A flexbox grid with three (3) rows and four (4) columns

问题

I have a div and I have 12 items aligned at center using flex.

But I just want to have 4 items in row, so I want 3 rows of 4 columns.

This is ok to do with flex? And do you know how to do?

I'm trying to do that like this: https://jsfiddle.net/18mzsqcx/1/, but it's not working.

Or it's better to just create a div for example .col4 with width equal to 25% and some margins and put this class .col4 in each item?

*,
*:after,
*:before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}

.container {
  float: left;
  width: 100%;
  background-color: red;
}

.content {
  width: 94%;
  margin: 0px auto;
  background-color: yellow;
  padding: 30px;
}

.categories {
  display: flex;
  justify-content: space-between;
  background-color: blue;
}

.categories_item a {
  color: green;
}

.categories_item {
  flex-grow: 1;
}

<div class="container">
  <div class="div content">


    <div class="categories">
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>

    </div>
  </div>
</div>

回答1:

By default, a flex container is set to flex-wrap: nowrap. This means that flex items will not be able to wrap to new lines.

So the first thing you should do is add flex-wrap: wrap to your container.

.categories {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;  /* NEW */
}

Then, define your flex items so that only four can fit on a row.

Instead of this:

.categories_item { flex-grow: 1; }

Try this:

.categories_item { flex: 1 0 20%; margin: 5px; }

revised demo

*,
*:after,
*:before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.container {
  float: left;
  width: 100%;
  background-color: red;
}

.content {
  width: 94%;
  margin: 0px auto;
  background-color: yellow;
  padding: 30px;
}

.categories {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;                /* NEW */
}

.categories_item a {
  color: white;
}

.categories_item {
  flex: 1 0 20%;                 /* NEW */
  margin: 5px;                   /* NEW */
  background-color: blue;
}

<div class="container">
  <div class="div content">
    <div class="categories">
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
      <div class="categories_item">
        <a href="" class="">
          <span>Item</span>
        </a>
      </div>
    </div>
  </div>
</div>

回答2:

This will do the trick, keep three elements in one div, so there will be 4 divs for 12 items

.container {
  float: left;
  width: 100%;
  background-color: red;
}

.content {
  width: 94%;
  margin: 0px auto;
  background-color: yellow;
  padding: 30px;
}

.categories {
  display: flex;
  justify-content: space-between;
  background-color: blue;
}

.categories_item a {
  color: green;
}

.categories_item {
  flex-grow: 1;
}

<div class="container">
  <div class="div content">


    <div class="categories">
      <div id="row">

        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>

        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>

        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>


        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>
      </div>
      <div id="row">
        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>

        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>


        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>
        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>
      </div>
      <div id="row">
        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>

        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>

        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>

        <div class="categories_item">
          <a href="" class="">
            <span>Item</span>
          </a>
        </div>
      </div>

    </div>
  </div>
</div>

来源：https://stackoverflow.com/questions/45379566/a-flexbox-grid-with-three-3-rows-and-four-4-columns

标签

html

css

flexbox