https://www.hussainiat.com/jquery/plugin/jquery.autocomplete.js

1(function($) {
2
3  var reEscape = new RegExp('(\\' + ['/', '.', '*', '+', '?', '|', '(', ')', '[', ']', '{', '}', '\\'].join('|\\') + ')', 'g');
4
5  function fnFormatResult(value, data, currentValue) {
6    var pattern = '(' + currentValue.replace(reEscape, '\\$1') + ')';
7    return value.replace(new RegExp(pattern, 'gi'), '<strong>$1<\/strong>');
8  }
9
10  function Autocomplete(el, options) {
11    this.el = $(el);
12    this.el.attr('autocomplete', 'off');
13    this.suggestions = [];
14    this.data = [];
15    this.badQueries = [];
16    this.selectedIndex = -1;
17    this.currentValue = this.el.val();
18    this.intervalId = 0;
19    this.cachedResponse = [];
20    this.onChangeInterval = null;
21    this.ignoreValueChange = false;
22    this.serviceUrl = options.serviceUrl;
23    this.isLocal = false;
24    this.options = {
25      autoSubmit: false,
26      minChars: 1,
27      maxHeight: 300,
28      deferRequestBy: 0,
29      width: 0,
30      highlight: true,
31      params: {},
32      fnFormatResult: fnFormatResult,
33      delimiter: null,
34      zIndex: 9999
35    };
36    this.initialize();
37    this.setOptions(options);
38  }
39  
40  $.fn.autocomplete = function(options) {
41    return new Autocomplete(this.get(0)||$('<input />'), options);
42  };
43
44
45  Autocomplete.prototype = {
46
47    killerFn: null,
48
49    initialize: function() {
50
51      var me, uid, autocompleteElId;
52      me = this;
53      uid = Math.floor(Math.random()*0x100000).toString(16);
54      autocompleteElId = 'Autocomplete_' + uid;
55
56      this.killerFn = function(e) {
57        if ($(e.target).parents('.autocomplete').size() === 0) {
58          me.killSuggestions();
59          me.disableKillerFn();
60        }
61      };
62
63      if (!this.options.width) { this.options.width = this.el.width(); }
64      this.mainContainerId = 'AutocompleteContainter_' + uid;
65
66      $('<div id="' + this.mainContainerId + '" style="position:absolute;z-index:9999;"><div class="autocomplete-w1"><div class="autocomplete" id="' + autocompleteElId + '" style="display:none; width:300px;"></div></div></div>').appendTo('body');
67
68      this.container = $('#' + autocompleteElId);
69      this.fixPosition();
70      if (window.opera) {
71        this.el.keypress(function(e) { me.onKeyPress(e); });
72      } else {
73        this.el.keydown(function(e) { me.onKeyPress(e); });
74      }
75      this.el.keyup(function(e) { me.onKeyUp(e); });
76      this.el.blur(function() { me.enableKillerFn(); });
77      this.el.focus(function() { me.fixPosition(); });
78    },
79    
80    setOptions: function(options){
81      var o = this.options;
82      $.extend(o, options);
83      if(o.lookup){
84        this.isLocal = true;
85        if($.isArray(o.lookup)){ o.lookup = { suggestions:o.lookup, data:[] }; }
86      }
87      $('#'+this.mainContainerId).css({ zIndex:o.zIndex });
88      this.container.css({ maxHeight: o.maxHeight + 'px', width:o.width });
89    },
90    
91    clearCache: function(){
92      this.cachedResponse = [];
93      this.badQueries = [];
94    },
95    
96    disable: function(){
97      this.disabled = true;
98    },
99    
100    enable: function(){
101      this.disabled = false;
102    },
103
104    fixPosition: function() {
105      var offset = this.el.offset();
106      $('#' + this.mainContainerId).css({ top: (offset.top + this.el.innerHeight()) + 'px', left: offset.left + 'px' });
107    },
108
109    enableKillerFn: function() {
110      var me = this;
111      $(document).bind('click', me.killerFn);
112    },
113
114    disableKillerFn: function() {
115      var me = this;
116      $(document).unbind('click', me.killerFn);
117    },
118
119    killSuggestions: function() {
120      var me = this;
121      this.stopKillSuggestions();
122      this.intervalId = window.setInterval(function() { me.hide(); me.stopKillSuggestions(); }, 300);
123    },
124
125    stopKillSuggestions: function() {
126      window.clearInterval(this.intervalId);
127    },
