How to wrap every 3 child divs with html using jquery? [duplicate]

Question

Possible Duplicate:
Wrap every 3 divs in a div

First thing, i know i should use a server side language to accomplish this not client side like jquery but that's not the point, i'm just trying to learn how to use it to manipulate html. Heres the html:

<div class="items">
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="1.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 1</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="2.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 2</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="3.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 3</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="4.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 4</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="5.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 5</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="6.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 6</span></div></div>
</div>

I want to be able to wrap every 3 <divs> within the <div class="items"> with yet another div: <div class="row"></div>. So it end up like this:

<div class="items">
 <div class="row">  
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="1.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 1</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="2.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 2</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="3.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 3</span></div></div>
 </div>
 <div class="row">
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="4.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 4</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="5.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 5</span></div></div>
  <div class="boxgrid"><span class="cushycms"><a href="#"><img src="6.jpg" alt=""/></a></span><div class="cover"><span class="film_title">Title 6</span></div></div>
 </div>
</div>  

How can i accomplish this with jquery's selectors? I thought i can use something like:

$("div.items:nth-child(3n)").wrap('<div class="row"></div>');

But that doesn't work. Any ideas please?

Answer 1

I think what you actually want is the range of divs between 1 and 3, not just wrapping the third div, yeah?

For getting a range you'll need to use jquery slice.

Answer 2

As a plugin:

jQuery.fn.wrapInChunks = function(html, chunkSize) {

    chunkSize = chunkSize || 1;

    var items = this.get(),
        rows = [],
        cur = rows[0] = $(html);

    while (items[0]) {

        if (rows[rows.length - 1].children().length === chunkSize) {
            cur = rows[rows.length] = $(html);
        }

        cur.append( items.shift() );

    }

    return this.pushStack(rows);

};

$('.boxgrid').wrapInChunks('<div class="row" />', 3).appendTo('.items');