145 lines
4.2 KiB
HTML
145 lines
4.2 KiB
HTML
<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>pizzacalc</title>
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<style>
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body {
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display: flex;
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flex-direction: column;
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align-items: center;
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font-family: sans-serif;
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background-color: #501f3a;
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color: #ccc;
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padding: 0px 10px;
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}
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h1 {
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font-weight: normal;
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padding: 15px 20px;
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border-bottom: 5px solid #ccc;
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border-top: 5px solid #cb2d6f;
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}
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p {
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line-height: 1.5;
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text-align: justify;
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max-width: 600px;
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}
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table {
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border-collapse: collapse;
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margin-top: 20px;
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}
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tr {
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padding: 10px;
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}
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th {
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padding-bottom: 10px;
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}
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td {
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padding: 5px;
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text-align: center;
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}
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input[type="text"] {
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width: 110px;
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padding: 10px;
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background-color: #ccc;
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color: #501f3a;
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border: none;
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}
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</style>
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</head>
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<body>
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<h1>pizzacalc</h1>
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<p>Ever wondered which pizza size from your local delivery service is the cheapest per area unit? Fill out the table below and find out.</p>
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<p>Units are up to you but keep them consistent across the table. <b>Dimension</b> can be either the diameter of the pizza or the edge length in the form WIDTHxHEIGHT.</p>
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<table id="pizza-table">
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<tr><th>Dimension</th><th>Price</th><th>Price per Area Unit²</th></tr>
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<tr><td><input type="text" placeholder="Diameter, WxH" onchange="rebuild()"></td><td><input type="text" placeholder="Price" onchange="rebuild()"></td><td></td></tr>
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</table>
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<script>
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table = document.getElementById("pizza-table");
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function cleanTable() {
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// Iterate backwards through table rows
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for (var i = table.rows.length - 1; i > 0; i--) {
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var row = table.rows[i];
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// Clear color
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row.style.backgroundColor = "#501f3a";
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row.style.fontWeight = "normal";
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// Delete empty rows
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var area = row.cells[0].getElementsByTagName("input")[0].value.trim();
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var price = row.cells[1].getElementsByTagName("input")[0].value.trim();
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if (area == "" && price == "") {
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table.deleteRow(i);
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}
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}
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}
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function recalculate() {
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var minPrice = Infinity;
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// Iterate over table rows
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for (var i = 1, row; row = table.rows[i]; i++) {
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// Get area as array
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var areaArray = row.cells[0].getElementsByTagName("input")[0].value.toLowerCase().replace(",", ".").split("x");
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// Calculate area of round pizza
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if (areaArray.length == 1) {
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var area = (areaArray[0] / 2) ** 2 * Math.PI;
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}
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// Calculate area of rectangular pizza
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else {
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var area = areaArray[0] * areaArray[1];
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}
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// Calculate price if possible
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var price = row.cells[1].getElementsByTagName("input")[0].value.replace(",", ".");
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var result = row.cells[2];
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if (area != "" && !isNaN(area) && price != "" && !isNaN(price)) {
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var pricePerArea = Number((price / area).toFixed(4))
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result.innerHTML = pricePerArea;
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if (pricePerArea < minPrice) {
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minPrice = pricePerArea;
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}
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}
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else {
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result.innerHTML = "";
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}
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}
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// Set color of cheapest prices
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for (var i = 1, row; row = table.rows[i]; i++) {
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if (row.cells[2].innerHTML == minPrice) {
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row.style.backgroundColor = "#cb2d6f";
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row.style.fontWeight = "bold";
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}
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}
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}
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function addEmptyRow() {
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// Add empty row to end of table
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table.insertRow(-1);
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table.rows[table.rows.length - 1].innerHTML = '<td><input type="text" placeholder="Diameter, WxH" onchange="rebuild()"></td><td><input type="text" placeholder="Price" onchange="rebuild()"></td><td></td>';
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}
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function rebuild() {
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cleanTable();
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recalculate();
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addEmptyRow();
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}
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</script>
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</body>
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</html>
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