lastChild not working

Question

I have the following code:

Answer 1

this is what I would have done, but I'm not clear as to if it's what you want:

$(function () {
    var lastchild = $('#div div:last-child').attr('id');
    alert(lastchild);
});

http://jsfiddle.net/pFjPS/

also, I don't believe classes or ids can start with numbers, so your markup is probably not valid

edit : HTML5 supports it, but is not generally recommended.

Answer 2

Your elements probably have text nodes around them, so the last child node of the outer <div> won't necessarily have an "id" attribute.

I'm not sure if all browsers support it, but there's a "lastElementChild" property that explicitly gets only elements, and not things like comment nodes or text nodes. Failing that, you could just loop through the node list looking for type 1 nodes.

Answer 3

I would use this approach, since ID is a property and not an attribute.

$(function () {
    var lastchild = $('#div div:last-child').prop('id');
    alert(lastchild);
});

Answer 4

In jquery:

$(function(){
  alert($("#div :last-child").attr('id'));
});

Answer 5

The jQuery way:

// assuming the last child is always a div
var lastcommentq = $('#div > div:last-child').attr('id');

// alternatively
var lastcommentq0 = $('#div').children('div').last().attr('id');

The JavaScript way:

var lastcommentq = document.getElementById('div').lastElementChild.id;

Note that this works in all modern browsers and IE 9+. See lastElementChild on MDN.

Answer 6

is this your wanted behaivour?

$(document).ready(function(){
     var lastchild   = $("div").last().attr("id")
     alert(lastchild);
     });


<div id="div">
    <div id ="1">

    </div>     
    <div id="2">

    </div>  
</div>        

check out this fiddle for live example

http://jsfiddle.net/sHgbF/