Add hasAttr function

d.ts/homey.d.ts

@@ -57,6 +57,7 @@ export function queryAll(element: Element, selector: CSSSelector): Elements;
 export function closest(element: Element, condition: CSSSelector | Predicate): Element | null;
 export function getHtml(element: Element): string;
 export function getText(element: Node): string;
+export function hasAttr(element: Element, attribute: string): boolean;
 export function matches(element: Element, selector: CSSSelector): boolean;
 export function parent(element: Element): Element | null;
 export function parentBy(element: Element, condition: CSSSelector | Predicate): Element | null;

spec/traversing/has-attr.spec.js

@@ -0,0 +1,21 @@
+import { hasAttr } from "../../src";
+
+describe("hasAttr", () => {
+  afterEach(clearFixtures);
+
+  it("returns true if element has a given attribute", () => {
+    useFixture(`<div class="root"></div>`);
+
+    const subject = document.querySelector(".root");
+
+    expect(hasAttr(subject, "class")).toBe(true);
+  });
+
+  it("returns false if element hasn't a given attribute", () => {
+    useFixture(`<div class="root"></div>`);
+
+    const subject = document.querySelector(".root");
+
+    expect(hasAttr(subject, "id")).toBe(false);
+  });
+});

src/index.js

@@ -35,8 +35,10 @@ import setText from "./manipulation/set-text";
 import query from "./quering/query";
 import queryAll from "./quering/query-all";
 import closest from "./traversing/closest";
+import getAttr from "./traversing/get-attr";
 import getHtml from "./traversing/get-html";
 import getText from "./traversing/get-text";
+import hasAttr from "./traversing/has-attr";
 import matches from "./traversing/matches";
 import parent from "./traversing/parent";
 import parentBy from "./traversing/parent-by";
@@ -81,8 +83,10 @@ export {
   query,
   queryAll,
   closest,
+  getAttr,
   getHtml,
   getText,
+  hasAttr,
   matches,
   parent,
   parentBy,

src/traversing/has-attr.js

@@ -0,0 +1,7 @@
+/* @flow */
+
+function hasAttr(element: Element, attribute: string): boolean {
+  return element.hasAttribute(attribute);
+}
+
+export default hasAttr;