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Auto-suggest Control

, 10 Oct 2009 Zlib
This article presents code that augments any INPUT box with an auto-suggest feature, AJAX-capable
autosuggest_src.zip
arrow-down-d.gif
arrow-down.gif
arrow-up-d.gif
arrow-up.gif
autosuggest_stable_src.zip
arrow-down.gif
arrow-down-d.gif
arrow-up.gif
arrow-up-d.gif
/* Auto-suggest/auto-complete control
 *
 * original code:
 * (C) 2004-2005 zichun
 *
 * fixes and heavy modifications:
 * (C) 2007 Dmitriy Khudorozhkov (kh_dmitry2001@mail.ru) and contributors.
 *
 * This software is provided "as-is", without any express or implied warranty.
 * In no event will the author be held liable for any damages arising from the
 * use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source distribution.
 */ 

var suggesturl = ""; // Global link to the server-side script, that gives you the suggestion list.
                     // Used for controls that do not define their own server script urls.
// pre-load images:
var image = new Array(4);

image[0] = new Image(), image[1] = new Image(),
image[2] = new Image(), image[3] = new Image();

image[0].src = "arrow-down.gif", image[1].src = "arrow-down-d.gif";
image[2].src = "arrow-up.gif",   image[3].src = "arrow-up-d.gif"; 

function actb(id, ca, url)
{
	// Public Variables:
	this.actb_suggesturl  = url || suggesturl;   // link to the server-side script, that gives you the suggestion list
	this.actb_timeOut     = -1;                  // autocomplete Timeout in ms (-1: autocomplete never time out)
	this.actb_lim         = 5;                   // number of elements autocomplete can show (-1: no limit)
	this.actb_firstText   = true;                // should the auto complete be limited to the beginning of keyword?
	this.actb_fullRefresh = false;               // should the script re-send the AJAX request after each entered character?
	this.actb_useIFrame   = false;               // should the control use an IFrame element to fix suggestion list positioning (MS IE only)?
	this.actb_useScroll   = true;                // should the control use a scroll bar (true) or a up/down buttons (false)?
	this.actb_mouse       = true;                // enable Mouse Support
	this.actb_noDefault   = true;                // should the control omit selecting the 1st item in a suggestion list?
	this.actb_delimiter   = new Array(';', ','); // delimiter for multiple autocomplete. Set it to empty array for single autocomplete
	this.actb_startcheck  = 0;                   // show widget only after this number of characters is typed in.

	this.actb_selectedIndex = -1;                // index (zero-based) of the element last chosen

	// Styles:
	this.actb_arColor   = '#656291';  // background color for the "arrows"
	this.actb_bgColor   = '#FFFFFF';
	this.actb_textColor = '#000000';
	this.actb_hColor    = '#D6D7E7';
	this.actb_fFamily   = 'verdana,arial,helvetica';
	this.actb_arrowSize = "7px";
	this.actb_fSize     = '10px';
	this.actb_hStyle    = 'font-family:verdana,arial,helvetica;';

	// "Private" Variables:
	this.actb_delimwords = [];
	this.actb_cdelimword = 0;
	this.actb_delimchar  = [];
	this.actb_display    = false;

	this.actb_pos    = 0;
	this.actb_total  = 0;
	this.actb_rangeu = 0;
	this.actb_ranged = 0;
	this.actb_bool   = [];
	this.actb_pre    = 0;
	this.actb_toid   = 0;
	this.actb_tomake = false;

	this.cur_x = 0;
	this.cur_y = 0;
	this.cur_w = 0;
	this.cur_h = 0;

	this.actb_mouse_on_list = 1;
	this.actb_caretmove     = false;

	this.actb_base_id  = id;
	this.actb_curr     = document.getElementById(id);
	this.actb_keywords = [];

	ca = ca || [];
	for(var i = 0, cl = ca.length; i < cl; i++)
		this.actb_keywords[i] = ca[i];

	return this.construct();
};

actb.prototype = {

	callLater: function(func, obj)
	{ return function() { func.call(obj) }; },

	construct: function()
	{
		this.actb_curr.actb = this;

