CSS 使 UL 列表包装 LI

Question

I want to make the UL (yellow) wrap the LI list elements (purple) horizontally without any fixed widths on the UL . The wrap has been added for the example.

HTML

  <ul>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
  </ul>

</div>

CSS

.wrap {
  background: green;
  width: 500px;
  padding: 10px 20px;
}

li {
  display: inline-block;
  width: 70px;
  height: 50px;
  background: purple;
  list-style: none;
}

ul {
  background: yellow;
  margin: 0; padding: 0;
}

Currently

Desired

CodePen here: http://codepen.io/ptimson/pen/IrCHB

Answer 1

To date, the only way you can do this with CSS alone is with media queries - one media query for each #columns layout necessary.

This can be quite tedious using css.

Fortunately, you can automate this using a preprocessor such as LESS.

So say that I have basic markup of <li> 's within an <ul> ...

Here's how to take advantage of LESS to set up the media queries:

CODEPEN - Resize the window to see this in action

First set up some less variables according to the design which you need:

@item-width:100px;
@item-height:100px;
@marginV: 4px;
@marginH: 2px;
@min-cols:2;
@max-cols:9; //set an upper limit of how may columns you want to write the media queries for

Then:

Set up an iteration mixin like this: (You can paste this code into http://less2css.org )

.loopingClass (@index-width) when (@index-width <= @item-width * @max-cols) {
    @media (min-width:@index-width) {
        .container{
            width: @index-width;
        }
    }

    .loopingClass(@index-width + @item-width + 2*@marginH);
}

.loopingClass (@item-width * @min-cols + @min-cols*@marginH*2);

Answer 2

Add this to the parent <ul> of the list

ul {
  display: flex;  
  flex-wrap: wrap;
}

That will cause the <li> to wrap as you want. Then add some margin/padding to the right of the <li> elements so they're reasonably spaced.

Answer 3

<div class="wrap">
  <ul>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li><br>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
  </ul>
</div>

css

.wrap {
  display:table;
  background: green;
  padding: 10px 20px;
}
ul {
    display:table;
  background: yellow;
  margin: 0;
  padding: 0;
    font-size: 0;
}
li {
  margin:0 4px 4px 0;
  display: inline-block;
  width: 70px;
  height: 50px;
  background: purple;
  list-style: none;
}
li:nth-child(7){
    margin-right: 0px;
}

******************************************************************

other

<div class="wrap">
<ul>
    <li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li><li></li>
</ul>
</div>

also

<div class="wrap">
<ul>
    <li>
    <li>
    <li>
    <li>
    <li>
    <li>
    <li>
    <li>
    <li>
    <li>
    <li>
  </ul>
</div>

css

.wrap {
  background: green;
  width: 520px;
  padding: 10px 20px;
}
ul {
  background: yellow;
  margin: 0;
  padding: 0;
  border:0;
}
li {
  position:relative;
  display: inline-block;
  width: 70px;
  height: 50px;
  background: purple;
  list-style: none;
  margin-right: 5px;
}
li:nth-child(7){
    margin-right: 0px;
}
li:nth-child(14){
    margin-right: 0px;
}

This isn't a "bug" (I don't think). It's just the way setting elements on a line works. You want spaces between words that you type to be spaces right? The spaces between these blocks are just like spaces between words. That's not to say the spec couldn't be updated to say that spaces between inline-block elements should be nothing, but I'm fairly certain that is a huge can of worms that is unlikely to ever happen.

Here's some ways to fight the gap and get inline-block elements sitting directly next to each other.

Remove the spaces The reason you get the spaces is because, well, you have spaces between the elements (a line break and a few tabs counts as a space, just to be clear). Minimized HTML will solve this problem, or one of these tricks:

<ul>
  <li>
   one</li><li>
   two</li><li>
   three</li>
</ul>

or

<ul>
  <li>one</li
  ><li>two</li
  ><li>three</li>
</ul

or with comments...

<ul>
  <li>one</li><!--
  --><li>two</li><!--
  --><li>three</li>
</ul>

They're all pretty funky, but it does the trick.

Negative margin You can scoot the elements back into place with negative 4px of margin (may need to be adjusted based on font size of parent). Apparently this is problematic in older IE (6 & 7), but if you don't care about those browsers at least you can keep the code formatting clean.

display: inline-block;
  margin-right: -4px;

Skip the closing tag HTML5 doesn't care anyway. Although you gotta admit, it feels weird.

<ul>
  <li>one
  <li>two
  <li>three
</ul>

Answer 4

将 wrap 的宽度更改为 435px-ish，应该是这样！