Initialize Lookup selected values in JS constructor

demos/_unit-test/dropdown-html.php

@@ -0,0 +1,112 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Atk4\Ui\Demos;
+
+use Atk4\Data\Model;
+use Atk4\Data\Persistence;
+use Atk4\Ui\App;
+use Atk4\Ui\Form;
+use Atk4\Ui\Message;
+
+/** @var App $app */
+require_once __DIR__ . '/../init-app.php';
+
+$makeTestStringFx = static fn ($v) => $v . ' <b>"\' &lt;';
+$htmlValues = [
+    $makeTestStringFx('d') => $makeTestStringFx('dTitle'),
+    $makeTestStringFx('u') => $makeTestStringFx('uTitle'),
+];
+
+$form = Form::addTo($app);
+
+$form->addControl('dropdown_single', [
+    Form\Control\Dropdown::class,
+    'caption' => 'Dropdown single',
+    'values' => $htmlValues,
+]);
+
+$form->addControl('dropdown_single2', [
+    Form\Control\Dropdown::class,
+    'caption' => 'Dropdown single allow addition',
+    'values' => $htmlValues,
+    'dropdownOptions' => ['allowAdditions' => true],
+]);
+
+$form->addControl('dropdown_multi', [
+    Form\Control\Dropdown::class,
+    'caption' => 'Dropdown multiple',
+    'multiple' => true,
+    'values' => $htmlValues,
+]);
+
+$form->addControl('dropdown_multi2', [
+    Form\Control\Dropdown::class,
+    'caption' => 'Dropdown multiple allow addition',
+    'multiple' => true,
+    'values' => $htmlValues,
+    'dropdownOptions' => ['allowAdditions' => true],
+]);
+
+$lookupModel = new Model();
+$lookupModel->addField('id', ['type' => 'string']);
+$lookupModel->addField('name', ['type' => 'string']);
+$lookupModel->setPersistence(new Persistence\Array_(array_combine(
+    array_keys($htmlValues),
+    array_map(static fn ($v) => ['name' => $v], $htmlValues)
+)));
+
+/* $form->addControl('lookup_single', [
+    Form\Control\Lookup::class,
+    'caption' => 'Lookup single',
+    'model' => $lookupModel,
+]);
+
+$form->addControl('lookup_single2', [
+    Form\Control\Lookup::class,
+    'caption' => 'Lookup single allow addition',
+    'model' => $lookupModel,
+    'settings' => ['allowAdditions' => true],
+]);
+
+$form->addControl('lookup_multi', [
+    Form\Control\Lookup::class,
+    'caption' => 'Lookup multiple',
+    'multiple' => true,
+    'model' => $lookupModel,
+]);
+
+$form->addControl('lookup_multi2', [
+    Form\Control\Lookup::class,
+    'caption' => 'Lookup multiple allow addition',
+    'multiple' => true,
+    'model' => $lookupModel,
+    'settings' => ['allowAdditions' => true],
+]); */
+
+foreach (array_keys($form->entity->getFields()) as $k) {
+    $form->entity->set($k, $makeTestStringFx('d'));
+}
+
+$initData = $form->entity->get();
+
+$form->onSubmit(static function (Form $form) use ($app, $initData, $makeTestStringFx) {
+    $message = $app->encodeJson($form->entity->get());
+
+    // TODO remove once https://github.com/fomantic/Fomantic-UI/pull/3205 is merged
+    foreach ($form->entity->get() as $k => $v) {
+        $form->entity->set($k, str_replace('&quot;', '"', $v));
+    }
+
+    $view = new Message('Values:');
+    $view->setApp($form->getApp());
+    $view->invokeInit();
+    $view->text->addParagraph($message);
+    $view->text->addParagraph('match init: ' . ($form->entity->get() === $initData));
+    $view->text->addParagraph('match u add: ' . ($form->entity->get() === array_map(static fn ($k) => (str_contains($k, 'multi') ? $initData[$k] . ',' : '') . $makeTestStringFx('u'), array_combine(array_keys($initData), array_keys($initData)))));
+    $view->text->addParagraph('match empty: ' . ($form->entity->get() === array_map(static fn () => '', $initData)));
+    $view->text->addParagraph('match u only: ' . ($form->entity->get() === array_map(static fn () => $makeTestStringFx('u'), $initData)));
+
+    return $view;
+});