		// pre-create event functions
		this.funcClick = this.actb_mouseclick;
		this.funcCheck = this.actb_checkkey;

		this.funcHighlight = this.actb_table_highlight;
		
		this.funcClear = this.callLater(this.actb_clear,    this);
		this.funcPress = this.callLater(this.actb_keypress, this);

		this.funcUp   = this.callLater(this.actb_goup,   this);
		this.funcDown = this.callLater(this.actb_godown, this);

		this.funcFocus   = this.callLater(this.actb_table_focus,   this);
		this.funcUnfocus = this.callLater(this.actb_table_unfocus, this);

		addEvent(this.actb_curr, "focus", this.callLater(this.actb_setup, this));

		return this;
	},

	actb_setup: function()
	{
		addEvent(document,       "keydown",  this.funcCheck);
		addEvent(this.actb_curr, "blur",     this.funcClear);
		addEvent(document,       "keypress", this.funcPress);
	},

	actb_clear: function()
	{
		var msie  = (document.all && !window.opera) ? true : false;
		var event = window.event;

		var doblur = true;
		if(msie && event && this.cur_h)
		{
			var x = event.x, y = event.y;

			if(((x > this.cur_x) && (x < (this.cur_x + this.cur_w))) && ((y > this.cur_y) && (y < (this.cur_y + this.cur_h))))
			{
				this.actb_curr.focus();
				doblur = false;
			}
		}

		if(doblur)
		{
			removeEvent(document,       "keydown",  this.funcCheck);
			removeEvent(this.actb_curr, "blur",     this.funcClear);
			removeEvent(document,       "keypress", this.funcPress);

			this.actb_removedisp();
		}
	},

	actb_parse: function(n)
	{
	    var t, plen;
		if(this.actb_delimiter.length > 0)
		{
			   t = this.actb_delimwords[this.actb_cdelimword].trim().addslashes();
			plen = this.actb_delimwords[this.actb_cdelimword].trim().length;
		}
		else
		{
			   t = this.actb_curr.value.addslashes();
			plen = this.actb_curr.value.length;
		}

		var tobuild = '';

		var re = this.actb_firstText ? new RegExp("^" + t, "i") : new RegExp(t, "i");
		var p = n.search(re);

		tobuild = n.substr(0, p);

		tobuild += "<u><font style='" + (this.actb_hStyle) + "'>";

		tobuild += n.substring(p, plen + p);

		tobuild += "</font></u>";

		tobuild += n.substring(plen + p, n.length);

		return tobuild;
	},

	actb_generate: function()
	{
		if(document.getElementById('tat_table_' + this.actb_base_id))
		{
		  this.actb_display = false;
		  document.body.removeChild(document.getElementById('tat_table_' + this.actb_base_id));
		}

		if(this.actb_total == 0)
		{
			this.actb_display = false;
			return;
		}

		var msie = (document.all && !window.opera) ? true : false;

		var bb = document.createElement('div');
		bb.id  = 'tat_table_' + this.actb_base_id;
		bb.style.position = 'absolute';
		bb.style.border = '#000000 solid 1px';
		this.cur_y = bb.style.top = eval(curTop(this.actb_curr) + this.actb_curr.offsetHeight) + "px";
		this.cur_x = bb.style.left = curLeft(this.actb_curr) + "px";
		this.cur_w = bb.style.width = this.actb_curr.offsetWidth + "px";

		var cc = null;
		if(msie && this.actb_useIFrame)
		{
			var cc = document.createElement('iframe');

			cc.src = "";
			cc.scrolling = "no";
			cc.frameBorder = "0";

			cc.style.position = "absolute";

			cc.style.zIndex = -1;
			cc.style.filter = "progid:DXImageTransform.Microsoft.Alpha(opacity=0);";
		}

		var a = document.createElement('table');
		a.cellSpacing ='1px';
		a.cellPadding ='2px';
		a.style.width  = "100%";
		a.style.backgroundColor = this.actb_bgColor;
		a.id = 'tat_table2_' + this.actb_base_id;

