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   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  
   7  function 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  }