https://fsbobr.com/website/function/jquery/jquery.autocomplete.js

1jQuery.autocomplete = function(input, options) {
2	// Create a link to self
3	var me = this;
4
5	// Create jQuery object for input element
6	var $input = $(input).attr("autocomplete", "off");
7
8	// Apply inputClass if necessary
9	if (options.inputClass) $input.addClass(options.inputClass);
10
11	// Create results
12	var results = document.createElement("div");
13	// Create jQuery object for results
14	var $results = $(results);
15	$results.hide().addClass(options.resultsClass).css("position", "absolute");
16	if( options.width > 0 ) $results.css("width", options.width);
17
18	// Add to body element
19	$("body").append(results);
20
21	input.autocompleter = me;
22
23	var timeout = null;
24	var prev = "";
25	var active = -1;
26	var cache = {};
27	var keyb = false;
28	var hasFocus = false;
29	var lastKeyPressCode = null;
30
31	// flush cache
32	function flushCache(){
33		cache = {};
34		cache.data = {};
35		cache.length = 0;
36	};
37
38	// flush cache
39	flushCache();
40
41	// if there is a data array supplied
42	if( options.data != null ){
43		var sFirstChar = "", stMatchSets = {}, row = [];
44
45		// no url was specified, we need to adjust the cache length to make sure it fits the local data store
46		if( typeof options.url != "string" ) options.cacheLength = 1;
47
48		// loop through the array and create a lookup structure
49		for( var i=0; i < options.data.length; i++ ){
50			// if row is a string, make an array otherwise just reference the array
51			row = ((typeof options.data[i] == "string") ? [options.data[i]] : options.data[i]);
52
53			// if the length is zero, don't add to list
54			if( row[0].length > 0 ){
55				// get the first character
56				sFirstChar = row[0].substring(0, 1).toLowerCase();
57				// if no lookup array for this character exists, look it up now
58				if( !stMatchSets[sFirstChar] ) stMatchSets[sFirstChar] = [];
59				// if the match is a string
60				stMatchSets[sFirstChar].push(row);
61			}
62		}
63
64		// add the data items to the cache
65		for( var k in stMatchSets ){
66			// increase the cache size
67			options.cacheLength++;
68			// add to the cache
69			addToCache(k, stMatchSets[k]);
70		}
71	}
72
73	$input
74	.keydown(function(e) {
75		// track last key pressed
76		lastKeyPressCode = e.keyCode;
77		switch(e.keyCode) {
78			case 38: // up
79				e.preventDefault();
80				moveSelect(-1);
81				break;
82			case 40: // down
83				e.preventDefault();
84				moveSelect(1);
85				break;
86			case 9:  // tab
87			case 13: // return
88				if( selectCurrent() ){
89					// make sure to blur off the current field
90					$input.get(0).blur();
91					e.preventDefault();
92				}
93				break;
94			default:
95				active = -1;
96				if (timeout) clearTimeout(timeout);
97				timeout = setTimeout(function(){onChange();}, options.delay);
98				break;
99		}
100	})
101	.focus(function(){
102		// track whether the field has focus, we shouldn't process any results if the field no longer has focus
103		hasFocus = true;
104	})
105	.blur(function() {
106		// track whether the field has focus
107		hasFocus = false;
108		hideResults();
109	});
110
111	hideResultsNow();
112
113	function onChange() {
114		// ignore if the following keys are pressed: [del] [shift] [capslock]
115		if( lastKeyPressCode == 46 || (lastKeyPressCode > 8 && lastKeyPressCode < 32) ) return $results.hide();
116		var v = $input.val();
117		if (v == prev) return;
118		prev = v;
119		if (v.length >= options.minChars) {
120			$input.addClass(options.loadingClass);
121			requestData(v);
122		} else {
123			$input.removeClass(options.loadingClass);
124			$results.hide();
125		}
126	};
127
