New Feature add the Select input on multiple input widget

@@ -104,6 +104,24 @@
               </mat-error>
             </mat-form-field>
           </div>
+          <div class="input-field" *ngIf="key.settings.dataKeyValueType === 'select'">
+            <mat-form-field class="mat-block">
+              <mat-label>{{key.label}}</mat-label>
+              <mat-select formControlName="{{key.formId}}"
+                          [required]="key.settings.required"
+                          (focus)="key.isFocused = true;"
+                          (blur)="key.isFocused = false; inputChanged(source, key)">
+                <mat-option *ngFor="let option of key.settings.selectOptions"
+                            [value]="option.value !== 'null' ? option.value : null"
+                            [disabled]="key.settings.isEditable === 'readonly'">
+                  {{ getCustomTranslationText(option.label ? option.label : option.value) }}
+                </mat-option>
+              </mat-select>
+              <mat-error *ngIf="multipleInputFormGroup.get(key.formId).hasError('required')">
+                {{ getErrorMessageText(key.settings, 'required') }}
+              </mat-error>
+            </mat-form-field>
+          </div>
         </div>
       </div>
     </fieldset>

@@ -41,7 +41,7 @@ type FieldAlignment = 'row' | 'column';
 type MultipleInputWidgetDataKeyType = 'server' | 'shared' | 'timeseries';
 type MultipleInputWidgetDataKeyValueType = 'string' | 'double' | 'integer' |
                                            'booleanCheckbox' | 'booleanSwitch' |
-                                           'dateTime' | 'date' | 'time';
+                                           'dateTime' | 'date' | 'time' | 'select';
 type MultipleInputWidgetDataKeyEditableType = 'editable' | 'disabled' | 'readonly';
 
 interface MultipleInputWidgetSettings {
@@ -58,9 +58,15 @@ interface MultipleInputWidgetSettings {
   attributesShared?: boolean;
 }
 
+interface MultipleInputWidgetSelectOption {
+  value: string;
+  label: string;
+}
+
 interface MultipleInputWidgetDataKeySettings {
   dataKeyType: MultipleInputWidgetDataKeyType;
   dataKeyValueType: MultipleInputWidgetDataKeyValueType;
+  selectOptions: MultipleInputWidgetSelectOption[];
   required: boolean;
   isEditable: MultipleInputWidgetDataKeyEditableType;
   disabledOnDataKey: string;
@@ -445,6 +451,10 @@ export class MultipleInputWidgetComponent extends PageComponent implements OnIni
     return messageText;
   }
 
+  public getCustomTranslationText(value): string {
+    return this.utils.customTranslation(value, value);
+  }
+
   public visibleKeys(source: MultipleInputWidgetSource): MultipleInputWidgetDataKey[] {
     return source.keys.filter(key => !key.settings.dataKeyHidden);
   }