如何使用ajax填充动态生成的选择框

I haven't been able to find a solution for the particular problem I'm having with this project. I need to the following: dynamically add rows to a table that contain two select boxes AND use ajax to auto-populate the select options of the 2nd select box, based on the value of the first select box... in the respective table row (that was dynamically added on the fly by some js).I haven't been able to find a solution for the