How to style an element based on its flex box order - css

Question

I have some elements inside a DIV which get reordered depending on the size of the screen. I want to style each of these elements differently depending on their flex-box order. Because the media queries are inside a framework, I'd rather not write my own media queries to do this, because I don't want to have to remember to change my media queries if the framework changes the break points for their media queries. I tried using the + sibling selector, but apparently this only applies to the order of elements in the original markup, not the flex box rendering order. Is there any way to style an element based on the order in which it appears in the rendered DOM?

Answer 1

As mention in the comments, you wont be able to use nth-child, as the styles will apply to the order of the actual DOM, not the rendered DOM.
You will have to add extra classes to the markup in order to do this.
So rather than re-order using nth-child, re-order using the extra classes.
* {
padding: 0;
margin: 0;
box-sizing: border-box;
}
.flexGrid {
display: flex;
flex-wrap: wrap;
width: 100%;
}
.flexGrid__item {
border: 1px solid pink;
width: 50%;
height: 100px;
}
.flexGrid__item--alpha {
background: pink;
order: 1;
}
.flexGrid__item--bravo {
order: 2;
}
.flexGrid__item--charlie {
order: 3;
}
.flexGrid__item--delta {
order: 4;
}
#media screen and (min-width: 500px) {
.flexGrid__item {
width: 25%;
}
.flexGrid__item--alpha {
order: 5;
}
}
<div class="flexGrid">
<div class="flexGrid__item flexGrid__item--alpha"></div>
<div class="flexGrid__item flexGrid__item--bravo"></div>
<div class="flexGrid__item flexGrid__item--charlie"></div>
<div class="flexGrid__item flexGrid__item--delta"></div>
</div>
More detail in this fiddle:
https://jsfiddle.net/pua5u8a4/1/