128
129    onKeyPress: function(e) {
130      if (this.disabled || !this.enabled) { return; }
131      // return will exit the function
132      // and event will not be prevented
133      switch (e.keyCode) {
134        case 27: //KEY_ESC:
135          this.el.val(this.currentValue);
136          this.hide();
137          break;
138        case 9: //KEY_TAB:
139        case 13: //KEY_RETURN:
140          if (this.selectedIndex === -1) {
141            this.hide();
142            return;
143          }
144          this.select(this.selectedIndex);
145          if(e.keyCode === 9){ return; }
146          break;
147        case 38: //KEY_UP:
148          this.moveUp();
149          break;
150        case 40: //KEY_DOWN:
151          this.moveDown();
152          break;
153        default:
154          return;
155      }
156      e.stopImmediatePropagation();
157      e.preventDefault();
158    },
159
160    onKeyUp: function(e) {
161      if(this.disabled){ return; }
162      switch (e.keyCode) {
163        case 38: //KEY_UP:
164        case 40: //KEY_DOWN:
165          return;
166      }
167      clearInterval(this.onChangeInterval);
168      if (this.currentValue !== this.el.val()) {
169        if (this.options.deferRequestBy > 0) {
170          // Defer lookup in case when value changes very quickly:
171          var me = this;
172          this.onChangeInterval = setInterval(function() { me.onValueChange(); }, this.options.deferRequestBy);
173        } else {
174          this.onValueChange();
175        }
176      }
177    },
178
179    onValueChange: function() {
180      clearInterval(this.onChangeInterval);
181      this.currentValue = this.el.val();
182      var q = this.getQuery(this.currentValue);
183      this.selectedIndex = -1;
184      if (this.ignoreValueChange) {
185        this.ignoreValueChange = false;
186        return;
187      }
188      if (q === '' || q.length < this.options.minChars) {
189        this.hide();
190      } else {

191        this.getSuggestions(q);
192      }
193    },
194
195    getQuery: function(val) {
196      var d, arr;
197      d = this.options.delimiter;
198      if (!d) { return $.trim(val); }
199      arr = val.split(d);
200      return $.trim(arr[arr.length - 1]);
201    },
202
203    getSuggestionsLocal: function(q) {
204      var ret, arr, len, val, i;
205      arr = this.options.lookup;
206      len = arr.suggestions.length;
207      ret = { suggestions:[], data:[] };
208      q = q.toLowerCase();
209      for(i=0; i< len; i++){
210        val = arr.suggestions[i];
211        if(val.toLowerCase().indexOf(q) === 0){
212          ret.suggestions.push(val);
213          ret.data.push(arr.data[i]);
214        }
215      }
216      return ret;
217    },
218    
219    getSuggestions: function(q) {
220      var cr, me;
221      cr = this.isLocal ? this.getSuggestionsLocal(q) : this.cachedResponse[q];
222      if (cr && $.isArray(cr.suggestions)) {
223        this.suggestions = cr.suggestions;
224        this.data = cr.data;
225        this.suggest();
226      } else if (!this.isBadQuery(q)) {
227        me = this;
228        me.options.params.query = q;
229        $.get(this.serviceUrl, me.options.params, function(txt) { me.processResponse(txt); }, 'text');
230      }
231    },
232
233    isBadQuery: function(q) {
234      var i = this.badQueries.length;
235      while (i--) {
236        if (q.indexOf(this.badQueries[i]) === 0) { return true; }
237      }
238      return false;
239    },
240
241    hide: function() {
242      this.enabled = false;
243      this.selectedIndex = -1;
244      this.container.hide();
245    },
246
247    suggest: function() {
248      if (this.suggestions.length === 0) {
249        this.hide();
250        return;
251      }
252
253      var me, len, div, f, v, i, s, mOver, mClick;
254      me = this;
255      len = this.suggestions.length;
256      f = this.options.fnFormatResult;
257      v = this.getQuery(this.currentValue);
258      mOver = function(xi) { return function() { me.activate(xi); }; };
259      mClick = function(xi) { return function() { me.select(xi); }; };
