fix(simple-combo): preserve selection on blur when filtering & selecting an item

Author: RivaIvanova

projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.spec.ts

@@ -895,6 +895,21 @@ describe('IgxSimpleCombo', () => {
             expect(combo.selection.length).toEqual(0);
         });
 
+        it('should not clear selection on tab/blur after filtering and selecting a value', () => {
+            UIInteractions.simulateTyping('con', input);
+            expect(combo.comboInput.value).toEqual('con');
+            fixture.detectChanges();
+
+            UIInteractions.triggerKeyDownEvtUponElem('Enter', input.nativeElement);
+            expect(combo.selection.length).toEqual(1);
+            expect(combo.value).toEqual('Wisconsin');
+
+            UIInteractions.triggerEventHandlerKeyDown('Tab', input);
+            fixture.detectChanges();
+            expect(combo.selection.length).toEqual(1);
+            expect(combo.value).toEqual('Wisconsin');
+        });
+
         it('should display the AddItem button when allowCustomValues is true and there is a partial match', fakeAsync(() => {
             fixture.componentInstance.allowCustomValues = true;
             fixture.detectChanges();
@@ -1118,7 +1133,7 @@ describe('IgxSimpleCombo', () => {
 
             item1.triggerEventHandler('click', UIInteractions.getMouseEvent('click'));
             fixture.detectChanges();
-            expect(combo.value).toBe(null);
+            expect(combo.value).toBe('');
 
             combo.open();
             fixture.detectChanges();
@@ -1145,7 +1160,7 @@ describe('IgxSimpleCombo', () => {
 
             item5.triggerEventHandler('click', UIInteractions.getMouseEvent('click'));
             fixture.detectChanges();
-            expect(combo.value).toBe(undefined);
+            expect(combo.value).toBe('');
         });
 
         it('should select falsy values except "undefined"', () => {

projects/igniteui-angular/src/lib/simple-combo/simple-combo.component.ts

@@ -439,7 +439,7 @@ export class IgxSimpleComboComponent extends IgxComboBaseDirective implements Co
             argsSelection = Array.isArray(argsSelection) ? argsSelection : [argsSelection];
             this.selectionService.select_items(this.id, argsSelection, true);
             if (this._updateInput) {
-                this.comboInput.value = this._internalFilter = this._value = displayText !== args.displayText
+                this.comboInput.value = this._internalFilter = this._value = this.searchValue = displayText !== args.displayText
                     ? args.displayText
                     : this.createDisplayText(argsSelection, [args.oldSelection]);
             }
@@ -457,7 +457,7 @@ export class IgxSimpleComboComponent extends IgxComboBaseDirective implements Co
 
         if (this.displayKey !== null && this.displayKey !== undefined
             && newSelection.length > 0) {
-            return this.convertKeysToItems(newSelection).map(e => e[this.displayKey])[0];
+            return this.convertKeysToItems(newSelection).map(e => e[this.displayKey])[0]?.toString() || '';
         }
 
         return newSelection[0]?.toString() || '';