diff --git a/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.spec.ts b/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.spec.ts
index ae527ea62d..5a480e7773 100644
--- a/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.spec.ts
+++ b/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.spec.ts
@@ -18,6 +18,7 @@
 import { FormFieldOption } from './form-field-option';
 import { FormFieldTypes } from './form-field-types';
 import {
+    FixedValueFieldValidator,
     MaxLengthFieldValidator,
     MaxValueFieldValidator,
     MinLengthFieldValidator,
@@ -533,4 +534,57 @@ describe('FormFieldValidator', () => {
         });
 
     });
+
+    describe('FixedValueFieldValidator', () => {
+
+        let validator: FixedValueFieldValidator;
+
+        beforeEach(() => {
+            validator = new FixedValueFieldValidator();
+        });
+
+        it('should support only typeahead field', () => {
+            let field = new FormFieldModel(new FormModel(), {
+                type: FormFieldTypes.TEXT
+            });
+            expect(validator.isSupported(field)).toBeFalsy();
+
+            field = new FormFieldModel(new FormModel(), {
+                type: FormFieldTypes.TYPEAHEAD
+            });
+
+            expect(validator.isSupported(field)).toBeTruthy();
+        });
+
+        it('should allow empty values', () => {
+            let field = new FormFieldModel(new FormModel(), {
+                type: FormFieldTypes.TYPEAHEAD,
+                value: null,
+                regexPattern: 'pattern'
+            });
+
+            expect(validator.validate(field)).toBeTruthy();
+        });
+
+        it('should succeed for a valid input value in options', () => {
+            let field = new FormFieldModel(new FormModel(), {
+                type: FormFieldTypes.TYPEAHEAD,
+                value: '1',
+                options: [{id: '1', name: 'Leanne Graham'}, {id: '2', name: 'Ervin Howell'}]
+            });
+
+            expect(validator.validate(field)).toBeTruthy();
+        });
+
+        it('should fail for an invalid input value in options', () => {
+            let field = new FormFieldModel(new FormModel(), {
+                type: FormFieldTypes.TYPEAHEAD,
+                value: 'Lean',
+                options: [{id: '1', name: 'Leanne Graham'}, {id: '2', name: 'Ervin Howell'}]
+            });
+
+            expect(validator.validate(field)).toBeFalsy();
+        });
+
+    });
 });
diff --git a/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.ts b/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.ts
index f1a7756303..51639b3ca6 100644
--- a/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.ts
+++ b/ng2-components/ng2-activiti-form/src/components/widgets/core/form-field-validator.ts
@@ -366,6 +366,47 @@ export class RegExFieldValidator implements FormFieldValidator {
 
