;(function($) {


$.fn.ajaxSubmit = function(options) {
	
	if (!this.length) {
		log('ajaxSubmit: skipping submit process - no element selected');
		return this;
	}

	if (typeof options == 'function') {
		options = { success: options };
	}

	var action = this.attr('action');
	var url = (typeof action === 'string') ? $.trim(action) : '';
	if (url) {
		
		url = (url.match(/^([^#]+)/)||[])[1];
	}
	url = url || window.location.href || '';

	options = $.extend(true, {
		url:  url,
		type: this.attr('method') || 'GET',
		iframeSrc: /^https/i.test(window.location.href || '') ? 'javascript:false' : 'about:blank'
	}, options);

	
	var veto = {};
	this.trigger('form-pre-serialize', [this, options, veto]);
	if (veto.veto) {
		log('ajaxSubmit: submit vetoed via form-pre-serialize trigger');
		return this;
	}

	
	if (options.beforeSerialize && options.beforeSerialize(this, options) === false) {
		log('ajaxSubmit: submit aborted via beforeSerialize callback');
		return this;
	}

	var n,v,a = this.formToArray(options.semantic);
	if (options.data) {
		options.extraData = options.data;
		for (n in options.data) {
			if(options.data[n] instanceof Array) {
				for (var k in options.data[n]) {
					a.push( { name: n, value: options.data[n][k] } );
				}
			}
			else {
				v = options.data[n];
				v = $.isFunction(v) ? v() : v; 
				a.push( { name: n, value: v } );
			}
		}
	}

	
	if (options.beforeSubmit && options.beforeSubmit(a, this, options) === false) {
		log('ajaxSubmit: submit aborted via beforeSubmit callback');
		return this;
	}

	
	this.trigger('form-submit-validate', [a, this, options, veto]);
	if (veto.veto) {
		log('ajaxSubmit: submit vetoed via form-submit-validate trigger');
		return this;
	}

	var q = $.param(a);

	if (options.type.toUpperCase() == 'GET') {
		options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + q;
		options.data = null;  
	}
	else {
		options.data = q; 
	}

	var $form = this, callbacks = [];
	if (options.resetForm) {
		callbacks.push(function() { $form.resetForm(); });
	}
	if (options.clearForm) {
		callbacks.push(function() { $form.clearForm(); });
	}

	
	if (!options.dataType && options.target) {
		var oldSuccess = options.success || function(){};
		callbacks.push(function(data) {
			var fn = options.replaceTarget ? 'replaceWith' : 'html';
			$(options.target)[fn](data).each(oldSuccess, arguments);
		});
	}
	else if (options.success) {
		callbacks.push(options.success);
	}

	options.success = function(data, status, xhr) { 
		var context = options.context || options;   
		for (var i=0, max=callbacks.length; i < max; i++) {
			callbacks[i].apply(context, [data, status, xhr || $form, $form]);
		}
	};

	
	var fileInputs = $('input:file', this).length > 0;
	var mp = 'multipart/form-data';
	var multipart = ($form.attr('enctype') == mp || $form.attr('encoding') == mp);

	
   if (options.iframe !== false && (fileInputs || options.iframe || multipart)) {
	   
	   if (options.closeKeepAlive) {
		   $.get(options.closeKeepAlive, fileUpload);
		}
	   else {
		   fileUpload();
		}
   }
   else {
	   $.ajax(options);
   }

	
	this.trigger('form-submit-notify', [this, options]);
	return this;


	
	function fileUpload() {
		var form = $form[0];

		if ($(':input[name=submit],:input[id=submit]', form).length) {
			
			alert('Error: Form elements must not have name or id of "submit".');
			return;
		}
		
		var s = $.extend(true, {}, $.ajaxSettings, options);
		s.context = s.context || s;
		var id = 'jqFormIO' + (new Date().getTime()), fn = '_'+id;
		window[fn] = function() {
			var f = $io.data('form-plugin-onload');
			if (f) {
				f();
				window[fn] = undefined;
				try { delete window[fn]; } catch(e){}
			}
		}
		var $io = $('<iframe id="' + id + '" name="' + id + '" src="'+ s.iframeSrc +'" onload="window[\'_\'+this.id]()" />');
		var io = $io[0];

