alvurs,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(function() {
$("table").on("click", ".btn", function() {
var text = $(this).parent().find(".hidden").text().trim();
alert(text)
} )
});
</script>
</head>
<body>
<table width="400" summary="" >
<tbody>
<tr>
<td>
<input type="button" class="btn btn-default" value="Удалить запись"/>
<div class="hidden">
ЗНАЧЕНИЕ
</div>
</td>
</tr>
</tbody>
</table>
</body>
</html>