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馃悰 [amp-carousel 0.1] Fix snapping and closing race #32695

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Feb 23, 2021
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5 changes: 4 additions & 1 deletion extensions/amp-carousel/0.1/slidescroll.js
Original file line number Diff line number Diff line change
Expand Up @@ -686,7 +686,10 @@ export class AmpSlideScroll extends BaseSlides {
*/
showSlide_(newIndex) {
const {noOfSlides_} = this;
newIndex = dev().assertNumber(newIndex);
if (isNaN(newIndex)) {
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From the stack trace, this looks like we're fixing the issue in the wrong place. We're getting a NaN from getNextSlideIndex_ (called from updateOnScroll_).

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Thanks for the catch. I'll add the check there as well.

dev().error(TAG, 'Attempted to show slide that is not a number');
return;
}
if (
newIndex < 0 ||
newIndex >= noOfSlides_ ||
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23 changes: 22 additions & 1 deletion extensions/amp-carousel/0.1/test/test-slidescroll.js
Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,8 @@ import {
createElementWithAttributes,
whenUpgradedToCustomElement,
} from '../../../../src/dom';
import {dev, user} from '../../../../src/log';
import {installResizeObserverStub} from '../../../../testing/resize-observer-stub';
import {user} from '../../../../src/log';

describes.realWin(
'SlideScroll',
Expand Down Expand Up @@ -1271,6 +1271,27 @@ describes.realWin(
expect(showSlideSpy).to.have.been.calledWith(4);
});

it('should error on a non-number goToSlide', async () => {
const ampSlideScroll = await getAmpSlideScroll(true);
const impl = await ampSlideScroll.getImpl();
const devErrorSpy = env.sandbox.spy(dev(), 'error');

impl.showSlideAndTriggerAction_(NaN);
expect(devErrorSpy).to.be.calledOnce;
expect(devErrorSpy.args[0][1]).to.match(
/Attempted to show slide that is not a number/
);
});

it('should return false for invalid slide number', async () => {
const ampSlideScroll = await getAmpSlideScroll(true);
const impl = await ampSlideScroll.getImpl();

impl.noOfSlides_ = 10;
expect(impl.showSlide_(Infinity)).to.be.false;
expect(impl.showSlide_(-Infinity)).to.be.false;
});

it('should NOT call showSlide_ before layout', async () => {
const ampSlideScroll = await getAmpSlideScroll(
true,
Expand Down