		$io.css({ position: 'absolute', top: '-1000px', left: '-1000px' });

		var xhr = { // mock object
			aborted: 0,
			responseText: null,
			responseXML: null,
			status: 0,
			statusText: 'n/a',
			getAllResponseHeaders: function() {},
			getResponseHeader: function() {},
			setRequestHeader: function() {},
			abort: function() {
				this.aborted = 1;
				$io.attr('src', s.iframeSrc); // abort op in progress
			}
		};

		var g = s.global;
		
		if (g && ! $.active++) {
			$.event.trigger("ajaxStart");
		}
		if (g) {
			$.event.trigger("ajaxSend", [xhr, s]);
		}

		if (s.beforeSend && s.beforeSend.call(s.context, xhr, s) === false) {
			if (s.global) { 
				$.active--;
			}
			return;
		}
		if (xhr.aborted) {
			return;
		}

		var cbInvoked = false;
		var timedOut = 0;


		var sub = form.clk;
		if (sub) {
			var n = sub.name;
			if (n && !sub.disabled) {
				s.extraData = s.extraData || {};
				s.extraData[n] = sub.value;
				if (sub.type == "image") {
					s.extraData[n+'.x'] = form.clk_x;
					s.extraData[n+'.y'] = form.clk_y;
				}
			}
		}

		
		function doSubmit() {
			
			var t = $form.attr('target'), a = $form.attr('action');

			// update form attrs in IE friendly way
			form.setAttribute('target',id);
			if (form.getAttribute('method') != 'POST') {
				form.setAttribute('method', 'POST');
			}
			if (form.getAttribute('action') != s.url) {
				form.setAttribute('action', s.url);
			}

			// ie borks in some cases when setting encoding
			if (! s.skipEncodingOverride) {
				$form.attr({
					encoding: 'multipart/form-data',
					enctype:  'multipart/form-data'
				});
			}

			// support timout
			if (s.timeout) {
				setTimeout(function() { timedOut = true; cb(); }, s.timeout);
			}

			// add "extra" data to form if provided in options
			var extraInputs = [];
			try {
				if (s.extraData) {
					for (var n in s.extraData) {
						extraInputs.push(
							$('<input type="hidden" name="'+n+'" value="'+s.extraData[n]+'" />')
								.appendTo(form)[0]);
					}
				}

				// add iframe to doc and submit the form
				$io.appendTo('body');
				$io.data('form-plugin-onload', cb);
				form.submit();
			}
			finally {
				// reset attrs and remove "extra" input elements
				form.setAttribute('action',a);
				if(t) {
					form.setAttribute('target', t);
				} else {
					$form.removeAttr('target');
				}
				$(extraInputs).remove();
			}
		}

		if (s.forceSync) {
			doSubmit();
		}
		else {
			setTimeout(doSubmit, 10); // this lets dom updates render
		}
	
		var data, doc, domCheckCount = 50;

		function cb() {
			if (cbInvoked) {
				return;
			}

			$io.removeData('form-plugin-onload');
			
			var ok = true;
			try {
				if (timedOut) {
					throw 'timeout';
				}
				// extract the server response from the iframe
				doc = io.contentWindow ? io.contentWindow.document : io.contentDocument ? io.contentDocument : io.document;
				
				var isXml = s.dataType == 'xml' || doc.XMLDocument || $.isXMLDoc(doc);
				log('isXml='+isXml);
				if (!isXml && window.opera && (doc.body == null || doc.body.innerHTML == '')) {
					if (--domCheckCount) {
						// in some browsers (Opera) the iframe DOM is not always traversable when
						// the onload callback fires, so we loop a bit to accommodate
						log('requeing onLoad callback, DOM not available');
						setTimeout(cb, 250);
						return;
					}
					
				}

				//log('response detected');
				cbInvoked = true;
				xhr.responseText = doc.documentElement ? doc.documentElement.innerHTML : null; 
				xhr.responseXML = doc.XMLDocument ? doc.XMLDocument : doc;
				xhr.getResponseHeader = function(header){
					var headers = {'content-type': s.dataType};
					return headers[header];
				};

				var scr = /(json|script)/.test(s.dataType);
				if (scr || s.textarea) {
					// see if user embedded response in textarea
					var ta = doc.getElementsByTagName('textarea')[0];
					if (ta) {
						xhr.responseText = ta.value;
					}
					else if (scr) {
						// account for browsers injecting pre around json response
						var pre = doc.getElementsByTagName('pre')[0];
						var b = doc.getElementsByTagName('body')[0];
						if (pre) {
							xhr.responseText = pre.textContent;
						}
						else if (b) {
							xhr.responseText = b.innerHTML;
						}
					}			  
				}
				else if (s.dataType == 'xml' && !xhr.responseXML && xhr.responseText != null) {
					xhr.responseXML = toXml(xhr.responseText);
				}
				data = $.httpData(xhr, s.dataType);
			}
			catch(e){
				log('error caught:',e);
				ok = false;
				xhr.error = e;
				$.handleError(s, xhr, 'error', e);
			}

