I am showing multiselect dropdown in user form in admin panel(System->All user->Add User) I have created a plugin for creating field in that form. Here is the code, I am using:

public function aroundGetFormHtml(
    \Magento\User\Block\User\Edit\Tab\Main $subject,
    \Closure $proceed
) {
    $_objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $registry = $_objectManager->get('Magento\Framework\Registry');
    $model = $registry->registry('permissions_user');
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $form = $subject->getForm();
    if (is_object($form)) {
            $fieldset = $form->addFieldset('user_attribute_fieldset', ['legend' => __('User Category')]);
            // Gather our existing categories
            $currentCategories = $this->_getExistingCategories($model);
                    'name' => 'user_fields',
                    'label' => __('user fields'),
                    'id' => 'user_fields',
                    'title' => __('user fields'),
                    'value' => $currentCategories,//for selected value
                    'values' => $objectManager->create('{namespace}\{module}\Helper\Data')->getOptions()//for all options

    return $proceed();

Now I want to create this as a Multi Select UI Field, shown below: enter image description here

how I can implement ui select component in existing magento forms not made with ui components?

Thanks in advance:)

  • I ain't sure but you can't add ui_component in form developed using PHP, You need to create whole form with ui_component than you can add Multiselect as you mentioned in question. – anonymous May 30 '18 at 11:14
  • But its magento's default form, how can I recreate the whole form through UI component? – user00247 May 30 '18 at 11:35
  • Hello. Did you solved this issue? I face same issue. Can you please post answer if you sovled already? – Dharmik Ponda Apr 29 at 12:36
  • @Denish please check my answer, hope it helps. – user00247 Apr 30 at 6:22

Firstly add a field in your ui-form:

<field name="custom" component="Namespce_Modulename/js/select-category" sortOrder="20" formElement="select">
<argument name="data" xsi:type="array">
 <item name="config" xsi:type="array">
    <item name="filterOptions" xsi:type="boolean">true</item>
     //to add filter in select-ui
    <item name="multiple" xsi:type="boolean">false</item>//select multiple or not
    <item name="showCheckbox" xsi:type="boolean">true</item>//to show checkboxes
    <item name="disableLabel" xsi:type="boolean">true</item>
    <rule name="required-entry" xsi:type="boolean">true</rule>
<label translate="true">Select Category</label>//label to Field
<dataScope>data.custom</dataScope>//To map
    <link name="${ $.namespace }.${ $.namespace }:responseData">setParsed</link>
        <options class="Namespace\ModuleName\Ui\Component\Form\Category\Options"/>

Now create Js file to map the field's value:


], function (Select) {
'use strict';
return Select.extend({
 * Parse data and set it to options.
 * @param {Object} data - Response data object.
 * @returns {Object}
setParsed: function (data) {
    var option = this.parseData(data);
    if (data.error) {
        return this;
    this.set('newOption', option);
 * Normalize option object.
 * @param {Object} data - Option object.
 * @returns {Object}
parseData: function (data) {
    return {
        value: data.category.entity_id,
        label: data.category.name

Create a file to get options to display:


namespace Namespace\ModuleName\Ui\Component\Form\Category;

use Magento\Framework\Data\OptionSourceInterface;
use Magento\Catalog\Model\ResourceModel\Category\CollectionFactory as         CategoryCollectionFactory;
use Magento\Framework\App\RequestInterface;

 * Options tree for "Categories" field
class Options implements OptionSourceInterface

protected $categoryCollectionFactory;

  * @var RequestInterface
 protected $request;

 * @var array
 protected $categoryTree;

  * @param CategoryCollectionFactory $categoryCollectionFactory
  * @param RequestInterface $request
public function __construct(
CategoryCollectionFactory $categoryCollectionFactory,
RequestInterface $request
) {
$this->categoryCollectionFactory = $categoryCollectionFactory;
$this->request = $request;

* {@inheritdoc}
public function toOptionArray()
return $this->getCategoryTree();

* Retrieve categories tree
* @return array
protected function getCategoryTree()
if ($this->categoryTree === null) {
    $collection = $this->categoryCollectionFactory->create();


    foreach ($collection as $category) {
        $categoryId = $category->getEntityId();
        if (!isset($categoryById[$categoryId])) {
            $categoryById[$categoryId] = [
                'value' => $categoryId
        $categoryById[$categoryId]['label'] = $category->getName();
    $this->categoryTree = $categoryById;
   return $this->categoryTree;

Hope it helps!!!

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