chaining and getting the value of an input

This code gets the text that's in a cert开发者_运维知识库ain column of a table row:

var keyA = $(a).children('td').eq(column).text().toUpperCase();

Q: How do I rewrite this to get the value of an input tag that's in the table cell?

var keyA = $(a).children('td').eq(column).('input').val().toUpperCase();

Try this:

var keyA = $(a).children('td').eq(column).find('input').val().toUpperCase();

Oh! It's:

children('input')