			// ordering of these callbacks/triggers is odd, but that's how $.ajax does it
			if (ok) {
				s.success.call(s.context, data, 'success', xhr);
				if (g) {
					$.event.trigger("ajaxSuccess", [xhr, s]);
				}
			}
			if (g) {
				$.event.trigger("ajaxComplete", [xhr, s]);
			}
			if (g && ! --$.active) {
				$.event.trigger("ajaxStop");
			}
			if (s.complete) {
				s.complete.call(s.context, xhr, ok ? 'success' : 'error');
			}

			// clean up
			setTimeout(function() {
				$io.removeData('form-plugin-onload');
				$io.remove();
				xhr.responseXML = null;
			}, 100);
		}

		function toXml(s, doc) {
			if (window.ActiveXObject) {
				doc = new ActiveXObject('Microsoft.XMLDOM');
				doc.async = 'false';
				doc.loadXML(s);
			}
			else {
				doc = (new DOMParser()).parseFromString(s, 'text/xml');
			}
			return (doc && doc.documentElement && doc.documentElement.tagName != 'parsererror') ? doc : null;
		}
	}
};


$.fn.ajaxForm = function(options) {
	// in jQuery 1.3+ we can fix mistakes with the ready state
	if (this.length === 0) {
		var o = { s: this.selector, c: this.context };
		if (!$.isReady && o.s) {
			log('DOM not ready, queuing ajaxForm');
			$(function() {
				$(o.s,o.c).ajaxForm(options);
			});
			return this;
		}
		// is your DOM ready?  http://docs.jquery.com/Tutorials:Introducing_$(document).ready()
		log('terminating; zero elements found by selector' + ($.isReady ? '' : ' (DOM not ready)'));
		return this;
	}
	
	return this.ajaxFormUnbind().bind('submit.form-plugin', function(e) {
		if (!e.isDefaultPrevented()) { // if event has been canceled, don't proceed
			e.preventDefault();
			$(this).ajaxSubmit(options);
		}
	}).bind('click.form-plugin', function(e) {
		var target = e.target;
		var $el = $(target);
		if (!($el.is(":submit,input:image"))) {
			// is this a child element of the submit el?  (ex: a span within a button)
			var t = $el.closest(':submit');
			if (t.length == 0) {
				return;
			}
			target = t[0];
		}
		var form = this;
		form.clk = target;
		if (target.type == 'image') {
			if (e.offsetX != undefined) {
				form.clk_x = e.offsetX;
				form.clk_y = e.offsetY;
			} else if (typeof $.fn.offset == 'function') { // try to use dimensions plugin
				var offset = $el.offset();
				form.clk_x = e.pageX - offset.left;
				form.clk_y = e.pageY - offset.top;
			} else {
				form.clk_x = e.pageX - target.offsetLeft;
				form.clk_y = e.pageY - target.offsetTop;
			}
		}
		// clear form vars
		setTimeout(function() { form.clk = form.clk_x = form.clk_y = null; }, 100);
	});
};

// ajaxFormUnbind unbinds the event handlers that were bound by ajaxForm
$.fn.ajaxFormUnbind = function() {
	return this.unbind('submit.form-plugin click.form-plugin');
};


$.fn.formToArray = function(semantic) {
	var a = [];
	if (this.length === 0) {
		return a;
	}

	var form = this[0];
	var els = semantic ? form.getElementsByTagName('*') : form.elements;
	if (!els) {
		return a;
	}
	
	var i,j,n,v,el,max,jmax;
	for(i=0, max=els.length; i < max; i++) {
		el = els[i];
		n = el.name;
		if (!n) {
			continue;
		}

		if (semantic && form.clk && el.type == "image") {
			// handle image inputs on the fly when semantic == true
			if(!el.disabled && form.clk == el) {
				a.push({name: n, value: $(el).val()});
				a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
			}
			continue;
		}

		v = $.fieldValue(el, true);
		if (v && v.constructor == Array) {
			for(j=0, jmax=v.length; j < jmax; j++) {
				a.push({name: n, value: v[j]});
			}
		}
		else if (v !== null && typeof v != 'undefined') {
			a.push({name: n, value: v});
		}
	}

	if (!semantic && form.clk) {
		// input type=='image' are not found in elements array! handle it here
		var $input = $(form.clk), input = $input[0];
		n = input.name;
		if (n && !input.disabled && input.type == 'image') {
			a.push({name: n, value: $input.val()});
			a.push({name: n+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
		}
	}
	return a;
};


