将增加的值应用于焦点或单击时的文本字段

I have 18 rows of text fields and in each one I need to give it an increasing ID, however they're not just straight forward, as the bottom row in the grid could need ID 1 and the first one could need ID 15 depending on what is chosen. It doesn't need to look that pretty as long as it does the job. I will be using it to insert data in to a database from an iPad and ideally having an onclick event on the row title, and that adding the next incremental number would be perfect, however if that's not possible adding an onfocus event would be fine.I have 18 rows of text fields and in each one I