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ColPicker

Use multi-column picker for cascading selection, providing better interaction experience. The multi-column picker supports unlimited level selection.

::: tip Note Multi-column picker is commonly used for selecting provinces, cities, and districts. We use Vant's China province, city, and district data as the data source. You can install the @vant/area-data npm package to import it:

# via npm
npm i @vant/area-data

# via yarn
yarn add @vant/area-data

# via pnpm
pnpm add @vant/area-data

# via Bun
bun add @vant/area-data

:::

To facilitate developers using @vant/area-data for development and debugging, we have encapsulated useColPickerData. You can directly use useColPickerData to get the data source. ::: details useColPickerData wrapper based on @vant/area-data

// You can place this code in src/hooks/useColPickerData.ts in your project
import { useCascaderAreaData } from '@vant/area-data'

export type CascaderOption = {
  text: string
  value: string
  children?: CascaderOption[]
}

/**
 * Use '@vant/area-data' as data source to construct ColPicker component data
 * @returns
 */
export function useColPickerData() {
  // '@vant/area-data' data source
  const colPickerData: CascaderOption[] = useCascaderAreaData()

  // Find child nodes by code, return all nodes if no code provided
  function findChildrenByCode(data: CascaderOption[], code?: string): CascaderOption[] | null {
    if (!code) {
      return data
    }
    for (const item of data) {
      if (item.value === code) {
        return item.children || null
      }
      if (item.children) {
        const childrenResult = findChildrenByCode(item.children, code)
        if (childrenResult) {
          return childrenResult
        }
      }
    }
    return null
  }

  return { colPickerData, findChildrenByCode }
}

:::

Basic Usage

label sets the left text content;

columns sets the data source, which is a two-dimensional array. Each column is a one-dimensional array, and each option includes value (option value) and label (option name).

v-model sets the selected value, which is an array;

You can also listen to the change event to get the selected value. The event is an object containing two properties: value (selected value array) and selectedItems (selected item object array).

Pass in the column-change property, which is of type function and receives an options object parameter. The structure of options is as follows:

Parameter	Type	Description	Version
selectedItem	object	Currently selected item in the column, data structure is consistent with the options in columns	-
index	number	Current column index	-
rowIndex	number	Current column selected item index	-
resolve	function	Receives the option array for the next column	-
finish	function	End picker selection, if cannot close normally like data fetch failure, execute `finish(false)`	-

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" @confirm="handleConfirm"></wd-col-picker>

// useColPickerData can be referenced from the introduction at the top of this section
// Adjust the import path according to your actual situation, don't just copy and paste
import { useColPickerData } from '@/hooks/useColPickerData'
const { colPickerData, findChildrenByCode } = useColPickerData()

const value = ref<string[]>([])

const area = ref<any[]>([
  colPickerData.map((item) => {
    return {
      value: item.value,
      label: item.text
    }
  })
])

const columnChange = ({ selectedItem, resolve, finish }) => {
  const areaData = findChildrenByCode(colPickerData, selectedItem.value)
  if (areaData && areaData.length) {
    resolve(
      areaData.map((item) => {
        return {
          value: item.value,
          label: item.text
        }
      })
    )
  } else {
    finish()
  }
}

function handleConfirm({ value }) {
  console.log(value)
}

Asynchronous Loading

Generally, column-change is an asynchronous data fetching operation. When column-change is triggered, the component will have a default loading state, which is closed after the data responds.

If the asynchronous data request fails, call finish(false).

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" @confirm="handleConfirm"></wd-col-picker>

// useColPickerData can be referenced from the introduction at the top of this section
// Adjust the import path according to your actual situation, don't just copy and paste
import { useColPickerData } from '@/hooks/useColPickerData'
const { colPickerData, findChildrenByCode } = useColPickerData()

const value = ref<string[]>([])
const area = ref<any[]>([
  colPickerData.map((item) => {
    return {
      value: item.value,
      label: item.text
    }
  })
])

const columnChange = ({ selectedItem, resolve, finish }) => {
  // Simulate asynchronous request
  setTimeout(() => {
    // Simulate request failure
    if (Math.random() > 0.7) {
      finish(false)
      toast.error('Data request failed, please try again')
      return
    }
    // Why use selectedItem.value as code? Because when constructing area, we put the identifier in the value field, similarly you can change it to other fields as long as they correspond to area's fields
    const areaData = findChildrenByCode(colPickerData, selectedItem.value)
    if (areaData && areaData.length) {
      resolve(
        areaData.map((item) => {
          return {
            value: item.value,
            label: item.text
          }
        })
      )
    } else {
      // When there are no more items, complete the operation
      finish()
    }
  }, 300)
}

function handleConfirm({ value }) {
  console.log(value)
}

Initial Options

There are two ways to set initial options:

