Async call to backendless data

Question

This works, but it freezes the page during call:

  getAllNewEstate: function(callback) {
    function NewEstateData() {};
    var items = Backendless.Persistence.of( NewEstateData ).find().data;
    callback(items)
  },

How can i make async call?

docs: http://backendless.com/documentation/data/js/data_sync_and_async_calls.htm http://backendless.com/documentation/data/js/data_basic_search.htm

updates

I tried:

  getAllNewEstate: function(callback) {
    function NewEstateData() {};
    Backendless.Persistence.of( NewEstateData ).find( function(e) {
        console.log('event', e);
        callback(e.data);
    });
  },

// no errors, no console.log,

  getAllNewEstate: function(callback) {
    Backendless.Persistence.of( NewEstateData ).find( function(e) {
        console.log('event', e);
        callback(e.data);
    });
  },

// Uncaught ReferenceError: NewEstateData is not defined

Answer 1

You need add callback for call find asynchronously:

getAllNewEstate: function(callback) {
    function NewEstateData() {};
    Backendless.Persistence.of( NewEstateData ).find( new Backendless.Async(
        function(e) {
             console.log(e);
             callback(e);
        })
    );
}