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fix(cdk/scrolling): Prevents NaN being returned as firstVisibleIndex. #21505

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Merged
annieyw merged 1 commit into from
Jan 9, 2021
Merged

fix(cdk/scrolling): Prevents NaN being returned as firstVisibleIndex. #21505

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3 changes: 2 additions & 1 deletion src/cdk/scrolling/fixed-size-virtual-scroll.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,8 @@ export class FixedSizeVirtualScrollStrategy implements VirtualScrollStrategy {
const viewportSize = this._viewport.getViewportSize();
const dataLength = this._viewport.getDataLength();
let scrollOffset = this._viewport.measureScrollOffset();
let firstVisibleIndex = scrollOffset / this._itemSize;
// Prevent NaN as result when dividing by zero.
let firstVisibleIndex = (this._itemSize > 0) ? scrollOffset / this._itemSize : 0;

// If user scrolls to the bottom of the list and data changes to a smaller list
if (newRange.end > dataLength) {
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