Add a sequence of numbers to divs

I have a list of 8 divs and need to add a sequence of cl开发者_如何学运维ass numbers to them using Jquery to style them individually. Need to add them to the 'content-block' div see example below.

The desired effect will be something like this:

<div class="wrapper">
<div id="content-block" *class="post1"*>
</div></div>

<div class="wrapper">
<div id="content-block" *class="post2"*>
</div></div>

I have added the script

**Javascript**
$('.post-block').each(function(i){
$(this).addClass('post' + i);})

but I need to link them with anchor links so I will need a way to add an ID to the post-block.

Desired effect
**HTML**
<div id="post1" class="post-block">
</div>

<div id="post2" class="post-block">
</div>

Many thanks

jsFiddle example

First, you can only use an ID once on a page. You can use classes many times on a page.

Because of this I made content-block a class, and I made your various post1, post2... ids.

The function below will go through each of the elements that have the content-block class within a wrapper class, and it will add an appropriate id to each one. For the callback function of each() you can make use of the index and value as arguments. I created a separate num variable, since index starts at zero.

In the each function, you could also use this instead of value.

The jQuery:

$.each($(".wrapper > .content-block"), function(index, value){
    var num = index + 1;
    $(value).attr("id","post"+ num);
});

You can use this:

$(".content-block").each(function(i){
    $(this).addClass("post" + i);
})

Obs: I'm using class selector (".content-block") not id selector ("#content-block").

If you get rid of the IDs, you could simply do this (assuming there's only one child <div> per .wrapper.

$(".wrapper > div").addClass(function(i) { return 'post' + (i + 1) });

This will result in:

<div class="wrapper">
    <div class="post1"></div>
</div>
<div class="wrapper">
    <div class="post2"></div>
</div>
<div class="wrapper">
    <div class="post3"></div>
</div>
...

You are probably confusing unique CSS IDs with classes, which are normally used to give elements a common look and feel. Here's how you would assign unique IDs to all elements within your markup:

$('.wrapper').find('div').each(function(index){
    $(this).attr('id', 'unique-' + ++index);
});

Let's assume you fix the duplicated id problem, and you have an outer container object. Then we'd have:

$('div#outercontainer').find('div.wrapper > div').each( function(i){
  var postnum = i+1; // remove any possible overloaded "+" operator ambiguity
  $(this).addClass('post'+postnum);
});

Why not turn your divs into li, part of a OL element? Semantically more relevant...