javascript-game-practices/table.html at master · fptudsc/javascript-game-practices · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		table {
		  border: 2px solid #3b9393;
		}

		thead th {
		  background-color: #54d2d2;
		  color: #fff;
		  cursor: pointer;
		}

		thead {
		  display: block;
		}

		tbody {
		  display: block;
		  max-height: 500px;
		  overflow-y: scroll;

		}

		td, th {
		  width: 40px;
		  height: 40px;
		  background-color: #d9ffff;
		  text-align: center;
		  border: 1px solid #ddd;
		  color: #735e3b;
		  font-family: Roboto;
		}
	</style>
</head>
<body>
	<form action="#">
	    <label for="row">
	    Row
	    <input type="text" name="row" class="row" id="row" value="1000">
	  </label>
	  <label for="col">
	    Column
	    <input type="text" name="col" class="col" id="col" value="16">
	  </label>
	  <button type="submit" class="create">Create</button>
	</form>
	<br>
	<table class="table">
	  <thead></thead>
	  <tbody></tbody>
	</table>
</body>
<script>
	const table = document.querySelector('.table');
	const form = document.querySelector('form');
	const thead = document.querySelector('thead');
	const tbody = document.querySelector('tbody');

	let data = [];
	let sortedDate = [];
	let isSorted = false;
	let sortCol = null;
	let lastRenderedRow = 0;
	let row = 0;
	let col = 0;

	generateData();
	renderHeader();
	renderData(data, lastRenderedRow, 100);

	form.addEventListener('submit', e => {
		e.preventDefault();
	  generateData();

	  tbody.textContent = '';
	  tbody.scrollTop = 0;
	  lastRenderedRow = 0;
	  renderHeader();
	  renderData(data, lastRenderedRow, 100);
	});
	tbody.addEventListener('scroll', renderNewRows);

	function generateData() {
	  row = form.elements.row.value;
	  col = form.elements.col.value;

	  data = Array.from({ length: row }, () => Array.from({ length: col}, () => randNum(1, 1000)));
	}

	function renderHeader() {
		thead.innerHTML = '<tr>'
	  	+ Array.from({ length: col }, (v, i) => `<th class="sort-col" data-col="${i}">${i}</th>`).join('')
	    + '</tr>';

	  document.querySelectorAll('.sort-col').forEach(c => c.addEventListener('click', sortDataByCol));
	}

	function renderData(data, minRow, maxRow) {
		for (let r = minRow; r < row && r < maxRow; r++) {
	  	const rowElement = document.createElement('tr');

	  	for (let c = 0; c < col; c++) {
	    	const colElement = document.createElement('td');
	      colElement.textContent = data[r][c];

	      rowElement.appendChild(colElement);
	    }
	    tbody.appendChild(rowElement);
	  }

	  lastRenderedRow = maxRow;
	}

	function renderNewRows(e) {
		if (tbody.scrollTop + tbody.clientHeight === tbody.scrollHeight) {
	  	if (isSorted)
	  		renderData(sortedData, lastRenderedRow, lastRenderedRow + 100);
	    else
	    	renderData(data, lastRenderedRow, lastRenderedRow + 100);
	  }
	}

	function sortDataByCol(e) {
		const c = this.dataset.col;
		isSorted = true;
	  sortCol = c;
	  sortedData = data.sort((a, b) => a[c] - b[c]);
	  tbody.textContent = '';
	  tbody.scrollTop = 0;
	  lastRenderedRow = 0;
	  renderData(sortedData, lastRenderedRow, 100);
	}

	function randNum(min, max) {
		return Math.floor(Math.random() * (max - min) + min);
	}
</script>
</html>