		if(this.actb_useScroll && (this.actb_total > this.actb_lim))
		{
			this.cur_h = bb.style.height = (this.actb_lim * parseInt(this.actb_fSize) + 3) + 2 + "px";

			bb.style.overflow  = "auto";
			bb.style.overflowX = "hidden";
		}

		this.cur_y = parseInt(this.cur_y);
		this.cur_h = parseInt(this.cur_h);
		this.cur_x = parseInt(this.cur_x);
		this.cur_w = parseInt(this.cur_w);

		document.body.appendChild(bb);
		if(cc)
		{
			cc.style.top  = a.offsetTop;
			cc.style.left = a.offsetLeft;

			bb.appendChild(cc);
		}
		bb.appendChild(a);

		var first = true, j = 1;

		if(this.actb_mouse)
		{
			a.onmouseout = this.funcUnfocus;
			a.onmouseover = this.funcFocus;
		}

		var counter = 0;
		for(var i = 0; i < this.actb_keywords.length; i++)
		{
			if(!this.actb_useScroll && ((this.actb_keywords.length > this.actb_lim) && (this.actb_total > this.actb_lim) && !i))
			{
				var r = a.insertRow(-1);
				r.style.backgroundColor = this.actb_arColor;

				var c = r.insertCell(-1);
				c.style.color = this.actb_textColor;
				c.style.fontFamily = 'arial narrow';
				c.style.fontSize = this.actb_arrowSize;
				c.style.cursor = 'default';
				c.align = 'center';

				replaceHTML(c, image[3]);
				addEvent(c, "click", this.funcUp);
			}

			if(this.actb_bool[i] && (this.actb_useScroll || (counter < this.actb_lim)))
			{
				counter++;
				var r = a.insertRow(-1);
				if(first && !this.actb_noDefault && !this.actb_tomake)
				{
					r.style.backgroundColor = this.actb_hColor;
					first = false;
					this.actb_pos = counter;
				}
				else if(this.actb_pre == i)
				{
					r.style.backgroundColor = this.actb_hColor;
					first = false;
					this.actb_pos = counter;
				}
				else
				{
					r.style.backgroundColor = this.actb_bgColor;
				}

				r.id = 'tat_tr_' + this.actb_base_id + j;

				var c = r.insertCell(-1);
				c.style.color = this.actb_textColor;
				c.style.fontFamily = this.actb_fFamily;
				c.style.fontSize = this.actb_fSize;
				c.innerHTML = this.actb_parse(this.actb_keywords[i]);
				c.id = 'tat_td_' + this.actb_base_id + j;
				c.actb = this; 
				c.setAttribute('pos', j);

				if(this.actb_mouse)
				{
					c.style.cursor = 'pointer';
					addEvent(c, "click", this.funcClick);
					c.onmouseover = this.funcHighlight;
				}

				j++;
			}
		}

		if(!this.actb_useScroll && (this.actb_total > this.actb_lim))
		{
			var r = a.insertRow(-1);
			r.style.backgroundColor = this.actb_arColor;

			var c = r.insertCell(-1);
			c.style.color = this.actb_textColor;
			c.style.fontFamily = 'arial narrow';
			c.style.fontSize = this.actb_arrowSize;
			c.style.cursor = "pointer";
			c.align = 'center';
			replaceHTML(c, image[0]);

			addEvent(c, "click", this.funcDown);
		}

		this.actb_rangeu = 1;
		this.actb_ranged = j - 1;
		this.actb_display = true;
	},

	actb_remake: function()
	{
		var a = document.getElementById('tat_table2_' + this.actb_base_id);

		if(this.actb_mouse)
		{
			a.onmouseout  = this.funcUnfocus;
			a.onmouseover = this.funcFocus;
		}

		var i, k = 0;
		var first = true;
		var j = 1;

		if(this.actb_total > this.actb_lim)
		{
		    var b = (this.actb_rangeu > 1);

			var r = a.rows[k++];
			r.style.backgroundColor = this.actb_arColor;

			var c = r.firstChild;
			c.style.color = this.actb_textColor;
			c.style.fontFamily = 'arial narrow';
			c.style.fontSize = this.actb_arrowSize;
			c.style.cursor = 'default';
			c.align = 'center';