 }
 
+export class FixedValueFieldValidator implements FormFieldValidator {
+
+    private supportedTypes = [
+        FormFieldTypes.TYPEAHEAD
+    ];
+
+    isSupported(field: FormFieldModel): boolean {
+        return field && this.supportedTypes.indexOf(field.type) > -1;
+    }
+
+    hasValidNameOrValidId(field: FormFieldModel): boolean {
+        return this.hasValidName(field) || this.hasValidId(field);
+    }
+
+    hasValidName(field: FormFieldModel) {
+        return field.options.find(item => item.name && item.name.toLocaleLowerCase() === field.value.toLocaleLowerCase()) ? true : false;
+    }
+
+    hasValidId(field: FormFieldModel) {
+        return field.options[field.value - 1] ? true : false;
+    }
+
+    hasStringValue(field: FormFieldModel) {
+        return field.value && typeof field.value === 'string';
+    }
+
+    hasOptions(field: FormFieldModel) {
+        return field.options && field.options.length > 0;
+    }
+
+    validate(field: FormFieldModel): boolean {
+        if (this.isSupported(field)) {
+            if (this.hasStringValue(field) && this.hasOptions(field) && !this.hasValidNameOrValidId(field)) {
+                field.validationSummary = 'Invalid data inserted';
+                return false;
+            }
+        }
+        return true;
+    }
+}
+
 export const FORM_FIELD_VALIDATORS = [
     new RequiredFieldValidator(),
     new NumberFieldValidator(),
@@ -376,5 +417,6 @@ export const FORM_FIELD_VALIDATORS = [
     new RegExFieldValidator(),
     new DateFieldValidator(),
     new MinDateFieldValidator(),
-    new MaxDateFieldValidator()
+    new MaxDateFieldValidator(),
+    new FixedValueFieldValidator()
 ];
diff --git a/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.html b/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.html
index c5eea0646e..1289f51401 100644
--- a/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.html
+++ b/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.html
@@ -10,18 +10,16 @@
                    type="text"
                    [id]="field.id"
                    [(ngModel)]="value"
+                   (ngModelChange)="validate()"
                    (keyup)="onKeyUp($event)"
                    [disabled]="field.readOnly"
                    placeholder="{{field.placeholder}}"
                    [mdAutocomplete]="auto">
             <md-autocomplete #auto="mdAutocomplete" (optionSelected)="onItemSelect($event.option.value)">
-                <md-option *ngFor="let item of options" (click)="onItemClick(item, $event)"  [value]="item">
-                    <span>{{item.name}}</span>
+                <md-option *ngFor="let item of options" [value]="item">
+                    <span [id]="field.name+'_option_'+item.id">{{item.name}}</span>
                 </md-option>
             </md-autocomplete>
-            <md-select class="adf-select" [id]="field.id" [(ngModel)]="field.value">
-                <md-option id="readonlyOption" *ngIf="isReadOnlyType()" [value]="field.value">{{field.value}}</md-option>
-            </md-select>
         </md-input-container>
 
         <error-widget [error]="field.validationSummary"></error-widget>
diff --git a/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.spec.ts b/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.spec.ts
index f159a7a3cb..681902efdb 100644
--- a/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.spec.ts
+++ b/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.spec.ts
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 
+import { OverlayContainer } from '@angular/cdk/overlay';
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
 import { CoreModule, LogServiceMock } from 'ng2-alfresco-core';
 import { Observable } from 'rxjs/Rx';
@@ -37,6 +38,7 @@ describe('TypeaheadWidgetComponent', () => {
     let widget: TypeaheadWidgetComponent;
     let visibilityService: WidgetVisibilityService;
     let logService: LogServiceMock;
+    let overlayContainerElement: HTMLElement;
 
     beforeEach(() => {
         logService = new LogServiceMock();
@@ -108,23 +110,6 @@ describe('TypeaheadWidgetComponent', () => {
         expect(widget.handleError).toHaveBeenCalledWith(err);
     });
 
-    it('should prevent default behaviour on option item click', () => {
-        let event = jasmine.createSpyObj('event', ['preventDefault']);
-        widget.onItemClick(null, event);
-        expect(event.preventDefault).toHaveBeenCalled();
-    });
-
-    it('should update values on option item click', () => {
-        let option: FormFieldOption = <FormFieldOption> {
-            id: '1',
-            name: 'name'
-        };
-        spyOn(visibilityService, 'refreshVisibility').and.stub();
-        widget.onItemClick(option, null);
-        expect(widget.field.value).toBe(option.id);
-        expect(widget.value).toBe(option.name);
-    });
-
     it('should setup initial value', () => {
         spyOn(formService, 'getRestFieldValues').and.returnValue(Observable.create(observer => {
             observer.next([
@@ -208,89 +193,6 @@ describe('TypeaheadWidgetComponent', () => {
         expect(filtered[0]).toEqual(options[1]);
     });
 
