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---
title: grid-auto-flow
slug: Web/CSS/grid-auto-flow
tags:
- CSS
- CSS グリッド
- CSS プロパティ
- リファレンス
- recipe:css-property
browser-compat: css.properties.grid-auto-flow
---
{{CSSRef}}
The **`grid-auto-flow`** CSS property controls how the auto-placement algorithm works, specifying exactly how auto-placed items get flowed into the grid.
{{EmbedInteractiveExample("pages/css/grid-auto-flow.html")}}
## 構文
```css
/* キーワード値 */
grid-auto-flow: row;
grid-auto-flow: column;
grid-auto-flow: dense;
grid-auto-flow: row dense;
grid-auto-flow: column dense;
/* グローバル値 */
grid-auto-flow: inherit;
grid-auto-flow: initial;
grid-auto-flow: revert;
grid-auto-flow: unset;
```
This property may take one of two forms:
- a single keyword: one of `row`, `column`, or `dense`.
- two keywords: `row dense` or `column dense`.
### 値
- `row`
- : Items are placed by filling each row in turn, adding new rows as necessary. If neither `row` nor `column` is provided, `row` is assumed.
- `column`
- : Items are placed by filling each column in turn, adding new columns as necessary.
- `dense`
- : "dense" packing algorithm attempts to fill in holes earlier in the grid, if smaller items come up later. This may cause items to appear out-of-order, when doing so would fill in holes left by larger items.
If it is omitted, a "sparse" algorithm is used, where the placement algorithm only ever moves "forward" in the grid when placing items, never backtracking to fill holes. This ensures that all of the auto-placed items appear "in order", even if this leaves holes that could have been filled by later items.
## Formal definition
{{cssinfo}}
## Formal syntax
{{csssyntax}}
## Examples
### Setting grid auto-placement
#### HTML
```html
<div id="grid">
<div id="item1"></div>
<div id="item2"></div>
<div id="item3"></div>
<div id="item4"></div>
<div id="item5"></div>
</div>
<select id="direction">
<option value="column">column</option>
<option value="row">row</option>
</select>
<input id="dense" type="checkbox">
<label for="dense">dense</label>
```
#### CSS
```css
#grid {
height: 200px;
width: 200px;
display: grid;
gap: 10px;
grid-template: repeat(4, 1fr) / repeat(2, 1fr);
grid-auto-flow: column; /* or 'row', 'row dense', 'column dense' */
}
#item1 {
background-color: lime;
grid-row-start: 3;
}
#item2 {
background-color: yellow;
}
#item3 {
background-color: blue;
}
#item4 {
grid-column-start: 2;
background-color: red;
}
#item5 {
background-color: aqua;
}
```
```js hidden
function changeGridAutoFlow() {
var grid = document.getElementById("grid");
var direction = document.getElementById("direction");
var dense = document.getElementById("dense");
var gridAutoFlow = direction.value === "row" ? "row" : "column";
if (dense.checked) {
gridAutoFlow += " dense";
}
grid.style.gridAutoFlow = gridAutoFlow;
}
const selectElem = document.querySelector('select');
const inputElem = document.querySelector('input');
selectElem.addEventListener('change', changeGridAutoFlow);
inputElem.addEventListener('change', changeGridAutoFlow);
```
#### Result
{{EmbedLiveSample("Setting_grid_auto-placement", "200px", "230px")}}
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- Related CSS properties: {{cssxref("grid-auto-rows")}}, {{cssxref("grid-auto-columns")}}, {{cssxref("grid")}}
- Grid Layout Guide: _[Auto-placement in grid layout](/en-US/docs/Web/CSS/CSS_Grid_Layout/Auto-placement_in_CSS_Grid_Layout)_
- Video tutorial: _[Introducing Grid auto-placement and order](http://gridbyexample.com/video/series-auto-placement-order/)_
|