			replaceHTML(c, b ? image[2] : image[3]);

			if(b)
			{
				addEvent(c, "click", this.funcUp);
				c.style.cursor = 'pointer';
			}
			else
			{
				c.style.cursor = 'default';
			}
		}

		for(var i = 0; i < this.actb_keywords.length; i++)
		{
			if(this.actb_bool[i])
			{
				if(j >= this.actb_rangeu && j <= this.actb_ranged)
				{
					var r = a.rows[k++];
					r.style.backgroundColor = this.actb_bgColor;
					r.id = 'tat_tr_' + this.actb_base_id + j;

					var c = r.firstChild;
					c.style.color = this.actb_textColor;
					c.style.fontFamily = this.actb_fFamily;
					c.style.fontSize = this.actb_fSize;
					c.innerHTML = this.actb_parse(this.actb_keywords[i]);
					c.id = 'tat_td_' + this.actb_base_id + j;
					c.setAttribute('pos', j);
					j++;
				}
				else
				{
					j++;
				}
			}

			if(j > this.actb_ranged) break;
		}

		if(this.actb_keywords.length > this.actb_lim)
		{
			var b = ((j - 1) < this.actb_total);

			var r = a.rows[k];
			r.style.backgroundColor = this.actb_arColor;

			var c = r.firstChild;
			c.style.color = this.actb_textColor;
			c.style.fontFamily = 'arial narrow';
			c.style.fontSize = this.actb_arrowSize;
			c.style.cursor = 'default';
			c.align = 'center';

			replaceHTML(c, b ? image[0] : image[1]);

			if(b)
			{
				addEvent(c, "click", this.funcDown);
				c.style.cursor = 'pointer';
			}
			else
			{
				c.style.cursor = 'default';
			}
		}
	},
 
	actb_goup: function()
	{
		this.actb_curr.focus(); 

		if(!this.actb_display) return;
		if(this.actb_pos <= 1) return;

		var t = document.getElementById('tat_tr_' + this.actb_base_id + this.actb_pos);
		if(t && t.style) t.style.backgroundColor = this.actb_bgColor;

		this.actb_pos--;
		t = document.getElementById('tat_tr_' + this.actb_base_id + this.actb_pos);

		if(this.actb_useScroll)
		{
			var base = document.getElementById('tat_table_' + this.actb_base_id);
			base.scrollTop = t.offsetTop;
		}
		else
		{
			if(this.actb_pos < this.actb_rangeu)
			{
				this.actb_rangeu--;
				this.actb_ranged--;
				this.actb_remake();
			}
		}

		if(t && t.style) t.style.backgroundColor = this.actb_hColor;

		if(this.actb_toid)
		{
			clearTimeout(this.actb_toid);
			this.actb_toid = 0;
		}

		if(this.actb_timeOut > 0)
		  this.actb_toid = setTimeout(function() { this.actb_mouse_on_list = 1; this.actb_removedisp(); }, this.actb_timeOut);

		this.actb_curr.focus(); 
	},

	actb_godown: function()
	{
		this.actb_curr.focus(); 

		if(!this.actb_display) return;
		if(this.actb_pos == this.actb_total) return;

		if(this.actb_pos >= 1)
		{
			var t = document.getElementById('tat_tr_' + this.actb_base_id + this.actb_pos);
			if(t && t.style) t.style.backgroundColor = this.actb_bgColor;
		}
		else
		{
			this.actb_pos = 0;
		}

		this.actb_pos++;
		t = document.getElementById('tat_tr_' + this.actb_base_id + this.actb_pos);

		if(this.actb_useScroll)
		{
			var base = document.getElementById('tat_table_' + this.actb_base_id);
			base.scrollTop = t.offsetTop;
		}
		else
		{
			if(this.actb_pos > this.actb_ranged)
			{
				this.actb_rangeu++;
				this.actb_ranged++;
				this.actb_remake();
			}
		}

		if(t && t.style) t.style.backgroundColor = this.actb_hColor;

		if(this.actb_toid)
		{
			clearTimeout(this.actb_toid);
			this.actb_toid = 0;
		}

