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#666 support css variables #827

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#666 support css variables #827

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0f08806
Merge branch 'master' of https://github.com/developit/preact
May 19, 2017
eec3951
Merge branch 'master' of https://github.com/developit/preact
Aug 22, 2017
8a8e685
#666 - Add support for CSS Custom Properties
Aug 22, 2017
7273c81
- optimize for size and perf in cases when a css property starts
Aug 23, 2017
b98bc18
- use setProperty instead of removeProperty to optimize for gzip
Aug 24, 2017
7cbcc0d
Merge branch 'master' into 666-support-css-variables
developit Aug 24, 2017
db44005
Merge branch 'master' into 666-support-css-variables
developit May 22, 2018
79ca673
fix tests
developit May 22, 2018
d9bca90
Merge branch 'master' into 666-support-css-variables
tkh44 May 29, 2018
b2c742e
Merge branch 'master' into 666-support-css-variables
developit Aug 16, 2018
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15 changes: 13 additions & 2 deletions src/dom/index.js
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Expand Up @@ -52,10 +52,21 @@ export function setAccessor(node, name, old, value, isSvg) {
}
if (value && typeof value==='object') {
if (typeof old!=='string') {
for (let i in old) if (!(i in value)) node.style[i] = '';
for (let i in old) if (!(i in value)) {
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Challenge: https://twitter.com/preactjs/status/998981752130588673

if (value && typeof value==='object') {
  let i; // placeholder
  if (typeof old!=='string') {
    for (i in old) {
      if (!(i in value)) node.style.setProperty(i, '');
    }
  }
  for (i in value) {
    node.style.setProperty(i, typeof value[i]==='number' && IS_NON_DIMENSIONAL.test(i)===false ? (value[i]+'px') : value[i]);
  }
}

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This would be backwards incompatible. Doesn't work for properties that are defined using camel-casing.

node.style.backgroundColor = value; // works
node.style['background-color'] = value; // works
node.style.setProperty('background-color', value); // works
node.style.setProperty('backgroundColor', value); // doesn't work

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@PepsRyuu aye, saw this after 🙈 /delete

if (i.indexOf('--') === 0) {
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I think we can always use setProperty() / removeProperty() here, which saves a bunch of bytes. AFAIK style.setProperty('color', 'red') is equivalent to style.color='red'.

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@developit developit Aug 23, 2017 •
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just re-read the original thread, i was wrong since setProperty() uses CSS case rather than camelCase. poop! one option would be if (~i.indexOf('-')), which might be neat since it also enables support for css-case in general.

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Damn GitHub collapsing comments. Missed this

node.style.removeProperty(i);
} else {
node.style[i] = '';
}
}
}
for (let i in value) {
node.style[i] = typeof value[i]==='number' && IS_NON_DIMENSIONAL.test(i)===false ? (value[i]+'px') : value[i];
if (i.indexOf('--') === 0) {
node.style.setProperty(i, value[i]);
}
else {
node.style[i] = typeof value[i]==='number' && IS_NON_DIMENSIONAL.test(i)===false ? (value[i]+'px') : value[i];
}
}
}
}
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13 changes: 8 additions & 5 deletions test/browser/render.js
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Expand Up @@ -239,10 +239,11 @@ describe('render()', () => {
});

it('should apply style as String', () => {
render(<div style="top:5px; position:relative;" />, scratch);
render(<div style="top:5px; position:relative; --var-font-size: 12px; font-size: var(--var-font-size);" />, scratch);
expect(scratch.childNodes[0]).to.have.deep.property('style.cssText')
.that.matches(/top\s*:\s*5px\s*/)
.and.matches(/position\s*:\s*relative\s*/);
.and.matches(/position\s*:\s*relative\s*/)
.and.matches(/--var-font-size\s*:\s*12px\s*/);
});

it('should only register on* functions as handlers', () => {
Expand Down Expand Up @@ -356,7 +357,8 @@ describe('render()', () => {
'background-size': 'cover',
padding: 5,
top: 100,
left: '100%'
left: '100%',
'--var-font-size': '12px'
}}>
test
</div>
Expand All @@ -370,12 +372,13 @@ describe('render()', () => {
expect(style).to.have.property('padding', '5px');
expect(style).to.have.property('top', '100px');
expect(style).to.have.property('left', '100%');
expect(style.getPropertyValue('--var-font-size')).to.equal('12px');

root = render((
<div style={{ color: 'rgb(0, 255, 255)' }}>test</div>
<div style={{ color: 'rgb(0, 255, 255)', '--var-font-size': '24px' }}>test</div>
), scratch, root);

expect(root).to.have.deep.property('style.cssText').that.equals('color: rgb(0, 255, 255);');
expect(root).to.have.deep.property('style.cssText').that.equals('color: rgb(0, 255, 255); --var-font-size:24px;');

root = render((
<div style="display: inline;">test</div>
Expand Down