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fix(material/slider): some screen readers announcing long decimal values #20721

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Merged
merged 1 commit into from
Oct 7, 2020
Merged

fix(material/slider): some screen readers announcing long decimal values #20721

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10 changes: 10 additions & 0 deletions src/material/slider/slider.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -507,6 +507,16 @@ describe('MatSlider', () => {
expect(sliderInstance.value).toBe(0.3);
});

it('should set the truncated value to the aria-valuetext', () => {
fixture.componentInstance.step = 0.1;
fixture.detectChanges();

dispatchSlideEventSequence(sliderNativeElement, 0, 0.333333);
fixture.detectChanges();

expect(sliderNativeElement.getAttribute('aria-valuetext')).toBe('33');
});

});

describe('slider with auto ticks', () => {
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7 changes: 7 additions & 0 deletions src/material/slider/slider.ts
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Expand Up @@ -134,6 +134,13 @@ const _MatSliderMixinBase:
'[attr.aria-valuemax]': 'max',
'[attr.aria-valuemin]': 'min',
'[attr.aria-valuenow]': 'value',

// NVDA and Jaws appear to announce the `aria-valuenow` by calculating its percentage based
// on its value between `aria-valuemin` and `aria-valuemax`. Due to how decimals are handled,
// it can cause the slider to read out a very long value like 0.20000068 if the current value
// is 0.2 with a min of 0 and max of 1. We work around the issue by setting `aria-valuetext`
// to the same value that we set on the slider's thumb which will be truncated.
'[attr.aria-valuetext]': 'displayValue',
'[attr.aria-orientation]': 'vertical ? "vertical" : "horizontal"',
'[class.mat-slider-disabled]': 'disabled',
'[class.mat-slider-has-ticks]': 'tickInterval',
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