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Ensure value for OPTION elements is properly set in edge case (fix #4956) #4959

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merged 2 commits into from Nov 25, 2021
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Ensure value for OPTION elements is properly set in edge case (fix #4956) #4959

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55e8c54
fix(runtime-dom): ensure value is explicitly set on OPTION elements
LinusBorg Nov 17, 2021
19b63f4
Update props.ts
yyx990803 Nov 25, 2021
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3 changes: 3 additions & 0 deletions packages/runtime-dom/__tests__/patchProps.spec.ts
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Expand Up @@ -29,9 +29,12 @@ describe('runtime-dom: props patching', () => {
// so we need to add tests for other elements
test('value for non-text input', () => {
const el = document.createElement('option')
el.textContent = 'foo' // #4956
patchProp(el, 'value', null, 'foo')
expect(el.getAttribute('value')).toBe('foo')
expect(el.value).toBe('foo')
patchProp(el, 'value', null, null)
el.textContent = ''
expect(el.value).toBe('')
// #3475
expect(el.getAttribute('value')).toBe(null)
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8 changes: 7 additions & 1 deletion packages/runtime-dom/src/modules/props.ts
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Expand Up @@ -31,7 +31,13 @@ export function patchDOMProp(
// non-string values will be stringified.
el._value = value
const newValue = value == null ? '' : value
if (el.value !== newValue) {
if (
el.value !== newValue ||
// #4956: always set for OPTION elements because its value falls back to
// textContent if no value attribute is present. And setting .value for
// OPTION has no side effect
el.tagName === 'OPTION'
) {
el.value = newValue
}
if (value == null) {
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