$.fn.formSerialize = function(semantic) {
	//hand off to jQuery.param for proper encoding
	return $.param(this.formToArray(semantic));
};


$.fn.fieldSerialize = function(successful) {
	var a = [];
	this.each(function() {
		var n = this.name;
		if (!n) {
			return;
		}
		var v = $.fieldValue(this, successful);
		if (v && v.constructor == Array) {
			for (var i=0,max=v.length; i < max; i++) {
				a.push({name: n, value: v[i]});
			}
		}
		else if (v !== null && typeof v != 'undefined') {
			a.push({name: this.name, value: v});
		}
	});
	//hand off to jQuery.param for proper encoding
	return $.param(a);
};


$.fn.fieldValue = function(successful) {
	for (var val=[], i=0, max=this.length; i < max; i++) {
		var el = this[i];
		var v = $.fieldValue(el, successful);
		if (v === null || typeof v == 'undefined' || (v.constructor == Array && !v.length)) {
			continue;
		}
		v.constructor == Array ? $.merge(val, v) : val.push(v);
	}
	return val;
};


$.fieldValue = function(el, successful) {
	var n = el.name, t = el.type, tag = el.tagName.toLowerCase();
	if (successful === undefined) {
		successful = true;
	}

	if (successful && (!n || el.disabled || t == 'reset' || t == 'button' ||
		(t == 'checkbox' || t == 'radio') && !el.checked ||
		(t == 'submit' || t == 'image') && el.form && el.form.clk != el ||
		tag == 'select' && el.selectedIndex == -1)) {
			return null;
	}

	if (tag == 'select') {
		var index = el.selectedIndex;
		if (index < 0) {
			return null;
		}
		var a = [], ops = el.options;
		var one = (t == 'select-one');
		var max = (one ? index+1 : ops.length);
		for(var i=(one ? index : 0); i < max; i++) {
			var op = ops[i];
			if (op.selected) {
				var v = op.value;
				if (!v) { // extra pain for IE...
					v = (op.attributes && op.attributes['value'] && !(op.attributes['value'].specified)) ? op.text : op.value;
				}
				if (one) {
					return v;
				}
				a.push(v);
			}
		}
		return a;
	}
	return $(el).val();
};


$.fn.clearForm = function() {
	return this.each(function() {
		$('input,select,textarea', this).clearFields();
	});
};

/**
 * Clears the selected form elements.
 */
$.fn.clearFields = $.fn.clearInputs = function() {
	return this.each(function() {
		var t = this.type, tag = this.tagName.toLowerCase();
		if (t == 'text' || t == 'password' || tag == 'textarea') {
			this.value = '';
		}
		else if (t == 'checkbox' || t == 'radio') {
			this.checked = false;
		}
		else if (tag == 'select') {
			this.selectedIndex = -1;
		}
	});
};


$.fn.resetForm = function() {
	return this.each(function() {
		// guard against an input with the name of 'reset'
		// note that IE reports the reset function as an 'object'
		if (typeof this.reset == 'function' || (typeof this.reset == 'object' && !this.reset.nodeType)) {
			this.reset();
		}
	});
};


$.fn.enable = function(b) {
	if (b === undefined) {
		b = true;
	}
	return this.each(function() {
		this.disabled = !b;
	});
};


$.fn.selected = function(select) {
	if (select === undefined) {
		select = true;
	}
	return this.each(function() {
		var t = this.type;
		if (t == 'checkbox' || t == 'radio') {
			this.checked = select;
		}
		else if (this.tagName.toLowerCase() == 'option') {
			var $sel = $(this).parent('select');
			if (select && $sel[0] && $sel[0].type == 'select-one') {
				// deselect all other options
				$sel.find('option').selected(false);
			}
			this.selected = select;
		}
	});
};

function log() {
	if ($.fn.ajaxSubmit.debug) {
		var msg = '[jquery.form] ' + Array.prototype.join.call(arguments,'');
		if (window.console && window.console.log) {
			window.console.log(msg);
		}
		else if (window.opera && window.opera.postError) {
			window.opera.postError(msg);
		}
	}
};

})(jQuery);