/*---------------------------------------------------------------------------------------------
	project:    kalpaitch.com
    version:	2.0
	created:    03.10.2010
    author:     andrew hughes-onslow
	copyright:	n/a
	
	contents:	function - testPostCode - check for a valid UK postcode
				function - charCount - Count and limit the number of characters entered into a textarea
				function - printit - simple print function
				function - clearInput - clear form input area on click
				function - fieldBlack - transform all inputs colour when value is not the default value
				AJAX - response text

				AJAX - XMLHttpRequest
*/

/*---------------------------------------------------------------------------------------------
end document load
---------------------------------------------------------------------------------------------*/

/* --------------------------------------postcode checker---------------------------------------- */
var geocoder;
function codeAddress(address) {
	geocoder = new google.maps.Geocoder();
	geocoder.geocode( { 'address': address, 'region': 'uk' }, function(results, status) {
	  if (status == google.maps.GeocoderStatus.OK) {
		var location = results[0].geometry.location;
		return location;
	  }
	});
}

/* --------------------------------------postcode checker---------------------------------------- */
function testPostCode(){
	var myPostCode = document.getElementById('event_postcode').value;
	if (checkPostCode(myPostCode)) {
		document.getElementById('postcode').value = checkPostCode (myPostCode)
		return true;
	} 
	else {
		return false;
	}
}

function checkPostCode (toCheck) {
  // Permitted letters depend upon their position in the postcode. Rules grabbed from Royal Mail 
  var alpha1 = "[abcdefghijklmnoprstuwyz]";                       // Character 1
  var alpha2 = "[abcdefghklmnopqrstuvwxy]";                       // Character 2
  var alpha3 = "[abcdefghjkpmnrstuvwxy]";                         // Character 3
  var alpha4 = "[abehmnprvwxy]";                                  // Character 4
  var alpha5 = "[abdefghjlnpqrstuwxyz]";                          // Character 5
  
  // Array holds the regular expressions for the valid postcodes
  var pcexp = new Array ();
  // Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1,2})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  // Expression for postcodes: ANA NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}[0-9]{1}" + alpha3 + "{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  // Expression for postcodes: AANA  NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "{1}" + "?[0-9]{1}" + alpha4 +"{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  // Exception for the special postcode GIR 0AA
  pcexp.push (/^(GIR)(\s*)(0AA)$/i);
  // Standard BFPO numbers
  pcexp.push (/^(bfpo)(\s*)([0-9]{1,4})$/i);
  // c/o BFPO numbers
  pcexp.push (/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);
  // Overseas Territories
  pcexp.push (/^([A-Z]{4})(\s*)(1ZZ)$/i);
  // Load up the string to check
  var postCode = toCheck;
  // Assume we're not going to find a valid postcode
  var valid = false;
  // Check the string against the types of post codes
  for ( var i=0; i<pcexp.length; i++) {
    if (pcexp[i].test(postCode)) {
      // The post code is valid - split the post code into component parts
      pcexp[i].exec(postCode);
      // Copy it back into the original string, converting it to uppercase and inserting a space between the inward and outward codes
      postCode = RegExp.$1.toUpperCase() + " " + RegExp.$3.toUpperCase();
      // If it is a BFPO c/o type postcode, tidy up the "c/o" part
      postCode = postCode.replace (/C\/O\s*/,"c/o ");
      // Load new postcode back into the form element
      valid = true;
      // Remember that we have found that the code is valid and break from loop
      break;
    }
  }
  // Return with either the reformatted valid postcode or the original invalid postcode
  if (valid) {return postCode;} else return false;
}

/* -------------------------------------twitter character count---------------------------------------- */
function charCount(content, counter, max_length, warning_limit) {
	var text = $(content).val();
	var numofchars = text.length;
	var chars_left = max_length - numofchars;

	if(chars_left <= warning_limit) {
		$("#"+counter).html("").html(chars_left).css("color", "#BA002B");
	} else if(chars_left < max_length) {
		$("#"+counter).html("").html(chars_left).css("color", "#FF1C9F");
	} 
	if(chars_left < 0){
		$(content).val(text.substring(0, max_length));
	}
}

/* ---------------------------------------------print page----------------------------------------------- */
function printit(){  
	if (window.print) {
		window.print() ;  
	} else {
		var WebBrowser = '<object id="WebBrowser1" width=0 height=0 classid="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2"></object>';
	document.body.insertAdjacentHTML('beforeEnd', WebBrowser);
		WebBrowser1.ExecWB(6, 2);//Use a 1 vs. a 2 for a prompting dialog box    WebBrowser1.outerHTML = "";  
	}
}

/* ----------------------------------------------clear input----------------------------------------------- */

function clearInput(field){
	if (field.defaultValue == field.value){
		field.value = '';
		field.style.color = '#AAAAAA';
	}
    else if (field.value == ''){
		field.value = field.defaultValue;
		field.style.color = '#AAAAAA';
	}
}
function fieldBlack(field){
	if (field.value != '' && field.defaultValue != field.value){
		field.style.color = 'black';
	}
}

/* ----------------------------------------XMLHttpRequest response----------------------------------------- */
var xmlhttpImg;

function regView(variable){
xmlhttpImg=GetXmlHttpObject();
if (xmlhttpImg==null){
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="../PHP/viewedThread.php?viewedURLID="+varible+"&sid="+Math.random();
xmlhttp.onreadystatechange=stateChanged;
xmlhttpImg.open("GET",url,true);
xmlhttpImg.send(null);
}
function stateChanged(){
if (xmlhttp.readyState==4){
document.getElementById("coolBeans").innerHTML="cool beans";
}}


/* ---------------------------------------------XMLHttpRequest---------------------------------------------- */
function GetXmlHttpObject(){
if (window.XMLHttpRequest){
  // for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject){
  // for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}