289 lines
14 KiB
JavaScript
289 lines
14 KiB
JavaScript
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/*
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JavaScript autoComplete v1.0.4+
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McShelby/hugo-theme-relearn#155
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- PR #46, PR #75: introducing selectorToInsert and anchor to it
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- sticky dropdown on scrolling
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McShelby/hugo-theme-relearn#387
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- don't empty search input if no data-val is given
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- don't delete search term but close suggestions when suggestions are open
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- delete search term when suggestions are closed
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McShelby/hugo-theme-relearn#452
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- register focus event ignoring minChars because that doesn't make sense
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McShelby/hugo-theme-relearn#452
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- on ESC, close overlay without deleting search term if overlay is open
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- on ESC, delete search term if overlay is closed
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- on UP, preventDefault to keep cursor in position
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Copyright (c) 2014 Simon Steinberger / Pixabay
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GitHub: https://github.com/Pixabay/JavaScript-autoComplete
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License: http://www.opensource.org/licenses/mit-license.php
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*/
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var autoComplete = (function(){
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// "use strict";
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function autoComplete(options){
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if (!document.querySelector) return;
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// helpers
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function hasClass(el, className){ return el.classList ? el.classList.contains(className) : new RegExp('\\b'+ className+'\\b').test(el.className); }
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function addEvent(el, type, handler){
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if (el.attachEvent) el.attachEvent('on'+type, handler); else el.addEventListener(type, handler);
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}
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function removeEvent(el, type, handler){
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// if (el.removeEventListener) not working in IE11
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if (el.detachEvent) el.detachEvent('on'+type, handler); else el.removeEventListener(type, handler);
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}
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function live(elClass, event, cb, context){
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addEvent(context || document, event, function(e){
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var found, el = e.target || e.srcElement;
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while (el && !(found = hasClass(el, elClass))) el = el.parentElement;
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if (found) cb.call(el, e);
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});
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}
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var o = {
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selector: 0,
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source: 0,
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minChars: 3,
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delay: 150,
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offsetLeft: 0,
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offsetTop: 1,
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cache: 1,
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menuClass: '',
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selectorToInsert: 0,
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renderItem: function (item, search){
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// escape special characters
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search = search.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
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var re = new RegExp("(" + search.split(' ').join('|') + ")", "gi");
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return '<div class="autocomplete-suggestion" data-val="' + item + '">' + item.replace(re, "<b>$1</b>") + '</div>';
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},
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onSelect: function(e, term, item){}
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};
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for (var k in options) { if (options.hasOwnProperty(k)) o[k] = options[k]; }
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// init
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var elems = typeof o.selector == 'object' ? [o.selector] : document.querySelectorAll(o.selector);
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for (var i=0; i<elems.length; i++) {
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var that = elems[i];
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// create suggestions container "sc"
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that.sc = document.createElement('div');
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that.sc.className = 'autocomplete-suggestions '+o.menuClass;
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that.autocompleteAttr = that.getAttribute('autocomplete');
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that.setAttribute('autocomplete', 'off');
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that.cache = {};
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that.last_val = '';
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var parentElement;
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if (typeof o.selectorToInsert === "string" && document.querySelector(o.selectorToInsert) instanceof HTMLElement) {
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parentElement = document.querySelector(o.selectorToInsert);
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}
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that.updateSC = function(resize, next){
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var rect = that.getBoundingClientRect();
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var parentOffsetLeft = 0;
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var parentOffsetTop = 0;
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var pageXOffset = 0;
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var pageYOffset = 0;
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if (parentElement != false) {
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parentOffsetLeft = parentElement.getBoundingClientRect().left;
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parentOffsetTop = parentElement.getBoundingClientRect().top;
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} else {
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pageXOffset = window.pageXOffset || document.documentElement.scrollLeft;
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pageYOffset = window.pageYOffset || document.documentElement.scrollTop;
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}
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that.sc.style.left = Math.round(rect.left + pageXOffset + o.offsetLeft - parentOffsetLeft) + 'px';
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that.sc.style.top = Math.round(rect.bottom + pageYOffset + o.offsetTop - parentOffsetTop) + 'px';
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that.sc.style.width = Math.round(rect.right - rect.left) + 'px'; // outerWidth
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if (!resize) {
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that.sc.style.display = 'block';
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if (!that.sc.maxHeight) { that.sc.maxHeight = parseInt((window.getComputedStyle ? getComputedStyle(that.sc, null) : that.sc.currentStyle).maxHeight); }
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if (!that.sc.suggestionHeight) that.sc.suggestionHeight = that.sc.querySelector('.autocomplete-suggestion').offsetHeight;
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if (that.sc.suggestionHeight)
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if (!next) that.sc.scrollTop = 0;
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else {
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var scrTop = that.sc.scrollTop, selTop = next.getBoundingClientRect().top - that.sc.getBoundingClientRect().top;
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if (selTop + that.sc.suggestionHeight - that.sc.maxHeight > 0)
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that.sc.scrollTop = selTop + that.sc.suggestionHeight + scrTop - that.sc.maxHeight;
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else if (selTop < 0)
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that.sc.scrollTop = selTop + scrTop;
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}
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}
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}
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addEvent(window, 'resize', that.updateSC);
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if (typeof o.selectorToInsert === "string" && document.querySelector(o.selectorToInsert) instanceof HTMLElement) {
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document.querySelector(o.selectorToInsert).appendChild(that.sc);
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} else {
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document.body.appendChild(that.sc);
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}
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live('autocomplete-suggestion', 'mouseleave', function(e){
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var sel = that.sc.querySelector('.autocomplete-suggestion.selected');
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if (sel) setTimeout(function(){ sel.className = sel.className.replace('selected', ''); }, 20);
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}, that.sc);
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live('autocomplete-suggestion', 'mouseover', function(e){
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var sel = that.sc.querySelector('.autocomplete-suggestion.selected');
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if (sel) sel.className = sel.className.replace('selected', '');
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this.className += ' selected';
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}, that.sc);
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live('autocomplete-suggestion', 'mousedown', function(e){
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if (hasClass(this, 'autocomplete-suggestion')) { // else outside click
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var v = this.getAttribute('data-val');
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that.value = v;
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o.onSelect(e, v, this);
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that.sc.style.display = 'none';
