Picker Selector

The Picker component is a combination of popup and pickerView.

Basic Usage

Set the columns property to configure the option data source. Options can be strings or objects. If they are objects, the label property is used by default for rendering the option content. The label property sets the left-side text content, and v-model sets the selected value. The label can be omitted. The title width can be set via label-width, which defaults to '33%'. Listen to the confirm event to get the selected value, which returns an event object: event = { value, selectedItems }. value is the bound value, and selectedItems is the selected option object(s).

<wd-picker :columns="columns" label="Single Column" v-model="value" @confirm="handleConfirm" />

const columns = ref(['Option 1', 'Option 2', 'Option 3', 'Option 4', 'Option 5', 'Option 6', 'Option 7'])
const value = ref('Option 1')

function handleConfirm({ value }) {
  value.value = value
}

When columns options are objects, their data structure is as follows:

Parameter	Type	Description	Minimum Version
value	string / number / boolean	Option value. If the value property is missing, label is used as the value.	-
label	string	Option text content	-
disabled	boolean	Whether the option is disabled	-

Disabled

Set the disabled property.

<wd-picker :columns="columns" label="Disabled" v-model="value" disabled />

const value = ref('Option 3')

const columns = ref(['Option 1', 'Option 2', 'Option 3', 'Option 4', 'Option 5', 'Option 6', 'Option 7'])

Readonly

Set the readonly property.

<wd-picker :columns="columns" label="Readonly" v-model="value" readonly />

Clear Button

Set the clearable property.

<wd-picker :columns="columns" label="Clear" v-model="value" clearable />

Title

Set the title property.

<wd-picker label="Title" :columns="columns" title="Picker Title"/>

Loading

Set the loading property.

<wd-picker-view :columns="columns" loading />

Multiple Columns

Set the columns property as a two-dimensional array, and value as an array.

<wd-picker :columns="columns" label="Multiple Columns" v-model="value" />

const value = ref(['Central South University', 'Software Engineering'])

const columns = ref([
  ['Sun Yat-sen University', 'Central South University', 'South China University of Technology'],
  ['Computer Science', 'Software Engineering', 'Communication Engineering', 'Law', 'Economics']
])

Cascading

Pass the column-change property, which is a function that receives the pickerView instance, selected item, current column index, and resolve as parameters. Based on the selected item and column index, modify the data source of other columns using the setColumnData method exposed by the pickerView instance. After modification, call resolve() to notify the component that the modification is complete. If column-change contains asynchronous operations, the component will execute them in order.

resolve() must be called after each modification.

<wd-picker
  :columns="columns"
  label="Cascading"
  v-model="value"
  :column-change="onChangeDistrict"
  :display-format="displayFormat"
 />

const district = {
  '0': [{ label: 'Beijing', value: '110000' }, { label: 'Guangdong', value: '440000' }],
  '110000': [{ label: 'Beijing', value: '110100' }],
  '440000': [{ label: 'Guangzhou', value: '440100' }, { label: 'Shaoguan', value: '440200' }, { label: 'Shenzhen', value: '440300' }, { label: 'Zhuhai', value: '440400' }, { label: 'Shantou', value: '440500' }],
  '110100': [{ label: 'Dongcheng District', value: '110101' }, { label: 'Xicheng District', value: '110102' }, { label: 'Chaoyang District', value: '110105' }, { label: 'Fengtai District', value: '110106' }, { label: 'Shijingshan District', value: '110107' }],
  '440100': [{ label: 'Liwan District', value: '440103' }, { label: 'Yuexiu District', value: '440104' }, { label: 'Haizhu District', value: '440105'}],
  '440200': [{ label: 'Wujiang District', value: '440203'}],
  '440300': [{ label: 'Luohu District', value: '440303' }, { label: 'Futian District', value: '440304' }],
  '440400': [{ label: 'Xiangzhou District', value: '440402' }, { label: 'Doumen District', value: '440403' }, { label: 'Jinwan District', value: '440404' }],
  '440500': [{ label: 'Longhu District', value: '440507' }, { label: 'Jinping District', value: '440511' }]
}

const value = ref(['110000', '110100', '110102'])

const columns = ref([district[0], district[district[0][0].value], district[district[district[0][0].value][0].value]])

const onChangeDistrict = (pickerView, value, columnIndex, resolve) => {
  const item = value[columnIndex]
  if (columnIndex === 0) {
    pickerView.setColumnData(1, district[item.value])
    pickerView.setColumnData(2, district[district[item.value][0].value])
  } else if (columnIndex === 1) {
    pickerView.setColumnData(2, district[item.value])
  }
  resolve()
}

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

Picker Size

Modify the picker size by setting size. When size is set to 'large', the font size becomes 16px.

<wd-picker label="Single Column" size="large" v-model="value" :columns="columns" />

Required

Set the required property to display the required style.

<wd-picker label="Required" error :columns="columns" v-model="value" required/>

Error State

Set the error property to display the picker value in red.

