I have a lot of divs identical to the one below

<div class="example">

Some of these divs have child nodes, which look something like this

<input type="submit" name="auto-gen" value="Extra" id="auto-gen" class="add-button" aria-label="" data-active="True" data-isfirstcontrol="False" type="button">

Due to working with legacy software, I can’t change anything about the structure of these divs (can’t change id’s or change class name or anything). However, I want to be able to add some CSS (float: right;) to the example class, but only if they have a child with the "add-button" class.

I’ve been trying to do stuff like below:

$('.add-button').parent().style.styleFloat = 'right'

However, whatever I try I get the following error message

Uncaught TypeError: Cannot set properties of undefined (setting 'styleFloat').

Anyone have any ideas?

>Solution :

If there are no .add-button elements which parent() is not a .example, you can just target every add-button and style his parent()

Using jquery

$(".add-button").parent().css({ float: "right" });

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="example">
  
</div>

<div class="example">
    <input type="submit" name="auto-gen" value="Extra" id="auto-gen" class="add-button" aria-label="" data-active="True" data-isfirstcontrol="False" type="button">
</div>

Using plain javascript
^{You might not need Jquery}

document.querySelectorAll('.add-button').forEach(e => e.parentNode.style.float = 'right')

<div class="example">
  
</div>

<div class="example">
    <input type="submit" name="auto-gen" value="Extra" id="auto-gen" class="add-button" aria-label="" data-active="True" data-isfirstcontrol="False" type="button">
</div>