128 	function moveSelect(step) {
129
130		var lis = $("li", results);
131		if (!lis) return;
132
133		active += step;
134
135		if (active < 0) {
136			active = 0;
137		} else if (active >= lis.size()) {
138			active = lis.size() - 1;
139		}
140
141		lis.removeClass("ac_over");
142
143		$(lis[active]).addClass("ac_over");
144
145		// Weird behaviour in IE
146		// if (lis[active] && lis[active].scrollIntoView) {
147		// 	lis[active].scrollIntoView(false);
148		// }
149
150	};
151
152	function selectCurrent() {
153		var li = $("li.ac_over", results)[0];
154		if (!li) {
155			var $li = $("li", results);
156			if (options.selectOnly) {
157				if ($li.length == 1) li = $li[0];
158			} else if (options.selectFirst) {
159				li = $li[0];
160			}
161		}
162		if (li) {
163			selectItem(li);
164			return true;
165		} else {
166			return false;
167		}
168	};
169
170	function selectItem(li) {
171		if (!li) {
172			li = document.createElement("li");
173			li.extra = [];
174			li.selectValue = "";
175		}
176		var v = $.trim(li.selectValue ? li.selectValue : li.innerHTML);
177		input.lastSelected = v;
178		prev = v;
179		$results.html("");
180		$input.val(v);
181		hideResultsNow();
182		if (options.onItemSelect) setTimeout(function() { options.onItemSelect(li) }, 1);
183	};
184
185	// selects a portion of the input string
186	function createSelection(start, end){
187		// get a reference to the input element
188		var field = $input.get(0);
189		if( field.createTextRange ){
190			var selRange = field.createTextRange();
191			selRange.collapse(true);
192			selRange.moveStart("character", start);
193			selRange.moveEnd("character", end);
194			selRange.select();
195		} else if( field.setSelectionRange ){
196			field.setSelectionRange(start, end);
197		} else {
198			if( field.selectionStart ){
199				field.selectionStart = start;
200				field.selectionEnd = end;
201			}
202		}
203		field.focus();
204	};
205
206	// fills in the input box w/the first match (assumed to be the best match)
207	function autoFill(sValue){
208		// if the last user key pressed was backspace, don't autofill
209		if( lastKeyPressCode != 8 ){
210			// fill in the value (keep the case the user has typed)
211			$input.val($input.val() + sValue.substring(prev.length));
212			// select the portion of the value not typed by the user (so the next character will erase)
213			createSelection(prev.length, sValue.length);
214		}
215	};
216
217	function showResults() {
218		// get the position of the input field right now (in case the DOM is shifted)
219		var pos = findPos(input);
220		// either use the specified width, or autocalculate based on form element
221		var iWidth = (options.width > 0) ? options.width : $input.width();
222		// reposition
223		$results.css({
224			width: parseInt(iWidth) + "px",
225			top: (pos.y + input.offsetHeight) + "px",
226			left: pos.x + "px"
227		}).show();
228	};
229
230	function hideResults() {
231		if (timeout) clearTimeout(timeout);
232		timeout = setTimeout(hideResultsNow, 200);
233	};
234
235	function hideResultsNow() {
236		if (timeout) clearTimeout(timeout);
237		$input.removeClass(options.loadingClass);
238		if ($results.is(":visible")) {
239			$results.hide();
240		}
241		if (options.mustMatch) {
242			var v = $input.val();
243			if (v != input.lastSelected) {
244				selectItem(null);
245			}
246		}
247	};
248
249	function receiveData(q, data) {
250		if (data) {
251			$input.removeClass(options.loadingClass);
252			results.innerHTML = "";
253
254			// if the field no longer has focus or if there are no matches, do not display the drop down
255			if( !hasFocus || data.length == 0 ) return hideResultsNow();
256
257			if ($.browser.msie) {
