flex-wrap: nowrap with row and column

Question

I have a flex container with nowrap flow, some items might start as column, how can I manage them? It's like a tree layout. Final result might be like this image:

Here's a stackblitz and snippet:

.container{
  display: flex;
  width: 100%;
  flex-wrap: nowrap;
  padding: 5px;
  border:2px solid gray;
}

.item{
  width: 150px;
  flex:1 1 150px;
  border: 1px solid green;
  margin-right: 2px;
}

<div class="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
  <div class="item">5</div>
  <div class="item">6</div>
  <div class="item">7</div>
  <div class="item">8</div>
  <div class="item">9</div>
</div>

Answer 1

I can think of CSS grid layout to make this layout easily:

• use grid-auto-flow: column so that the items are placed in the column direction,

• use grid-row and grid-column to the specific item elements to achieve the configuration required.

See demo below:

.container{
  display: inline-grid; /* inline grid container */
  grid-auto-flow: column; /* items placed vertically */
  padding: 5px;
  border: 2px solid gray;
}

.item:nth-child(2) {
  grid-row: 1;
}
.item:nth-child(4),
.item:nth-child(5) {
  grid-row: 2;
}

.item:last-child {
  grid-row: 4;
}

.item{
  width: 150px;
  border: 1px solid green;
  margin-right: 2px;
}

<div class="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
  <div class="item">5</div>
  <div class="item">6</div>
  <div class="item">7</div>
  <div class="item">8</div>
</div>