-    it('should update form on value flush', () => {
-        spyOn(widget.field, 'updateForm').and.callThrough();
-        widget.flushValue();
-        expect(widget.field.updateForm).toHaveBeenCalled();
-    });
-
-    it('should flush selected value', () => {
-        let options: FormFieldOption[] = [
-            { id: '1', name: 'Item one' },
-            { id: '2', name: 'Item Two' }
-        ];
-
-        widget.field.options = options;
-        widget.value = 'Item Two';
-        widget.flushValue();
-
-        expect(widget.value).toBe(options[1].name);
-        expect(widget.field.value).toBe(options[1].id);
-    });
-
-    it('should be case insensitive when flushing value', () => {
-        let options: FormFieldOption[] = [
-            { id: '1', name: 'Item one' },
-            { id: '2', name: 'iTEM TWo' }
-        ];
-
-        widget.field.options = options;
-        widget.value = 'ITEM TWO';
-        widget.flushValue();
-
-        expect(widget.value).toBe(options[1].name);
-        expect(widget.field.value).toBe(options[1].id);
-    });
-
-    it('should reset fields when flushing missing option value', () => {
-        widget.field.options = [
-            { id: '1', name: 'Item one' },
-            { id: '2', name: 'Item two' }
-        ];
-        widget.value = 'Missing item';
-        widget.flushValue();
-
-        expect(widget.value).toBeNull();
-        expect(widget.field.value).toBeNull();
-    });
-
-    it('should reset fields when flushing incorrect value', () => {
-        widget.field.options = [
-            { id: '1', name: 'Item one' },
-            { id: '2', name: 'Item two' }
-        ];
-        widget.field.value = 'Item two';
-        widget.value = 'Item two!';
-        widget.flushValue();
-
-        expect(widget.value).toBeNull();
-        expect(widget.field.value).toBeNull();
-    });
-
-    it('should reset fields when flushing value having no options', () => {
-        widget.field.options = null;
-        widget.field.value = 'item 1';
-        widget.value = 'new item';
-        widget.flushValue();
-
-        expect(widget.value).toBeNull();
-        expect(widget.field.value).toBeNull();
-    });
-
-    it('should emit field change event on item click', () => {
-        let event = jasmine.createSpyObj('event', ['preventDefault']);
-        let fakeField = new FormFieldModel(new FormModel(), { id: 'fakeField', value: 'fakeValue' });
-        widget.field = fakeField;
-        let item = { id: 'fake-id-opt', name: 'fake-name-opt' };
-        widget.onItemClick(item, event);
-
-        widget.fieldChanged.subscribe((field) => {
-            expect(field).toBeDefined();
-            expect(field.id).toEqual('fakeField');
-            expect(field.value).toEqual('fake-id-opt');
-        });
-    });
-
     describe('when template is ready', () => {
         let typeaheadWidgetComponent: TypeaheadWidgetComponent;
         let fixture: ComponentFixture<TypeaheadWidgetComponent>;
@@ -308,7 +210,19 @@ describe('TypeaheadWidgetComponent', () => {
             TestBed.configureTestingModule({
                 imports: [CoreModule, MaterialModule],
                 declarations: [TypeaheadWidgetComponent, ErrorWidgetComponent],
-                providers: [FormService, EcmModelService, WidgetVisibilityService]
+                providers: [
+                    {provide: OverlayContainer, useFactory: () => {
+                        overlayContainerElement = document.createElement('div');
+                        overlayContainerElement.classList.add('cdk-overlay-container');
+
+                        document.body.appendChild(overlayContainerElement);
+
+                        // remove body padding to keep consistent cross-browser
+                        document.body.style.padding = '0';
+                        document.body.style.margin = '0';
+
+                        return {getContainerElement: () => overlayContainerElement};
+                      }}, FormService, EcmModelService, WidgetVisibilityService]
             }).compileComponents().then(() => {
                 fixture = TestBed.createComponent(TypeaheadWidgetComponent);
                 typeaheadWidgetComponent = fixture.componentInstance;
@@ -321,6 +235,33 @@ describe('TypeaheadWidgetComponent', () => {
             TestBed.resetTestingModule();
         });
 
