function instantiateVNFFromForm(formId, dataPropName, resId) {
    // create empty json
    var jsonObj = JSON.parse("{}");
	var form = document.getElementById(formId);
    var groups = $(form).find('.form-group');
    for(var i in groups) {
        var gr = groups[i];
        var elem = $(gr).find('.form-control');
        var butt = $(gr).find('button');
        var prop = $(elem[0]).data(dataPropName);
        if (butt.length > 0) {
            var array = [];
            for (var j in elem) {
            	var el = elem[j];
                var v = el.value;
                if (v.length > 0) {
                    array.push(v);
                }
            }
            jsonObj[prop] = array;
        } else {
            var v = elem[0].value;
            jsonObj[prop] = v;
        }

    }
    // TO REMOVE with new VNFD
    jsonObj['flavour'] = 'dfTest';
    jsonObj['ns-id'] = ['ns_fake'];
	var json = JSON.stringify(jsonObj);
    console.log(json);
    postVNFInstanceRequest(json, resId,
			'VNF instantiate request have been sent',
			'Error while sending VNF instantiate request', showResultMessage);
}