		if(this.actb_timeOut > 0)
			this.actb_toid = setTimeout(function() { this.actb_mouse_on_list = 1; this.actb_removedisp(); }, this.actb_timeOut);

		this.actb_curr.focus();
	},

	actb_mouseclick: function(event)
	{
		var elem = getTargetElement(event);
		if(!elem.id) elem = elem.parentNode;

		var obj = elem.actb; 
		if(!obj.actb_display) return;

		obj.actb_mouse_on_list = 0;
		obj.actb_pos = elem.getAttribute('pos');
		obj.actb_selectedIndex = obj.actb_pos - 1;
		obj.actb_penter();
	},

	actb_table_focus: function()
	{ this.actb_mouse_on_list = 1; },

	actb_table_unfocus: function()
	{
		this.actb_mouse_on_list = 0;

		if(this.actb_toid)
		{
			clearTimeout(this.actb_toid);
			this.actb_toid = 0;
		}

		if(this.actb_timeOut > 0)
			this.actb_toid = setTimeout(function() { obj.actb_mouse_on_list = 0; this.actb_removedisp(); }, this.actb_timeOut);
	},

	actb_table_highlight: function(event)
	{
		var elem = getTargetElement(event);

		var obj = elem.actb;
		if(!obj) return;

		obj.actb_mouse_on_list = 1;

		var row = document.getElementById('tat_tr_' + obj.actb_base_id + obj.actb_pos);
		if(row && row.style) row.style.backgroundColor = obj.actb_bgColor;

		obj.actb_pos = elem.getAttribute('pos');

		row = document.getElementById('tat_tr_' + obj.actb_base_id + obj.actb_pos);
		if(row && row.style)
			row.style.backgroundColor = obj.actb_hColor;

		if(obj.actb_toid)
		{
			clearTimeout(obj.actb_toid);
			obj.actb_toid = 0;
		}

		if(obj.actb_timeOut > 0)
			obj.actb_toid = setTimeout(function() { obj.actb_mouse_on_list = 0; obj.actb_removedisp(); }, obj.actb_timeOut);
	},
 
 	actb_penter: function()
	{
		if(!this.actb_display) return;
		if(this.actb_pos < 1) return;

		this.actb_display = false;

		var word = '', c = 0;
		for(var i = 0; i <= this.actb_keywords.length; i++)
		{
			if(this.actb_bool[i]) c++;
			if(c == this.actb_pos)
			{
				word = this.actb_keywords[i];
				break;
			}
		}

		this.actb_insertword(word);
	},

	actb_insertword: function(a)
	{
		if(this.actb_delimiter.length > 0)
		{
			var str = '';

			for(var i = 0; i < this.actb_delimwords.length; i++)
			{
				if(this.actb_cdelimword == i)
				{
					prespace = postspace = '';
					gotbreak = false;
					for(var j = 0; j < this.actb_delimwords[i].length; ++j)
					{
						if(this.actb_delimwords[i].charAt(j) != ' ')
						{
							gotbreak = true;
							break;
						}

						prespace += ' ';
					}

					for(j = this.actb_delimwords[i].length - 1; j >= 0; --j)
					{
						if(this.actb_delimwords[i].charAt(j) != ' ') break;
						postspace += ' ';
					}

					str += prespace;
					str += a;
					if(gotbreak) str += postspace;
				}
				else
				{
					str += this.actb_delimwords[i];
				}

				if(i != this.actb_delimwords.length - 1)
					str += this.actb_delimchar[i];
			}

			this.actb_curr.value = str;
			setCaret(this.actb_curr, this.actb_curr.value.length);
		}
		else
		{
			this.actb_curr.value = a;
		}

		this.actb_mouse_on_list = 0;
		this.actb_removedisp();
	},

	actb_removedisp: function()
	{
		if(this.actb_mouse_on_list == 0)
		{
			this.actb_display = 0;

			var base = document.getElementById('tat_table_' + this.actb_base_id);
			if(base)
			  document.body.removeChild(base);

			if(this.actb_toid)
			{
			  clearTimeout(this.actb_toid);
			  this.actb_toid = 0;
			}

