// Converts XML to JSON
function XMLtoJSON() {
var me = this; // stores the object instantce
// gets the content of an xml file and returns it in
me.fromFile = function(xml, rstr) {
// Cretes a instantce of XMLHttpRequest object
var xhttp = (window.XMLHttpRequest) ? new XMLHttpRequest()
: new ActiveXObject("Microsoft.XMLHTTP");
// sets and sends the request for calling "xml"
xhttp.open("GET", xml, false);
xhttp.send(null);
// gets the JSON string
var json_str = jsontoStr(setJsonObj(xhttp.responseXML));
// sets and returns the JSON object, if "rstr" undefined (not passed),
// else, returns JSON string
return (typeof (rstr) == 'undefined') ? JSON.parse(json_str) : json_str;
}
// returns XML DOM from string with xml content
me.fromStr = function(xml, rstr) {
// for non IE browsers
if (window.DOMParser) {
var getxml = new DOMParser();
var xmlDoc = getxml.parseFromString(xml, "text/xml");
} else {
// for Internet Explorer
var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async = "false";
}
// gets the JSON string
var json_str = jsontoStr(setJsonObj(xmlDoc));
// sets and returns the JSON object, if "rstr" undefined (not passed),
// else, returns JSON string
return (typeof (rstr) == 'undefined') ? JSON.parse(json_str) : json_str;
}
// receives XML DOM object, returns converted JSON object
var setJsonObj = function(xml) {
var js_obj = {};
if (xml.nodeType == 1) {
if (xml.attributes.length > 0) {
js_obj["@attributes"] = {};
for ( var j = 0; j < xml.attributes.length; j++) {
var attribute = xml.attributes.item(j);
js_obj["@attributes"][attribute.nodeName] = attribute.value;
}
}
} else if (xml.nodeType == 3) {
js_obj = xml.nodeValue;
}
if (xml.hasChildNodes()) {
for ( var i = 0; i < xml.childNodes.length; i++) {
var item = xml.childNodes.item(i);
var nodeName = item.nodeName;
if (typeof (js_obj[nodeName]) == "undefined") {
js_obj[nodeName] = setJsonObj(item);
} else {
if (typeof (js_obj[nodeName].push) == "undefined") {
var old = js_obj[nodeName];
js_obj[nodeName] = [];
js_obj[nodeName].push(old);
}
js_obj[nodeName].push(setJsonObj(item));
}
}
}
return js_obj;
}
// converts JSON object to string (human readablle).
// Removes ' \r\n', rows with multiples '""', multiple empty rows, ' "",',
// and " ",; replace empty [] with ""
var jsontoStr = function(js_obj) {
var rejsn = JSON.stringify(js_obj, undefined, 2).replace(
/(\ |\\r|\\n)/g, '').replace(/"",[\n \r\s]+""[,]*/g, '')
.replace(/(\n[ \s\r]*\n)/g, '').replace(
/[\s ]{2,}""[,]{0,1}/g, '').replace(
/"[\s ]{1,}"[,]{0,1}/g, '').replace(/\[[ \s]*\]/g,
'""');
return (rejsn.indexOf('"parsererror": {') == -1) ? rejsn
: 'Invalid XML format';
}
};
// creates object instantce of XMLtoJSON
var xml2json = new XMLtoJSON();
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