<wd-picker label="Single Column" error :columns="columns" v-model="value"/>

Right-Aligned Value

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

<wd-picker label="Single Column" align-right :columns="columns" v-model="value"/>

Pre-Confirmation Validation

Set the before-confirm function. When the user clicks the "Confirm" button, the before-confirm function is executed, receiving value, resolve, and picker parameters. You can validate value and notify the component whether the validation passes via resolve. resolve accepts a boolean value: resolve(true) indicates validation passes, while resolve(false) indicates validation fails (the picker popup will not close). Properties like loading and columns can be directly set via the picker parameter.

<wd-toast />

<wd-picker label="Before Confirm" :columns="columns" v-model="value" :before-confirm="beforeConfirm" @confirm="handleConfirm" />

import { useToast } from '@/uni_modules/wot-design-uni'

const toast = useToast()

const beforeConfirm = (value, resolve, picker) => {
  picker.setLoading(true)
  setTimeout(() => {
    picker.setLoading(false)
    if (['Option 2', 'Option 3'].indexOf(value) > -1) {
      resolve(false)
      toast.error('Validation failed. Please reselect.')
    } else {
      resolve(true)
    }
  }, 2000)
}

const columns = ref(['Option 1', 'Option 2', 'Option 3', 'Option 4', 'Option 5', 'Option 6', 'Option 7'])
const value = ref('')

const beforeConfirm = (value, resolve, picker) => {
  picker.setLoading(true)
  setTimeout(() => {
    picker.setLoading(false)
    if (['Option 2', 'Option 3'].indexOf(value) > -1) {
      resolve(false)
      toast.error('Validation failed. Please reselect.')
    } else {
      resolve(true)
    }
  }, 2000)
}

function handleConfirm({ value }) {
  value.value = value
}

Trigger Slot

Enable use-default-slot and use the default slot to customize the picker trigger component.

<wd-picker :columns="columns" v-model="value" use-default-slot>
  <wd-button>Slot Trigger</wd-button>
</wd-picker>

Attributes

Parameter	Description	Type	Options	Default	Minimum Version
v-model	Selected value. For multi-column pickers, this should be an array.	string/number/boolean/array	-	-	-
columns	Picker data. Can be an array of strings or objects. If a 2D array, it becomes a multi-column picker.	array	-	-	-
loading	Loading state	boolean	-	false	-
loading-color	Loading color (hexadecimal format, no shorthand).	string	-	#4D80F0	-
columns-height	Internal picker roller height	number	-	231	-
value-key	Key for the value property in option objects	string	-	value	-
label-key	Key for the label property in option objects	string	-	label	-
title	Popup title	string	-	-	-
cancel-button-text	Cancel button text	string	-	Cancel	-
confirm-button-text	Confirm button text	string	-	Confirm	-
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 pickerView instance, selected item, column index, and resolve)	function	-	-	-
size	Picker size	string	large	-	-
label-width	Left-side label width	string	-	33%	-
error	Error state (displays value in red)	boolean	-	false	-
required	Required field style	boolean	-	false	-
align-right	Right-align the picker value	boolean	-	false	-
use-label-slot	Use label slot	boolean	-	false	-
use-default-slot	Use default slot	boolean	-	false	-
before-confirm	Pre-confirmation validation function (receives value, resolve, picker)	function	-	-	-
close-on-click-modal	Close popup when clicking the mask	boolean	-	true	-
z-index	Popup z-index	number	-	15	-
safe-area-inset-bottom	Enable bottom safe area for iPhone X-type devices	boolean	-	true	-
ellipsis	Enable text overflow ellipsis	boolean	-	false	-
prop	Form model field name (required for form validation)	string	-	-	-
rules	Form validation rules (used with wd-form)	FormItemRule []	-	[]	-
immediate-change	Trigger picker-view change event immediately on touch release (supported in WeChat Mini Program and Alipay Mini Program from v1.2.25)	boolean	-	false	1.2.25
clearable	Show clear button	boolean	-	false	1.11.0
root-portal	Detach from page to resolve fixed positioning issues	boolean	-	false	1.11.0

FormItemRule Structure

Key	Description	Type
required	Whether the field is required	boolean
message	Error message text	string
validator	Custom validation function (can return a Promise for async validation)	(value, rule) => boolean | Promise
pattern	Validate using a regular expression (fails if no match)	RegExp

Events

Event Name	Description	Parameters	Minimum Version
confirm	Triggered on confirm button click	{ value, selectedItems }, where value is the selected value (array for multi-column), and selectedItems is the selected option(s)	-
cancel	Triggered on cancel button click	-	-
open	Triggered when picker popup opens	-	-
clear	Triggered on clear button click	-	1.11.0

Methods

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

Slots

Name	Description	Minimum Version
default	Default slot content	-
label	Left-side label slot	-

External Classes

Class Name	Description	Minimum Version
custom-class	Root node styles	-
custom-view-class	Custom styles for pickerView	-
custom-label-class	Custom styles for label	-
custom-value-class	Custom styles for value	-

Source Code

Documentation

• Component