			this.cur_x = 0;
			this.cur_y = 0;
			this.cur_w = 0;
			this.cur_h = 0;
		}
	},

	actb_keypress: function(e)
	{
		if(this.actb_caretmove) stopEvent(e);
		return !this.actb_caretmove;
	},

	actb_checkkey: function(event)
	{
		event = event || window.event;

		var code = event.keyCode;
		var obj = getTargetElement(event).actb; 
		obj.actb_caretmove = 0;

		var term = "";

		if(obj.actb_toid)
		{
			clearTimeout(obj.actb_toid);
			obj.actb_toid = 0;
		}

		switch(code)
		{
			case 38:
				obj.actb_goup();
				obj.actb_caretmove = 1;
				return false;
				break;

			case 40:
				obj.actb_godown();
				obj.actb_caretmove = 1;
				return false;
				break;

			case 27:
				term = obj.actb_curr.value;

				obj.actb_mouse_on_list = 0;
				obj.actb_removedisp();
				break;

			case 13:
				if(obj.actb_display)
				{
					obj.actb_caretmove = 1;
					obj.actb_penter();
					return false;
				}
				break;

			case 9:
				if(obj.actb_display || obj.actb_toid)
				{
					obj.actb_caretmove = 1;
					obj.actb_penter();

					setTimeout(function() { obj.actb_curr.focus(); }, 25);
					return false;
				}
				break;

			default:
				obj.actb_toid = setTimeout(function() { obj.actb_tocomplete.call(obj, code) }, 500);
				break;
		}

		if(term.length) setTimeout(function() { obj.actb_curr.value = term; }, 25);
		return true;
	},

	actb_tocomplete: function(kc)
	{
		if(this.actb_toid)
		{
			clearTimeout(this.actb_toid);
			this.actb_toid = 0;
		}
		else
		{
			return;
		}

		if(kc == 38 || kc == 40 || kc == 13) return;

		if(this.actb_display)
		{ 
			var word = 0;
			var c = 0;

			for(var i = 0; i <= this.actb_keywords.length; i++)
			{
				if(this.actb_bool[i]) c++;

				if(c == this.actb_pos)
				{
					word = i;
					break;
				}
			}
			
			this.actb_pre = word;
		}
		else
		{
			this.actb_pre = -1;
		}
		
		if(this.actb_curr.value == '')
		{
			this.actb_mouse_on_list = 0;
			this.actb_removedisp();
		}

		var ot, t;

		if(this.actb_delimiter.length > 0)
		{
			var caret_pos_end = this.actb_curr.value.length;

			var delim_split = '';
			for(var i = 0; i < this.actb_delimiter.length; i++)
				delim_split += this.actb_delimiter[i];

		    delim_split = delim_split.addslashes();
			var delim_split_rx = new RegExp("([" + delim_split + "])");
			c = 0;
			this.actb_delimwords = [];
			this.actb_delimwords[0] = '';

			for(var i = 0, j = this.actb_curr.value.length; i < this.actb_curr.value.length; i++, j--)
			{
				if(this.actb_curr.value.substr(i, j).search(delim_split_rx) == 0)
				{
					ma = this.actb_curr.value.substr(i,j).match(delim_split_rx);
					this.actb_delimchar[c] = ma[1];
					c++;
					this.actb_delimwords[c] = '';
				}
				else
				{
					this.actb_delimwords[c] += this.actb_curr.value.charAt(i);
				}
			}

			var l = 0;
			this.actb_cdelimword = -1;
			for(i = 0; i < this.actb_delimwords.length; i++)
			{
				if((caret_pos_end >= l) && (caret_pos_end <= l + this.actb_delimwords[i].length))
					this.actb_cdelimword = i;

				l += this.actb_delimwords[i].length + 1;
			}

			ot = this.actb_delimwords[this.actb_cdelimword].trim(); 
			 t = this.actb_delimwords[this.actb_cdelimword].addslashes().trim();
		}
		else
		{
			ot = this.actb_curr.value;
			 t = this.actb_curr.value.addslashes();
		}