260      this.container.hide().empty();
261      for (i = 0; i < len; i++) {
262        s = this.suggestions[i];
263        div = $((me.selectedIndex === i ? '<div class="selected"' : '<div') + ' title="' + s + '">' + f(s, this.data[i], v) + '</div>');
264        div.mouseover(mOver(i));
265        div.click(mClick(i));
266        this.container.append(div);
267      }
268      this.enabled = true;
269      this.container.show();
270    },
271
272    processResponse: function(text) {
273      var response;
274      try {
275        response = eval('(' + text + ')');
276      } catch (err) { return; }
277      if (!$.isArray(response.data)) { response.data = []; }
278      if(!this.options.noCache){
279        this.cachedResponse[response.query] = response;
280        if (response.suggestions.length === 0) { this.badQueries.push(response.query); }
281      }
282      if (response.query === this.getQuery(this.currentValue)) {
283        this.suggestions = response.suggestions;
284        this.data = response.data;
285        this.suggest(); 
286      }
287    },
288
289    activate: function(index) {
290      var divs, activeItem;
291      divs = this.container.children();
292      // Clear previous selection:
293      if (this.selectedIndex !== -1 && divs.length > this.selectedIndex) {
294        $(divs.get(this.selectedIndex)).removeClass();
295      }
296      this.selectedIndex = index;
297      if (this.selectedIndex !== -1 && divs.length > this.selectedIndex) {
298        activeItem = divs.get(this.selectedIndex);
299        $(activeItem).addClass('selected');
300      }
301      return activeItem;
302    },
303
304    deactivate: function(div, index) {
305      div.className = '';
306      if (this.selectedIndex === index) { this.selectedIndex = -1; }
307    },
308
309    select: function(i) {
310      var selectedValue, f;
311      selectedValue = this.suggestions[i];
312      if (selectedValue) {
313        this.el.val(selectedValue);
314        if (this.options.autoSubmit) {
315          f = this.el.parents('form');
316          if (f.length > 0) { f.get(0).submit(); }
317        }
318        this.ignoreValueChange = true;
319        this.hide();
320        this.onSelect(i);
321      }
322    },
323
324    moveUp: function() {
325      if (this.selectedIndex === -1) { return; }
326      if (this.selectedIndex === 0) {
327        this.container.children().get(0).className = '';
328        this.selectedIndex = -1;
329        this.el.val(this.currentValue);
330        return;
331      }
332      this.adjustScroll(this.selectedIndex - 1);
333    },
334
335    moveDown: function() {
336      if (this.selectedIndex === (this.suggestions.length - 1)) { return; }
337      this.adjustScroll(this.selectedIndex + 1);
338    },
339
340    adjustScroll: function(i) {
341      var activeItem, offsetTop, upperBound, lowerBound;
342      activeItem = this.activate(i);
343      offsetTop = activeItem.offsetTop;
344      upperBound = this.container.scrollTop();
345      lowerBound = upperBound + this.options.maxHeight - 25;
346      if (offsetTop < upperBound) {
347        this.container.scrollTop(offsetTop);
348      } else if (offsetTop > lowerBound) {
349        this.container.scrollTop(offsetTop - this.options.maxHeight + 25);
350      }
351      this.el.val(this.getValue(this.suggestions[i]));
352    },
353
354    onSelect: function(i) {
355      var me, fn, s, d;
356      me = this;
357      fn = me.options.onSelect;
358      s = me.suggestions[i];
359      d = me.data[i];
360      me.el.val(me.getValue(s));
361      if ($.isFunction(fn)) { fn(s, d, me.el); }
362    },
363    
364    getValue: function(value){
365        var del, currVal, arr, me;
366        me = this;
367        del = me.options.delimiter;
368        if (!del) { return value; }
369        currVal = me.currentValue;
370        arr = currVal.split(del);
371        if (arr.length === 1) { return value; }
372        return currVal.substr(0, currVal.length - arr[arr.length - 1].length) + value;
373    }
374
375  };
376
377}(jQuery));