var xmlHttp

// -------------------------------------------------------------------
// Central AJAX Call
// -------------------------------------------------------------------
function GetXmlHttpObject()
{
  var xmlHttp=null;
  try
  {
    // Firefox, Opera 8.0+, Safari
    xmlHttp=new XMLHttpRequest();
  }
  catch (e)
  {
    //Internet Explorer
    try
    {
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e)
    {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
  return xmlHttp;
}



// -------------------------------------------------------------------
// General Utilities
// -------------------------------------------------------------------  
// General trim of all white space in string
function trim_all(s)
{   
  var i;
  var returnString = "";
  // Search through string's characters one by one.
  // If character is not a whitespace, append to returnString.
  for (i = 0; i < s.length; i++)
  {   
      // Check that current character isn't whitespace.
      var c = s.charAt(i);
      if (c != " ") returnString += c;
  }
  return returnString;
}

// Specific trim of only whitespace (or specified char) at the end or beginning of a string.
// Parameters:
//   str:   string to trim (required).
//   chars: character to trim from string (optional. defaults to white space char). 
function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}

// Left trim only. 
function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

// Right trim only. 
function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

function hov(loc,cls) 
{ 
  if(loc.className) 
    loc.className=cls; 
} 

function isInt(x) 
{
  var y=parseInt(x);
  if (isNaN(y)) return false;
  return x==y && x.toString()==y.toString();
} 

function doClick(buttonName,e)
{
  //the purpose of this function is to allow the enter key to 
  //point to the correct button to click.
  var key;

  if (window.event)
  {
    key = window.event.keyCode;     //IE
  } 
  else 
  {
    key = e.which;     //firefox
  }

  if (key == 13)
  {
    //Get the button the user wants to have clicked
    var btn = document.getElementById(buttonName);
    if (btn != null)
    { //If we find the button click it

      btn.click();
      //e.keyCode = 0
      key = "";
    }
  }
}

function textCounter(field, countfield) 
{
  countfield.value = field.value.length;
} 
/*function textCounter(field, countfield, maxlimit) 
{
  if (field.value.length > maxlimit) // if too long...trim it!
      field.value = field.value.substring(0, maxlimit);
  // otherwise, update 'characters left' counter
  else 
     countfield.value = maxlimit - field.value.length;
} */

function convertPagerListForPost(textData)
{
    var result = "";

    // Convert multi-line pager text to be ':' separated list
    var lines = textData.split('\n');
    for (var i = 0;i < lines.length;i++)
    {   
        if (i > 0)
        {
            result += ":";
        }
        result += lines[i];
    }
    return encodeURI(result);
}

function submitRequest()
{
    clearFeedback();

    xmlHttp=GetXmlHttpObject()
    if (xmlHttp==null)
    {
        alert ("Browser does not support HTTP Request")
        return
    }

    if (checkform())
    {
        var passwd      = trim(document.getElementById("passwd").value);
        var pagerText   = document.getElementById("pagers").value;
        var pagers      = convertPagerListForPost(pagerText);
        var msgText     = document.getElementById("idmsg").value;
        var replyEmail  = trim(document.getElementById("email_reply").value);

        var url         = "http://www.xms.com.au/cgi-bin/xmhsweb_sms";
        var params      = "passwd=" + encodeURI(passwd) +
                          "&pagers=" + pagers +
                          "&msgText=" + encodeURI(msgText);
                          "&email_reply=" + encodeURI(replyEmail);
        if (replyEmail.length > 0) {
            params      = params + "&email_reply=" + encodeURI(replyEmail);
        }
        xmlHttp.open("POST", url, true);

        //Send the proper header information along with the request
        xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
        xmlHttp.onreadystatechange=handleRequestReply; 
        xmlHttp.send(params);

    }
}

function handleRequestReply()
{
    if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") 
    {
        // Parse reply text and determine whether message entry was successful
        var reply = xmlHttp.responseText;
        var success = (reply.indexOf("Message succesfully sent") > 1);

        // Notify user of success/fail
        var feedback = document.getElementById("messageFeedback");
        if (success)
        {
          feedback.innerHTML = 
            "<span class='entrySuccess'>" +
              reply +
            "</span>";
        }
        else
        {
          feedback.innerHTML = 
            "<span class='entryFailure'>" +
              reply +
            "</span>";
        } 
    }  
}

function checkform()
{
  var feedback = document.getElementById("messageFeedback");

  // Ensure that it is possible to provide feedback
  if (feedback == null)
  {
      alert("Error! Feedback element missing!");
      return false;
  }

  // Ensure password has been specified. 
  var txt = document.getElementById("passwd");
  if (txt != null)
  {
     if (txt.value == null || txt.value == "")
     {
        feedback.innerHTML = 
          "<span class='errormsg'>" +
             "You must enter your xms gateway password." +
          "</span>";
        return false;
     }
  } 
  
  // Ensure pager has been specified. 
  txt = document.getElementById("pagers");
  if (txt != null)
  {
     if (txt.value == null || txt.value == "")
     {
        feedback.innerHTML = 
          "<span class='errormsg'>" +
            "You must enter at least one pager/mobile number." +
          "</span>";
        return false;
     }
  } 
  
  // Ensure message has been specifed. 
  txt = document.getElementById("idmsg");
  if (txt != null)
  {
     if (txt.value == null || txt.value == "")
     {
        feedback.innerHTML = 
          "<span class='errormsg'>" +
            "You must enter a message." +
          "</span>";
        return false;
     }
  } 
  
  // Look for optional email address, and if present, ensure it's valid.
  txt = document.getElementById("email_reply");
  if (txt != null)
  {
     var emailTxt = trim(txt.value);
     if (emailTxt != null && emailTxt != "")
     {
        if (echeck(emailTxt) == false)
        {
          feedback.innerHTML = 
            "<span class='errormsg'>" +
             "The reply email is optional. But if entered, it must be a valid email address." +
            "</span>";
          return false;
        }
     }
  }   
    
  return true;
}

function echeck(str) 
{

  var at="@"
  var dot="."
  var lat=str.indexOf(at)
  var lstr=str.length
  var ldot=str.indexOf(dot)
  if (str.indexOf(at)==-1){
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
  {
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
  {
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(at,(lat+1))!=-1)
  {
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
  {
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(dot,(lat+2))==-1)
  {
    //alert("Invalid E-mail ID")
    return false
  }
  
  if (str.indexOf(" ")!=-1)
  {
    //alert("Invalid E-mail ID")
    return false
  }
  
  return true					
}

function clearFeedback()
{
  var feedback = document.getElementById("messageFeedback");

  // Ensure that it is possible to provide feedback
  if (feedback != null)
  {
    feedback.innerHTML = "";
  }
}