justify-items

版本：CSS3

CSS 的justify-items属性为所有盒中的项目定义了默认的justify-self，可以使这些项目以默认方式沿适当轴线对齐到每个盒子。

该属性的作用效果取决于我们使用的布局模式：

• 在块级布局中，会将其包含的项目在其行内轴上对齐。
• 绝对定位的元素中，会将其包含的项目在其行内轴上对齐，同时考虑top、left、bottom、right的值。
• 表格单元中，该属性被忽略。
• 弹性盒子布局中，该属性被忽略。
• 网格布局中，会将其网格区域内的项目在其行内轴上对齐）。

示例

/* Basic keywords */
justify-items: auto;
justify-items: normal;
justify-items: stretch;

/* Positional alignment */
justify-items: center;     /* Pack items around the center */
justify-items: start;      /* Pack items from the start */
justify-items: end;        /* Pack items from the end */
justify-items: flex-start; /* Pack flex items from the start */
justify-items: flex-end;   /* Pack flex items from the end */
justify-items: self-start;
justify-items: self-end;
justify-items: left;       /* Pack items from the left */
justify-items: right;      /* Pack items from the right */

/* Baseline alignment */
justify-items: baseline;
justify-items: first baseline;
justify-items: last baseline;

/* Overflow alignment (for positional alignment only) */
justify-items: safe center;
justify-items: unsafe center;

/* Legacy alignment */
justify-items: legacy right;
justify-items: legacy left;
justify-items: legacy center;

/* Global values */
justify-items: inherit;
justify-items: initial;
justify-items: unset;

浏览器支持

IE11版本浏览器都支持justify-items

语法

justify-items:normal| auto| stretch| | ?| left | right ]| legacy | legacy &&[ left | right | center ]

• =[ first | last ]? baseline
• = unsafe | safe
• = center | start | end | self-start | self-end | flex-start | flex-end

此属性可以采用四种不同的形式之一：

• 关键词：关键字 normal，auto，或 stretch 任选其一。
• 基线对齐：关键词 baseline ，可选 first 或 last 之一为前缀。
• 位置对齐：关键词 center，start，end，flex-start，flex-end，self-start，self-end，left 或 right 任选其一，可选 safe 或 unsafe 之一为前缀。
• legacy alignment：legacy 关键字，后跟 left 或 right 之一。

取值

auto使用的值是父元素的justify-items属性的值，除非该方框没有父元素，或者是绝对定位的，在这些情况下，auto代表normal。normal这个关键字的效果取决于我们所处的布局模式：

• 在块级布局中，相当于是start。
• In absolutely-positioned layouts, the keyword behaved like start on replaced absolutely-positioned boxes, and as stretch on all other absolutely-positioned boxes.
• In table cell layouts, this keyword has no meaning as this property is ignored.
• In flexbox layouts, this keyword has no meaning as this property is ignored.
• In grid layouts, this keyword leads to a behavior similar to the one of stretch, except for boxes with an aspect ratio or an intrinsic sizes where it behaves like start.

startThe item is packed flush to each other toward the start edge of the alignment container in the appropriate axis.endThe item is packed flush to each other toward the end edge of the alignment container in the appropriate axis.flex-startFor items that are not children of a flex container, this value is treated like start.flex-endFor items that are not children of a flex container, this value is treated like end.self-startThe item is packed flush to the edge of the alignment container of the start side of the item, in the appropriate axis.self-endThe item is packed flush to the edge of the alignment container of the end side of the item, in the appropriate axis.centerThe items are packed flush to each other toward the center of the of the alignment container.leftThe items are packed flush to each other toward the left edge of the alignment container. If the property’s axis is not parallel with the inline axis, this value behaves like start.rightThe items are packed flush to each other toward the right edge of the alignment container in the appropriate axis. If the property’s axis is not parallel with the inline axis, this value behaves like start.baseline
first baseline
last baselineSpecifies participation in first- or last-baseline alignment: aligns the alignment baseline of the box’s first or last baseline set with the corresponding baseline in the shared first or last baseline set of all the boxes in its baseline-sharing group.
The fallback alignment for first baseline is start, the one for last baseline is end.stretchIf the combined size of the items is less than the size of the alignment container, any auto-sized items have their size increased equally(not proportionally), while still respecting the constraints imposed by max-height/max-width(or equivalent functionality), so that the combined size exactly fills the alignment container.safeIf the size of the item overflows the alignment container, the item is instead aligned as if the alignment mode were start.unsafeRegardless of the relative sizes of the item and alignment container, the given alignment value is honored.legacyMakes the value inherited by the box descendants. Note that if a descendant has a justify-self: auto value, the legacy keyword is not considered by the descend, only the left,right, or center value associated to it.

默认值	legacy
适用于	所有元素
继承性	无
动画性	visual
计算值	指定值

例子

justify-items: stretch;
justify-items: center;
justify-items: start;
justify-items: end;

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