How to Create a Snake-Like Pattern in CSS Grids with grid-auto-flow and Grid Row Structure?

Using Grid-auto-flow for Snake-line Cell Filling

In CSS grids, grid-auto-flow governs the automatic placement of grid items within the grid. By default, the grid-auto-flow property is set to row, which fills the grid by rows.

To create a snake-like pattern in a column-based grid, we can modify the grid-auto-flow property to column dense. This will fill the grid by columns, but in a dense manner, meaning items will fill available space as tightly as possible.

To produce the desired snake-like pattern, we must specify a custom grid row structure to determine which cells should be placed in each row. This can be achieved using the grid-row property.

Consider the following code snippet:

<code class="css">.container {
  display: grid;
  grid-template-rows: 20px 20px 20px;
  grid-auto-columns: 20px;
  grid-auto-flow: column dense;
}

.container > div:nth-child(6n + 4) {
  grid-row: 3;
}
.container > div:nth-child(6n + 5) {
  grid-row: 2;
}</code>

Here, we set up a grid with three rows and use grid-auto-flow: column dense to fill the grid by columns. We then use the nth-child selector to specify that every sixth child element (4th, 10th, 16th, etc.) should be placed in the third row, and every fifth child element (5th, 11th, 17th, etc.) should be placed in the second row. This produces the alternating snake-like pattern as desired.

<code class="html"><div class="container">
  <!-- Each div represents one cell -->
  <div></div><div></div><div></div>
  <div></div><div></div><div></div>
</div></code>

This code snippet produces the following output:

01 06 07
02 05 08
03 04 09

By manipulating grid-auto-flow and defining a custom row structure, you can use CSS grids to create visually appealing patterns like snake-line cell filling.

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