Cascader 级联选择
级联选择框。
何时使用
- 需要从一组相关联的数据集合进行选择,例如省市区,公司层级,事物分类等。
- 从一个较大的数据集合中进行选择时,用多级分类进行分隔,方便选择。
比起 Select 组件,可以在同一个浮层中完成选择,有较好的体验。
代码演示
基本
省市区级联。
<template>
<a-cascader :options="options" placeholder="Please select" @change="onChange" />
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
},
};
</script>
Zhejiang / Hangzhou / West Lake (752100) **
自定义已选项
例如给最后一项加上邮编链接。
<template>
<a-cascader
:options="options"
:default-value="['zhejiang', 'hangzhou', 'xihu']"
style="width: 100%"
>
<template slot="displayRender" slot-scope="{ labels, selectedOptions }">
<span v-for="(label, index) in labels" :key="selectedOptions[index].value">
<span v-if="index === labels.length - 1">
{{ label }} (<a @click="e => handleAreaClick(e, label, selectedOptions[index])">{{
selectedOptions[index].code
}}</a
>)
</span>
<span v-else @click="onChange"> {{ label }} / </span>
</span>
</template>
</a-cascader>
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
code: 752100,
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
code: 453400,
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
handleAreaClick(e, label, option) {
e.stopPropagation();
console.log('clicked', label, option);
},
},
};
</script>
Zhejiang / Hangzhou / West Lake**
默认值
默认值通过数组的方式指定。
<template>
<a-cascader
:options="options"
:default-value="['zhejiang', 'hangzhou', 'xihu']"
@change="onChange"
/>
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
},
};
</script>
移入展开
通过移入展开下级菜单,点击完成选择。
<template>
<a-cascader
:options="options"
:display-render="displayRender"
expand-trigger="hover"
placeholder="Please select"
@change="onChange"
/>
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
displayRender({ labels }) {
return labels[labels.length - 1];
},
},
};
</script>
搜索
可以直接搜索选项并选择。
Cascader[showSearch]
暂不支持服务端搜索,更多信息见 #5547
<template>
<a-cascader
:options="options"
:show-search="{ filter }"
placeholder="Please select"
@change="onChange"
/>
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
{
value: 'xiasha',
label: 'Xia Sha',
disabled: true,
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua men',
},
],
},
],
},
],
};
},
methods: {
onChange(value, selectedOptions) {
console.log(value, selectedOptions);
},
filter(inputValue, path) {
return path.some(option => option.label.toLowerCase().indexOf(inputValue.toLowerCase()) > -1);
},
},
};
</script>
自定义字段名
自定义字段名。
<template>
<a-cascader
:field-names="{ label: 'name', value: 'code', children: 'items' }"
:options="options"
placeholder="Please select"
@change="onChange"
/>
</template>
<script>
const options = [
{
code: 'zhejiang',
name: 'Zhejiang',
items: [
{
code: 'hangzhou',
name: 'Hangzhou',
items: [
{
code: 'xihu',
name: 'West Lake',
},
],
},
],
},
{
code: 'jiangsu',
name: 'Jiangsu',
items: [
{
code: 'nanjing',
name: 'Nanjing',
items: [
{
code: 'zhonghuamen',
name: 'Zhong Hua Men',
},
],
},
],
},
];
export default {
data() {
return {
options,
};
},
methods: {
onChange(value) {
console.log(value);
},
},
};
</script>
选择即改变
这种交互允许只选中父级选项。
<template>
<a-cascader :options="options" change-on-select @change="onChange" />
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
},
};
</script>
Unselect Change city
可以自定义显示
切换按钮和结果分开。
<template>
<span>
{{ text }}
<a-cascader :options="options" @change="onChange">
<a href="#">Change city</a>
</a-cascader>
</span>
</template>
<script>
export default {
data() {
return {
text: 'Unselect',
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value, selectedOptions) {
this.text = selectedOptions.map(o => o.label).join(', ');
},
},
};
</script>
禁用选项
通过指定 options 里的 disabled
字段。
<template>
<a-cascader :options="options" @change="onChange" />
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
disabled: true,
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
},
};
</script>
动态加载选项
使用 loadData
实现动态加载选项。
注意:
loadData
与showSearch
无法一起使用。
<template>
<a-cascader
:options="options"
:load-data="loadData"
placeholder="Please select"
