grid-auto-flow
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since October 2017.
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grid-auto-flow
属性控制着自动布局算法怎样运作,精确指定在网格中被自动布局的元素怎样排列。
尝试一下
grid-auto-flow: row;
grid-auto-flow: column;
grid-auto-flow: row dense;
<section class="default-example" id="default-example">
<div class="example-container">
<div class="transition-all" id="example-element">
<div>One</div>
<div>Two</div>
<div>Three</div>
<div>Four</div>
<div>Five</div>
</div>
</div>
</section>
#example-element {
border: 1px solid #c5c5c5;
display: grid;
grid-template-columns: 1fr 1fr 1fr;
grid-template-rows: repeat(3, minmax(40px, auto));
grid-gap: 10px;
width: 220px;
}
#example-element > div {
background-color: rgba(0, 0, 255, 0.2);
border: 3px solid blue;
}
#example-element > div:nth-child(1) {
grid-column: auto / span 2;
}
#example-element > div:nth-child(2) {
grid-column: auto / span 2;
}
语法
css
/* Keyword values */
grid-auto-flow: row;
grid-auto-flow: column;
grid-auto-flow: dense;
grid-auto-flow: row dense;
grid-auto-flow: column dense;
/* Global values */
grid-auto-flow: inherit;
grid-auto-flow: initial;
grid-auto-flow: unset;
此属性有两种形式:
- 单个关键字:
row
、column
,或dense
中的一个。 - 两个关键字:
row dense
或column dense
。
取值
row
-
该关键字指定自动布局算法按照通过逐行填充来排列元素,在必要时增加新行。如果既没有指定
row
也没有column
,则默认为row
。 column
-
该关键字指定自动布局算法通过逐列填充来排列元素,在必要时增加新列。
dense
-
该关键字指定自动布局算法使用一种“稠密”堆积算法,如果后面出现了稍小的元素,则会试图去填充网格中前面留下的空白。这样做会填上稍大元素留下的空白,但同时也可能导致原来出现的次序被打乱。
如果省略它,使用一种「稀疏」算法,在网格中布局元素时,布局算法只会「向前」移动,永远不会倒回去填补空白。这保证了所有自动布局元素「按照次序」出现,即使可能会留下被后面元素填充的空白。
正式语法
示例
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" onchange="changeGridAutoFlow()">
<option value="column">column</option>
<option value="row">row</option>
</select>
<input id="dense" type="checkbox" onchange="changeGridAutoFlow()" />
<label for="dense">dense</label>
CSS
css
#grid {
height: 200px;
width: 200px;
display: grid;
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;
}
规范
Specification |
---|
CSS Grid Layout Module Level 2 # grid-auto-flow-property |
浏览器兼容性
参见
- Related CSS properties:
grid-auto-rows
,grid-auto-columns
,grid
- Grid Layout Guide: Auto-placement in grid layout
- Video tutorial: Introducing Grid auto-placement and order