// -_-_-_-_-_-_-_-_-_-_-_-_-  Usage Sample  -_-_-_-_-_-_-_-_-_-_-_-_-
//
// include the "farsitype.js" file to your <head> tag:
// <script language="javascript" src="farsi.js" type="text/javascript">
//
// add "lang" attribute with value "fa" to any <input> or <textarea> tags that you want to have FarsiType!
// <input type="text" name="whatever" lang="fa" /> or <textarea cols="30" rows="7" name="whatever" lang="fa"></textarea>
// (only the lang="fa" is important for FarsiType!)
//
// you can also have an enable/disable checkbox. (it's not necessary)
// <input  type="checkbox" id="disableFarsiType" />
//
// you can use F8 keybord button to change language instead of the change language button.


// insertAdjacentHTML(), insertAdjacentText() and insertAdjacentElement() for Netscape 6/Mozilla by Thor Larholm me@jscript.dk
if(typeof HTMLElement!="undefined" && ! HTMLElement.prototype.insertAdjacentElement) {
	HTMLElement.prototype.insertAdjacentElement = function (where,parsedNode) {
		switch (where) {
			case 'beforeBegin':
				this.parentNode.insertBefore(parsedNode,this)
				break;
			case 'afterBegin':
				this.insertBefore(parsedNode,this.firstChild);
				break;
			case 'beforeEnd':
				this.appendChild(parsedNode);
				break;
			case 'afterEnd':
				if (this.nextSibling)
					this.parentNode.insertBefore(parsedNode,this.nextSibling);
				else
					this.parentNode.appendChild(parsedNode);
				break;
		}
	}

	HTMLElement.prototype.insertAdjacentHTML = function (where,htmlStr) {
		var r = this.ownerDocument.createRange();
		r.setStartBefore(this);
		var parsedHTML = r.createContextualFragment(htmlStr);
		this.insertAdjacentElement(where,parsedHTML)
	}

	HTMLElement.prototype.insertAdjacentText = function (where,txtStr) {
		var parsedText = document.createTextNode(txtStr)
		this.insertAdjacentElement(where,parsedText)
	}
}

var FarsiType =
{
	// Farsi keyboard map based on Iran Popular Keyboard Layout
	farsiKey : [
	0x0020, 0x0021, 0x061B, 0x066B, 0x00A4, 0x066A, 0x060C, 0x06AF,
	0x0029, 0x0028, 0x002A, 0x002B, 0x0648, 0x002D, 0x002E, 0x002F,
	0x06F0, 0x06F1, 0x06F2, 0x06F3, 0x06F4, 0x06F5, 0x06F6, 0x06F7,
	0x06F8, 0x06F9, 0x003A, 0x06A9, 0x003E, 0x003D, 0x003C, 0x061F,
	0x066C, 0x0624, 0x200C, 0x0698, 0x064A, 0x064D, 0x0625, 0x0623,
	0x0622, 0x0651, 0x0629, 0x00BB, 0x00AB, 0x0621, 0x004E, 0x005D,
	0x005B, 0x0652, 0x064B, 0x0626, 0x064F, 0x064E, 0x0056, 0x064C,
	0x0058, 0x0650, 0x0643, 0x062C, 0x0698, 0x0686, 0x00D7, 0x0640,
	0x067E, 0x0634, 0x0630, 0x0632, 0x06CC, 0x062B, 0x0628, 0x0644,
	0x0627, 0x0647, 0x062A, 0x0646, 0x0645, 0x0626, 0x062F, 0x062E,
	0x062D, 0x0636, 0x0642, 0x0633, 0x0641, 0x0639, 0x0631, 0x0635,
	0x0637, 0x063A, 0x0638, 0x007D, 0x007C, 0x007B, 0x007E],
	Type : true,
	counter : 0
}

FarsiType.enable_disable = function(Dis) {
	var invis, obj;

	if (!Dis.checked)  {
		FarsiType.Type = true;
		invis = 'visible';
	}
	else {
		FarsiType.Type = false;
		invis = 'hidden';
	}

	for (var i=1; i<= FarsiType.counter; i++) {
		obj = document.getElementById('FarsiType_button_' + i);
		obj.style.visibility = invis;
	}
}

FarsiType.init = function() {

	var Inputs = document.getElementsByTagName('INPUT');
	for (var i=0; i<Inputs.length; i++) {
		if (Inputs[i].type.toLowerCase() == 'text' && Inputs[i].lang.toLowerCase() == 'fa') {
			FarsiType.counter++;
			new FarsiType.KeyObject(Inputs[i], FarsiType.counter);
		}
	}

	var Areas = document.getElementsByTagName('TEXTAREA');
	for (var i=0; i<Areas.length; i++) {
		if (Areas[i].lang.toLowerCase() == 'fa') {
			FarsiType.counter++;
			new FarsiType.KeyObject(Areas[i], FarsiType.counter);
		}
	}

	var Dis = document.getElementById('disableFarsiType')
	if (Dis != null) {
		FarsiType.enable_disable (Dis);
		Dis.onclick = new Function( "FarsiType.enable_disable (this);" )
	}
}

