Nova Multiselect

This Laravel Nova package adds a multiselect to Nova's arsenal of fields.

Requirements

• php: >=7.2
• laravel/nova: ^3.0

Features

• Multi- and singleselect with search
• Asynchronous search
• Reordering functionality with drag & drop
• Dependency on other Multiselect instances
• Distinct values between multiple multiselects

Screenshots

Installation

Install the package in a Laravel Nova project via Composer:

composer require optimistdigital/nova-multiselect-field

Usage

The field is used similarly to Nova's native Select field. The field type in the database should be text-based (ie string, text or varchar), selected values are stored as a stringified JSON array.

use OptimistDigital\MultiselectField\Multiselect;

public function fields(Request $request)
{
    return [
      Multiselect::make('Football teams')
        ->options([
          'liverpool' => 'Liverpool FC',
          'tottenham' => 'Tottenham Hotspur',
        ])

        // Optional:
        ->placeholder('Choose football teams') // Placeholder text
        ->max(4) // Maximum number of items the user can choose
        ->saveAsJSON() // Saves value as JSON if the database column is of JSON type
        ->optionsLimit(5) // How many items to display at once
        ->reorderable() // Allows reordering functionality
        ->singleSelect() // If you want a searchable single select field
        ->distinct('football') // Disables values used by other multiselects in same distinct group

        // Async model querying
        Multiselect::make('Artists')
          ->asyncResource(Artist::class),

          // If you want a custom search, create your own endpoint:
          ->api('/api/multiselect/artists?something=false', Artist::class),
    ];
}

Option groups

Option groups are supported. Their syntax is the same as Laravel's option group syntax.

In this example (from Nova docs), all values are grouped by the group key:

->options([
    'MS' => ['label' => 'Small', 'group' => 'Men Sizes'],
    'MM' => ['label' => 'Medium', 'group' => 'Men Sizes'],
    'WS' => ['label' => 'Small', 'group' => 'Women Sizes'],
    'WM' => ['label' => 'Medium', 'group' => 'Women Sizes'],
])

Dependencies

You can make a Multiselect depend on another by using dependsOn. This also requires specifying ->dependsOnOptions(). The value from the dependsOn Multiselect has to be the key to the options and the value must be a key-value dictionary of options as usual.

Usage:

Multiselect::make('Country', 'country')
    ->options([
        'IT' => 'Italy',
        'SG' => 'Singapore',
    ]),

Multiselect::make('Language', 'language')
    ->dependsOn('country')
    ->dependsOnOptions([
        'IT' => [
            'it' => 'Italian',
        ],
        'SG' => [
            'en' => 'English',
            'ms' => 'Malay',
            'zh' => 'Chinese',
        ]
    ]),

    // Optionally define max number of values
    ->dependsOnMax([
        'IT' => 1,
        'SG' => 3,
    ])

Belongs-To-Many

You can use this field for BelongsToMany relationship selection.

// Add your BelongsToMany relationship to your model:
public function categories()
{
    return $this->belongsToMany(\App\Models\Category::class);
}

// Add the field to your Resource:
Multiselect::make('Categories', 'categories')
  ->belongsToMany(\App\Nova\Resources\Category::class),

Options

Possible options you can pass to the field using the option name as a function, ie ->placeholder('Choose peanuts').

Option	type	default	description
options	Array|callable	[]	Options in an array as key-value pairs (['id' => 'value']).
api($path, $resource)	String, String (Resource)	null	URL that can be used to fetch options asynchronously. The search string is provided in the search query parameter. The API must return object containing key-value pairs (['id' => 'value']).
asyncResource($resource)	String (Resource)	null	Provide a Resource class to fetch the options asynchronously.
placeholder	String	Field name	The placeholder string for the input.
max	Number	Infinite	The maximum number of options a user can select.
groupSelect	Boolean	false	For use with option groups - allows the user to select whole groups at once
singleSelect	Boolean	false	Makes the field act as a single select which also means the saved value will not be an array.
saveAsJSON	Boolean	false	When you have a SQL JSON column, you can force the field to save the values as JSON. By default, values are saved as a stringified array.
optionsLimit	Number	1000	The maximum number of options displayed at once. Other options are still accessible through searching.
nullable	Boolean	false	If the field is nullable an empty select will result in null else an empty array ([]) is stored.
reorderable	Boolean	false	Enables (or disables) the reordering functionality of the multiselect field.
dependsOn	String	null	Determines which Multiselect this field depends on.
dependsOnOptions	Array	null	Determines the options for dependsOn. See example above on how to format it correctly.
belongsToMany	String (Resource)	null	Allows the Multiselect to function as a BelongsToMany field.
belongsTo	String (Resource)	null	Allows the Multiselect to function as a BelongsTo field.
resolveForPageResponseUsing	Callable	null	Only for use in conjunction with Page Manager. Allows you to format the value before it is returned through the API.
clearOnSelect	Boolean	false	Clears input after an option has been selected.
distinct	String	Field Attribute	Syncs options between multiple multiselects in the same group and disables the options that have already been used.
indexDelimiter	String	', '	Sets delimiter used to join values on index view
indexValueDisplayLimit	Number	9999	Define how many values can be displayed at once on index view
indexCharDisplayLimit	Number	40	Set char limit for index display value

Localization

The translations file can be published by using the following publish command:

php artisan vendor:publish --provider="OptimistDigital\MultiselectField\FieldServiceProvider" --tag="translations"

You can then edit the strings to your liking.

Overwriting the detail field

You can overwrite the detail view value component to customize it as you see fit.

Create a new component for NovaMultiselectDetailFieldValue and register it in your app.js. The component receives two props: field and values. The values prop is an array of selected labels.

// in NovaMultiselectDetailFieldValue.vue

<template>
  <div class="relative rounded-lg bg-white shadow border border-60" v-if="values">
    <div class="overflow-hidden rounded-b-lg rounded-t-lg">
      <div class="border-b border-50 cursor-text font-mono text-sm py-2 px-4" v-for="(value, i) of values" :key="i">
        {{ value }}
      </div>
    </div>
  </div>

  <div v-else>—</div>
</template>

<script>
export default {
  props: ['field', 'values'],
};
</script>

// in app.js

import NovaMultiselectDetailFieldValue from './NovaMultiselectDetailFieldValue';

Nova.booting((Vue, router, store) => {
  Vue.component('nova-multiselect-detail-field-value', NovaMultiselectDetailFieldValue);
});

Credits

• Tarvo Reinpalu
• shentao/vue-multiselect

License

This project is open-sourced software licensed under the MIT license.