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function loadNext() {
  var newStart = dataProvider.getRowCount();
  $.ajax({
    url: "/resource/data/carData2.json",
    success: function(data) {
      dataProvider.fillJsonData(data,
        {fillMode: "append", start: newStart, count: 100});
    }
  });
}

gridView.onScrollToBottom = function() {
  loadNext();
}

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function loadNext() {
  var newStart = dataProvider.getRowCount();
  $.ajax({
    url: "/resource/data/carData2.json",
    success: function(data) {
      dataProvider.fillJsonData(data,
        {fillMode: "append", start: newStart, count: 100});
    }
  });
}

var scrollItem = 0;

gridView.onTopItemIndexChanged = function(grid, item) {
  if (item > scrollItem) {
    scrollItem += 50;
    loadNext();
  }
}