+        describe ('and typeahead is in readonly mode', () => {
+
+            it('should show typeahead value with input disabled', async(() => {
+                typeaheadWidgetComponent.field = new FormFieldModel(
+                    new FormModel({ processVariables: [{ name: 'typeahead-id_LABEL', value: 'FakeProcessValue' }] }), {
+                    id: 'typeahead-id',
+                    name: 'typeahead-name',
+                    type: 'readonly',
+                    params: { field: { id: 'typeahead-id', name: 'typeahead-name', type: 'typeahead' } }
+                });
+                fixture.detectChanges();
+                fixture.whenStable().then(() => {
+                    fixture.detectChanges();
+                    let readonlyInput: HTMLInputElement = <HTMLInputElement> element.querySelector('#typeahead-id');
+                    expect(readonlyInput.disabled).toBeTruthy();
+                    expect(readonlyInput).not.toBeNull();
+                    expect(readonlyInput.value).toBe('FakeProcessValue');
+                });
+            }));
+
+            afterEach(() => {
+                fixture.destroy();
+                TestBed.resetTestingModule();
+            });
+
+        });
+
         describe('and typeahead is populated via taskId', () => {
 
             beforeEach(async(() => {
@@ -344,14 +285,58 @@ describe('TypeaheadWidgetComponent', () => {
             }));
 
             it('should show typeahead options', async(() => {
-                let keyboardEvent = new KeyboardEvent('keypress');
+                let typeahedElement = fixture.debugElement.query(By.css('#typeahead-id'));
+                let typeahedHTMLElement: HTMLInputElement = <HTMLInputElement> typeahedElement.nativeElement;
+                typeahedHTMLElement.focus();
                 typeaheadWidgetComponent.value = 'F';
+                typeahedHTMLElement.value = 'F';
+                typeahedHTMLElement.dispatchEvent(new Event('keyup'));
+                typeahedHTMLElement.dispatchEvent(new Event('input'));
+                fixture.detectChanges();
+                fixture.whenStable().then(() => {
+                    fixture.detectChanges();
+                    expect(fixture.debugElement.query(By.css('[id="typeahead-name_option_1"]'))).not.toBeNull();
+                    expect(fixture.debugElement.query(By.css('[id="typeahead-name_option_2"]'))).not.toBeNull();
+                    expect(fixture.debugElement.query(By.css('[id="typeahead-name_option_3"]'))).not.toBeNull();
+                });
+            }));
+
+            it('should hide the option when the value is empty', async(() => {
+                let typeahedElement = fixture.debugElement.query(By.css('#typeahead-id'));
+                let typeahedHTMLElement: HTMLInputElement = <HTMLInputElement> typeahedElement.nativeElement;
+                typeahedHTMLElement.focus();
+                typeaheadWidgetComponent.value = 'F';
+                typeahedHTMLElement.value = 'F';
+                typeahedHTMLElement.dispatchEvent(new Event('keyup'));
+                typeahedHTMLElement.dispatchEvent(new Event('input'));
+                fixture.detectChanges();
+                fixture.whenStable().then(() => {
+                    fixture.detectChanges();
+                    expect(fixture.debugElement.query(By.css('[id="typeahead-name_option_1"]'))).not.toBeNull();
+                    typeahedHTMLElement.focus();
+                    typeaheadWidgetComponent.value = '';
+                    typeahedHTMLElement.dispatchEvent(new Event('keyup'));
+                    typeahedHTMLElement.dispatchEvent(new Event('input'));
+                    fixture.detectChanges();
+                    fixture.whenStable().then(() => {
+                        fixture.detectChanges();
+                        expect(fixture.debugElement.query(By.css('[id="typeahead-name_option_1"]'))).toBeNull();
+                    });
+                });
+            }));
+
+            it('should show error message when the value is not valid', async(() => {
+                typeaheadWidgetComponent.value = 'Fake Name';
+                typeaheadWidgetComponent.field.value = 'Fake Name';
+                typeaheadWidgetComponent.field.options = fakeOptionList;
+                expect(element.querySelector('.adf-error-text')).toBeNull();
+                let keyboardEvent = new KeyboardEvent('keypress');
                 typeaheadWidgetComponent.onKeyUp(keyboardEvent);
                 fixture.detectChanges();
                 fixture.whenStable().then(() => {
-                    expect(fixture.debugElement.queryAll(By.css('[id="md-option-1"]'))).toBeDefined();
-                    expect(fixture.debugElement.queryAll(By.css('[id="md-option-2"]'))).toBeDefined();
-                    expect(fixture.debugElement.queryAll(By.css('[id="md-option-3"]'))).toBeDefined();
+                    fixture.detectChanges();
+                    expect(element.querySelector('.adf-error-text')).not.toBeNull();
+                    expect(element.querySelector('.adf-error-text').textContent).toContain('Invalid data inserted');
                 });
             }));
 
