var domSupported = (document.getElementsByTagName &&
                    document.createElement);
window.onload = function () {
    if (domSupported) {
        document.getElementById("genForm").onsubmit = function() {
            return generate();
        }
    }
}
 
function generate() {
    var ok = validate();
    if (ok) {
        var doc = buildDOM();
        var str = xmlToString(doc);
 
        // ie removes encoding from XML declaration
        str = fixEncoding(str);
 
        document.getElementById("xmldata").value = str;
        return true;
    } else {
        return false;
    }
}
 
function validate() {
    if (isErrorListCreated()) {
        removeErrorList()
    }
 
    var pattern = /[^\x00-\x21\x23-\x25\x28-\x3b\x3d-\x3d\x3f-\x7f]/;
    check("OrgnlMsgId", 35, pattern, true, "Original message identification");
    check("BkPtyId", 35, pattern, true, "Bank party identification");
    check("OrgnlPmtInfId", 35, pattern, true, "Original payment information identification");
    check("OrgnlEndToEndId", 35, pattern, false, "Original end to end identification");
    check("OrgnlInstrId", 35, pattern, false, "Original instruction identification");
 
    if (document.getElementById("OrgnlInstrId").value.length > 0 &&
           document.getElementById("OrgnlEndToEndId").value.length == 0) {
       addError("Original end to end identification is required when " +
                " an original instruction identification is specified");
    }
 
    return isErrorListCreated() == false;
}
 
function check(id, maxLength, pattern, mandatory, name) {
    var e = document.getElementById(id);
    var value = e.value;
 
    if (mandatory && value.length == 0) {
        addError(name + " is a required field");
        return; // were done
    }
 
    if (value.length > maxLength){
        addError(name + " too long");
    }
 
    if (pattern.test(value)) {
        addError(name + " contains special characters");
    }
}
 
function isErrorListCreated() {
    return document.getElementById("errors") != null;
}
 
function removeErrorList() {
    var list = document.getElementById("errors");
    var parent = list.parentNode;
    parent.removeChild(list);
}
 
function createErrorList() {
    // create div
    var div = document.createElement("div");
    div.setAttribute("id", "errors");
 
    // create list
    var list = document.createElement("ul");
    list.setAttribute("id", "errorList");
    div.appendChild(list);
 
    // insert div
    var formDiv = document.getElementById("genForm");
    var parent = formDiv.parentNode;
    parent.insertBefore(div, formDiv);
}
 
function addError(message) {
    if (!isErrorListCreated()) {
         createErrorList();
    }
 
    // create new list item
    var item = document.createElement("li");
    item.appendChild(document.createTextNode(message));
 
    var list = document.getElementById("errorList");
    list.appendChild(item);
}
 
function buildDOM() {
    // get template
    var doc = getTemplate();
 
    // add values
    var ts = toISODateString(new Date());
    setValue(doc, "MsgId", "NDEA " + ts);
    setValue(doc, "CreDtTm", ts);
    setValueFromTextField(doc, "OrgnlMsgId", "OrgnlMsgId");
    setValueFromTextField(doc, "BkPtyId", "BkPtyId");
    setValueFromTextField(doc, "OrgnlPmtInfId", "OrgnlPmtInfId");
    setValueFromTextField(doc, "OrgnlInstrId", "OrgnlInstrId");
    setValueFromTextField(doc, "OrgnlEndToEndId", "OrgnlEndToEndId");
 
    return doc;
}
 
function xmlToString(node) {
   try {
      // Gecko- and Webkit-based browsers (Firefox, Chrome), Opera.
      return (new XMLSerializer()).serializeToString(node);
  }
  catch (e) {
     try {
        // Internet Explorer.
        return node.xml;
     }
     catch (e) {
        //Other browsers without XML Serializer
        alert('Xmlserializer not supported');
     }
   }
   return null;
}
 
function fixEncoding(str) {
    var patt = /<\?xml\s*version="1.0"\s*\?>/;
    var enc ="<?xml version=\"1.0\" encoding=\"UTF-8\" ?>";
    return str.replace(patt, enc);
}
 
function getTemplate() {
    var xmlhttp = createXMLHttpRequest();
    xmlhttp.open("GET","/ku/bin/pain006x.xml",false);
    xmlhttp.send();
    return xmlhttp.responseXML;
}
 
function createXMLHttpRequest() {
    if (window.XMLHttpRequest) {
        // IE7+, Firefox, Chrome, Opera, Safari
        return new XMLHttpRequest();
    } else {
        // code for IE6, IE5
        return new ActiveXObject("Microsoft.XMLHTTP");
    }
}
 
function setValue(doc, tagName, value) {
    var node = doc.getElementsByTagName(tagName)[0];
 
    if (value.length > 0) {
        node.childNodes[0].nodeValue = value;
    } else {
        var parent = node.parentNode;
        parent.removeChild(node);
    }
}
 
function setValueFromTextField(doc, tagName, id) {
    var value = document.getElementById(id).value;
    setValue(doc, tagName, value);
}
 
function toISODateString(d) {
    function pad(n){
        return n < 10 ? '0' + n : n
    }
    return d.getUTCFullYear()+'-'
    + pad(d.getUTCMonth()+1)+'-'
    + pad(d.getUTCDate())+'T'
    + pad(d.getUTCHours())+':'
    + pad(d.getUTCMinutes())+':'
    + pad(d.getUTCSeconds())+'Z'
}
 
function escapeXMLChars(str) {
    var clean = str;
    clean = clean.replace(/&/g, '&amp;');
    clean = clean.replace(/</g, '&lt;');
    clean = clean.replace(/>/g, '&gt;');
    clean = clean.replace(/'/g, '&apos;');
    clean = clean.replace(/"/g, '&quot;');
 
    return clean;
}
 
function trim(str) {
    return leftTrim(rightTrim(str));
}
function leftTrim(str) {
    if (str.indexOf(" ") == 0) {
        for (var i = 0; i < str.length; i++) {
            if (str.charAt(i) != ' ') {
                return str.substring(i);
            }
        }
        return "";
    }
 
    return str;
}
function rightTrim(str) {
    if (str.lastIndexOf(" ") == str.length - 1) {
        for (var i = str.length - 1; i >= 0 ; i--) {
            if (str.charAt(i) != ' ') {
                return str.substring(0, i + 1);
            }
        }
        return "";
    }
    return str;
}