http://docs.webix.com/helpers__ajax_operations.html documents “For async ajax calls, last parameter of method is a callback function”:
webix.ajax("some.php", function(text, xml, XmlHttpRequest){
// text - full text of response
// xml - response parsed as xml , if applicable
// XmlHttpRequest - loader object
});
Actually the second parameter can be JSON, so the documentation should be:
webix.ajax("some.php", function(text, data, XmlHttpRequest){
// text - full text of response
// data - response parsed as JSON or XML, whichever is applicable
// XmlHttpRequest - loader object
});