I have been struggling with react-virtualised docs They have full-featured example tables.
All I want is simple infinite scrolling for my table. Please if anyone can help.
I just want to render my content when it's visible on the screen.
NOTE: I am not pulling the data from any API I have static data(an array of objects) saved into my local folder.
Please see a screenshot of my app below.
Below is my code.
const renderRows = items.map((data, index) => {
return (
<tr
className="table__row"
key={data.id}
onClick={() => onRowClick(data.id)}
>
<td style={{ marginRight: '2px' }}>
<img
onClick={(e) => {
toggleStarSelect(e, data.id);
}}
src={Star}
className="star"
alt="star"
style={{ padding: '2px' }}
/>
{data['#']}
</td>
<td>
<ImageLoadHandler
isloaded={isloaded}
handleImage={handleImage}
data={data}
/>
<span style={{ padding: '10px' }}>{data.Name}</span>
<span
style={{
backgroundColor: 'lightgray',
opacity: '0.5',
fontSize: '13px',
}}
>
{data.Symbol}
</span>
</td>
<td>{data.Price}</td>
<td>{data['1h']}</td>
<td className={data['24h'] > 0 ? 'green' : 'red'}>
{data['24h'] > 0 ? (
<img className="arrowicon" src={SortUpGreen} alt="sort-up-green" />
) : (
<img className="arrowicon" src={SortDownRed} alt="sort-down-red" />
)}
{data['24h']}%
</td>
<td>{data['7d']}</td>
<td>{data['Mkt Cap']}</td>
<td>{data['24h Vol']}</td>
<td style={{ padding: '0', paddingRight: '8px' }}>
<Suspense fallback={<div className="loading">loading...</div>}>
<Graph data={data} idx={index} />
</Suspense>
</td>
</tr>
);
});
return (
<div className="app">
<header>
<Header />
</header>
<table className="app__table">
<thead className="app__tablehead">
<tr>
<th
onClick={() => requestSort('#')}
className={getClassNamesFor('#')} //returns ascending or descending
>
#
</th>
<th
onClick={() => requestSort('Name')}
className={getClassNamesFor('Name')}
>
Coin
</th>
<th
onClick={() => requestSort('Price')}
className={getClassNamesFor('Price')}
>
Price
</th>
<th
onClick={() => requestSort('1h')}
className={getClassNamesFor('1h')}
>
1h
</th>
<th
onClick={() => requestSort('24h')}
className={getClassNamesFor('24h')}
>
24h
</th>
<th
onClick={() => requestSort('7d')}
className={getClassNamesFor('7d')}
>
7d
</th>
<th
onClick={() => requestSort('Mkt Cap')}
className={getClassNamesFor('Mkt Cap')}
>
Mkt Cap
</th>
<th
onClick={() => requestSort('24h Vol')}
className={getClassNamesFor('24h Vol')}
>
24h Vol
</th>
<th className="nohover">Last 7 days</th>
</tr>
</thead>
<tbody>{renderRows}</tbody>
</table>
</div>
);
A working example of infinite scroll on a table element. Also a working a repl.
import React, {useState, useEffect} from 'react';
import './App.css';
function App() {
let items = [];
for (let i = 0; i < 100; i++) {
items.push({
key: 'foo' + i,
value: 'bar' + i,
});
}
let dataTable = React.createRef();
const [list, setList] = useState({
itemsDisplayed: 20,
data: items.slice(0, 20),
});
let onScroll = () => {
let tableEl = dataTable.current;
if (tableEl.scrollTop === (tableEl.scrollHeight - tableEl.offsetHeight)) {
if (list.itemsDisplayed + 10 <= items.length) {
setList({
itemsDisplayed: list.itemsDisplayed + 10,
data: items.slice(0, list.itemsDisplayed + 10),
});
}
}
};
return (
<div className="App">
<table id="data-table" ref={dataTable} onScroll={onScroll}>
<tbody>
{list.data.map((item) => {
return (
<tr key={item.key}>
{item.value}
</tr>
);
})}
</tbody>
</table>
</div>
);
}
export default App;
Also to mention, the problem of scrolling firing only once solved by this question. The point is to use React's built-in onScroll event.