/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* 2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence,
   see documentation or authors website for more details */

function sack(file) {
	this.xmlhttp = null;

	this.resetData = function() {
		this.webroot = webroot;
		this.method = "POST";
  		this.queryStringSeparator = "?";
		this.argumentSeparator = "&";
		this.URLString = "";
		this.encodeURIString = false;
  		this.execute = false;
		this.execJavascript = false;
  		this.element = null;
		this.elementObj = null;
		this.requestFile = file;
		this.vars = new Object();
		this.responseStatus = new Array(2);
  	};

	this.resetFunctions = function() {
  		this.onLoading = function() { };
  		this.onLoaded = function() { };
  		this.onInteractive = function() { };
  		this.onCompletion = function() { };
  		this.onError = function() { };
		this.onFail = function() { };
	};

	this.reset = function() {
		this.resetFunctions();
		this.resetData();
	};

	this.submitForm = function(form_name) {
		this.URLString += this.convertFormDataToPostContent(form_name);
	}

	this.createAJAX = function() {
		try {
			this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e1) {
			try {
				this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) {
				this.xmlhttp = null;
			}
		}

		if (! this.xmlhttp) {
			if (typeof XMLHttpRequest != "undefined") {
				this.xmlhttp = new XMLHttpRequest();
			} else {
				this.failed = true;
			}
		}
	};

	this.setVar = function(name, value){
		this.vars[name] = Array(value, false);
	};

	this.encVar = function(name, value, returnvars) {
		if (true == returnvars) {
			//return Array(name, value);
			return Array(encodeURIComponent(name), encodeURIComponent(value));
		} else {
			//this.vars[name] = Array(value, true);
			this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
		}
	}

	this.processURLString = function(string, encode) {
		encoded = encodeURIComponent(this.argumentSeparator);
		regexp = new RegExp(this.argumentSeparator + "|" + encoded);
		varArray = string.split(regexp);
		for (i = 0; i < varArray.length; i++){
			urlVars = varArray[i].split("=");
			if (true == encode){
				this.encVar(urlVars[0], urlVars[1]);
			} else {
				this.setVar(urlVars[0], urlVars[1]);
			}
		}
	}

	this.createURLString = function(urlstring) {
		if (this.encodeURIString && this.URLString.length) {
			this.processURLString(this.URLString, true);
		}

		if (urlstring) {
			if (this.URLString.length) {
				this.URLString += this.argumentSeparator + urlstring;
			} else {
				this.URLString = urlstring;
			}
		}

		// prevents caching of URLString
		this.setVar("rndval", new Date().getTime());
		this.setVar('ajax', 'true');

		urlstringtemp = new Array();
		for (key in this.vars) {
			if (false == this.vars[key][1] && true == this.encodeURIString) {
				encoded = this.encVar(key, this.vars[key][0], true);
				delete this.vars[key];
				this.vars[encoded[0]] = Array(encoded[1], true);
				key = encoded[0];
			}

			urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
		}
		if (urlstring){
			this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
		} else {
			this.URLString += urlstringtemp.join(this.argumentSeparator);
		}
	}

	this.convertFormDataToPostContent = function(form_name) {
		var content_to_submit = '';
		var form_element;
		var last_element_name = '';
		form = document.getElementById(form_name);
		form_name = form;
		for (i = 0; i < form_name.elements.length; i++) {
			form_element = form_name.elements[i];
			form_element.value = form_element.value.replace(/[+]/g,"%2B");
			switch (form_element.type) {
				// Text fields, hidden form elements
				case 'text':
				case 'hidden':
				case 'password':
				case 'textarea':
				case 'submit':
				case 'button':
				case 'select-one':
					content_to_submit += form_element.name + '=' + encodeURIComponent(form_element.value) + '&';
				break;
				// Radio buttons
				case 'radio':
					if (form_element.checked) {
						content_to_submit += form_element.name + '=' + encodeURIComponent(form_element.value) + '&';
					}
				break;
				// Checkboxes
				case 'checkbox':
					if (form_element.checked) {
						// Continuing multiple, same-name checkboxes
						if (form_element.name == last_element_name) {
							// Strip of end ampersand if there is one
							if (content_to_submit.lastIndexOf('&') == content_to_submit.length - 1) {
								content_to_submit = content_to_submit.substr(0, content_to_submit.length - 1);
							}
							// Append value as comma-delimited string
							content_to_submit += ',' + encodeURIComponent(form_element.value);
						}
						else {
							content_to_submit += form_element.name + '=' + encodeURIComponent(form_element.value);
						}
						content_to_submit += '&';
						last_element_name = form_element.name;
					}
				break;
			}
		}
		// Remove trailing separator
		content_to_submit = content_to_submit.substr(0, content_to_submit.length - 1);
		return content_to_submit;
	}

	this.runResponse = function() {
		eval(self.response);
	}

	this.runAJAX = function(urlstring) {
		if (this.failed) {
			this.onFail();
		} else {
			this.createURLString(urlstring);
			if (this.element) {
				this.elementObj = document.getElementById(this.element);
			}
			if (this.xmlhttp) {
				var self = this;
				this.requestFile = this.webroot + this.requestFile;
				if (this.method == "GET") {
					totalurlstring = this.requestFile + this.queryStringSeparator + this.URLString;
					this.xmlhttp.open(this.method, totalurlstring, true);
				} else {
					this.xmlhttp.open(this.method, this.requestFile, true);
					try {
						this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
					} catch (e) { alert('Something went wrong with form processing'); }
				}

				this.xmlhttp.onreadystatechange = function() {
					switch (self.xmlhttp.readyState) {
						case 1:
							self.onLoading();
							break;
						case 2:
							self.onLoaded();
							break;
						case 3:
							self.onInteractive();
							break;
						case 4:
							self.response = self.xmlhttp.responseText;	
							self.responseXML = self.xmlhttp.responseXML;
							self.responseStatus[0] = self.xmlhttp.status;
							self.responseStatus[1] = self.xmlhttp.statusText;

							//if (self.execute) {
							//	self.runResponse();
							//}
							if(self.execJavascript) {
								eval(self.response);
							}

							if (self.elementObj) {
								elemNodeName = self.elementObj.nodeName;
								elemNodeName.toLowerCase();
								if (elemNodeName == "input"
								|| elemNodeName == "select"
								|| elemNodeName == "option"
								|| elemNodeName == "textarea") {
									self.elementObj.value = self.response;
								} else {
									self.elementObj.innerHTML = self.response;
									if(self.execute) {
										scripts = self.elementObj.getElementsByTagName('script');
										try {
											for(i = 0; scripts.length; i++) {
												if(scripts[i].innerHTML) {
													eval(scripts[i].innerHTML);
												}
											}
										}
										catch(e) { /*alert('CMS error: ' + e.toString());*/ }
									}
								}
							}
							if (self.responseStatus[0] == "200") {
								self.onCompletion();
							} else {
								self.onError();
							}

							self.URLString = "";
							break;
					}
				};
				this.xmlhttp.send(this.URLString);
			}
		}
	};

	this.reset();
	this.createAJAX();
}