Flexbox item wrap to a new line [duplicate]

Answer 1

All flex items are set by default to order: 0. This means they will be laid out in the order they appear in the source code.

If you give the last item order: 1, this forces it to be last when additional items are added.

The ::before and ::after pseudo elements on a flex container create new flex items.

So if we add one pseudo element with a large enough width, it will force your last item (set by order) to the next row.

.flex {
  display: flex;
  flex-wrap: wrap;
  border: 2px solid red;
}

.item {
  width: 50px;
  height: 50px;
  margin: 5px;
  border: 2px solid blue;
}

.new-string {
  order: 1;
}

.flex::after {
  content: "";
  flex: 0 0 100%;
  height: 0;
}

<div class="flex">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item new-string"></div>
</div>

Answer 2

This seems to be possible to do with Grid-layout. First to position items inline you can use

grid-template-columns: repeat(auto-fill, 50px);

so that each item takes 50px and it will position items in one line until no more items can fit in one line. And then you can use grid-column-start: 1; on specific item so that it goes to new line.

* {
  box-sizing: border-box;
}
.flex {
  display: grid;
  grid-gap: 10px;
  grid-template-columns: repeat(auto-fill, 50px);
  border: 2px solid red;
}

.item {
  width: 50px;
  height: 50px;
  margin: 5px;
  border: 2px solid blue;
}

.new-string {
  grid-column-start: 1;
  background: red;
}

<div class="flex"><div class="item"></div><div class="item"></div><div class="item"></div><div class="item new-string"></div><div class="item"></div><div class="item"></div><div class="item"></div><div class="item"></div><div class="item new-string"></div><div class="item"></div><div class="item"></div><div class="item new-string"></div><div class="item"></div></div>

Answer 3

If you look at this great answer you'll notice that the only cross-browser way (without 2 line break limit) is inserting 100%-width empty blocks ("line-breaks"). So for similar markup this will look like

.flex {
  display: flex;
  flex-wrap: wrap;
  border: 2px solid red;
}

.item {
  width: 50px;
  height: 50px;
  margin: 5px;
  border: 2px solid blue;
}

.line-break {
  width: 100%;
}

<div class="flex">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="line-break"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="line-break"></div>
  <div class="item"></div>
  <div class="line-break"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>

If you want to preserve your markup style, you'll have to insert this line-break blocks via JavaScript:

var items = document.querySelectorAll(".flex > .item.new-string");

for (var i = 0; i < items.length; i++) {
  var lineBreak = document.createElement('div');
  lineBreak.className = "line-break";

  items[i].parentNode.insertBefore(lineBreak, items[i]);
}

.flex {
  display: flex;
  flex-wrap: wrap;
  border: 2px solid red;
}

.item {
  width: 50px;
  height: 50px;
  margin: 5px;
  border: 2px solid blue;
}

.line-break {
  width: 100%;
}

<div class="flex">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item new-string"></div>
  <div class="item"></div>
  <div class="item new-string"></div>
  <div class="item new-string"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>

Answer 4

As an alternative you could simply do this

HTML

<div class="flex">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item line-break"></div>
  <div class="item new-string"></div>
</div>

CSS

.line-break {
    width: 100%;
}

The 100% width flex item will give you the line break. Easiest way to get a new line in the flex grid, sure you need an extra div but I don't find it that bad of a way to do it