lib/scripts/tw-sack.js

   1 /* Simple AJAX Code-Kit (SACK) */
   2 /* ©2005 Gregory Wild-Smith */
   3 /* www.twilightuniverse.com */
   4 /* Software licenced under a modified X11 licence, see documentation or authors website for more details */
   5
   6 function sack(file){
   7   this.AjaxFailedAlert = "Your browser does not support the enhanced functionality of this website, and therefore you will have an experience that differs from the intended one.\n";
   8   this.requestFile = file;
   9   this.method = "POST";
  10   this.URLString = "";
  11   this.encodeURIString = true;
  12   this.execute = false;
  13
  14   this.onLoading = function() { };
  15   this.onLoaded = function() { };
  16   this.onInteractive = function() { };
  17   this.onCompletion = function() { };
  18   this.afterCompletion = function() { };
  19
  20   this.createAJAX = function() {
  21     try {
  22       this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  23     } catch (e) {
  24       try {
  25         this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  26       } catch (err) {
  27         this.xmlhttp = null;
  28       }
  29     }
  30     if(!this.xmlhttp && typeof XMLHttpRequest != "undefined"){
  31       this.xmlhttp = new XMLHttpRequest();
  32     }
  33     if (!this.xmlhttp){
  34       this.failed = true;
  35     }
  36   };
  37
  38   this.setVar = function(name, value){
  39     if (this.URLString.length < 3){
  40       this.URLString = name + "=" + value;
  41     } else {
  42       this.URLString += "&" + name + "=" + value;
  43     }
  44   };
  45
  46   this.encVar = function(name, value){
  47     var varString = encodeURIComponent(name) + "=" + encodeURIComponent(value);
  48   return varString;
  49   };
  50
  51   this.encodeURLString = function(string){
  52     varArray = string.split('&');
  53     for (i = 0; i < varArray.length; i++){
  54       urlVars = varArray[i].split('=');
  55       if (urlVars[0].indexOf('amp;') != -1){
  56         urlVars[0] = urlVars[0].substring(4);
  57       }
  58       varArray[i] = this.encVar(urlVars[0],urlVars[1]);
  59     }
  60   return varArray.join('&');
  61   };
  62
  63   this.runResponse = function(){
  64     eval(this.response);
  65   };
  66
  67   this.runAJAX = function(urlstring){
  68     this.responseStatus = new Array(2);
  69     if(this.failed && this.AjaxFailedAlert){
  70       alert(this.AjaxFailedAlert);
  71     } else {
  72       if (urlstring){
  73         if (this.URLString.length){
  74           this.URLString = this.URLString + "&" + urlstring;
  75         } else {
  76           this.URLString = urlstring;
  77         }
  78       }
  79       if (this.encodeURIString){
  80         var timeval = new Date().getTime();
  81         this.URLString = this.encodeURLString(this.URLString);
  82         this.setVar("rndval", timeval);
  83       }
  84       if (this.element) { this.elementObj = document.getElementById(this.element); }
  85       if (this.xmlhttp) {
  86         var self = this;
  87         if (this.method == "GET") {
  88           var totalurlstring = this.requestFile + "?" + this.URLString;
  89           this.xmlhttp.open(this.method, totalurlstring, true);
  90         } else {
  91           this.xmlhttp.open(this.method, this.requestFile, true);
  92         }
  93         if (this.method == "POST"){
  94           try {
  95              this.xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=UTF-8');
  96           } catch (e) {}
  97         }
  98
  99         this.xmlhttp.onreadystatechange = function() {
 100           switch (self.xmlhttp.readyState){
 101             case 1:
 102               self.onLoading();
 103             break;
 104             case 2:
 105               self.onLoaded();
 106             break;
 107             case 3:
 108               self.onInteractive();
 109             break;
 110             case 4:
 111               self.response = self.xmlhttp.responseText;
 112               self.responseXML = self.xmlhttp.responseXML;
 113               self.responseStatus[0] = self.xmlhttp.status;
 114               self.responseStatus[1] = self.xmlhttp.statusText;
 115               self.onCompletion();
 116               if(self.execute){ self.runResponse(); }
 117               if (self.elementObj) {
 118                 var elemNodeName = self.elementObj.nodeName;
 119                 elemNodeName.toLowerCase();
 120                 if (elemNodeName == "input" || elemNodeName == "select" || elemNodeName == "option" || elemNodeName == "textarea"){
 121                   self.elementObj.value = self.response;
 122                 } else {
 123                   self.elementObj.innerHTML = self.response;
 124                 }
 125               }
 126               self.afterCompletion();
 127               self.URLString = "";
 128             break;
 129           }
 130         };
 131         this.xmlhttp.send(this.URLString);
 132       }
 133     }
 134   };
 135 this.createAJAX();
 136 }