React InfiniteScroll in a scrollable component on the page

Question

I am trying to build an infinite scroll in a div with a fixed height and a scroll attached to it, so my goal is for the window not to move but a component within to have a scroll and the items within to be added infinatly.

this is what i have so far:

import React, { useState } from "react";
import ReactDOM from "react-dom";
import InfiniteScroll from "react-infinite-scroll-component";

const style = {
  height: 18,
  border: "1px solid green",
  margin: 6,
  padding: 8
};

const DoseListCardBody = () => {
  const [items, setItems] = useState(Array.from({ length: 20 }));

  const fetchMoreData = () => {
    setItems(items.concat(Array.from({ length: 10 })));
  };

  return (
    <div style={{ height: "100%", overflowY: "scroll" }}>
      <InfiniteScroll
        dataLength={items.length}
        next={fetchMoreData}
        hasMore={items.length < 200}
        loader={<h4>Loading...</h4>}
      >
        {items.map((i, index) => (
          <div style={style} key={index}>
            div - #{index}
          </div>
        ))}
      </InfiniteScroll>
    </div>
  );
};

ReactDOM.render(
  <div style={{ height: "35rem", background: "black" }}>
    <div style={{ height: "30rem", background: "white" }}>
      <DoseListCardBody />
    </div>
  </div>,
  document.getElementById("root")
);

everything works fine if i change

ReactDOM.render(
  <div style={{ height: "35rem", background: "black" }}>
    <div style={{ height: "30rem", background: "white" }}>
      <DoseListCardBody />
    </div>
  </div>,
  document.getElementById("root")
);

to

ReactDOM.render(
  <DoseListCardBody />,
  document.getElementById("root")
);

I think this is because it is using the scroll of the window not the component.

How do i get InfiniteScroll to use the parent component or a component with a scroll that I specify.

I appologise for the bad terminology, i dont usualy develop web pages.

Answer 1

ok got it!

one must use scrollableTarget as a prop in the InfiniteScroll and specify the ID of the compnent that has the scrollbar.

example:

const DoseListCardBody = () => {
  const [items, setItems] = useState(Array.from({ length: 20 }));

  const fetchMoreData = () => {
    setItems(items.concat(Array.from({ length: 10 })));
  };

  return (
    <div id="scrollableDiv" style={{ height: "100%", overflowY: "scroll" }}>
      <InfiniteScroll
        dataLength={items.length}
        next={fetchMoreData}
        hasMore={items.length < 200}
        loader={<h4>Loading...</h4>}
        scrollableTarget="scrollableDiv"
      >
        {items.map((i, index) => (
          <div style={style} key={index}>
            div - #{index}
          </div>
        ))}
      </InfiniteScroll>
    </div>
  );
};

notice the addition of 'id="scrollableDiv"' and 'scrollableTarget="scrollableDiv"'.