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fix: correctly update styles #12946

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fix: correctly update styles #12946

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1ca94f0
fix: correctly update styles
btea Jan 30, 2023
fec64dc
chore: update test
btea Jan 30, 2023
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2 changes: 1 addition & 1 deletion src/platforms/web/runtime/modules/style.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -91,7 +91,7 @@ function updateStyle(oldVnode: VNodeWithData, vnode: VNodeWithData) {
}
for (name in newStyle) {
cur = newStyle[name]
if (cur !== oldStyle[name]) {
if (cur !== oldStyle[name] || !el.style[name]) {
// ie9 setting to null has no effect, must use empty string
setProp(el, name, cur == null ? '' : cur)
}
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8 changes: 8 additions & 0 deletions test/unit/modules/vdom/modules/style.spec.ts
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Expand Up @@ -28,6 +28,14 @@ describe('vdom style module', () => {
expect(elm.style.display).toBe('block')
})

it('border related style should update correctly', () => {
const vnode1 = new VNode('p', { style: { border: '10px solid red', 'border-bottom': '10px solid blue' } })
const vnode2 = new VNode('p', { style: { 'border-right': '10px solid red', 'border-bottom': '10px solid blue' } })
patch(null, vnode1)
const elm = patch(vnode1, vnode2)
expect(elm.style.borderBottom).toBe('10px solid blue')
})

it('should remove elements attrs', () => {
const vnode1 = new VNode('p', { style: { fontSize: '12px' } })
const vnode2 = new VNode('p', { style: { display: 'block' } })
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