When setting initial options, the length of the columns array should match the length of the value array, and each value in value must be found in columns.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange"></wd-col-picker>

// useColPickerData can be referenced from the introduction at the top of this section
// Adjust the import path according to your actual situation, don't just copy and paste
import { useColPickerData } from '@/hooks/useColPickerData'
const { colPickerData, findChildrenByCode } = useColPickerData()

const value = ref<string[]>(['110000', '110100', '110101'])

const area = ref<any[]>([
  colPickerData.map((item) => {
    return {
      value: item.value,
      label: item.text
    }
  }),
  findChildrenByCode(colPickerData, '110000')!.map((item) => {
    return {
      value: item.value,
      label: item.text
    }
  }),
  findChildrenByCode(colPickerData, '110100')!.map((item) => {
    return {
      value: item.value,
      label: item.text
    }
  })
])

const columnChange = ({ selectedItem, resolve, finish, index }) => {
  const areaData = findChildrenByCode(colPickerData, selectedItem.value)
  if (areaData && areaData.length) {
    resolve(
      areaData.map((item) => {
        return {
          value: item.value,
          label: item.text
        }
      })
    )
  } else {
    finish()
  }
}

Use the auto-complete attribute. When auto-complete is true, the component will automatically trigger the column-change event to complete the data.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" auto-complete></wd-col-picker>

// useColPickerData can be referenced from the introduction at the top of this section
// Adjust the import path according to your actual situation, don't just copy and paste
import { useColPickerData } from '@/hooks/useColPickerData'
const { colPickerData, findChildrenByCode } = useColPickerData()

const value = ref<string[]>(['110000', '110100', '110101'])

const area = ref<any[]>([
  colPickerData.map((item) => {
    return {
      value: item.value,
      label: item.text
    }
  })
])

const columnChange = ({ selectedItem, resolve, finish }) => {
  const areaData = findChildrenByCode(colPickerData, selectedItem.value)
  if (areaData && areaData.length) {
    resolve(
      areaData.map((item) => {
        return {
          value: item.value,
          label: item.text
        }
      })
    )
  } else {
    finish()
  }
}

Disabled

Set disabled to disable the picker.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" disabled></wd-col-picker>

Readonly

Set readonly to make the picker readonly.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" readonly></wd-col-picker>

Disabled Options

Set the disabled property in option data to disable specific options.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange"></wd-col-picker>

const area = ref<any[]>([
  [
    { value: '1', label: 'Beijing', disabled: true },
    { value: '2', label: 'Shanghai' },
    { value: '3', label: 'Shenzhen' }
  ]
])

const columnChange = ({ selectedItem, resolve, finish }) => {
  if (selectedItem.value === '1') {
    resolve([
      { value: '11', label: 'Dongcheng District' },
      { value: '12', label: 'Xicheng District' }
    ])
  } else if (selectedItem.value === '2') {
    resolve([
      { value: '21', label: 'Huangpu District' },
      { value: '22', label: 'Xuhui District' }
    ])
  } else {
    finish()
  }
}

Option Tips

Set the tip property in option data to show tips for options.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange"></wd-col-picker>

const area = ref<any[]>([
  [
    { value: '1', label: 'Beijing', tip: 'Capital' },
    { value: '2', label: 'Shanghai', tip: 'Municipality' },
    { value: '3', label: 'Shenzhen', tip: 'Special Economic Zone' }
  ]
])

const columnChange = ({ selectedItem, resolve, finish }) => {
  if (selectedItem.value === '1') {
    resolve([
      { value: '11', label: 'Dongcheng District' },
      { value: '12', label: 'Xicheng District' }
    ])
  } else if (selectedItem.value === '2') {
    resolve([
      { value: '21', label: 'Huangpu District' },
      { value: '22', label: 'Xuhui District' }
    ])
  } else {
    finish()
  }
}

Display Format

Set display-format to customize the display text.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" :display-format="displayFormat"></wd-col-picker>

const displayFormat = (items) => {
  return items.map((item) => item.label).join(' > ')
}

Set Title

Set title to customize the popup title.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" title="Select Region"></wd-col-picker>

Before Confirm

Set before-confirm to validate before confirming.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" :before-confirm="beforeConfirm"></wd-col-picker>

const beforeConfirm = (value, resolve) => {
  if (value.length < 3) {
    toast.error('Please select a complete address')
    resolve(false)
  } else {
    resolve(true)
  }
}

Error State

Set error to show error state.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" error></wd-col-picker>

Required Style

Set required to show required asterisk.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" required></wd-col-picker>

Required Marker Position

Set marker-side to control the position of the required marker.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" required marker-side="after"></wd-col-picker>

Picker Size

Set size to change picker size.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" size="large"></wd-col-picker>

Right Align Value

Set align-right to right-align the picker value.

