Displaying Differences in CSS Styles: A Memo
2019-02-10 15:23 (5 years ago)
ytyng
Displaying CSS Style Differences
<script>
var styleSnapshots = [];
var classNames = {};
var styleParams = [
'height',
'width',
'margin',
'padding',
'position',
'top',
'bottom',
'lineHeight',
];
function getStyleData(element){
var data = {};
var cs = window.getComputedStyle(element);
// console.log(cs);
for(var param of styleParams){
data[param] = cs[param];
}
return data;
}
function snapshot(snapshotIndex, path, element) {
if (styleSnapshots.length <= snapshotIndex) {
styleSnapshots[snapshotIndex] = {};
}
classNames[path] = element.getAttribute('class');
styleSnapshots[snapshotIndex][path] = getStyleData(element);
var children = element.children;
for (var i = 0; i < children.length; i++) {
var child = children[i];
var tagName = child.tagName;
var path2 = `${path}${tagName}[${i}]/`;
snapshot(snapshotIndex, path2, child);
}
}
function diffSnapshot(i0, i1) {
for (var path in styleSnapshots[i1]) {
if (!styleSnapshots[i0][path]) {
console.log(`${path} before undefined`);
continue;
}
if (!styleSnapshots[i1][path]) {
console.log(`${path} after undefined`);
continue;
}
var className = classNames[path];
for (var sp of styleParams) {
if (styleSnapshots[i0][path][sp] != styleSnapshots[i1][path][sp]) {
console.log(`${path} ${className} ${sp} ${styleSnapshots[i0][path][sp]} -> ${styleSnapshots[i1][path][sp]}`);
}
}
}
}
snapshot(0, '/', document.querySelector('.navlist'));
setTimeout(function () {
snapshot(1, '/', document.querySelector('.navlist'));
diffSnapshot(0, 1);
}, 3000);
</script>
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