@@ -362,27 +347,6 @@ describe('TypeaheadWidgetComponent', () => {
                     expect(element.querySelector('#typeahead-id')).toBeNull();
                 });
             }));
-
-            it('should show typeahead value when the type is readonly', async(() => {
-                typeaheadWidgetComponent.field = new FormFieldModel(
-                    new FormModel({ taskId: 'fake-task-id', processVariables: [{ name: 'typeahead-id_LABEL', value: 'FakeProcessValue' }] }), {
-                    id: 'typeahead-id',
-                    name: 'typeahead-name',
-                    type: 'readonly',
-                    value: '9',
-                    params: { field: { id: 'typeahead-id', name: 'typeahead-name', type: 'typeahead' } }
-                });
-                fixture.detectChanges();
-                const trigger = fixture.debugElement.query(By.css('.mat-select-trigger')).nativeElement;
-                trigger.click();
-                fixture.detectChanges();
-                fixture.whenStable().then(() => {
-                    expect(element.querySelector('#typeahead-id')).not.toBeNull();
-                    let optionElement: HTMLElement = <HTMLElement> document.body.querySelector('.mat-option');
-                    expect(optionElement.innerText).toEqual('FakeProcessValue');
-                });
-            }));
-
         });
 
         describe('and typeahead is populated via processDefinitionId', () => {
diff --git a/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.ts b/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.ts
index 1d10fca7d5..0a35f61a8c 100644
--- a/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.ts
+++ b/ng2-components/ng2-activiti-form/src/components/widgets/typeahead/typeahead.widget.ts
@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
- /* tslint:disable:component-selector  */
+/* tslint:disable:component-selector  */
 
 import { ENTER, ESCAPE } from '@angular/cdk/keycodes';
 import { Component, OnInit, ViewEncapsulation } from '@angular/core';
@@ -23,7 +23,7 @@ import { LogService } from 'ng2-alfresco-core';
 import { WidgetVisibilityService } from '../../../services/widget-visibility.service';
 import { FormService } from './../../../services/form.service';
 import { FormFieldOption } from './../core/form-field-option';
-import { baseHost , WidgetComponent } from './../widget.component';
+import { baseHost, WidgetComponent } from './../widget.component';
 
 @Component({
     selector: 'typeahead-widget',
@@ -42,7 +42,7 @@ export class TypeaheadWidgetComponent extends WidgetComponent implements OnInit
     constructor(public formService: FormService,
                 private visibilityService: WidgetVisibilityService,
                 private logService: LogService) {
-         super(formService);
+        super(formService);
     }
 
     ngOnInit() {
@@ -51,101 +51,89 @@ export class TypeaheadWidgetComponent extends WidgetComponent implements OnInit
         } else if (this.field.form.processDefinitionId) {
             this.getValuesByProcessDefinitionId();
         }
+        if (this.isReadOnlyType()) {
+            this.value = this.field.value;
+        }
     }
 
     getValuesByTaskId() {
         this.formService
             .getRestFieldValues(
-                this.field.form.taskId,
-                this.field.id
+            this.field.form.taskId,
+            this.field.id
             )
             .subscribe(
-                (result: FormFieldOption[]) => {
-                    let options = result || [];
-                    this.field.options = options;
+            (result: FormFieldOption[]) => {
+                let options = result || [];
+                this.field.options = options;
 
