jQuery: how to address a sub item with a special class

Question

I want to iterate over the line elements. Each line element has item elements as child elements. So first I iterate over line and then I want to address a certain item element e.g. the third. This is the code I have:

$(".pricetable .righttable .line:not(.blank)").each(function(j) {
    var currentLine = $(".pricetable .righttable .line:not(.blank)").eq(j);
    currentLine.(".item").each(function(k) {
        $(".pricetable .righttable .line .item").eq(i).addClass("active");
    });
});

The problem is that I don't know how to address the child element with the item class.

currentLine.(".item").each(function(k)

This does not work.

XML filter is applied to non-XML value ({0:#2=({}), length:1, prevObject:{length:3, prevObject:{0:#1=({}), context:#1#, length:1}, context:#1#, selector:".pricetable .righttable .line:not(.blank)", 0:#2#, 1:({}), 2:({})}, context:#1#, selector:".pricetable .righttable .line:not(.blank).slice(0,1)"}) file:///C:/Users/xxx/lib/pricetable.js Line 112

Edit:
Wow, I didn't thought I get such a good and fast response! I think I go with this solution:

$(".pricetable .righttable .line:not(.blank)").each(function(j) {
    $(this).children(".item").eq(i).addClass("active");
});

Answer 1

$(".pricetable .righttable .line:not(.blank)").each(function(j) {
    var currentLine = $(".pricetable .righttable .line:not(.blank)").eq(j);
    currentLine.find(".item").each(function(k) {
        $(".pricetable .righttable .line .item").eq(i).addClass("active");
    });
});

http://api.jquery.com/find/

If they're direct children of currentLine, you should just be able to do children('.item') in place of find('.item'). This is called Traversing the DOM. Visit this page (http://api.jquery.com/category/traversing/) and read through the descriptions of some of the functions there. They'll be very useful to keep in mind if you traverse a lot :)

Answer 2

$('.pricetable .righttable .line:not(.blank)').find('.item').each(function() {
  // this point to child element - item
  // use $(this).addClass('active');
});

Answer 3

Slight improvement before I answer your question:

var currentLine = $(".pricetable .righttable .line:not(.blank)").eq(j);

is easily replaceable with:

var currentLine = $(this);

---

Second, if you wish to find the 3rd .item element inside of $(this), use .find()

.find(".item:nth-child(3)");

No need to iterate over the lines. If you must iterate over the lines, then just compare k to 2 (As JavaScript counts from 0) and that's it.

Answer 4

If you want to do something with the nth item of each line, it's much easier than it looks:

var index = 3; // the third "item" element 
$(".pricetable .righttable .line:not(.blank) .item:nth-child(" + index + ")")
  .addClass("active");

See it in action.

Is there something else you want to do that the above is not sufficient for?

Answer 5

$(".pricetable .righttable .line:not(.blank)").each(function() {
  $(this).find('.item:nth-child(2)').addClass('active');
});