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Topmost visible section instead of closest above center #2340

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Topmost visible section instead of closest above center #2340

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62 changes: 31 additions & 31 deletions Radzen.Blazor/wwwroot/Radzen.Blazor.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2574,37 +2574,37 @@ window.Radzen = {

this.unregisterScrollListener(element);
element.scrollHandler = () => {
const center = (container.tagName === 'HTML' ? 0 : container.getBoundingClientRect().top) + container.clientHeight / 2;

let min = Number.MAX_SAFE_INTEGER;
let match;

for (let i = 0; i < elements.length; i++) {
const element = elements[i];
if (!element) continue;

const rect = element.getBoundingClientRect();
const diff = Math.abs(rect.top - center);

if (!match && rect.top < center) {
match = selectors[i];
min = diff;
continue;
}

if (match && rect.top >= center) continue;

if (diff < min) {
match = selectors[i];
min = diff;
}
}

if (match !== currentSelector) {
currentSelector = match;
this.navigateTo(currentSelector, false);
ref.invokeMethodAsync('ScrollIntoView', currentSelector);
}
const contTop = container.tagName === 'HTML' ? 0 : container.getBoundingClientRect().top;
const center = contTop + container.clientHeight / 2;
let min = Number.MAX_SAFE_INTEGER;
let match;
for (let i = 0; i < elements.length; i++) {
const element = elements[i];
if (!element) continue;
const rect = element.getBoundingClientRect();
if (!match && rect.top < center) {
match = selectors[i];
min = rect.top;
continue;
}
if (match && rect.top >= center) continue;
if (match && (min < contTop || rect.top < min && rect.top >= contTop)) {
match = selectors[i];
min = rect.top;
}
}
if (match !== currentSelector) {
currentSelector = match;
this.navigateTo(currentSelector, false);
ref.invokeMethodAsync('ScrollIntoView', currentSelector);
}
};

document.addEventListener('scroll', element.scrollHandler, true);
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