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}
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}, that.sc);
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that.blurHandler = function(){
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try { var over_sb = document.querySelector('.autocomplete-suggestions:hover'); } catch(e){ var over_sb = 0; }
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if (!over_sb) {
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that.last_val = that.value;
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that.sc.style.display = 'none';
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setTimeout(function(){ that.sc.style.display = 'none'; }, 350); // hide suggestions on fast input
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} else if (that !== document.activeElement) setTimeout(function(){ that.focus(); }, 20);
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};
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addEvent(that, 'blur', that.blurHandler);
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var suggest = function(data){
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var val = that.value;
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that.cache[val] = data;
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if (data.length && val.length >= o.minChars) {
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var s = '';
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for (var i=0;i<data.length;i++) s += o.renderItem(data[i], val);
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that.sc.innerHTML = s;
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that.updateSC(0);
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}
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else
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that.sc.style.display = 'none';
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}
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that.keydownHandler = function(e){
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var key = window.event ? e.keyCode : e.which;
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// down (40), up (38)
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if ((key == 40 || key == 38) && that.sc.innerHTML) {
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e.preventDefault();
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var next, sel = that.sc.querySelector('.autocomplete-suggestion.selected');
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if (!sel) {
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next = (key == 40) ? that.sc.querySelector('.autocomplete-suggestion') : that.sc.childNodes[that.sc.childNodes.length - 1]; // first : last
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next.className += ' selected';
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if (next.getAttribute('data-val')) that.value = next.getAttribute('data-val');
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} else {
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next = (key == 40) ? sel.nextSibling : sel.previousSibling;
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if (next) {
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sel.className = sel.className.replace('selected', '');
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next.className += ' selected';
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if (next.getAttribute('data-val')) that.value = next.getAttribute('data-val');
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}
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else {
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sel.className = sel.className.replace('selected', '');
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that.value = that.last_val;
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next = 0;
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}
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}
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that.updateSC(0, next);
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return false;
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}
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// esc
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else if (key == 27) {
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if (that.sc.style.display != 'none') {
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// just close the overlay if it's open, and prevent other listeners
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// from recognizing it; this is not for you!
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e.preventDefault();
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e.stopImmediatePropagation();
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that.sc.style.display = 'none';
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var sel = that.sc.querySelector('.autocomplete-suggestion.selected');
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if (sel) {
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that.focus();
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}
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}
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else {
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// if no overlay is open, we want to remove the search term and also
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// want other listeners to recognize it
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that.value = '';
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}
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}
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// enter
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else if (key == 13 || key == 9) {
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var sel = that.sc.querySelector('.autocomplete-suggestion.selected');
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if (sel && that.sc.style.display != 'none') { o.onSelect(e, sel.getAttribute('data-val'), sel); setTimeout(function(){ that.sc.style.display = 'none'; }, 20); }
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}
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};
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addEvent(that, 'keydown', that.keydownHandler);
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that.keyupHandler = function(e){
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var key = window.event ? e.keyCode : e.which;
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if (!key || (key < 35 || key > 40) && key != 13 && key != 27) {
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var val = that.value;
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if (val.length >= o.minChars) {
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if (val != that.last_val) {
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that.last_val = val;
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clearTimeout(that.timer);
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if (o.cache) {
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if (val in that.cache) { suggest(that.cache[val]); return; }
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// no requests if previous suggestions were empty
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for (var i=1; i<val.length-o.minChars; i++) {
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var part = val.slice(0, val.length-i);
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if (part in that.cache && !that.cache[part].length) { suggest([]); return; }
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}
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}
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that.timer = setTimeout(function(){ o.source(val, suggest) }, o.delay);
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}
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} else {
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that.last_val = val;
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that.sc.style.display = 'none';
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}
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}
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};
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addEvent(that, 'keyup', that.keyupHandler);
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that.focusHandler = function(e){
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that.last_val = '\n';
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that.keyupHandler(e)
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};
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addEvent(that, 'focus', that.focusHandler);
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}
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// public destroy method
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this.destroy = function(){
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for (var i=0; i<elems.length; i++) {
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var that = elems[i];
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removeEvent(window, 'resize', that.updateSC);
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removeEvent(that, 'blur', that.blurHandler);
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removeEvent(that, 'focus', that.focusHandler);
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removeEvent(that, 'keydown', that.keydownHandler);
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removeEvent(that, 'keyup', that.keyupHandler);
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if (that.autocompleteAttr)
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that.setAttribute('autocomplete', that.autocompleteAttr);
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else
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that.removeAttribute('autocomplete');
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try {
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if (o.selectorToInsert && document.querySelector(o.selectorToInsert).contains(that.sc)) {
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document.querySelector(o.selectorToInsert).removeChild(that.sc);
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} else {
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document.body.removeChild(that.sc);
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}
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} catch (error) {
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console.log('Destroying error: can\'t find target selector', error);
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throw error;
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}
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that = null;
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}
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};
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}
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return autoComplete;
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})();
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(function(){
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if (typeof define === 'function' && define.amd)
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define('autoComplete', function () { return autoComplete; });
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else if (typeof module !== 'undefined' && module.exports)
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module.exports = autoComplete;
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else
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window.autoComplete = autoComplete;
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})();
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