I am new to Yii, kindly help me to find how to access value by value from controller using ajax

If you set the pageSize in pagination to 1 in your DataProvider, then you can use the pager to access the data row by row, although this will fully render at least the view each time. I suspect that this is not what you intend. If you really want to access something bit by bit using ajax, I would suggest that you set up a new action in the controller specifically for the ajax to call, that returns the data you want.