Merge pull request #3035 from brampeirs/number-input-validation

feat: enhance increment and decrement functionality number component

src/number-input/number.component.spec.ts

@@ -108,6 +108,29 @@ describe("Number", () => {
 		buttonUp.click();
 		fixture.detectChanges();
 		expect(component.value).toEqual(2);
+	});	
+
+	it("should increment and set value to max if value + step exceeds max", () => {
+		fixture.detectChanges();
+		buttonUp = fixture.debugElement.query(By.css(".up-icon")).nativeElement;
+		component.value = 95;
+		component.step = 10;
+		component.max = 100;
+		buttonUp.click();
+		fixture.detectChanges();
+		expect(component.value).toEqual(100);
+	});
+
+	it("should increment and set value to min if value + step is less than min", () => {
+		fixture.detectChanges();
+		buttonUp = fixture.debugElement.query(By.css(".up-icon")).nativeElement;
+		component.value = 0;
+		component.step = 2;
+		component.min = 5;
+		buttonUp.click();
+		fixture.detectChanges();
+
+		expect(component.value).toBe(5);		
 	});
 
 	it("should not increment value if max is reached", () => {
@@ -129,6 +152,29 @@ describe("Number", () => {
 		expect(component.value).toEqual(0);
 	});
 
+	it("should decrement and set value to max if value - step exceeds max", () => {
+		fixture.detectChanges();
+		buttonUp = fixture.debugElement.query(By.css(".down-icon")).nativeElement;
+		component.value = 20;
+		component.step = 2;
+		component.max = 15;
+		buttonUp.click();
+		fixture.detectChanges();
+
+		expect(component.value).toBe(15);		
+	});
+
+	it("should decrement and set value to min if value - step is less than min", () => {
+		fixture.detectChanges();
+		buttonUp = fixture.debugElement.query(By.css(".down-icon")).nativeElement;
+		component.value = 6;
+		component.step = 2;
+		component.min = 5;
+		buttonUp.click();
+		fixture.detectChanges();
+		expect(component.value).toEqual(5);
+	});	
+
 	it("should not decrement value min is reached", () => {
 		fixture.detectChanges();
 		buttonUp = fixture.debugElement.query(By.css(".down-icon")).nativeElement;

src/number-input/number.component.ts

@@ -352,6 +352,23 @@ export class NumberComponent implements ControlValueAccessor {
 	 * Adds `step` to the current `value`.
 	 */
 	onIncrement(): void {
+		// if max is set and value + step is greater than max, set value to max
+		// example: max = 100, step = 10, value = 95 , value + step = 105, value will be set to 100 (max) instead of 105
+		if (this.max !== null && this.value + this.step > this.max) {
+			this.value = this.max;
+			this.emitChangeEvent();
+			return;
+		}
+
+		// if min is set and value + step is less than min, set value to min
+		// example: min = 5, step = 2, value = 0, value + step = 2, value will be set to 5 (min) instead of 2
+		if (this.min !== null && this.value + this.step < this.min) {
+			this.value = this.min;
+			this.emitChangeEvent();
+			return;
+		}
+
+		// if max is not set or value + step is less than max, increment value by step
 		if (this.max === null || this.value + this.step <= this.max) {
 			this.value += this.step;
 			this.value = parseFloat(this.value.toPrecision(this.precision));
@@ -363,6 +380,23 @@ export class NumberComponent implements ControlValueAccessor {
 	 * Subtracts `step` to the current `value`.
 	 */
 	onDecrement(): void {
+		// if max is set and value - step is greater than max, set value to max
+		// example: max = 15, step = 2, value = 20, value - step = 18, value will be set to 15 (max) instead of 18
+		if (this.max !== null && this.value - this.step > this.max) {
+			this.value = this.max;
+			this.emitChangeEvent();
+			return;
+		}
+
+		// if min is set and value - step is less than min, set value to min
+		// example: min = 5, step = 2, value = 6, value - step = 4, value will be set to 5 (min) instead of 4
+		if (this.min !== null && this.value - this.step < this.min) {
+			this.value = this.min;
+			this.emitChangeEvent();
+			return;
+		}
+
+		// if min is not set or value - step is greater than min, decrement value by step
 		if (this.min === null || this.value - this.step >= this.min) {
 			this.value -= this.step;
 			this.value = parseFloat(this.value.toPrecision(this.precision));

src/number-input/number.stories.ts

@@ -1,13 +1,14 @@
 /* tslint:disable variable-name */
 
 import { moduleMetadata, Meta } from "@storybook/angular";
+import { FormsModule } from "@angular/forms";
 import { NumberModule, NumberComponent } from "./";
 
 export default {
 	title: "Components/Number Input",
 	decorators: [
 		moduleMetadata({
-			imports: [NumberModule]
+			imports: [NumberModule, FormsModule]
 		})
 	],
 	args: {
@@ -35,7 +36,9 @@ export default {
 		theme: {
 			options: ["light", "dark"],
 			control: "radio"
-		}
+		},
+		// Actions
+		change: { action: 'changed'}
 	},
 	component: NumberComponent
 } as Meta;
@@ -57,7 +60,8 @@ const Template = (args) => ({
 			[size]="size"
 			[readonly]="readonly"
 			[disabled]="disabled"
-			[fluid]="fluid">
+			[fluid]="fluid"
+			(change)="change($event)">
 		</cds-number>
 	`
 });
@@ -86,7 +90,8 @@ const ModelTemplate = (args) => ({
 			[warnText]="warnText"
 			[disabled]="disabled"
 			[(ngModel)]="value"
-			[fluid]="fluid">
+			[fluid]="fluid"
+			(change)="change($event)">
 		</cds-number>
 		{{ value }}
 	`
@@ -100,7 +105,8 @@ const SkeletonTemplate = (args) => ({
 		<cds-number
 			label="Number input label"
 			skeleton="true"
-			[fluid]="fluid">
+			[fluid]="fluid"
+			(change)="change($event)">
 		</cds-number>
 	`
 });