feat: add empty array placeholder in forms (#3095)

web/projects/shared/src/i18n/dictionaries/de.ts

@@ -596,4 +596,5 @@ export default {
   626: 'Hochladen',
   627: 'UI öffnen',
   628: 'In Zwischenablage kopiert',
+  629: 'Die Liste ist leer',
 } satisfies i18n

web/projects/shared/src/i18n/dictionaries/en.ts

@@ -595,4 +595,5 @@ export const ENGLISH = {
   'Upload': 626, // as in, upload a file
   'Open UI': 627, // as in, upload a file
   'Copied to clipboard': 628,
+  'The list is empty': 629,
 } as Record<any, any>

web/projects/shared/src/i18n/dictionaries/es.ts

@@ -596,4 +596,5 @@ export default {
   626: 'Subir',
   627: 'Abrir UI',
   628: 'Copiado al portapapeles',
+  629: 'La lista está vacía',
 } satisfies i18n

web/projects/shared/src/i18n/dictionaries/fr.ts

@@ -596,4 +596,5 @@ export default {
   626: 'Téléverser',
   627: 'Ouvrir UI',
   628: 'Copié dans le presse-papiers',
+  629: 'La liste est vide',
 } satisfies i18n

web/projects/shared/src/i18n/dictionaries/pl.ts

@@ -596,4 +596,5 @@ export default {
   626: 'Prześlij',
   627: 'Otwórz UI',
   628: 'Skopiowano do schowka',
+  629: 'Lista jest pusta',
 } satisfies i18n

web/projects/ui/src/app/routes/portal/components/form.component.ts

@@ -80,7 +80,7 @@ export interface FormContext<T> {
       margin: 1rem -1px -1rem;
       gap: 1rem;
       background: var(--tui-background-elevation-1);
-      border-top: 1px solid var(--tui-background-base-alt);
+      box-shadow: inset 0 1px var(--tui-background-neutral-1);
     }
   `,
   imports: [

web/projects/ui/src/app/routes/portal/components/form/containers/array.component.ts

@@ -87,6 +87,8 @@ import { FormObjectComponent } from './object.component'
           }
         </div>
       </div>
+    } @empty {
+      <div class="placeholder">{{ 'The list is empty' | i18n }}</div>
     }
   `,
   styles: `
@@ -99,8 +101,8 @@ import { FormObjectComponent } from './object.component'
 
     .label {
       display: flex;
-      font-size: 1.25rem;
-      font-weight: bold;
+      align-items: center;
+      font: var(--tui-font-heading-6);
     }
 
     .add {
@@ -157,6 +159,17 @@ import { FormObjectComponent } from './object.component'
         animation-name: tuiFade, tuiCollapse;
       }
     }
+
+    .placeholder {
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      height: var(--tui-height-m);
+      color: var(--tui-text-tertiary);
+      border-radius: var(--tui-radius-m);
+      border: 1px dashed var(--tui-background-neutral-1);
+      margin: 0.5rem 0 0;
+    }
   `,
   hostDirectives: [ControlDirective],
   imports: [

web/projects/ui/src/app/routes/portal/components/form/controls/multiselect.component.ts

@@ -1,12 +1,11 @@
-import { Component } from '@angular/core'
+import { Component, computed } from '@angular/core'
 import { FormsModule } from '@angular/forms'
 import { invert } from '@start9labs/shared'
 import { IST } from '@start9labs/start-sdk'
-import { tuiPure } from '@taiga-ui/cdk'
 import { TuiIcon, TuiTextfield } from '@taiga-ui/core'
 import { TuiChevron, TuiMultiSelect, TuiTooltip } from '@taiga-ui/kit'
-import { Control } from './control'
 import { HintPipe } from '../pipes/hint.pipe'
+import { Control } from './control'
 
 @Component({
   selector: 'form-multiselect',
@@ -21,7 +20,8 @@ import { HintPipe } from '../pipes/hint.pipe'
         [disabled]="disabled"
         [readOnly]="readOnly"
         [items]="items"
-        [(ngModel)]="selected"
+        [ngModel]="selected()"
+        (ngModelChange)="onSelected($event)"
         (blur)="control.onTouched()"
       ></select>
       @if (spec | hint; as hint) {
@@ -58,30 +58,26 @@ export class FormMultiselectComponent extends Control<
 
   private readonly isExceedingLimit = (item: string) =>
     !!this.spec.maxLength &&
-    this.selected.length >= this.spec.maxLength &&
-    !this.selected.includes(item)
+    this.selected().length >= this.spec.maxLength &&
+    !this.selected().includes(item)
 
   readonly disabledItemHandler = (item: string): boolean =>
     this.isDisabled(item) || this.isExceedingLimit(item)
 
   readonly items = Object.values(this.spec.values)
+  readonly selected = computed(
+    () =>
+      this.control.value().map((key: string) => this.spec.values[key] || '') ||
+      [],
+  )
 
   get disabled(): boolean {
     return typeof this.spec.disabled === 'string'
   }
 
-  get selected(): string[] {
-    return this.memoize(this.value)
-  }
-
-  set selected(value: string[]) {
+  onSelected(value: string[]) {
     this.value = Object.entries(this.spec.values)
       .filter(([_, v]) => value.includes(v))
       .map(([k]) => k)
   }
-
-  @tuiPure
-  private memoize(value: null | readonly string[]): string[] {
-    return value?.map(key => this.spec.values[key] || '') || []
-  }
 }