/*
 * jQuery Form Plugin
 * @requires jQuery v1.1 or later
 *
 * Examples at: http://malsup.com/jquery/form/
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Revision: $Id: jquery.form.js 3028 2007-08-31 13:37:36Z joern.zaefferer $
 */
(function($) {
$.fn.ajaxSubmit = function(options) {
	if (typeof options == 'function')
		options = { success: options };

	options = $.extend({
		url:  this.attr('action') || window.location,
		type: this.attr('method') || 'POST'//'GET'
	}, options || {});
	var veto = {};
	$.event.trigger('form.pre.serialize', [this, options, veto]);
	if (veto.veto) return this;
	// give pre-submit callback an opportunity to abort the submit
	if (options.beforeSubmit && options.beforeSubmit(a, this, options) === false) return this;

	var a = this.formToArray(options.semantic);
	if (options.data) {
		for (var n in options.data)
			a.push( { name: n, value: options.data[n] } );
	}
	// fire vetoable 'validate' event
	$.event.trigger('form.submit.validate', [a, this, options, veto]);
	if (veto.veto) return this;

	var q = $.param(a);//.replace(/%20/g,'+');

	if (options.type.toUpperCase() == 'GET') {
			options.url += (options.url.indexOf('?') >= 0 ? '&' : '?') + q;
			options.data = null;  // data is null for 'get'
	}
	else
			options.data = q; // data is the query string for 'post'

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

	// perform a load on the target only if dataType is not provided
	if (!options.dataType && options.target) {
			var oldSuccess = options.success || function(){};
			callbacks.push(function(data) {
					if (this.evalScripts)
							$(options.target).attr("innerHTML", data).evalScripts().each(oldSuccess, arguments);
					else // jQuery v1.1.4
							$(options.target).html(data).each(oldSuccess, arguments);
			});
	}
	else if (options.success)
			callbacks.push(options.success);

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

	// are there files to upload?
	var files = $('input:file', this).fieldValue();
	var found = false;
	for (var j=0; j < files.length; j++)
			if (files[j])
					found = true;

	if (options.iframe || found) // options.iframe allows user to force iframe mode
			fileUpload();
	else
			$.ajax(options);

	// fire 'notify' event
	$.event.trigger('form.submit.notify', [this, options]);
	return this;

	// private function for handling file uploads (hat tip to YAHOO!)
	function fileUpload() {
			var form = $form[0];
			var opts = $.extend({}, $.ajaxSettings, options);

			var id = 'jqFormIO' + $.fn.ajaxSubmit.counter++;
			var $io = $('<iframe id="' + id + '" name="' + id + '" />');
			var io = $io[0];
			var op8 = $.browser.opera && window.opera.version() < 9;
			if ($.browser.msie || op8) io.src = 'javascript:false;document.write("");';
			$io.css({ position: 'absolute', top: '-1000px', left: '-1000px' });

			var xhr = { // mock object
					responseText: null,
					responseXML: null,
					status: 0,
					statusText: 'n/a',
					getAllResponseHeaders: function() {},
					getResponseHeader: function() {},
					setRequestHeader: function() {}
			};

			var g = opts.global;
			// trigger ajax global events so that activity/block indicators work like normal
			if (g && ! $.active++) $.event.trigger("ajaxStart");
			if (g) $.event.trigger("ajaxSend", [xhr, opts]);

			var cbInvoked = 0;
			var timedOut = 0;

			// take a breath so that pending repaints get some cpu time before the upload starts
			setTimeout(function() {
					$io.appendTo('body');
					// jQuery's event binding doesn't work for iframe events in IE
					io.attachEvent ? io.attachEvent('onload', cb) : io.addEventListener('load', cb, false);

					// make sure form attrs are set
					var encAttr = form.encoding ? 'encoding' : 'enctype';
					$form.attr('oldtarget', $form.attr('target'));
					form.oldtarget = form.target;
					$form.attr({
							target:   id,
							method:  'POST',
							action:   opts.url
					});
					form[encAttr] = 'multipart/form-data';
					// support timout
					if (opts.timeout)
							setTimeout(function() { timedOut = true; cb(); }, opts.timeout);
					form.submit();
			}, 10);

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

					io.detachEvent ? io.detachEvent('onload', cb) : io.removeEventListener('load', cb, false);

					var ok = true;
					try {
							if (timedOut) throw 'timeout';
							// extract the server response from the iframe
							var data, doc;
							doc = io.contentWindow ? io.contentWindow.document : io.contentDocument ? io.contentDocument : io.document;
							xhr.responseText = doc.body ? doc.body.innerHTML : null;
							xhr.responseXML = doc.XMLDocument ? doc.XMLDocument : doc;

							if (opts.dataType == 'json' || opts.dataType == 'script') {
									var ta = doc.getElementsByTagName('textarea')[0];
									data = ta ? ta.value : xhr.responseText;
									if (opts.dataType == 'json')
											eval("data = " + data);
									else
											$.globalEval(data);
							}
							else if (opts.dataType == 'xml') {
									data = xhr.responseXML;
									if (!data && xhr.responseText != null)
											data = toXml(xhr.responseText);
							}
							else {
									data = xhr.responseText;
							}
					}
					catch(e){
							ok = false;
							$.handleError(opts, xhr, 'error', e);
					}

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

					// clean up
					setTimeout(function() {
							$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.ajaxSubmit.counter = 0; // used to create unique iframe ids

$.fn.ajaxForm = function(options) {
		return this.ajaxFormUnbind().submit(submitHandler).each(function() {
				// store options in hash
				this.formPluginId = $.fn.ajaxForm.counter++;
				$.fn.ajaxForm.optionHash[this.formPluginId] = options;
				$(":submit,input:image", this).click(clickHandler);
		});
};

$.fn.ajaxForm.counter = 1;
$.fn.ajaxForm.optionHash = {};

function clickHandler(e) {
		var $form = this.form;
		$form.clk = this;
		if (this.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 = $(this).offset();
						$form.clk_x = e.pageX - offset.left;
						$form.clk_y = e.pageY - offset.top;
				} else {
						$form.clk_x = e.pageX - this.offsetLeft;
						$form.clk_y = e.pageY - this.offsetTop;
				}
		}
		// clear form vars
		setTimeout(function() { $form.clk = $form.clk_x = $form.clk_y = null; }, 10);
};

function submitHandler() {
		// retrieve options from hash
		var id = this.formPluginId;
		var options = $.fn.ajaxForm.optionHash[id];
		$(this).ajaxSubmit(options);
		return false;
};

$.fn.ajaxFormUnbind = function() {return this;
		this.unbind('submit', submitHandler);
		return this.each(function() {
				$(":submit,input:image", this).unbind('click', clickHandler);
		});

};

$.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;
		for(var i=0, max=els.length; i < max; i++) {
				var el = els[i];
				var 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+'.x', value: form.clk_x}, {name: n+'.y', value: form.clk_y});
						continue;
				}

				var v = $.fieldValue(el, true);
				if (v && v.constructor == Array) {
						for(var 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 them here
				var inputs = form.getElementsByTagName("input");
				for(var i=0, max=inputs.length; i < max; i++) {
						var input = inputs[i];
						var n = input.name;
						if(n && !input.disabled && input.type == "image" && form.clk == input)
								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 (typeof 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) {
								// extra pain for IE...
								var v = $.browser.msie && !(op.attributes['value'].specified) ? op.text : op.value;
								if (one) return v;
								a.push(v);
						}
				}
				return a;
		}
		return el.value;
};

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

$.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();
		});
};

})(jQuery);