126 lines
7.8 KiB
Markdown
126 lines
7.8 KiB
Markdown
---
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category: Components
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type: Data Entry
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title: Select
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cover: https://gw.alipayobjects.com/zos/alicdn/_0XzgOis7/Select.svg
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---
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Select component to select value from options.
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## When To Use
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- A dropdown menu for displaying choices - an elegant alternative to the native `<select>` element.
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- Utilizing [Radio](/components/radio/) is recommended when there are fewer total options (less than 5).
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## API
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```html
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<a-select>
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<a-select-option value="lucy">lucy</a-select-option>
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</a-select>
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```
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### Select props
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| Property | Description | Type | Default | Version |
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| --- | --- | --- | --- | --- |
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| allowClear | Show clear button. | boolean | false | |
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| autoClearSearchValue | Whether the current search will be cleared on selecting an item. Only applies when `mode` is set to `multiple` or `tags`. | boolean | true | |
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| autofocus | Get focus by default | boolean | false | |
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| bordered | Whether has border style | boolean | true | |
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| clearIcon | The custom clear icon | VNode \| slot | - | |
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| defaultActiveFirstOption | Whether active first option by default | boolean | true | |
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| defaultOpen | Initial open state of dropdown | boolean | - | |
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| disabled | Whether disabled select | boolean | false | |
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| dropdownClassName | className of dropdown menu | string | - | |
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| dropdownMatchSelectWidth | Determine whether the dropdown menu and the select input are the same width. Default set `min-width` same as input. Will ignore when value less than select width. `false` will disable virtual scroll | boolean \| number | true | |
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| dropdownMenuStyle | additional style applied to dropdown menu | object | - | |
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| dropdownRender | Customize dropdown content | ({menuNode: VNode, props}) => VNode \| v-slot | - | |
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| dropdownStyle | style of dropdown menu | object | - | |
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| fieldNames | Customize node label, value, options field name | object | { label: `label`, value: `value`, options: `options` } | 3.0 |
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| filterOption | If true, filter options by input, if function, filter options against it. 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. | `boolean` \| `function(inputValue, option)` | true | |
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| filterSort | Sort function for search options sorting, see [Array.sort](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort)'s compareFunction | (optionA: Option, optionB: Option) => number | - | 3.0 |
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| firstActiveValue | Value of action option by default | string\|string\[] | - | |
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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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| labelInValue | whether to embed label in value, turn the format of value from `string` to `{key: string, label: vNodes, originLabel: any}`, originLabel (3.1) maintains the original type. If the node is constructed through a-select-option children, the value is a function (the default slot of a-select-option) | boolean | false | |
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| listHeight | Config popup height | number | 256 | |
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| loading | indicate loading state | Boolean | false | |
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| maxTagCount | Max tag count to show | number | - | |
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| maxTagPlaceholder | Placeholder for not showing tags | slot/function(omittedValues) | - | |
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| maxTagTextLength | Max text length to show | number | - | |
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| menuItemSelectedIcon | The custom menuItemSelected icon | VNode \| slot | - | |
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| mode | Set mode of Select | 'multiple' \| 'tags' | - | |
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| notFoundContent | Specify content to show when no result matches.. | string\|slot | 'Not Found' | |
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| open | Controlled open state of dropdown | boolean | - | |
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| option | custom render option by slot | v-slot:option="{value, label, [disabled, key, title]}" | - | 2.2.5 |
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| optionFilterProp | Which prop value of option will be used for filter if filterOption is true | string | value | |
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| optionLabelProp | Which prop value of option will render as content of select. | string | `children` \| `label`(when use options) | |
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| options | Data of the selectOption, manual construction work is no longer needed if this property has been set | array<{value, label, [disabled, key, title]}> | \[] | |
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| placeholder | Placeholder of select | string\|slot | - | |
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| removeIcon | The custom remove icon | VNode \| slot | - | |
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| searchValue | The current input "search" text | string | - | |
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| showArrow | Whether to show the drop-down arrow | boolean | true | |
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| showSearch | Whether show search input in single mode. | boolean | false | |
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| size | Size of Select input. `default` `large` `small` | string | default | |
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| suffixIcon | The custom suffix icon | VNode \| slot | - | |
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| tagRender | Customize tag render, only applies when `mode` is set to `multiple` or `tags` | slot \| (props) => any | - | |
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| tokenSeparators | Separator used to tokenize on tag/multiple mode | string\[] | | |
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| value(v-model) | Current selected option. | string\|number\|string\[]\|number\[] | - | |
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| virtual | Disable virtual scroll when set to false | boolean | true | 3.0 |
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> Note, if you find that the drop-down menu scrolls with the page, or you need to trigger Select in other popup layers, please try to use `getPopupContainer={triggerNode => triggerNode.parentElement}` to fix the drop-down popup rendering node in the parent element of the trigger .
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### events
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| Events Name | Description | Arguments |
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| --- | --- | --- |
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| blur | Called when blur | function |
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| change | Called when select an option or input value change, or value of input is changed in combobox mode | function(value, option:Option/Array<Option>) |
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| deselect | Called when a option is deselected, the params are option's value (or key) . only called for multiple or tags, effective in multiple or tags mode only. | function(value, option:Option) |
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| dropdownVisibleChange | Call when dropdown open | function(open) |
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| focus | Called when focus | function |
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| inputKeyDown | Called when key pressed | function |
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| mouseenter | Called when mouse enter | function |
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| mouseleave | Called when mouse leave | function |
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| popupScroll | Called when dropdown scrolls | function |
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| search | Callback function that is fired when input changed. | function(value: string) |
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| select | Called when a option is selected, the params are option's value (or key) and option instance. | function(value, option:Option) |
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### Select 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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### Option props
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| Property | Description | Type | Default |
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| --- | --- | --- | --- |
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| class | additional class to option | string | - |
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| disabled | Disable this option | boolean | false |
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| key | Same usage as `value`. If Vue request you to set this property, you can set it to value of option, and then omit value property. | string | |
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| title | `title` of Select after select this Option | string | - |
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| value | default to filter with this property | string\|number | - |
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### OptGroup props
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| Property | Description | Type | Default |
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| -------- | ----------- | ------------ | ------- |
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| key | | string | - |
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| label | Group label | string\|slot | - |
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## FAQ
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### The dropdown is closed when click `dropdownRender` area?
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See the [dropdownRender example](/components/select/#components-select-demo-custom-dropdown).
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### Why is `placeholder` not displayed?
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`placeholder` will only be displayed when `value = undefined`, and other values such as null, 0,'', etc. are meaningful values for the JS language.
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You can check [JS Language Specification](https://262.ecma-international.org/5.1/#sec-4.3.9) for further details.
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You can also check [antd issue](https://github.com/ant-design/ant-design/issues/2367) to view the discussion.
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