BX.ajax.loadJSON

XMLHttpRequest
BX.ajax.loadJSON(
 string url,
 function callback[,
 function callback_failure]
);

or:

XMLHttpRequest
BX.ajax.loadJSON(
 string url,
 object data,
 function callback[,
 function callback_failure]
);

The function loads json-object from the specified url and passes it to the callback handler.

Function parameters