		if(ot.length == 0)
		{
			this.actb_mouse_on_list = 0;
			this.actb_removedisp();
		}
		else if((ot.length == 1) || this.actb_fullRefresh ||
		       ((ot.length > 1) && !this.actb_keywords.length) ||
		       ((ot.length > 1) && (this.actb_keywords[0].substr(0, 1).toLowerCase() != ot.substr(0, 1).toLowerCase())))
		{
			var ot_ = ((ot.length > 1) && !this.actb_fullRefresh) ? ot.substr(0, 1) : ot;

			if(this.actb_suggesturl.length)
			{
				// create xmlhttprequest object:
				var http = null;
				if(typeof XMLHttpRequest != 'undefined')
				{
					try
					{
						http = new XMLHttpRequest();
					}
					catch (e) { http = null; }
				}
				else
				{
					try
					{
						http = new ActiveXObject("Msxml2.XMLHTTP") ;
					}
					catch (e)
					{
						try
						{
							http = new ActiveXObject("Microsoft.XMLHTTP") ;
						}
						catch (e) {	http = null; }
					}
				}

				if(http)
				{
					// For local debugging in Mozilla/Firefox only!
					/*try
					{
						netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
					} catch (e) { }*/

					if(http.overrideMimeType)
						http.overrideMimeType('text/xml');

					http.open("GET", this.actb_suggesturl + ot_, true);

					var obj = this;
					http.onreadystatechange = function(n)
					{
						if(http.readyState == 4)
						{
							if((http.status == 200) || (http.status == 0))
							{
								var xmlDocument = null, tmpinfo = null;

								try
								{
									xmlDocument = http.responseXML;
									tmpinfo = xmlDocument.getElementsByTagName('listdata').item(0).firstChild.data;
								}
								catch(e)
								{
									try
									{
										xmlDocument = (new DOMParser()).parseFromString(http.responseText, "text/xml");
										tmpinfo = xmlDocument.getElementsByTagName('listdata').item(0).firstChild.data;
									}
									catch(ee) {}
								}

								obj.actb_keywords = tmpinfo.split('|');
								obj.done.call(obj, ot_, t);
							}
						}
					}

					http.send(null);
				}

				// xmlhttp object creation failed
				return;
			}
			else
			{
				this.done(ot, t);
			}
		}
		else
		{
			this.done(ot, t);
		}
	},

	done: function(ot, t)
	{
		if(ot.length < this.actb_startcheck) return;

		var re = new RegExp("^" + t, "i");

		this.actb_total = 0;
		this.actb_tomake = false;

		var al = this.actb_keywords.length;

		for(var i = 0; i < al; i++)
		{
			this.actb_bool[i] = false;
			if(re.test(this.actb_keywords[i]))
			{
				this.actb_total++;
				this.actb_bool[i] = true;

				if(this.actb_pre == i) this.actb_tomake = true;
			}
		}

		if(!this.actb_firstText)
		{
			var tmp = [];

			for(i = 0; i < al; i++)
			{
				if(this.actb_bool[i])
					tmp[tmp.length] = this.actb_keywords[i];
			}

			re = new RegExp(t, "i");

			for(i = 0; i < al; i++)
			{
				if(re.test(this.actb_keywords[i]) && !this.actb_bool[i])
				{
					this.actb_total++;
					this.actb_bool[i] = true;

					if(this.actb_pre == i) this.actb_tomake = true;

					tmp[tmp.length] = this.actb_keywords[i];
				}
			}

			for(i = 0; i < al; i++)
			{
				if(!this.actb_bool[i])
					tmp[tmp.length] = this.actb_keywords[i];
			}

			for(i = 0; i < al; i++)
				this.actb_keywords[i] = tmp[i];

			for(i = 0; i < al; i++)
				this.actb_bool[i] = (i < this.actb_total) ? true : false;
		}

		if(this.actb_timeOut > 0)
		  this.actb_toid = setTimeout(function(){ this.actb_mouse_on_list = 0; this.actb_removedisp(); }, this.actb_timeOut);

		this.actb_generate();
	}
}

// Supplementary functions

// Add an event to the obj given
// event_name refers to the event trigger, without the "on", like click or mouseover
// func_name refers to the function callback when event is triggered
function addEvent(obj, event_name, func_ref)
{
	if(obj.addEventListener && !window.opera)
	{
		obj.addEventListener(event_name, func_ref, true);
	}
	else
	{
		obj["on" + event_name] = func_ref;
	}
}