258				// we put a styled iframe behind the calendar so HTML SELECT elements don't show through
259				$results.append(document.createElement('iframe'));
260			}
261			results.appendChild(dataToDom(data));
262			// autofill in the complete box w/the first match as long as the user hasn't entered in more data
263			if( options.autoFill && ($input.val().toLowerCase() == q.toLowerCase()) ) autoFill(data[0][0]);
264			showResults();
265		} else {
266			hideResultsNow();
267		}
268	};
269
270	function parseData(data) {
271		if (!data) return null;
272		var parsed = [];
273		var rows = data.split(options.lineSeparator);
274		for (var i=0; i < rows.length; i++) {
275			var row = $.trim(rows[i]);
276			if (row) {
277				parsed[parsed.length] = row.split(options.cellSeparator);
278			}
279		}
280		return parsed;
281	};
282
283	function dataToDom(data) {
284		var ul = document.createElement("ul");
285		var num = data.length;
286
287		// limited results to a max number
288		if( (options.maxItemsToShow > 0) && (options.maxItemsToShow < num) ) num = options.maxItemsToShow;
289
290		for (var i=0; i < num; i++) {
291			var row = data[i];
292			if (!row) continue;
293			var li = document.createElement("li");
294			if (options.formatItem) {
295				li.innerHTML = options.formatItem(row, i, num);
296				li.selectValue = row[0];
297			} else {
298				li.innerHTML = row[0];
299				li.selectValue = row[0];
300			}
301			var extra = null;
302			if (row.length > 1) {
303				extra = [];
304				for (var j=1; j < row.length; j++) {
305					extra[extra.length] = row[j];
306				}
307			}
308			li.extra = extra;
309			ul.appendChild(li);
310			$(li).hover(
311				function() { $("li", ul).removeClass("ac_over"); $(this).addClass("ac_over"); active = $("li", ul).indexOf($(this).get(0)); },
312				function() { $(this).removeClass("ac_over"); }
313			).click(function(e) { e.preventDefault(); e.stopPropagation(); selectItem(this) });
314		}
315		return ul;
316	};
317
318	function requestData(q) {
319		if (!options.matchCase) q = q.toLowerCase();
320		var data = options.cacheLength ? loadFromCache(q) : null;
321		// recieve the cached data
322		if (data) {
323			receiveData(q, data);
324		// if an AJAX url has been supplied, try loading the data now
325		} else if( (typeof options.url == "string") && (options.url.length > 0) ){
326			$.get(makeUrl(q), function(data) {
327				data = parseData(data);
328				addToCache(q, data);
329				receiveData(q, data);
330			});
331		// if there's been no data found, remove the loading class
332		} else {
333			$input.removeClass(options.loadingClass);
334		}
335	};
336
337	function makeUrl(q) {
338		var url = options.url + "?q=" + encodeURI(q);
339		for (var i in options.extraParams) {
340			url += "&" + i + "=" + encodeURI(options.extraParams[i]);
341		}
342		return url;
343	};
344
345	function loadFromCache(q) {
346		if (!q) return null;
347		if (cache.data[q]) return cache.data[q];
348		if (options.matchSubset) {
349			for (var i = q.length - 1; i >= options.minChars; i--) {
350				var qs = q.substr(0, i);
351				var c = cache.data[qs];
352				if (c) {
353					var csub = [];
354					for (var j = 0; j < c.length; j++) {
355						var x = c[j];
356						var x0 = x[0];
357						if (matchSubset(x0, q)) {
358							csub[csub.length] = x;
359						}
360					}
361					return csub;
362				}
363			}
364		}
365		return null;
366	};
367
368	function matchSubset(s, sub) {
369		if (!options.matchCase) s = s.toLowerCase();
370		var i = s.indexOf(sub);
371		if (i == -1) return false;
372		return i == 0 || options.matchContains;
373	};
374
375	this.flushCache = function() {
376		flushCache();
377	};
378
379	this.setExtraParams = function(p) {
380		options.extraParams = p;
