EasyUI 分頁其實不復雜，用RoR 搞定很簡單。
$('#td_grid').datagrid({
url:'/data/get_grid_data',
pagination:true,
pageSize:20,
striped:true,
== 關鍵是如何返回 , 一個是total， 一個是json數據：
def get_grid_data
page = params['page']
rows = params['rows']
#cond_str = bla.
offset = (page.to_i-1)*rows.to_i
total = Db.find_by_sql("select count(*) from my_table #{cond_str};")[0].count
user = Db.find_by_sql("select * from my_table #{cond_str} order by id offset #{offset} limit #{rows};")
render :text => {"total" => total, "rows" => user}.to_json
end