activeSheet.setRowCount(5);
activeSheet.setColumnCount(5);
 $("#button1").click(function(){
        //Acquiring selection ranges
        var selectedRanges = activeSheet.getSelections();      
for(var i = 0; i < selectedRanges.length; i++){
alert(selectedRanges[i].row);
alert(selectedRanges[i].rowCount);
alert(selectedRanges[i].col);
alert(selectedRanges[i].colCount);
}
});  

//Add button control to page
<input type="button" id="button1" value="button1"/>