/*
* ajax - Kaérea Asynchronous JavaScript And XML
* Marcio Ghiraldelli / André Cupini
* 20/04/2006
*/

function getE(el) {
  return document.getElementById(el);
}

// Tenta criar objeto xmlHTTP
try {
  xmlhttp = new XMLHttpRequest();
} catch(e) {
  try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch(e) {
    try {
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch(e) {
      xmlhttp = false;
    }
  }
}

// Pilha de conexões
pilha=[];
ipilha=0;

function asHTML(idObj, url) {
	ajaxSendRequest(idObj, url, null, null);
}

function asForm(idObj, url, form) {
	ajaxSendRequest(idObj, url, form, null);
}

function asXML(callback, url, form) {
	ajaxSendRequest(null, url, form, callback);
}

function ajaxSendRequest(idObj, url, form, callback){
  if (getE('divLoading')) {
	  getE('divLoading').style.display = 'block';
  }
  var delimiter;
  if (url.indexOf("?") > 0) {
    delimiter = "&";
  } else {
    delimiter = "?";
  }
  url = url + delimiter + "ajaxRand=" + Math.floor(Math.random()*9999);
  pilha[pilha.length] = [idObj, url, form, callback];
  if ( (ipilha + 1) == pilha.length ) {
    ajaxRun();
  }
}


function ajaxRun(){
  var idObj = pilha[ipilha][0];
  var url = pilha[ipilha][1];
  var form = pilha[ipilha][2];
  var callback = pilha[ipilha][3];
  var method = "GET";
  if (form != null) {
    method = "POST";
  }
  xmlhttp.open(method, url, true);
  var formData = "";
  var boundary;

  if (form != null) {
    boundary = "---------------------------"+ Math.floor(Math.random()*99999999999999);
    formData = generateMultiPart(form, boundary);
    xmlhttp.setRequestHeader('Content-Type', 'multipart/form-data; boundary=' + boundary);
  }
  xmlhttp.send(formData);
  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4){
      if (getE(idObj)) {
        retornoHTML = unescape(xmlhttp.responseText.replace(/\+/g, " "));
        getE(idObj).innerHTML = retornoHTML;
      }
      if (callback) {
        if (! xmlhttp.responseXML || ! xmlhttp.responseXML.documentElement) {
          alert(xmlhttp.responseText);
        } else {
          eval(callback + "(xmlhttp.responseXML)");
        }
      }
      ipilha++
      if (ipilha < pilha.length) {
        setTimeout('ajaxRun()', 20);
      } else {
        if (getE('divLoading')) {
          getE('divLoading').style.display = 'none'
        }
  	  }
    }
  }
}

function generateMultiPart(frm, boundary) {
  var formData = "";
  var cDisposition = 'Content-Disposition: form-data; name="';
  for(i = 0; i < frm.elements.length; i++){
    var e = frm.elements;
    if (e[i].name) {
      if (e[i].type == "text" || e[i].type == "textarea" || e[i].type == "button" || e[i].type == "hidden") {
        formData += '--' + boundary + '\r\n' + cDisposition + e[i].name +'"\r\n\r\n' + e[i].value + "\r\n";
      } else if (e[i].type == "select-one") {
        formData += '--' + boundary + '\r\n' + cDisposition + e[i].name +'"\r\n\r\n' + e[i].options[e[i].selectedIndex].value + "\r\n";
      } else if (e[i].type == "radio") {
        if (e[i].checked == true) {
          formData += '--' + boundary + '\r\n' + cDisposition + e[i].name +'"\r\n\r\n' + e[i].value + "\r\n";
        }
      } else if (e[i].type == "select-multiple") {
        for  (j = 0; j < e[i].length; j++) {
          if (e[i][j].selected) {
            formData += '--' + boundary + '\r\n' + cDisposition + e[i].name +'"\r\n\r\n' + e[i][j].value + "\r\n";
          }
        }
      } else if (e[i].type == "checkbox") {
        if (e[i].checked) {
          formData += '--' + boundary + '\r\n' + cDisposition + e[i].name +'"\r\n\r\n' + e[i].value + "\r\n";
        }
      }
    }
  }
  formData += "--" + boundary + "--\r\n";
  return formData;
}