i++) {
166+ var word = weighted[i];
167+ if (startIndex < word[2]) {
168+ // missing text from index to start of `word`
169+ teaser.push(body.substring(startIndex, word[2]));
170+ startIndex = word[2];
171+ }
172+
173+ startIndex = word[2] + word[0].length;
174+ teaser.push(body.substring(word[2], startIndex));
175+
176+ }
177+ teaser.push("…");
178+ return teaser.join("");
179+}
180+
181+function formatSearchResultTitle(item) {
182+ var pathArray = item.ref.split( '/' );
183+
184+ // first directory is in 4th element of split path array
185+ var firstPartTitle = pathArray[3];
186+
187+ // last directory is in 2nd to last element of array
188+ var lastPartTitle = item.doc.title;
189+
190+ var fullTitle = firstPartTitle + '<span class="gray90 inline-block pl2">' + ' / ' + lastPartTitle + '</span>';
191+
192+ return fullTitle;
193+}
194+
195+function formatSearchResultItem(item, terms) {
196+ console.log(item);
197+ var li = document.createElement("li");
198+ var createA = document.createElement("a");
199+ li.appendChild(createA);
200+ var teaserTitle = formatSearchResultTitle(item);
201+ li.classList.add("search-results__item");
202+ li.classList.add("ph3");
203+ var hrefA = item.ref;
204+ createA.setAttribute('href', hrefA);
205+ createA.setAttribute('class','no-underline block pl6 pv3');
206+ createA.innerHTML = `<span class="fs45 capitalize">${teaserTitle}</span>`;
207+ createA.innerHTML += `<span class='pr7 fs5 none float-right'>→</span>`;
208+ createA.innerHTML += `<div class="fs35 truncate mr10">${makeTeaser(item.doc.body, terms)}</div>`;
209+ return li;
210+}
211+
212+function initSearch() {
213+ var searchInput = document.getElementById("search");
214+ var searchForm = document.getElementById("search-form");
215+ var inputReset = searchForm.nextElementSibling;
216+
217+ if (!searchInput) {
218+ return;
219+ }
220+
221+ var searchResults = document.querySelector(".search-results");
222+ var searchResultsHeader = document.querySelector(".search-results__header");
223+ var searchResultsItems = document.querySelector(".search-results__items");
224+ var MAX_ITEMS = 200;
225+ var options = {
226+ bool: "AND",
227+ expand: true, // turn on partial word search
228+ fields: {
229+ title: {boost: 2},
230+ body: {boost: 1},
231+ }
232+ };
233+ var currentTerm = "";
234+ var index = elasticlunr.Index.load(window.searchIndex);
235+ // toggle search window
236+ var toggleSearchWindow = document.getElementById('js-search-window-toggle');
237+ var bodyEl = document.body;
238+ var searchOverlay = document.getElementById('search-overlay');
239+ var searchWindow = document.getElementById('search-window');
240+ var searchActive = bodyEl.classList.contains('has-active-search-window');
241+
242+ if (toggleSearchWindow !== null) {
243+ toggleSearchWindow.onclick = function() {
244+ inputReset.style.display="none";
245+
246+ //activate search
247+ bodyEl.classList.toggle('has-active-search-window');
248+ //put input in focus when activating search
249+ searchInput.focus();
250+
251+ searchInput.value = "";
252+ searchResultsHeader.value = "";
253+ searchResults.style.display = searchInput.value.trim() === "" ? "none" : "block";
254+ }
255+ searchOverlay.addEventListener('click', function(e){
256+ if (!searchWindow.contains(e.target)){
257+ bodyEl.classList.toggle('has-active-search-window');
258+ }
259+ })
260+ }
261+
262+
263+ searchInput.addEventListener("keyup", debounce(function() {
264+ inputReset.style.display="block";
265+
266+ searchResultsHeader.value = "";
267+ var term = searchInput.value.trim();
268+ /*
269+ //removed to fix: a state where there’s a valid search term, but no results
270+
271+ if (term === currentTerm || !index) {
272+ return;
273+ }*/
274+
275+ searchResults.style.display = term === "" ? "none" : "block";
276+ searchResults.style.overflowY = term === "" ? "hidden" : "scroll";
277+ searchResultsItems.innerHTML = "";
278+ if (term === "") {
279+ inputReset.style.display="none";
280+ return;
281+ }
282+
283+ var results = index.search(term, options).filter(function (r) {
284+ return r.doc.body !== "";
285+ });
286+
287+ if (results.length === 0) {
288+ searchResultsHeader.innerText = `No search results for '${term}'.`;
289+ return;
290+ }
291+
292+ currentTerm = term;
293+ searchResultsHeader.innerText = `${results.length} search results for '${term}':`;
294+ for (var i = 0; i < Math.min(results.length, MAX_ITEMS); i++) {
295+ if (!results[i].doc.body) {
296+ continue;
297+ }
298+ searchResultsItems.appendChild(formatSearchResultItem(results[i], term.split(" ")));
299+ }
300+ }, 150));
301+
302+ // reset input button
303+ inputReset.onclick=function(){
304+ document.getElementById('search-form').reset();
305+ }
306+ searchForm.addEventListener("reset", function(event){
307+ var e = document.createEvent('KeyboardEvent');
308+ e.initEvent("keyup", false, true);
309+ searchInput.dispatchEvent(e);
310+ });
311+
312+}
313+
314+if (document.readyState === "complete" ||
315+ (document.readyState !== "loading" && !document.documentElement.doScroll)
316+) {
317+ initToggleSearchWindow();
318+} else {
319+ document.addEventListener("DOMContentLoaded", function () {
320+ initSearch();
321+ initHotKeys();
48322 });
49323}