Adding focus to the input after the reset button is clicked

(cherry picked from commit e54b1ce)

Author: Andrea-Guevara

src/app/shared/form/vocabulary-treeview/vocabulary-treeview.component.html

@@ -2,7 +2,7 @@
 <div class="treeview-header row mb-1">
   <div class="col-12">
     <div class="input-group">
-      <input type="text" class="form-control" [(ngModel)]="searchText" (keyup.enter)="search()"
+      <input #searchInput type="text" class="form-control" [(ngModel)]="searchText" (keyup.enter)="search()"
              [attr.aria-label]="'vocabulary-treeview.search.form.search-placeholder' | translate"
              [placeholder]="'vocabulary-treeview.search.form.search-placeholder' | translate">
       <div class="input-group-append" id="button-addon4">

src/app/shared/form/vocabulary-treeview/vocabulary-treeview.component.ts

@@ -8,13 +8,15 @@ import {
 } from '@angular/common';
 import {
   Component,
+  ElementRef,
   EventEmitter,
   Input,
   OnChanges,
   OnDestroy,
   OnInit,
   Output,
   SimpleChanges,
+  ViewChild,
 } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { NgbTooltipModule } from '@ng-bootstrap/ng-bootstrap';
@@ -70,6 +72,11 @@ export type VocabularyTreeItemType = FormFieldMetadataValueObject | VocabularyEn
 })
 export class VocabularyTreeviewComponent implements OnDestroy, OnInit, OnChanges {
 
+  /**
+   * Implemented to manage focus on input
+   */
+  @ViewChild('searchInput') searchInput: ElementRef;
+
   /**
    * The {@link VocabularyOptions} object
    */
@@ -332,6 +339,7 @@ export class VocabularyTreeviewComponent implements OnDestroy, OnInit, OnChanges
       this.storedNodeMap = new Map<string, TreeviewFlatNode>();
       this.vocabularyTreeviewService.restoreNodes();
     }
+    this.searchInput.nativeElement.focus();
   }
 
   add() {