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var fuse; // holds our search engine
var fuseIndex;
var searchVisible = false;
var firstRun = true; // allow us to delay loading json data unless search activated
var list = document.getElementById('searchResults'); // targets the <ul>
var first = list.firstChild; // first child of search list
var last = list.lastChild; // last child of search list
var maininput = document.getElementById('searchInput'); // input box for search
var resultsAvailable = false; // Did we get any search results?
// ==========================================
// execute search as each character is typed
//
document.getElementById("searchInput").onfocus = function (e) {
if (firstRun) {
loadSearch()
firstRun = false
}
}
document.getElementById("searchInput").onkeyup = function (e) {
if (firstRun) {
loadSearch()
firstRun = false
}
executeSearch(this.value);
}
// ==========================================
// fetch some json without jquery
//
function fetchJSONFile(path, callback) {
var httpRequest = new XMLHttpRequest();
httpRequest.onreadystatechange = function () {
if (httpRequest.readyState === 4) {
if (httpRequest.status === 200) {
var data = JSON.parse(httpRequest.responseText);
if (callback) callback(data);
}
}
};
httpRequest.open('GET', path);
httpRequest.send();
}
// ==========================================
// load our search index, only executed once
// on first call of search box (CMD-/)
//
function loadSearch() {
console.log('loadSearch()')
fetchJSONFile('/index.json', function (data) {
var options = { // fuse.js options; check fuse.js website for details
shouldSort: true,
location: 0,
distance: 100,
threshold: 0.4,
minMatchCharLength: 2,
keys: [
'permalink',
'title',
'tags',
'contents'
]
};
// Create the Fuse index
fuseIndex = Fuse.createIndex(options.keys, data)
fuse = new Fuse(data, options, fuseIndex); // build the index from the json file
});
}
// ==========================================
// using the index we loaded on CMD-/, run
// a search query (for "term") every time a letter is typed
// in the search box
//
function executeSearch(term) {
let results = fuse.search(term); // the actual query being run using fuse.js
let searchitems = ''; // our results bucket
if (results.length === 0) { // no results based on what was typed into the input box
resultsAvailable = false;
searchitems = '';
} else { // build our html
// console.log(results)
permalinks = [];
numLimit = 5;
for (let item in results) { // only show first 5 results
if (item > numLimit) {
break;
}
if (permalinks.includes(results[item].item.permalink)) {
continue;
}
// console.log('item: %d, title: %s', item, results[item].item.title)
searchitems = searchitems + '<li><a href="' + results[item].item.permalink + '" tabindex="0">' + '<span class="title">' + results[item].item.title + '</span></a></li>';
permalinks.push(results[item].item.permalink);
}
resultsAvailable = true;
}
document.getElementById("searchResults").innerHTML = searchitems;
if (results.length > 0) {
first = list.firstChild.firstElementChild; // first result container — used for checking against keyboard up/down location
last = list.lastChild.firstElementChild; // last result container — used for checking against keyboard up/down location
}
}
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