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66 lines
2.0 KiB
66 lines
2.0 KiB
3 years ago
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# 让滚动条贴附在容器边缘的实现
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日常业务中会出现滚动条,如果没有贴边显示的话,视觉效果会大打折扣.直接原因是一层又一层的布局嵌套,使得当前滚动的容器自身就已经脱离了页面区域.
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如何在不借助`padding`的情况下,让滚动条贴附在容器边缘呢?
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多层级嵌套时,避免在顶层设置gap属性
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例如常用的上面导航下面tab示例,由于外层组件设置了`hgap:10`,因此即使内部`bi.vertical`组件出现滚动条,也无法贴附在容器边缘
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因此开发过程中药尽量将gap设置下沉到具体的子组件
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```js
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const widget = {
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type: "bi.vtape",
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cls: "bi.border",
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width: 300,
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hgap: 10,
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items: [
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{
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type: "demo.nav",
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height: 36,
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},
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{
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type: "bi.tab",
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showIndex: 1,
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cardCreator: v => {
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return {
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type: "bi.vertical", // 假设这个布局会出现滚动条
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};
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},
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},
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],
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};
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```
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进行一次额外的布局包装,多一层DOM,收获一份体验
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因为vertical2没有高度,因此其会被子节点撑起高度,而后导致vertical1发生溢出,出现滚动条
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这样既实现了滚动条贴边,又保证了每一个列表项的左右间距.
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```js
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const widget3 = {
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type: "bi.vertical", // vertical1
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cls: "bi-border vertical1",
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hgap: 10,
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height: 300,
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width: 300,
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items: [
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{
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type: "bi.vertical", // vertical2,假设这个布局会出现滚动条,
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cls: "vertical2",
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items: (new Array(100)).fill(0).map((v, i) => {
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return {
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type: "bi.label",
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cls: "bi-list-item-active2",
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text: `第${i}项`,
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};
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}),
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},
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],
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};
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```
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