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Ruby

Add odd/even classnames to a Jekyll post loop

Hey, I wanted to know how you would add odd/even class names to a Jekyll post loop.

Here is my code:

<ul class="entries">
    {% for post in site.posts %}
    <li><a class="entry" href="{{ post.url }}">
        <img src="{{ post.image }}">
        <h2>{{ post.title }}</h2>
    </a></li>
    {% endfor %}
</ul>

This is the generated code to be

<ul class="entries">
    <li><a class="entry odd" href="posts/post1">
        <img src="img1.jpg">
        <h2>Post 1</h2>
    </a></li>
    <li><a class="entry" href="posts/post2">
        <img src="img2.jpg">
        <h2>Post 2</h2>
    </a></li>
    <li><a class="entry odd" href="posts/post3">
        <img src="img3.jpg">
        <h2>Post 3</h2>
    </a></li>
    <li><a class="entry" href="posts/post4">
        <img src="img4.jpg">
        <h2>Post 4</h2>
    </a></li>
</ul>

I really need it for my first project. Thanks in advance!

4 Answers

Hi Enrique,

What you need is something that alternates between states.

You could use a Boolean, which has only two states, or something which behaves like it.

In this case, with pseudo-logic, you could start off with a variable like:

odd = true;
for posts in site.posts
    ... code ...
    if odd == true
        ... output odd ...

    odd = !odd // flips the Boolean from true to false
endfor

Is that Jekyll code? As in Jekyll the static site generator?

http://jekyllrb.com

Hi Enrique,

No, it isn't. It's just a pseudo-code to suggest a way to tackle the problem.

The actual code isn't syntactically accurate, but merely to illustrate a path to solving it.

If you know the jekyll syntax, you could look for parallels to execute a similar logic?

I've done that logic before with PHP but can't seem to find a way to do it with Jekyll. :sob: