fix(module:input-number): fix display value after formatter changed

components/input-number/nz-input-number.component.ts

@@ -68,6 +68,7 @@ export class NzInputNumberComponent implements ControlValueAccessor, AfterViewIn
   private _step = 1;
   private autoStepTimer;
   private _autoFocus = false;
+  private _formatter = (value) => value;
   displayValue: string | number;
   actualValue: string | number;
   isFocused = false;
@@ -82,7 +83,6 @@ export class NzInputNumberComponent implements ControlValueAccessor, AfterViewIn
   @Input() nzSize: 'small' | 'default' | 'large' = 'default';
   @Input() nzMin: number = -Infinity;
   @Input() nzMax: number = Infinity;
-  @Input() nzFormatter = (value) => value;
   @Input() nzParser = (value) => value;
   @Input() nzPrecision: number;
 
@@ -125,6 +125,16 @@ export class NzInputNumberComponent implements ControlValueAccessor, AfterViewIn
     return this._step;
   }
 
+  @Input()
+  set nzFormatter(v: (value: number) => string | number) {
+    this._formatter = v;
+    this.writeValue(Number(this.actualValue));
+  }
+
+  get nzFormatter(): (value: number) => string | number {
+    return this._formatter;
+  }
+
   updateAutoFocus(): void {
     if (this.isInit) {
       if (this.nzAutoFocus) {

components/input-number/nz-input-number.spec.ts

@@ -366,6 +366,16 @@ describe('input number', () => {
       fixture.detectChanges();
       expect(testComponent.value).toBe(-10);
     });
+    it('should update value immediatelly after formatter changed', (() => {
+      const value = '100';
+      const newFormatter = v => `${v} %`;
+      fixture.detectChanges();
+      testComponent.nzInputNumberComponent.onModelChange(value);
+      fixture.detectChanges();
+      testComponent.formatter = newFormatter;
+      fixture.detectChanges();
+      expect(inputElement.value).toBe(newFormatter(value));
+    }));
   });
   describe('input number form', () => {
     let fixture;