<wd-col-picker label="Select Address" v-model="value" :columns="area" :column-change="columnChange" align-right></wd-col-picker>

Custom Picker

Use slots to customize the picker display.

<wd-col-picker v-model="value" :columns="area" :column-change="columnChange" use-default-slot>
  <wd-cell title="Select Address" :value="value.length ? displayFormat(selectedItems) : 'Please select'" is-link></wd-cell>
</wd-col-picker>

const selectedItems = ref([])

const displayFormat = (items) => {
  return items.map((item) => item.label).join(' > ')
}

const handleConfirm = ({ selectedItems: items }) => {
  selectedItems.value = items
}

Attributes

Attribute	Description	Type	Options	Default	Version
v-model	Selected value	array	-	-	-
columns	Picker data, 2D array	array	-	-	-
value-key	Key for the `value` property in option objects	string	-	value	-
label-key	Key for the `label` property in option objects	string	-	label	-
tip-key	Key for the `tip` property in option objects	string	-	tip	-
title	Popup title	string	-	-	-
label	Left-side text label	string	-	-	-
placeholder	Placeholder text	string	-	Select	-
disabled	Disabled state	boolean	-	false	-
readonly	Readonly state	boolean	-	false	-
display-format	Custom display text formatting function (returns a string)	function	-	-	-
column-change	Function to handle column changes, receives current column's selected item, column index, selected item index, next column data handler resolve, and finish selection function	function	-	-	-
size	Picker size	string	large	-	-
label-width	Left-side label width	string	-	33%	-
error	Error state (displays value in red)	boolean	-	false	-
required	Whether to display the required asterisk	boolean	-	false	-
marker-side	Position of the required marker	string	before / after	before	1.12.0
align-right	Right-align the picker value	boolean	-	false	-
before-confirm	Validation function before confirming, receives (value, resolve) parameters, continue execution through resolve, resolve accepts 1 boolean parameter	function	-	-	-
loading-color	Loading icon color	string	-	#4D80F0	-
use-default-slot	Set this option when using default slot	boolean	-	false	-
use-label-slot	Set this option when using label slot	boolean	-	false	-
close-on-click-modal	Whether to close when clicking modal	boolean	-	true	-
auto-complete	Automatically trigger column-change event to complete data, triggers column-change when columns is empty array or columns array length is less than value array length	boolean	-	false	-
z-index	Popup z-index	number	-	15	-
safe-area-inset-bottom	Whether to enable bottom safe area adaptation for popup panel (iPhone X type models)	boolean	-	true	-
ellipsis	Whether to hide overflow	boolean	-	false	-
prop	Form field `model` property name, required when using form validation	string	-	-	-
rules	Form validation rules, used with `wd-form` component	`FormItemRule []`	-	`[]`	-
lineWidth	Bottom line width in pixels	number	-	-	1.3.7
lineHeight	Bottom line height in pixels	number	-	-	1.3.7
root-portal	Whether to detach from the page, used to solve various fixed positioning issues	boolean	-	false	1.11.0

FormItemRule Data Structure

Key	Description	Type
required	Whether it's a required field	`boolean`
message	Error message	`string`
validator	Validation through function, can return a `Promise` for async validation	`(value, rule) => boolean \| Promise`
pattern	Validation through regular expression, regex mismatch indicates validation failure	`RegExp`

Option Data Structure

Key	Description	Type	Required	Version
value	Option value	string	Yes	-
label	Option name	string	Yes	-
tip	Option tip	string	No	-
disabled	Disable option	boolean	No	-

Events

Event Name	Description	Parameters	Version
confirm	Triggered when the last column option is selected	`{ value(option value array), selectedItems(option array) }`	-
close	Triggered when close button or overlay is clicked	-	-

Methods

Method Name	Description	Parameters	Version
open	Open picker popup	-	-
close	Close picker popup	-	-

Slots

Name	Description	Version
default	Custom display	-
label	Left slot	-

External Style Classes

Class Name	Description	Version
custom-class	Root node style	-
custom-label-class	Label external custom style	-
custom-value-class	Value external custom style	-

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