// Removes an event from the object
function removeEvent(obj, event_name, func_ref)
{
	if(obj.removeEventListener && !window.opera)
	{
		obj.removeEventListener(event_name, func_ref, true);
	}
	else
	{
		obj["on" + event_name] = null;
	}
}

// Stop an event from bubbling up the event DOM
function stopEvent(event)
{
	event = event || window.event;
	
	if(event.stopPropagation) event.stopPropagation();
	if(event.preventDefault) event.preventDefault();

	if(typeof event.cancelBubble != "undefined")
	{
		event.cancelBubble = true;
		event.returnValue = false;
	}

	return false;
}

// Get the obj that triggers off the event
function getTargetElement(event)
{
	event = event || window.event;
	return event.srcElement || event.target;
}
   
// Sets the caret position to l in the object
function setCaret(obj, l)
{
	obj.focus();

	if(obj.setSelectionRange)
	{
		obj.setSelectionRange(l, l);
	}
	else if(obj.createTextRange)
	{
		m = obj.createTextRange();		
		m.moveStart('character', l);
		m.collapse();
		m.select();
	}
}

// String functions
String.prototype.addslashes = function() { return this.replace(/(["\\\.\|\[\]\^\*\+\?\$\(\)])/g, '\\$1'); }

String.prototype.trim = function () { return this.replace(/^\s*(\S*(\s+\S+)*)\s*$/, "$1"); };

// Offset position from top of the screen
function curTop(obj)
{
	var toreturn = 0;
	while(obj)
	{
		toreturn += obj.offsetTop - (window.opera ? 0 : obj.scrollTop);
		obj = obj.offsetParent;
	}

	return toreturn;
}

// Offset position from left of the screen
function curLeft(obj)
{
	var toreturn = 0;
	while(obj)
	{
		toreturn += obj.offsetLeft - (window.opera ? 0 : obj.scrollLeft);
		obj = obj.offsetParent;
	}

	return toreturn;
}

// Image installation
function replaceHTML(obj, oImg)
{
	var el = obj.childNodes[0];
	while(el)
	{
		obj.removeChild(el);
		el = obj.childNodes[0];
	}

	obj.appendChild(oImg);
}

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About the Author

Dmitry Khudorozhkov
Software Developer Freelance software engineer
Russian Federation Russian Federation
Dmitry Khudorozhkov began programming (and gaming) with his ZX Spectrum in 1989. Having seen and used all IBM PCs from early XT to the latest x64 machines, now Dmitry is a freelance programmer, living in Moscow, Russia. He is a graduate of the Moscow State Institute of Electronics and Mathematics (Applied Mathematics).

He is proficient in:

- C/C++ - more that 9 years of experience. Pure Win32 API/MFC desktop programming, networking (BSD/Win sockets), databases (primarily SQLite), OpenGL;

- JavaScript - more that 6 years of experience. Client-side components, AJAX, jQuery installation and customization;

- Firefox extensions (immediatelly ready for addons.mozilla.org reviewing) and Greasemonkey scripts. As an example of extensions Dmitry made you can search for FoxyPrices or WhatBird Winged Toolbar;

- XML and it's applications (last 2 years): XSLT (+ XPath), XSD, SVG, VML;

- ASP.NET/C# (webservices mostly);

Also familiar with (= entry level):

- PHP;

- HTML/CSS slicing.

Trying to learn:

- Ruby/Ruby-on-Rails;

- Czech language.

If you wish to express your opinion, ask a question or report a bug, feel free to e-mail:dmitrykhudorozhkov@yahoo.com. Job offers are warmly welcome.

If you wish to donate - and, by doing so, support further development - you can send Dmitry a bonus through the Rentacoder.com service (registration is free, Paypal is supported). Russian users can donate to the Yandex.Money account 41001132298694.

-

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