Get the value of children in jquery

How to get the value of cell in a table when the user click on the next cell?

<table id="registrarsTable">

<c:forEach items="${requestScope.AllUsers}" var="user" varStatus="loop">
    <tr class="userRow">
        <td class="numberWidth">${loop.index + 1}</td>
        <td class="nameWidth user" id="${user.userno}">${user.fullName}</td>
        <td>

         <button name="DeactivateBtn" 开发者_Python百科 id="deactivate" class="deactivate btn">deactivate</button>

        </td>
    </tr>
</c:forEach>

in jquery I want to get the value of attribute "id" from second td when user click on deactivate button.

I make like this

var userNo = $('td.user', $(this).parents(".userRow")).attr('id');

and like this

      var userNo = $($(this).parent(".userRow") > "td").attr("id");

and no one works!

$('#deactivate').click(function() {
    var userNo = $(this).parent().prevAll('td.user').attr('id');
});

From the button (which is this), traverse up to the parent (the <td> containing the deactivate button). Then, to the previous sibling <td> with the class user, and get the id attribute.

Alternatively, if you want to avoid relying on the fact the the deactivate button is in a <td> after the user name's <td>, you can do this:

$('#deactivate').click(function() {
    var userNo = $(this).closest('tr').find('td.user').attr('id');
});

Which finds the parent <tr> with closest and then the <td class="user"> with find.

Working example: http://jsfiddle.net/FishBasketGordo/Bk6ML/

API References:

• parent() - http://api.jquery.com/parent
• prevAll() - http://api.jquery.com/prevAll
• closest() - http://api.jquery.com/closest
• find() - http://api.jquery.com/find