function createIoListItem () {
    var clientContext = new SP.ClientContext('https://microsoft.sharepoint.com/teams/TrainingSite');
    var oList = clientContext.get_web().get_lists().getByTitle('Budget');
    var itemCreateInfo = new SP.ListItemCreationInformation();
    this.oListItem = oList.addItem(itemCreateInfo);
   	var popupFields = document.querySelectorAll('#popupOverlay tr:not(:first-child):not(:last-child) select,#popupOverlay tr:not(:first-child):not(:last-child) input');
	oListItem.set_item('ClassID', document.getElementById('ctl00_ctl30_g_4f409266_9442_421f_b8cd_0220ded31ba5_ff21_ctl00_ctl00_TextField').value);
	oListItem.set_item('Sum', popupFields[0].value);
    oListItem.update();
    clientContext.load(oListItem);
    clientContext.executeQueryAsync(
        Function.createDelegate(this, this.ioCreateOnQuerySucceeded),
        Function.createDelegate(this, this.ioCreateOnQueryFailed)
    );
}