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fix(get-ancestry): don't error when there is no parent #4617

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merged 2 commits into from
Oct 17, 2024
Merged

fix(get-ancestry): don't error when there is no parent #4617

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f6737d1
fix(get-ancestry): don't error when there is no parent
straker Oct 17, 2024
521e469
Merge branch 'develop' into fix-get-ancestry
straker Oct 17, 2024
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2 changes: 1 addition & 1 deletion lib/core/utils/get-ancestry.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ function generateAncestry(node) {
if (
nodeName !== 'head' &&
nodeName !== 'body' &&
parentNode.children.length > 1
parentNode?.children.length > 1
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I didn't realize that the optional chaining operation short circuited like this; I got worried that this would need to be parentNode?.children?.length, but it turns out this is fine

) {
const index = Array.prototype.indexOf.call(parentNode.children, node) + 1;
nthChild = `:nth-child(${index})`;
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5 changes: 5 additions & 0 deletions test/core/utils/get-ancestry.js
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Expand Up @@ -26,6 +26,11 @@ describe('axe.utils.getAncestry', () => {
assert.isNotNull(document.querySelector(sel1));
});

it('should not throw when there is no parent', () => {
const node = document.createElement('section');
assert.doesNotThrow(() => axe.utils.getAncestry(node));
});

it('generates selectors of nested shadow trees', () => {
const node = document.createElement('section');
fixture.appendChild(node);
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