使用flex项目作为flex容器

Question

I wanted to use flexbox with a column layout, but I wanted the top n - 1 flex items to be pinned to the top and the nth flex item to be pinned to the bottom of the main flex container area.

I solved this by using the nth flex item to also be a new flexbox/flex container using justify-content: flex-end , but I couldn't find any examples that were doing this - so is this a correct/acceptable solution according to the standard and, if not, how would I otherwise go about this with flexbox?

Here's a quick example:

 .flex-container { display: -webkit-flex; display: flex; -webkit-flex-direction: column; flex-direction: column; width: 300px; height: 240px; background-color: Silver; } .flex-container-bottom { display: -webkit-flex; display: flex; -webkit-flex-direction: column; flex-direction: column; width: 300px; height: 240px; background-color: orange; -webkit-justify-content: flex-end; -ms-flex-pack: end; justify-content: flex-end; } .flex-item { background-color: DeepSkyBlue; width: 100px; height: 100px; margin: 5px; } .flex-item-bottom { background-color: red; width: 100%; height: 50px; } 

 <div class="flex-container"> <div class="flex-item">flex item 1</div> <div class="flex-item flex-container-bottom"> <div class="flex-item-bottom">flex item 2</div> </div> </div> 

Answer 1

The spec isn't very clear on this, but it states that "Each in-flow child of a flex container becomes a flex item, and each contiguous run of text that is directly contained inside a flex container is wrapped in an anonymous flex item." This seems to imply that if I put a flex container inside another flex container that the inner flex container would also implicitly become a flex item for its containing flex container even if this is not explicitly defined. Example 1 of the specification shows a flex container within a flex container and assuming it is legal syntax it follows that my use case may also be legal, but the section with example 1 is marked as non-normative... (╯°□°）╯︵ ┻━┻... At this point I'm just going to assume this is correct.

Answer 2

It's hard to say that your use of flex-end is wrong because you're getting the desired effect, but there's an easier way to do it.

Try using:

.flex-container{
   display: flex;
   justify-content: space-between;
   flex-direction: column;
}

justify-content: space-between; forces your flex items to spread out as much as possible in the flex container.

This is the reference guide I use whenever doing anything with flexboxes: https://css-tricks.com/snippets/css/a-guide-to-flexbox/

Answer 3

You can also try this this will make your last item to stick to bottom of your parent container

.flex-container{
    position:relative;
   }
 .flex-item-bottom{
    position:absolute;
    bottom:0;
 }