FarsiType.KeyObject = function(z,x) {

	z.insertAdjacentHTML("afterEnd", "<div style='display:none'><input type='button' id=FarsiType_button_"+x+" style='border: none; background-image:none;background-color:gray; font-size:10; color:white; font-family:tahoma; padding: 1px; margin: 1px; width: auto; height: auto;' value='FA' /></div>");
	z.bottelm = document.getElementById ('FarsiType_button_' + x);

	z.farsi = true;
	z.style.textAlign = "right";
	z.style.direction = "rtl";
	z.bottelm.title = 'Change lang to english';

	setSelectionRange = function(input, selectionStart, selectionEnd) {
		input.focus()
		input.setSelectionRange(selectionStart, selectionEnd)
	}

	isChangeLang = function(e) {
		if (e == null) e = window.event;
		var key = e.keyCode ? e.keyCode : e.charCode;
		if (key == 119) ChangeLang();
	}

	ChangeLang = function() {
		if (z.farsi) {
			z.style.textAlign = "left";
			z.style.direction = "ltr";
			z.farsi = false;
			z.bottelm.value = "EN";
			z.bottelm.title = 'Change lang to persian'
		}
		else {
			z.style.textAlign = "right";
			z.style.direction = "rtl";
			z.farsi = true;
			z.bottelm.value = "FA";
			z.bottelm.title = 'Change lang to english'
		}
		z.focus();
	}

	Convert = function(e) {

		if (FarsiType.Type) {

			if (e == null) e = window.event;
			eElement = (e.srcElement) ? e.srcElement : e.originalTarget;

			var key = e.keyCode ? e.keyCode : e.charCode;
			if (navigator.userAgent.toLowerCase().indexOf('opera')>-1) key = e.which;

			if ( (e.charCode != null) && (e.charCode != key) )	return;
			if (e.ctrlKey || e.altKey || e.metaKey || key == 13 || key == 27 || key == 8) return;

			//check windows lang
			if (key>128){
				alert("شما نمی توانید از فارسی ساز ویندوز برای تغییر زبان استفاده کنید لطفا زبان خور را بر روی زبان انگلیسی قرار دهید\nPlease change your windows language to English");
				return false;
			}

			// if Farsi
			if (z.farsi && key > 31 && key < 128) {

				//check CpasLock
				if ( (key >= 65 && key <= 90) && !e.shiftKey ) {
					alert("Caps Lock is On. To prevent entering farsi incorrectly, you should press Caps Lock to turn it off.");
					return false;
				}
				else if ( (key >= 97 && key <= 122 ) && e.shiftKey ) {
					alert("Caps Lock is On. To prevent entering farsi incorrectly, you should press Caps Lock to turn it off.");
					return false;
				}

				// Shift-space -> ZWNJ
				if (key == 32 && e.shiftKey)
					key = 8204;
				else
					key = FarsiType.farsiKey[key-32];

				// to farsi
				try {
					// IE
					e.keyCode = key
				}
				catch(error) {
					try {
						// Gecko before
						e.initKeyEvent("keypress", true, true, document.defaultView, false, false, true, false, 0, key, eElement);
					}
					catch(error) {
						try {
							// Gecko & Opera now
							var nScrollTop = eElement.scrollTop;
							var nScrollLeft = eElement.scrollLeft;
							var nScrollWidth = eElement.scrollWidth;

							replaceString = String.fromCharCode(key);

							var selectionStart = eElement.selectionStart;
							var selectionEnd = eElement.selectionEnd;
							eElement.value = eElement.value.substring(0, selectionStart) + replaceString + eElement.value.substring(selectionEnd);
							setSelectionRange(eElement, selectionStart + replaceString.length, selectionStart + replaceString.length);

							var nW = eElement.scrollWidth - nScrollWidth;
							if (eElement.scrollTop == 0) { eElement.scrollTop = nScrollTop }

							e.preventDefault()
						}
						catch(error) {
							// else no farsi type!
							alert('Sorry! no FarsiType support')
							FarsiType.Type = false;

							var Dis = document.getElementById('disableFarsiType')
							if (Dis != null) {
								Dis.disabled = true;
								Dis.checked = true;
							}

							for (var i=1; i<= FarsiType.counter; i++) {
								document.getElementById('FarsiType_button_' + i).style.visibility = 'hidden';
							}
							return false;
						}
					}
				}
			}
		}
		return true;
	}

	z.bottelm.onmouseup = ChangeLang;
	z.onkeydown = isChangeLang;
	z.onkeypress = Convert;
}

if (window.attachEvent) {
	window.attachEvent('onload', FarsiType.init)
}
else if (window.addEventListener) {
	window.addEventListener('load', FarsiType.init, false)
}