422 lines
10 KiB
JavaScript
422 lines
10 KiB
JavaScript
// On localhost the root url is /MATH201
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// On sasserisop the root url is /sasserisop
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const localhost = true;
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loadIndex()
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// Highlight with jQuery
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// from: https://stackoverflow.com/questions/41533785/how-to-highlight-search-text-in-html-with-the-help-of-js
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// @todo: This is the only use of jQuery. Find a vanila JS way
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jQuery.fn.highlight = function (pat) {
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function innerHighlight(node, pat) {
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var skip = 0;
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if (node.nodeType == 3) {
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var pos = node.data.toUpperCase().indexOf(pat);
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if (pos >= 0) {
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var spannode = document.createElement('span');
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spannode.className = 'highlighted';
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var middlebit = node.splitText(pos);
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var endbit = middlebit.splitText(pat.length);
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var middleclone = middlebit.cloneNode(true);
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spannode.appendChild(middleclone);
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middlebit.parentNode.replaceChild(spannode, middlebit);
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skip = 1;
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}
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} else if (node.nodeType == 1 && node.childNodes && !/(script|style) /i.test(node.tagName)) {
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for (var i = 0; i < node.childNodes.length; ++i) {
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i += innerHighlight(node.childNodes[i], pat);
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}
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}
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return skip;
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}
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return this.each(function () {
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innerHighlight(this, pat.toUpperCase());
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});
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};
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jQuery.fn.removeHighlight = function () {
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function newNormalize(node) {
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for (var i = 0, children = node.childNodes, nodeCount = children.length; i < nodeCount; i++) {
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var child = children[i];
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if (child.nodeType == 1) {
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newNormalize(child);
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continue;
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}
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if (child.nodeType != 3) { continue; }
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var next = child.nextSibling;
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if (next == null || next.nodeType != 3) { continue; }
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var combined_text = child.nodeValue + next.nodeValue;
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new_node = node.ownerDocument.createTextNode(combined_text);
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node.insertBefore(new_node, child);
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node.removeChild(child);
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node.removeChild(next);
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i--;
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nodeCount--;
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}
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}
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return this.find("span.highlighted").each(function () {
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var thisParent = this.parentNode;
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thisParent.replaceChild(this.firstChild, this);
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newNormalize(thisParent);
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}).end();
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};
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$(function () {
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$('#search-input').bind('keyup change', function (ev) {
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// pull in the new value
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var searchTerm = $(this).val();
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// remove any old highlighted terms
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$('body').removeHighlight();
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// disable highlighting if empty
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if (searchTerm) {
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// highlight the new term
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$('body').highlight(searchTerm);
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}
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});
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});
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///
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var scrollTop = 0
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document.addEventListener("turbolinks:before-render", function () {
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var search_index = document.getElementById("search-results");
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var y = search_index.scrollTop;
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scrollTop = y
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})
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document.addEventListener("turbolinks:render", function () {
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var search_index = document.getElementById("search-results");
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search_index.scrollTop = scrollTop
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})
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document.addEventListener("turbolinks:load", function () {
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setNoteWrapperState()
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const current = window.location.href
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var els = document.getElementsByTagName("a");
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for (var i = 0, l = els.length; i < l; i++) {
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var el = els[i];
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if (el.href === current) {
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el.classList.add("selected")
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} else {
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el.classList.remove("selected")
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}
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}
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})
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function loadIndex() {
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const root = localhost ? "" : "/MATH201";
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fetchJSON(function (response) {
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const notes = response;
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const search_results = document.getElementById('search-results');
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const tags = document.getElementById('tags');
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const current_note = window.location.href;
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// sorted notes by lecture number
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const lecture_notes = new Map();
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const non_lecture_notes = [];
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// Fixed a bug where the search results had unwanted notes.
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// The notes are now filtered first.
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notes.index.filter(n => !/^Drawing|^20/.test(n.title)).forEach(note => {
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const title = '<h4>' + note.title + '</h4>';
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const summary = '<div>' + note.summary + '</div>';
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const permalink = note.permalink
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var thumbnail = ""
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if (note.thumbnail === "") {
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thumbnail = ""
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} else {
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// @todo:
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// this loads the first image of the note
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// for every note in the vault
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// this isn't efficient at all
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// 2 ideas:
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// find a way of resizing with hugo
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// use lazy loading.
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thumbnail = '<img loading="lazy" src="' + note.thumbnail + '?nf_resize=fit&w=122&h=76"/><span style="display:none";>@attachments</span>'
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}
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const tags = '<span style="display:none">' + note.tags + '</span>'
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var list_content;
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if (current_note === permalink) {
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list_content = '<a href="' + root + permalink + '" class="selected search-item" tabindex="0">' + title + summary + '</a>'
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} else {
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list_content = '<a href="' + root + permalink + '" class="search-item" tabindex="0">' + title + summary + thumbnail + tags + '</a>'
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}
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const child = document.createElement("li");
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child.innerHTML = list_content;
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// Add lecture notes to a dictionary, and then sort them by lecture number.
