83 lines
3.9 KiB
Markdown
83 lines
3.9 KiB
Markdown
---
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category: Components
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type: Data Entry
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title: Cascader
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cover: https://gw.alipayobjects.com/zos/alicdn/UdS8y8xyZ/Cascader.svg
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---
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Cascade selection box.
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## When To Use
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- When you need to select from a set of associated data set. Such as province/city/district, company level, things classification.
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- When selecting from a large data set, with multi-stage classification separated for easy selection.
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- Chooses cascade items in one float layer for better user experience.
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## API
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```html
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<a-cascader :options="options" v-model:value="value" />
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```
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| Property | Description | Type | Default |
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| --- | --- | --- | --- |
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| allowClear | whether allow clear | boolean | true |
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| autofocus | get focus when component mounted | boolean | false |
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| changeOnSelect | change value on each selection if set to true, see above demo for details | boolean | false |
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| defaultValue | initial selected value | string\[] \| number\[] | \[] |
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| disabled | whether disabled select | boolean | false |
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| displayRender | render function of displaying selected options, you can use #displayRender="{labels, selectedOptions}" | `({labels, selectedOptions}) => VNode` | `labels => labels.join(' / ')` |
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| expandTrigger | expand current item when click or hover, one of 'click' 'hover' | string | 'click' |
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| fieldNames | custom field name for label and value and children | object | `{ label: 'label', value: 'value', children: 'children' }` |
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| getPopupContainer | Parent Node which the selector should be rendered to. Default to `body`. When position issues happen, try to modify it into scrollable content and position it relative. | Function(triggerNode) | () => document.body |
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| loadData | To load option lazily, and it cannot work with `showSearch` | `(selectedOptions) => void` | - |
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| notFoundContent | Specify content to show when no result matches. | string | 'Not Found' |
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| options | data options of cascade | [Option](#option)[] | - |
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| placeholder | input placeholder | string | 'Please select' |
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| popupClassName | additional className of popup overlay | string | - |
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| popupStyle | additional style of popup overlay | object | {} |
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| popupPlacement | use preset popup align config from builtinPlacementsīŧ`bottomLeft` `bottomRight` `topLeft` `topRight` | string | `bottomLeft` |
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| popupVisible | set visible of cascader popup | boolean | - |
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| showSearch | Whether show search input in single mode. | boolean \| [object](#showsearch) | false |
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| size | input size, one of `large` `default` `small` | string | `default` |
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| suffixIcon | The custom suffix icon | string \| VNode \| slot | - |
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| value(v-model) | selected value | string\[] \| number\[] | - |
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### showSearch
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Fields in `showSearch`:
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| Property | Description | Type | Default |
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| --- | --- | --- | --- |
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| filter | The function will receive two arguments, inputValue and option, if the function returns true, the option will be included in the filtered set; Otherwise, it will be excluded. | `function(inputValue, path): boolean` | |
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| limit | Set the count of filtered items | number \| false | 50 |
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| matchInputWidth | Whether the width of result list equals to input's | boolean | |
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| render | Used to render filtered options, you can use #showSearchRender="{inputValue, path}" | `function({inputValue, path}): VNode` | |
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| sort | Used to sort filtered options. | `function(a, b, inputValue)` | |
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### events
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| Events Name | Description | Arguments | version |
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| --- | --- | --- | --- | --- |
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| change | callback when finishing cascader select | `(value, selectedOptions) => void` | - | |
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| popupVisibleChange | callback when popup shown or hidden | `(value) => void` | - | |
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| search | callback when input value change | `(value) => void` | - | 1.5.4 |
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### Option
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```ts
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interface Option {
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value: string | number;
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label?: VNode;
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disabled?: boolean;
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children?: Option[];
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}
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```
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## Methods
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| Name | Description |
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| ------- | ------------ |
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| blur() | remove focus |
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| focus() | get focus |
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