fix: [#1563] Prevent disabled inputs from being focussed or blurred

Author: karpiuMG

packages/happy-dom/src/nodes/html-element/HTMLElementUtility.ts

@@ -16,7 +16,11 @@ export default class HTMLElementUtility {
 		const target = element[PropertySymbol.proxy] || element;
 		const document = target[PropertySymbol.ownerDocument];
 
-		if (document[PropertySymbol.activeElement] !== target || !target[PropertySymbol.isConnected]) {
+		if (
+			document[PropertySymbol.activeElement] !== target ||
+			!target[PropertySymbol.isConnected] ||
+			target.disabled
+		) {
 			return;
 		}
 
@@ -53,7 +57,11 @@ export default class HTMLElementUtility {
 		const target = element[PropertySymbol.proxy] || element;
 		const document = target[PropertySymbol.ownerDocument];
 
-		if (document[PropertySymbol.activeElement] === target || !target[PropertySymbol.isConnected]) {
+		if (
+			document[PropertySymbol.activeElement] === target ||
+			!target[PropertySymbol.isConnected] ||
+			target.disabled
+		) {
 			return;
 		}
 

packages/happy-dom/test/nodes/html-input-element/HTMLInputElement.test.ts

@@ -1158,6 +1158,30 @@ describe('HTMLInputElement', () => {
 		});
 	});
 
+	describe('disabled input', () => {
+		it("doesn't focus the input when it's disabled", () => {
+			document.body.appendChild(element);
+			element.focus();
+			expect(element).toBe(document.activeElement);
+			element.blur();
+			expect(element).not.toBe(document.activeElement);
+			element.disabled = true;
+			element.focus();
+			expect(element).not.toBe(document.activeElement);
+		});
+
+		it("doesn't blur the input when it's disabled", () => {
+			document.body.appendChild(element);
+			element.focus();
+			expect(element).toBe(document.activeElement);
+			element.blur();
+			expect(element).not.toBe(document.activeElement);
+			element.disabled = true;
+			element.blur();
+			expect(element).not.toBe(document.activeElement);
+		});
+	});
+
 	describe('setRangeText()', () => {
 		it('Sets a range text with selection mode set to "preserve".', () => {
 			element.value = 'TEST_VALUE';