1/* Simple AJAX Code-Kit (SACK) v1.6.1 */
  2/* ©2005 Gregory Wild-Smith */
  3/* www.twilightuniverse.com */
  4/* Software licenced under a modified X11 licence,
  5   see documentation or authors website for more details */
  6
  7function sack(file) {
  8	this.xmlhttp = null;
  9
 10	this.resetData = function() {
 11		this.method = "POST";
 12  		this.queryStringSeparator = "?";
 13		this.argumentSeparator = "&";
 14		this.URLString = "";
 15		this.encodeURIString = true;
 16  		this.execute = false;
 17  		this.element = null;
 18		this.elementObj = null;
 19		this.requestFile = file;
 20		this.vars = new Object();
 21		this.responseStatus = new Array(2);
 22  	};
 23
 24	this.resetFunctions = function() {
 25  		this.onLoading = function() { };
 26  		this.onLoaded = function() { };
 27  		this.onInteractive = function() { };
 28  		this.onCompletion = function() { };
 29  		this.onError = function() { };
 30		this.onFail = function() { };
 31	};
 32
 33	this.reset = function() {
 34		this.resetFunctions();
 35		this.resetData();
 36	};
 37
 38	this.createAJAX = function() {
 39		try {
 40			this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
 41		} catch (e1) {
 42			try {
 43				this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
 44			} catch (e2) {
 45				this.xmlhttp = null;
 46			}
 47		}
 48
 49		if (! this.xmlhttp) {
 50			if (typeof XMLHttpRequest != "undefined") {
 51				this.xmlhttp = new XMLHttpRequest();
 52			} else {
 53				this.failed = true;
 54			}
 55		}
 56	};
 57
 58	this.setVar = function(name, value){
 59		this.vars[name] = Array(value, false);
 60	};
 61
 62	this.encVar = function(name, value, returnvars) {
 63		if (true == returnvars) {
 64			return Array(encodeURIComponent(name), encodeURIComponent(value));
 65		} else {
 66			this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
 67		}
 68	}
 69
 70	this.processURLString = function(string, encode) {
 71		encoded = encodeURIComponent(this.argumentSeparator);
 72		regexp = new RegExp(this.argumentSeparator + "|" + encoded);
 73		varArray = string.split(regexp);
 74		for (i = 0; i < varArray.length; i++){
 75			urlVars = varArray[i].split("=");
 76			if (true == encode){
 77				this.encVar(urlVars[0], urlVars[1]);
 78			} else {
 79				this.setVar(urlVars[0], urlVars[1]);
 80			}
 81		}
 82	}
 83
 84	this.createURLString = function(urlstring) {
 85		if (this.encodeURIString && this.URLString.length) {
 86			this.processURLString(this.URLString, true);
 87		}
 88
 89		if (urlstring) {
 90			if (this.URLString.length) {
 91				this.URLString += this.argumentSeparator + urlstring;
 92			} else {
 93				this.URLString = urlstring;
 94			}
 95		}
 96
 97		// prevents caching of URLString
 98		this.setVar("rndval", new Date().getTime());
 99
100		urlstringtemp = new Array();
101		for (key in this.vars) {
102			if (false == this.vars[key][1] && true == this.encodeURIString) {
103				encoded = this.encVar(key, this.vars[key][0], true);
104				delete this.vars[key];
105				this.vars[encoded[0]] = Array(encoded[1], true);
106				key = encoded[0];
107			}
108
109			urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
110		}
111		if (urlstring){
112			this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
113		} else {
114			this.URLString += urlstringtemp.join(this.argumentSeparator);
115		}
116	}
117
118	this.runResponse = function() {
119		eval(this.response);
120	}
121
122	this.runAJAX = function(urlstring) {
123		if (this.failed) {
124			this.onFail();
125		} else {
126			this.createURLString(urlstring);
127			if (this.element) {
128				this.elementObj = document.getElementById(this.element);
129			}
130			if (this.xmlhttp) {
131				var self = this;
132				if (this.method == "GET") {
133					totalurlstring = this.requestFile + this.queryStringSeparator + this.URLString;
134					this.xmlhttp.open(this.method, totalurlstring, true);
135				} else {
136					this.xmlhttp.open(this.method, this.requestFile, true);
137					try {
138						this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
139					} catch (e) { }
140				}
141
142				this.xmlhttp.onreadystatechange = function() {
143					switch (self.xmlhttp.readyState) {
144						case 1:
145							self.onLoading();
146							break;
147						case 2:
148							self.onLoaded();
149							break;
150						case 3:
151							self.onInteractive();
152							break;
153						case 4:
154							self.response = self.xmlhttp.responseText;
155							self.responseXML = self.xmlhttp.responseXML;
156							self.responseStatus[0] = self.xmlhttp.status;
157							self.responseStatus[1] = self.xmlhttp.statusText;
158
159							if (self.execute) {
160								self.runResponse();
161							}
162
163							if (self.elementObj) {
164								elemNodeName = self.elementObj.nodeName;
165								elemNodeName.toLowerCase();
166								if (elemNodeName == "input"
167								|| elemNodeName == "select"
168								|| elemNodeName == "option"
169								|| elemNodeName == "textarea") {
170									self.elementObj.value = self.response;
171								} else {
172									self.elementObj.innerHTML = self.response;
173								}
174							}
175							if (self.responseStatus[0] == "200") {
176								self.onCompletion();
177							} else {
178								self.onError();
179							}
180
181							self.URLString = "";
182							break;
183					}
184				};
185
186				this.xmlhttp.send(this.URLString);
187			}
188		}
189	};
190
191	this.reset();
192	this.createAJAX();
193}
194