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// second last character of the title may be first digit of lecture number
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const d1 = note.title[note.title.length - 2];
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// find the lecture number, if there is one
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if (/\d/.test(d1)) {
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// it has a lecture number
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// if the third last character is a digit, then the lecture number is 2 digits
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const d2 = note.title[note.title.length - 3];
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const lecture_number = /\d/.test(d2) ? Number(d2 + d1) : Number(d1);
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lecture_notes.set(lecture_number, child);
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} else {
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non_lecture_notes.push(child);
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}
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});
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// sort notes by lecture number
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const sorted_notes = new Map([...lecture_notes.entries()].sort((a, b) => (a[0] - b[0])));
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// Add sorted notes first
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sorted_notes.forEach(val => {
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search_results.append(val);
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});
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non_lecture_notes.forEach(child => {
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search_results.append(child);
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})
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// @todo: wip
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// notes.tags.forEach(tag => {
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// const child = document.createElement("li");
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// child.innerHTML = '<a onclick="focusTag(this)">' + tag + '</a>'
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// tags.append(child)
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// });
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//
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}, root);
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}
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function fetchJSON(callback, root) {
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const requestURL = root + '/index.json';
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const request = new XMLHttpRequest();
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request.open('GET', requestURL, true);
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request.responseType = 'json';
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request.onreadystatechange = function () {
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if (request.readyState === 4 && request.status === 200) {
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callback(request.response);
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}
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};
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request.send(null);
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}
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function focusTag(a) {
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showNav()
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performSearchWith(a.innerText)
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}
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function performSearchWith(query) {
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// document.getElementById('search-input').value = query
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var filter, ul, li, a, i, txtValue;
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filter = query.toLowerCase();
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filter = filter.replace('/[.*+?^${}()|[\]\\]/g', '\\$&');
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var re = new RegExp(filter, 'g');
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ul = document.getElementById("search-results");
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li = ul.getElementsByTagName('li');
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for (i = 0; i < li.length; i++) {
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a = li[i].getElementsByTagName("a")[0];
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txtValue = a.textContent || a.innerText;
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if (txtValue.toLowerCase().indexOf(filter) > -1) {
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li[i].style.display = "block";
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} else {
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li[i].style.display = "none";
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}
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}
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}
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function performSearch() {
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var input, filter, ul, li, a, i, txtValue;
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input = document.getElementById('search-input');
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filter = input.value.toLowerCase();
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filter = filter.replace('/[.*+?^${}()|[\]\\]/g', '\\$&');
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var re = new RegExp(filter, 'g');
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ul = document.getElementById("search-results");
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li = ul.getElementsByTagName('li');
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for (i = 0; i < li.length; i++) {
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a = li[i].getElementsByTagName("a")[0];
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txtValue = a.textContent || a.innerText;
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if (txtValue.toLowerCase().indexOf(filter) > -1) {
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li[i].style.display = "block";
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} else {
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li[i].style.display = "none";
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}
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}
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}
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// Keyboard shortcuts
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document.addEventListener('keydown', function (evt) {
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if (evt.metaKey && evt.which === 75 || evt.ctrlKey && evt.which === 75) {
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document.getElementById("search-input").focus();
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handleNavVisibility()
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}
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if (evt.key === "Escape" || evt.key === "Esc" | evt.keyCode === 27) {
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hideNav()
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}
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});
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var nav_is_visible = false;
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function handleNavVisibility() {
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$("#search").toggle("slide");
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}
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function showNav() {
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document.getElementById("search").style.width = "300px";
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document.getElementById("search").style.opacity = 1;
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document.getElementById("search-header").style.opacity = 1;
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document.getElementById("search-header").style.width = "299px";
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pushNoteWrapper()
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nav_is_visible = true;
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}
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function hideNav() {
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document.getElementById("search").style.width = "0";
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document.getElementById("search-header").style.width = "0";
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document.getElementById("search").style.opacity = 0;
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document.getElementById("search-header").style.opacity = 0;
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document.getElementById("main").style.marginLeft = "0";
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pullNoteWrapper()
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nav_is_visible = false;
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}
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function setNoteWrapperState() {
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if (nav_is_visible) {
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pushNoteWrapper()
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} else {
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pullNoteWrapper()
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}
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}
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function pushNoteWrapper() {
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document.getElementById("main").style.marginLeft = "300px";
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}
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function pullNoteWrapper() {
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document.getElementById("main").style.marginLeft = "0";
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}
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// Prefetching
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// https://github.com/turbolinks/turbolinks/issues/313
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const hoverTime = 300
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const fetchers = {}
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const doc = document.implementation.createHTMLDocument('prefetch')
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function fetchPage(url, success) {
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const xhr = new XMLHttpRequest()
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xhr.open('GET', url)
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xhr.setRequestHeader('VND.PREFETCH', 'true')
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xhr.setRequestHeader('Accept', 'text/html')
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xhr.onreadystatechange = () => {
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if (xhr.readyState !== XMLHttpRequest.DONE) return
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if (xhr.status !== 200) return
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success(xhr.responseText)
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}
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xhr.send()
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}
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function prefetchTurbolink(url) {
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fetchPage(url, responseText => {
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doc.open()
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doc.write(responseText)
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doc.close()
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const snapshot = Turbolinks.Snapshot.fromHTMLElement(doc.documentElement)
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Turbolinks.controller.cache.put(url, snapshot)
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})
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}
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function prefetch(url) {
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if (prefetched(url)) return
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prefetchTurbolink(url)
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}
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function prefetched(url) {
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return location.href === url || Turbolinks.controller.cache.has(url)
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}
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function prefetching(url) {
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return !!fetchers[url]
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}
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function cleanup(event) {
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const element = event.target
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clearTimeout(fetchers[element.href])
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element.removeEventListener('mouseleave', cleanup)
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}
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document.addEventListener('mouseover', event => {
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if (!event.target.dataset.prefetch) return
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const url = event.target.href
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if (prefetched(url)) return
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if (prefetching(url)) return
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cleanup(event)
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event.target.addEventListener('mouseleave', cleanup)
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fetchers[url] = setTimeout(() => prefetch(url), hoverTime)
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})
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