381	};
382
383	this.findValue = function(){
384		var q = $input.val();
385
386		if (!options.matchCase) q = q.toLowerCase();
387		var data = options.cacheLength ? loadFromCache(q) : null;
388		if (data) {
389			findValueCallback(q, data);
390		} else if( (typeof options.url == "string") && (options.url.length > 0) ){
391			$.get(makeUrl(q), function(data) {
392				data = parseData(data)
393				addToCache(q, data);
394				findValueCallback(q, data);
395			});
396		} else {
397			// no matches
398			findValueCallback(q, null);
399		}
400	}
401
402	function findValueCallback(q, data){
403		if (data) $input.removeClass(options.loadingClass);
404
405		var num = (data) ? data.length : 0;
406		var li = null;
407
408		for (var i=0; i < num; i++) {
409			var row = data[i];
410
411			if( row[0].toLowerCase() == q.toLowerCase() ){
412				li = document.createElement("li");
413				if (options.formatItem) {
414					li.innerHTML = options.formatItem(row, i, num);
415					li.selectValue = row[0];
416				} else {
417					li.innerHTML = row[0];
418					li.selectValue = row[0];
419				}
420				var extra = null;
421				if( row.length > 1 ){
422					extra = [];
423					for (var j=1; j < row.length; j++) {
424						extra[extra.length] = row[j];
425					}
426				}
427				li.extra = extra;
428			}
429		}
430
431		if( options.onFindValue ) setTimeout(function() { options.onFindValue(li) }, 1);
432	}
433
434	function addToCache(q, data) {
435		if (!data || !q || !options.cacheLength) return;
436		if (!cache.length || cache.length > options.cacheLength) {
437			flushCache();
438			cache.length++;
439		} else if (!cache[q]) {
440			cache.length++;
441		}
442		cache.data[q] = data;
443	};
444
445	function findPos(obj) {
446		var curleft = obj.offsetLeft || 0;
447		var curtop = obj.offsetTop || 0;
448		while (obj = obj.offsetParent) {
449			curleft += obj.offsetLeft
450			curtop += obj.offsetTop
451		}
452		return {x:curleft,y:curtop};
453	}
454}
455
456jQuery.fn.autocomplete = function(url, options, data) {
457	// Make sure options exists
458	options = options || {};
459	// Set url as option
460	options.url = url;
461	// set some bulk local data
462	options.data = ((typeof data == "object") && (data.constructor == Array)) ? data : null;
463
464	// Set default values for required options
465	options.inputClass = options.inputClass || "ac_input";
466	options.resultsClass = options.resultsClass || "ac_results";
467	options.lineSeparator = options.lineSeparator || "\n";
468	options.cellSeparator = options.cellSeparator || "|";
469	options.minChars = options.minChars || 1;
470	options.delay = options.delay || 400;
471	options.matchCase = options.matchCase || 0;
472	options.matchSubset = options.matchSubset || 1;
473	options.matchContains = options.matchContains || 0;
474	options.cacheLength = options.cacheLength || 1;
475	options.mustMatch = options.mustMatch || 0;
476	options.extraParams = options.extraParams || {};
477	options.loadingClass = options.loadingClass || "ac_loading";
478	options.selectFirst = options.selectFirst || false;
479	options.selectOnly = options.selectOnly || false;
480	options.maxItemsToShow = options.maxItemsToShow || -1;
481	options.autoFill = options.autoFill || false;
482	options.width = parseInt(options.width, 10) || 0;
483
484	this.each(function() {
485		var input = this;
486		new jQuery.autocomplete(input, options);
487	});
488
489	// Don't break the chain
490	return this;
491}
492
493jQuery.fn.autocompleteArray = function(data, options) {
494	return this.autocomplete(null, options, data);
495}
496
497jQuery.fn.indexOf = function(e){

498	for( var i=0; i<this.length; i++ ){
499		if( this[i] == e ) return i;
500	}
501	return -1;
502};