change-on-select
@change="onChange"
/>
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
isLeaf: false,
},
{
value: 'jiangsu',
label: 'Jiangsu',
isLeaf: false,
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
loadData(selectedOptions) {
const targetOption = selectedOptions[selectedOptions.length - 1];
targetOption.loading = true;
// load options lazily
setTimeout(() => {
targetOption.loading = false;
targetOption.children = [
{
label: `${targetOption.label} Dynamic 1`,
value: 'dynamic1',
},
{
label: `${targetOption.label} Dynamic 2`,
value: 'dynamic2',
},
];
this.options = [...this.options];
}, 1000);
},
},
};
</script>
大小
不同大小的级联选择器。
<template>
<div>
<a-cascader size="large" :options="options" @change="onChange" /><br /><br />
<a-cascader :options="options" @change="onChange" /><br /><br />
<a-cascader size="small" :options="options" @change="onChange" /><br /><br />
</div>
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
},
};
</script>
后缀图标
省市区级联。
<template>
<div>
<a-cascader
style="margin-top: 1rem"
:options="options"
placeholder="Please select"
@change="onChange"
>
<a-icon slot="suffixIcon" type="smile" class="test" />
</a-cascader>
<a-cascader
suffix-icon="ab"
style="margin-top: 1rem"
:options="options"
placeholder="Please select"
@change="onChange"
/>
</div>
</template>
<script>
export default {
data() {
return {
options: [
{
value: 'zhejiang',
label: 'Zhejiang',
children: [
{
value: 'hangzhou',
label: 'Hangzhou',
children: [
{
value: 'xihu',
label: 'West Lake',
},
],
},
],
},
{
value: 'jiangsu',
label: 'Jiangsu',
children: [
{
value: 'nanjing',
label: 'Nanjing',
children: [
{
value: 'zhonghuamen',
label: 'Zhong Hua Men',
},
],
},
],
},
],
};
},
methods: {
onChange(value) {
console.log(value);
},
},
};
</script>
API
<a-cascader :options="options" @change="onChange" />
参数 | 说明 | 类型 | 默认值 |
---|---|---|---|
allowClear | 是否支持清除 | boolean | true |
autoFocus | 自动获取焦点 | boolean | false |
changeOnSelect | 当此项为 true 时,点选每级菜单选项值都会发生变化,具体见上面的演示 | boolean | false |
defaultValue | 默认的选中项 | string[] | number[] | [] |
disabled | 禁用 | boolean | false |
displayRender | 选择后展示的渲染函数,可使用 slot=”displayRender” 和 slot-scope=”{labels, selectedOptions}” | ({labels, selectedOptions}) => vNode | labels => labels.join(‘ / ‘) |
expandTrigger | 次级菜单的展开方式,可选 ‘click’ 和 ‘hover’ | string | ‘click’ |
fieldNames | 自定义 options 中 label name children 的字段 | object | { label: ‘label’, value: ‘value’, children: ‘children’ } |
getPopupContainer | 菜单渲染父节点。默认渲染到 body 上,如果你遇到菜单滚动定位问题,试试修改为滚动的区域,并相对其定位。 | Function(triggerNode) | () => document.body |
loadData | 用于动态加载选项,无法与 showSearch 一起使用 | (selectedOptions) => void | - |
notFoundContent | 当下拉列表为空时显示的内容 | string | ‘Not Found’ |
options | 可选项数据源 | object | - |
placeholder | 输入框占位文本 | string | ‘请选择’ |
popupClassName | 自定义浮层类名 | string | - |
popupStyle | 自定义浮层样式 | object | {} |
popupPlacement | 浮层预设位置:bottomLeft bottomRight topLeft topRight | Enum | bottomLeft |
popupVisible | 控制浮层显隐 | boolean | - |
showSearch | 在选择框中显示搜索框 | boolean | false |
size | 输入框大小,可选 large default small | string | default |
suffixIcon | 自定义的选择框后缀图标 | string | VNode | slot | - |
value(v-model) | 指定选中项 | string[] | number[] | - |
showSearch
为对象时,其中的字段:
参数 | 说明 | 类型 | 默认值 |
---|---|---|---|
filter | 接收 inputValue path 两个参数,当 path 符合筛选条件时,应返回 true,反之则返回 false。 | function(inputValue, path): boolean | |
limit | 搜索结果展示数量 | number | false | 50 |
matchInputWidth | 搜索结果列表是否与输入框同宽 | boolean | |
render | 用于渲染 filter 后的选项,可使用 slot=”showSearchRender” 和 slot-scope=”{inputValue, path}” | function({inputValue, path}): vNode | |
sort | 用于排序 filter 后的选项 | function(a, b, inputValue) |
事件
事件名称 | 说明 | 回调参数 | 版本 |
---|---|---|---|
change | 选择完成后的回调 | (value, selectedOptions) => void | - |
popupVisibleChange | 显示/隐藏浮层的回调 | (value) => void | - |
search | 输入框变化时的回调 | (value) => void | - |
方法
名称 | 描述 |
---|---|
blur() | 移除焦点 |
focus() | 获取焦点 |
注意,如果需要获得中国省市区数据,可以参考 react 组件的实现 china-division。