Adding Multiple References to a Reference List

5 replies
Last updated: Jan 21, 2022
Hi everyone! I am using an array of references that may be used to select various itens. Thinking in terms of usability, I would like to know if there's a way to facilitate this multiple selection. At the moment, user needs to click 'add item', then type or click on the arrow down to see some options, select one, and then repeat this proccess for each subsequent selection; I was thinking about a solution involving checkboxes, inside the dropdown or even separatedly, but in a way that user can see the available options and just clicks on the ones he wants. So my question, is there currently a way that I can have something similar to this?I'm attaching an example to provide more clarity. Thanksss
Jan 17, 2022, 11:36 AM
Hi Racheal! Thanks for the responseYess, the UI for the array of strings looks exactly what I need! But in my case I really need to select references, sorry that with the image I posted I ended up misguiding my intentions haha
Isn't there a way to achieve a similar UI using array of references?
Jan 18, 2022, 12:16 AM
Not out of the box, but you could do it with a custom input component. I played around with it and got this to work:
{
      name: 'ReferenceMultiSelect',
      title: 'Country',
      type: 'array',
      of: [
        {
         type: 'reference',
         to: { type: 'country'}
        }
      ],
      inputComponent: ReferenceSelect
    }

//ReferenceSelect.js

import React, { useEffect, useState } from 'react'
import { Card, Flex, Checkbox, Box, Text } from '@sanity/ui'
import { FormField } from '@sanity/base/components'
import PatchEvent, {set, unset} from '@sanity/form-builder/PatchEvent'
import { useId } from "@reach/auto-id" 
import { studioClient } from '../../src/utils/studioClient'

const ReferenceSelect = React.forwardRef((props, ref) => {
  const [countries, setCountries] = useState([])

  useEffect(() => {
    const fetchCountries = async () => {
      await studioClient
        .fetch(`*[_type == 'country']{
          _id,
          title
        }`)
        .then(setCountries)
    }

    fetchCountries()
  }, []) 

  const { 
    type,         // Schema information
    value,        // Current field value
    readOnly,     // Boolean if field is not editable
    markers,      // Markers including validation rules
    presence,     // Presence information for collaborative avatars
    compareValue, // Value to check for "edited" functionality
    onFocus,      // Method to handle focus state
    onBlur,       // Method to handle blur state  
    onChange,      // Method to handle patch events,
  } = props

  const handleClick = React.useCallback(
    (e) => {
      const inputValue = {
        _key: e.target.value.slice(0, 10),
        _type: 'reference',
        _ref: e.target.value
      }
      
      if(value) {
        if(value.some(country => country._ref === inputValue._ref)) {
          onChange(PatchEvent.from(set(value.filter(item => item._ref != inputValue._ref))))
        } else {
          onChange(PatchEvent.from(set([...value, inputValue])))
        }
      } else {
        onChange(PatchEvent.from(set([inputValue])))
      }
    },
    [value]
  )

  const inputId = useId()

	return (
    <FormField
      description={type.description}  // Creates description from schema
      title={type.title}              // Creates label from schema title
      __unstable_markers={markers}    // Handles all markers including validation
      __unstable_presence={presence}  // Handles presence avatars
      compareValue={compareValue}     // Handles "edited" status
      inputId={inputId}               // Allows the label to connect to the input field
      readOnly={readOnly}
    >
      {
        countries.map(country => (
          <Card padding={2}>
            <Flex align="center">
              <Checkbox 
                id="checkbox" 
                style={{display: 'block'}} 
                onClick={handleClick}
                value={country._id}
                checked={value ? value.some(item => item._ref === country._id) : false}
              />
              <Box flex={1} paddingLeft={3}>
                <Text>
                  <label htmlFor="checkbox">{country.title}</label>
                </Text>
              </Box>
            </Flex>
          </Card>
        ))
      }
    </FormField>
	)
})

export default ReferenceSelect
But if you want to go with out of the box option, you can just use the following and select from a list:

{
      name: 'countries',
      title: 'Country',
      type: 'array',
      of: [
        {
         type: 'reference',
         to: { type: 'country'}
        }
      ],
    }
Jan 18, 2022, 4:07 AM
Not out of the box, but you could do it with a custom input component. I played around with it and got this to work:
{
      name: 'ReferenceMultiSelect',
      title: 'Country',
      type: 'array',
      of: [
        {
         type: 'reference',
         to: { type: 'country'}
        }
      ],
      inputComponent: ReferenceSelect
    }

//ReferenceSelect.js

import React, { useEffect, useState } from 'react'
import { Card, Flex, Checkbox, Box, Text } from '@sanity/ui'
import { FormField } from '@sanity/base/components'
import PatchEvent, {set, unset} from '@sanity/form-builder/PatchEvent'
import { useId } from "@reach/auto-id" 
import { studioClient } from '../../src/utils/studioClient'

const ReferenceSelect = React.forwardRef((props, ref) => {
  const [countries, setCountries] = useState([])

  useEffect(() => {
    const fetchCountries = async () => {
      await studioClient
        .fetch(`*[_type == 'country']{
          _id,
          title
        }`)
        .then(setCountries)
    }

    fetchCountries()
  }, []) 

  const { 
    type,         // Schema information
    value,        // Current field value
    readOnly,     // Boolean if field is not editable
    markers,      // Markers including validation rules
    presence,     // Presence information for collaborative avatars
    compareValue, // Value to check for "edited" functionality
    onFocus,      // Method to handle focus state
    onBlur,       // Method to handle blur state  
    onChange,      // Method to handle patch events,
  } = props

  const handleClick = React.useCallback(
    (e) => {
      const inputValue = {
        _key: e.target.value.slice(0, 10),
        _type: 'reference',
        _ref: e.target.value
      }
      
      if(value) {
        if(value.some(country => country._ref === inputValue._ref)) {
          onChange(PatchEvent.from(set(value.filter(item => item._ref != inputValue._ref))))
        } else {
          onChange(PatchEvent.from(set([...value, inputValue])))
        }
      } else {
        onChange(PatchEvent.from(set([inputValue])))
      }
    },
    [value]
  )

  const inputId = useId()

	return (
    <FormField
      description={type.description}  // Creates description from schema
      title={type.title}              // Creates label from schema title
      __unstable_markers={markers}    // Handles all markers including validation
      __unstable_presence={presence}  // Handles presence avatars
      compareValue={compareValue}     // Handles "edited" status
      inputId={inputId}               // Allows the label to connect to the input field
      readOnly={readOnly}
    >
      {
        countries.map(country => (
          <Card padding={2}>
            <Flex align="center">
              <Checkbox 
                id="checkbox" 
                style={{display: 'block'}} 
                onClick={handleClick}
                value={country._id}
                checked={value ? value.some(item => item._ref === country._id) : false}
              />
              <Box flex={1} paddingLeft={3}>
                <Text>
                  <label htmlFor="checkbox">{country.title}</label>
                </Text>
              </Box>
            </Flex>
          </Card>
        ))
      }
    </FormField>
	)
})

export default ReferenceSelect
Jan 18, 2022, 4:07 AM
Amaaazing! It worked perfectly! That seemed like a lot of work, much much thanks! My UI looks way better now thanks to you haha Have all the best!
Jan 20, 2022, 2:41 AM
Glad it worked for you!
Jan 21, 2022, 3:54 PM

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