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perf: should patch string style when value is changed #1310

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merged 3 commits into from
Jun 11, 2020
Merged

perf: should patch string style when value is changed #1310

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4c31a9e
perf: should patch string style when value is changed
underfin Jun 6, 2020
b59c0d8
test: add test
underfin Jun 7, 2020
ab17967
chore: remove unnecessary exp
underfin Jun 7, 2020
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16 changes: 16 additions & 0 deletions packages/runtime-dom/__tests__/patchStyle.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,22 @@ describe(`runtime-dom: style patching`, () => {
expect(el.style.cssText.replace(/\s/g, '')).toBe('color:red;')
})

// #1309
it('should not patch same string style', () => {
const el = document.createElement('div')
const fn = jest.fn()
const value = (el.style.cssText = 'color:red;')
Object.defineProperty(el.style, 'cssText', {
get(): any {
return value
},
set: fn
})
patchProp(el, 'style', value, value)
expect(el.style.cssText.replace(/\s/g, '')).toBe('color:red;')
expect(fn).not.toBeCalled()
})

it('plain object', () => {
const el = document.createElement('div')
patchProp(el, 'style', {}, { color: 'red' })
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4 changes: 3 additions & 1 deletion packages/runtime-dom/src/modules/style.ts
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Expand Up @@ -8,7 +8,9 @@ export function patchStyle(el: Element, prev: Style, next: Style) {
if (!next) {
el.removeAttribute('style')
} else if (isString(next)) {
style.cssText = next
if (prev !== next) {
style.cssText = next
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can we have a test to cover this pls?

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I'm lazy on it....Yeah. I add test for it.

}
} else {
for (const key in next) {
setStyle(style, key, next[key] as string)
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