/**
 * Validiert ein Feld in einer Form als positive Ganzzahl
 **/
function validateInputAsUnsignedInt(inputElement) {
  var newValue = parseInt(inputElement.value);
  if(isNaN(newValue))
    newValue = 0;
  if(newValue < 0)
    newValue = 0;

  inputElement.value = newValue;
}


/*
    Developed by Robert Nyman, http://www.robertnyman.com
    Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/
var getElementsByClassName = function (className, tag, elm){
    if (document.getElementsByClassName) {
        getElementsByClassName = function (className, tag, elm) {
            elm = elm || document;
            var elements = elm.getElementsByClassName(className),
                nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
                returnElements = [],
                current;
            for(var i=0, il=elements.length; i<il; i+=1){
                current = elements[i];
                if(!nodeName || nodeName.test(current.nodeName)) {
                    returnElements.push(current);
                }
            }
            return returnElements;
        };
    }
    else if (document.evaluate) {
        getElementsByClassName = function (className, tag, elm) {
            tag = tag || "*";
            elm = elm || document;
            var classes = className.split(" "),
                classesToCheck = "",
                xhtmlNamespace = "http://www.w3.org/1999/xhtml",
                namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
                returnElements = [],
                elements,
                node;
            for(var j=0, jl=classes.length; j<jl; j+=1){
                classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
            }
            try {
                elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
            }
            catch (e) {
                elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
            }
            while ((node = elements.iterateNext())) {
                returnElements.push(node);
            }
            return returnElements;
        };
    }
    else {
        getElementsByClassName = function (className, tag, elm) {
            tag = tag || "*";
            elm = elm || document;
            var classes = className.split(" "),
                classesToCheck = [],
                elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
                current,
                returnElements = [],
                match;
            for(var k=0, kl=classes.length; k<kl; k+=1){
                classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
            }
            for(var l=0, ll=elements.length; l<ll; l+=1){
                current = elements[l];
                match = false;
                for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
                    match = classesToCheck[m].test(current.className);
                    if (!match) {
                        break;
                    }
                }
                if (match) {
                    returnElements.push(current);
                }
            }
            return returnElements;
        };
    }
    return getElementsByClassName(className, tag, elm);
};



function validateYearTo4Digits(inputElement) {
  var newValue = parseInt(inputElement.value, 10);
  if(isNaN(newValue) || newValue < 0) {
	if(inputElement.value != '')
	  alert('Ablaufjahr unzulässig');
	inputElement.value = '';
    return;
  }
  
  if(inputElement.value.length <= 2)
    newValue += 2000;

  if(inputElement.value > 3000) {
    inputElement.value = '';
	alert('Ablaufjahr unzulässig');
	return;
  }
  inputElement.value = newValue;
}

function displayErrorOnWrongLength(maxLength, inputElement, errorElement) {
  if ((inputElement.value.length + lineBreakCount(inputElement.value)) > maxLength)
	errorElement.style.display = '';
  else
    errorElement.style.display = 'none';
}

function lineBreakCount(str){
  /* counts \n */
  try {
      return((str.match(/[^\n]*\n[^\n]*/gi).length));
  } catch(e) {
      return 0;
  }
}




var elementVisibilityByOptionField = new Array();
function initElementVisibilityByOptionField() {
  for (i in elementVisibilityByOptionField) {
    element = document.getElementById(elementVisibilityByOptionField[i]);
    if(element) {
      element.style.display = 'none';
      //element.style.border="1px solid red";
    }
  }
}
function toggleElementVisibilityByOptionField(activeElementId) {
  //alert(elementVisibilityByOptionField);
  for (i in elementVisibilityByOptionField) {
    element = document.getElementById(elementVisibilityByOptionField[i]);
    if(element) {
      if(activeElementId == element.id)
        element.style.display = '';
      else
        element.style.display = 'none';
      //element.style.border="1px solid red";
    }
  }
}






function toogleElementVisibilityByCheckbox(objCheckbox, elementId, checkedMeansVisible) {
  if(objCheckbox.checked == checkedMeansVisible)
    document.getElementById(elementId).style.display = '';
  else
	document.getElementById(elementId).style.display = 'none';
}

function redirectToValue(element) {
  var value = element.value;
  if(value != '') {
    //element.options[element.selectedIndex].text =  'Sie werden weitergeleitet...';
    //element.disabled = true;
    window.location.href = value;
  }
}

var item = null;
function toggleElementVisibility(elementId) {
  if(document.getElementById(elementId).style.display == 'none') {
    hideItem();
    showItem(elementId);
  } else {
    hideItem();
  }
}

function showItem(id) {
  item = document.getElementById(id);
  if (item != null) {
    item.style.display = '';
  }
}
function hideItem() {
  if (item != null) {
    item.style.display = 'none';
  }
}

function updateItemsTotal(orderMaskId) {
  inputElements = getElementsByClassName('inputItemCountToCart','input',document.getElementById(orderMaskId));
  itemCount = parseInt(0);
  if(inputElements.length > 0) {
    for(i = 0 ; i < inputElements.length; i++) {
      validateInputAsUnsignedInt(inputElements[i]);
      itemCount += parseInt(inputElements[i].value);
    }
  }
  itemsTotal = getElementsByClassName('itemsTotal','span',document.getElementById(orderMaskId));
  itemsTotal[0].innerHTML = itemCount;
}

function updatePriceDivTotal(orderMaskId) {
  inputElements = getElementsByClassName('inputItemCountToCart','input',document.getElementById(orderMaskId));
  priceParagraphs = getElementsByClassName('price','p',document.getElementById(orderMaskId));
  priceTotal = parseFloat(0);
  if(inputElements.length > 0 && priceParagraphs.length > 0) {
    for(i = 0 ; i < priceParagraphs.length; i++) {
      priceArr = priceParagraphs[i].innerHTML.split(',');
      priceTotal += parseFloat(parseFloat(priceArr[0]+'.'+priceArr[1]) * parseFloat(inputElements[i].value));
    }
  }
  priceDivTotal = getElementsByClassName('priceDivTotal','span',document.getElementById(orderMaskId));
  priceTotalArr = String(priceTotal.toFixed(2)).split('.');
  priceDivTotal[0].innerHTML = priceTotalArr[0] + ',' + priceTotalArr[1] + '&euro;';
}

function startBackgroundTask(url) {
  var http_request = false;
  if (window.XMLHttpRequest) { // Mozilla, Safari, ...
    http_request = new XMLHttpRequest();
  } else if (window.ActiveXObject) { // IE
    http_request = new ActiveXObject("Microsoft.XMLHTTP");
  }
 
  http_request.onreadystatechange = function() {
    if (http_request.readyState == 4) {
      if (http_request.status == 200) {
        var rData = http_request.responseText;
      } else {}
    }
  };

  //Request starten
  http_request.open('GET', url, true);
  http_request.send(null);  
}