ethanyoo.com/themes/geronimo/static/js/fixedsearch.js

242 lines
9.1 KiB
JavaScript
Raw Normal View History

// static/scripts/fixedsearch/fixedsearch.js
/*--------------------------------------------------------------
fixedsearch Super fast, client side search for Hugo.io with Fusejs.io
based on https://gist.github.com/cmod/5410eae147e4318164258742dd053993
--------------------------------------------------------------*/
if (typeof variable !== 'undefined') {
console.log('fixedsearch.js already loaded');
} else {
fixedsearch = function(){
var search_form = document.getElementById('search-form'); // search form
var search_input = document.getElementById('search-input'); // input box for search
var search_submit = document.getElementById('search-submit'); // form submit button
var search_results = document.getElementById('search-results'); // targets the <ul>
var fuse; // holds our search engine
var search__focus = false; // check to true to make visible by default
var results_available = false; // did we get any search results?
var first_run = true; // allow us to delay loading json data unless search activated
var first = search_results.firstChild; // first child of search list
var last = search_results.lastChild; // last child of search list
search_form.classList.remove('noscript'); // JavaScript is active
search_form.setAttribute('data-focus', search__focus);
/*--------------------------------------------------------------
The main keyboard event listener running the show
--------------------------------------------------------------*/
document.addEventListener('keydown', function(e) {
// console.log(event); // DEBUG
// Ctrl + / to show or hide Search
// if (event.metaKey && event.which === 191) {
if (event.ctrlKey && event.which === 191) {
search_toggle_focus(e); // toggle visibility of search box
}
});
/*--------------------------------------------------------------
The main keyboard event listener running the show
--------------------------------------------------------------*/
search_form.addEventListener('keydown', function(e) {
// Allow ESC (27) to close search box
if (e.keyCode == 27) {
search__focus = true; // make sure toggle removes focus
search_toggle_focus(e);
}
// DOWN (40) arrow
if (e.keyCode == 40) {
if (results_available) {
e.preventDefault(); // stop window from scrolling
if ( document.activeElement == search_input) { first.focus(); } // if the currently focused element is the main input --> focus the first <li>
else if ( document.activeElement == last ) { first.focus(); } // if we're at the bottom, loop to the start
// else if ( document.activeElement == last ) { last.focus(); } // if we're at the bottom, stay there
else { document.activeElement.parentElement.nextSibling.firstElementChild.focus(); } // otherwise select the next search result
}
}
// UP (38) arrow
if (e.keyCode == 38) {
if (results_available) {
e.preventDefault(); // stop window from scrolling
if ( document.activeElement == search_input) { search_input.focus(); } // If we're in the input box, do nothing
else if ( document.activeElement == first) { search_input.focus(); } // If we're at the first item, go to input box
else { document.activeElement.parentElement.previousSibling.firstElementChild.focus(); } // Otherwise, select the search result above the current active one
}
}
// Use Enter (13) to move to the first result
if (e.keyCode == 13) {
if (results_available && document.activeElement == search_input) {
e.preventDefault(); // stop form from being submitted
first.focus();
}
}
// Use Backspace (8) to switch back to the search input
if (e.keyCode == 8) {
if (document.activeElement != search_input) {
e.preventDefault(); // stop browser from going back in history
search_input.focus();
}
}
});
/*--------------------------------------------------------------
Load our json data and builds fuse.js search index
--------------------------------------------------------------*/
search_form.addEventListener('focusin', function(e) {
search_init(); // try to load the search index
});
/*--------------------------------------------------------------
Make submit button toggle focus
--------------------------------------------------------------*/
search_form.addEventListener('submit', function(e) {
search_toggle_focus(e);
e.preventDefault();
return false;
});
/*--------------------------------------------------------------
Remove focus on blur
--------------------------------------------------------------*/
search_form.addEventListener('focusout', function(e) {
if (e.relatedTarget === null) {
search_toggle_focus(e);
}
else if (e.relatedTarget.type === 'submit') {
e.stopPropagation();
}
});
/*--------------------------------------------------------------
Toggle focus UI of form
--------------------------------------------------------------*/
function search_toggle_focus(e) {
// console.log(e); // DEBUG
// order of operations is very important to keep focus where it should stay
if (!search__focus) {
search_submit.value = '';
search_form.setAttribute('data-focus', true);
search_input.focus(); // move focus to search box
search__focus = true;
}
else {
search_submit.value = '⌕';
search_form.setAttribute('data-focus', false);
document.activeElement.blur(); // remove focus from search box
search__focus = false;
}
}
/*--------------------------------------------------------------
Fetch some json without jquery
--------------------------------------------------------------*/
function fetch_JSON(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 script
based on https://stackoverflow.com/a/55451823
--------------------------------------------------------------*/
function load_script(url) {
return new Promise(function(resolve, reject) {
let script = document.createElement("script");
script.onerror = reject;
script.onload = resolve;
if (document.currentScript) {
document.currentScript.parentNode.insertBefore(script, document.currentScript);
}
else {
document.head.appendChild(script)
}
script.src = url;
});
}
/*--------------------------------------------------------------
Load our search index, only executed once
on first call of search box (Ctrl + /)
--------------------------------------------------------------*/
function search_init() {
if (first_run) {
load_script(window.location.origin + '/scripts/fixedsearch/fuse.js').then(() => {
search_input.value = ""; // reset default value
first_run = false; // let's never do this again
fetch_JSON(search_form.getAttribute('data-language-prefix') + '/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',
'date',
'summary',
'section',
'categories',
'tags'
]
};
fuse = new Fuse(data, options); // build the index from the json file
search_input.addEventListener('keyup', function(e) { // execute search as each character is typed
search_exec(this.value);
});
// console.log("index.json loaded"); // DEBUG
});
}).catch((error) => { console.log('fixedsearch failed to load: ' + error); });
}
}
/*--------------------------------------------------------------
Using the index we loaded on Ctrl + /, run
a search query (for "term") every time a letter is typed
in the search box
--------------------------------------------------------------*/
function search_exec(term) {
let results = fuse.search(term); // the actual query being run using fuse.js
let search_items = ''; // our results bucket
if (results.length === 0) { // no results based on what was typed into the input box
results_available = false;
search_items = '';
} else { // build our html
for (let item in results.slice(0,5)) { // only show first 5 results
search_items = search_items +
`<li><a href="${results[item].item.permalink}" tabindex="0">
<span class="title">${results[item].item.title}</span>
<span class="date">${results[item].item.date}</span>
<span class="summary">${results[item].item.summary}</span>
<span class="section">${results[item].item.section}</span>
<span class="categories">${results[item].item.categories.join(', ')}</span>
<span class="tags">${results[item].item.tags.join(', ')}</span>
</a></li>`;
}
results_available = true;
}
search_results.innerHTML = search_items;
if (results.length > 0) {
first = search_results.firstChild.firstElementChild; // first result container — used for checking against keyboard up/down location
last = search_results.lastChild.firstElementChild; // last result container — used for checking against keyboard up/down location
}
}
}();
}