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## API
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````html
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<a-cascader :options="options" @change="onChange" />
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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\[] | \[] |
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| disabled | whether disabled select | boolean | false |
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| displayRender | render function of displaying selected options, you can use slot="displayRender" and slot-scope="{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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| 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 | object | - |
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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 builtinPlacements：`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 | false |
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| size | input size, one of `large` `default` `small` | string | `default` |
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| value(v-model) | selected value | string\[] | - |
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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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| 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 slot="showSearchRender" and slot-scope="{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 |
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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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## 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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