-                    let fieldValue = this.field.value;
-                    if (fieldValue) {
-                        let toSelect = options.find(item => item.id === fieldValue);
-                        if (toSelect) {
-                            this.value = toSelect.name;
-                        }
+                let fieldValue = this.field.value;
+                if (fieldValue) {
+                    let toSelect = options.find(item => item.id === fieldValue);
+                    if (toSelect) {
+                        this.value = toSelect.name;
                     }
-                    this.field.updateForm();
-                    this.visibilityService.refreshEntityVisibility(this.field);
-                },
-                err => this.handleError(err)
+                }
+                this.field.updateForm();
+                this.visibilityService.refreshEntityVisibility(this.field);
+            },
+            err => this.handleError(err)
             );
     }
 
     getValuesByProcessDefinitionId() {
         this.formService
             .getRestFieldValuesByProcessId(
-                this.field.form.processDefinitionId,
-                this.field.id
+            this.field.form.processDefinitionId,
+            this.field.id
             )
             .subscribe(
-                (result: FormFieldOption[]) => {
-                    let options = result || [];
-                    this.field.options = options;
+            (result: FormFieldOption[]) => {
+                let options = result || [];
+                this.field.options = options;
 
-                    let fieldValue = this.field.value;
-                    if (fieldValue) {
-                        let toSelect = options.find(item => item.id === fieldValue);
-                        if (toSelect) {
-                            this.value = toSelect.name;
-                        }
+                let fieldValue = this.field.value;
+                if (fieldValue) {
+                    let toSelect = options.find(item => item.id === fieldValue);
+                    if (toSelect) {
+                        this.value = toSelect.name;
                     }
-                    this.field.updateForm();
-                    this.visibilityService.refreshEntityVisibility(this.field);
-                },
-                err => this.handleError(err)
+                }
+                this.field.updateForm();
+                this.visibilityService.refreshEntityVisibility(this.field);
+            },
+            err => this.handleError(err)
             );
     }
 
     getOptions(): FormFieldOption[] {
-        let val = this.value.toLocaleLowerCase();
+        let val = this.value.trim().toLocaleLowerCase();
         return this.field.options.filter(item => {
             let name = item.name.toLocaleLowerCase();
             return name.indexOf(val) > -1;
         });
     }
 
+    isValidOptionName(optionName: string): boolean {
+        let option = this.field.options.find(item => item.name && item.name.toLocaleLowerCase() === optionName.toLocaleLowerCase());
+        return option ? true : false;
+    }
+
     onKeyUp(event: KeyboardEvent) {
-        if (this.value && this.value.length >= this.minTermLength  && this.oldValue !== this.value) {
+        if (this.value && this.value.trim().length >= this.minTermLength && this.oldValue !== this.value) {
             if (event.keyCode !== ESCAPE && event.keyCode !== ENTER) {
                 if (this.value.length >= this.minTermLength) {
                     this.options = this.getOptions();
                     this.oldValue = this.value;
+                    if (this.isValidOptionName(this.value)) {
+                        this.field.value = this.options[0].id;
+                    }
                 }
             }
         }
-    }
-
-    flushValue() {
-        let options = this.field.options || [];
-        let lValue = this.value ? this.value.toLocaleLowerCase() : null;
-
-        let field = options.find(item => item.name && item.name.toLocaleLowerCase() === lValue);
-        if (field) {
-            this.field.value = field.id;
-            this.value = field.name;
-        } else {
-            this.field.value = null;
-            this.value = null;
-        }
-
-        this.field.updateForm();
-    }
-
-    onItemClick(item: FormFieldOption, event: Event) {
-        if (item) {
-            this.field.value = item.id;
-            this.value = item.name;
-            this.checkVisibility();
-        }
-        if (event) {
-            event.preventDefault();
+        if (this.isValueDefined() && this.value.trim().length === 0) {
+            this.oldValue = this.value;
+            this.options = [];
         }
     }
 
@@ -157,6 +145,14 @@ export class TypeaheadWidgetComponent extends WidgetComponent implements OnInit
         }
     }
 
+    validate() {
+        this.field.value = this.value;
+    }
+
+    isValueDefined() {
+        return this.value !== null && this.value !== undefined;
+    }
+
     handleError(error: any) {
         this.logService.error(error);
     }