Magento input values in editable grid are lost on changing page display limit count

I am making a editable grid in magento. Now when I use pages to change displayed values in page- 20,50,100,200, It sends an ajax request and fetch data and still saves the already checked boxes(earlier checked boxes are still selected), but all of my input values in grid are lost. how can I save those v开发者_如何学编程alues?

There is a method in the Grid setSaveParametersInSession()

Actually these values are stored in javascript(grid.js) global object.