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Enable resize events for when the bottom boundary target is an element #1024

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Enable resize events for when the bottom boundary target is an element #1024

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10 changes: 10 additions & 0 deletions src/Sticky.jsx
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ let M;
let scrollDelta = 0;
let win;
let winHeight = -1;
let resizeObserver;

class Sticky extends Component {
constructor(props, context) {
Expand Down Expand Up @@ -98,6 +99,15 @@ class Sticky extends Component {
if (!this.bottomBoundaryTarget) {
this.bottomBoundaryTarget = doc.querySelector(boundary);
}
if (this.bottomBoundaryTarget) {
if (!resizeObserver) {
resizeObserver = new ResizeObserver(() => {
this.updateInitialDimension();
this.update();
});
}
resizeObserver.observe(this.bottomBoundaryTarget);
}
boundary = this.getTargetBottom(this.bottomBoundaryTarget);
}
return boundary && boundary > 0 ? boundary : Infinity;
Expand Down