jsfun/binaryconvertor.html at main · jamesabela/jsfun · GitHub

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<!DOCTYPE html>
<html>
<head>
  <title>8-bit Converter</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 20px;
    }
    .result {
      margin-top: 10px;
    }
    .workings {
      margin-top: 20px;
      font-family: monospace;
    }
    .slider-container {
      margin-bottom: 20px;
    }
    #binaryInput {
      background-color: #99ccff;
    }
    #hexadecimalInput {
      background-color: #99ff99;
    }
    table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 20px;
    }
    table, th, td {
      border: 1px solid black;
    }
    th, td {
      text-align: center;
      padding: 8px;
    }
    .step2-table {
      margin-top: 10px;
      border: 1px solid black;
      border-collapse: collapse;
      width: 100%;
    }
    .step2-table td, .step2-table th {
      border: 1px solid black;
      padding: 5px;
      text-align: center;
    }
  </style>
</head>
<body>

<h2>8-bit Converter</h2>

<div>
  <label for="mode">Mode:</label>
  <input type="radio" id="unsigned" name="mode" value="unsigned" checked onchange="toggleTwosComplement()"> Unsigned
  <input type="radio" id="twosComplement" name="mode" value="twosComplement" onchange="toggleTwosComplement()"> Two's Complement
</div>
<br>

<div class="slider-container">
  <label for="decimalInput">Decimal (Slider):</label>
  <input type="range" id="decimalInput" min="0" max="255" value="0" oninput="convertFromDecimal()">
  <span id="decimalValue">0</span>
</div>

<div class="slider-container">
  <label for="decimalTextInput">Decimal (Input):</label>
  <input type="number" id="decimalTextInput" min="-128" max="255" value="0" oninput="convertFromTextInput()">
</div>

<div class="slider-container">
  <label for="binaryInput">Binary:</label>
  <input type="range" id="binaryInput" min="0" max="255" value="0" oninput="convertFromBinary()">
  <span id="binaryValue">0000 0000</span>
</div>

<div class="slider-container">
  <label for="hexadecimalInput">Hexadecimal:</label>
  <input type="range" id="hexadecimalInput" min="0" max="255" value="0" oninput="convertFromHexadecimal()">
  <span id="hexadecimalValue">00</span>
</div>

<div class="result" id="conversionResult"></div>
<div class="workings" id="conversionWorkings"></div>

<table>
  <tr>
    <th>Bit</th>
    <td id="bit0">0</td>
    <td id="bit1">0</td>
    <td id="bit2">0</td>
    <td id="bit3">0</td>
    <td id="bit4">0</td>
    <td id="bit5">0</td>
    <td id="bit6">0</td>
    <td id="bit7">0</td>
  </tr>
  <tr>
    <th>Place Value</th>
    <td>2<sup>7</sup></td>
    <td>2<sup>6</sup></td>
    <td>2<sup>5</sup></td>
    <td>2<sup>4</sup></td>
    <td>2<sup>3</sup></td>
    <td>2<sup>2</sup></td>
    <td>2<sup>1</sup></td>
    <td>2<sup>0</sup></td>
  </tr>
  <tr>
    <th>Value</th>
    <td>128</td>
    <td>64</td>
    <td>32</td>
    <td>16</td>
    <td>8</td>
    <td>4</td>
    <td>2</td>
    <td>1</td>
  </tr>
  <tr>
    <th>Hexadecimal</th>
    <td colspan="4" id="hex0">0</td>
    <td colspan="4" id="hex1">0</td>
  </tr>
</table>

<p>With thanks to Su Young for the binary workings algorithm and Adit for the idea to include a text input.</p>

<script>
  function toggleTwosComplement() {
    const twosComplement = document.getElementById("twosComplement").checked;
    const decimalInput = document.getElementById("decimalInput");
    const decimalTextInput = document.getElementById("decimalTextInput");

    if (twosComplement) {
      decimalInput.min = -128;
      decimalInput.max = 127;
      decimalTextInput.min = -128;
      decimalTextInput.max = 127;
    } else {
      decimalInput.min = 0;
      decimalInput.max = 255;
      decimalTextInput.min = 0;
      decimalTextInput.max = 255;
    }

    // Update the conversion based on the current slider or text input value
    convertFromDecimal();
  }

  function clearWorkings() {
    document.getElementById("conversionWorkings").innerHTML = "";
  }

  function convertFromDecimal() {
    clearWorkings();
    let decimal = parseInt(document.getElementById("decimalInput").value);
    document.getElementById("decimalTextInput").value = decimal;
    handleConversion(decimal);
  }

  function convertFromTextInput() {
    clearWorkings();
    let decimal = parseInt(document.getElementById("decimalTextInput").value);
    document.getElementById("decimalInput").value = decimal;
    handleConversion(decimal);
  }

  function handleConversion(decimal) {
    const twosComplement = document.getElementById("twosComplement").checked;

    document.getElementById("decimalValue").innerText = decimal;
    if (isNaN(decimal) || decimal < (twosComplement ? -128 : 0) || decimal > (twosComplement ? 127 : 255)) {
      document.getElementById("conversionResult").innerText = `Please enter a valid decimal number between ${twosComplement ? -128 : 0} and ${twosComplement ? 127 : 255}.`;
      document.getElementById("conversionWorkings").innerText = "";
      return;
    }

    let binary;
    if (twosComplement && decimal < 0) {
      binary = (256 + decimal).toString(2).padStart(8, '0');
    } else {
      binary = decimal.toString(2).padStart(8, '0');
    }

    let hexadecimal = parseInt(binary, 2).toString(16).toUpperCase().padStart(2, '0');
    document.getElementById("binaryInput").value = parseInt(binary, 2);
    document.getElementById("binaryValue").innerText = binary.slice(0, 4) + " " + binary.slice(4);
    document.getElementById("hexadecimalInput").value = parseInt(binary, 2);
    document.getElementById("hexadecimalValue").innerText = hexadecimal;
    displayConversions(decimal, binary, hexadecimal);
    showDetailedWorkings(decimal);
    updateBinaryTable(binary);
    updateHexadecimalTable(hexadecimal);
  }

  function convertFromBinary() {
    clearWorkings();
    let binaryValue = parseInt(document.getElementById("binaryInput").value);
    const binary = binaryValue.toString(2).padStart(8, '0');
    const twosComplement = document.getElementById("twosComplement").checked;

    document.getElementById("binaryValue").innerText = binary.slice(0, 4) + " " + binary.slice(4);
    if (isNaN(binaryValue) || binaryValue < 0 || binaryValue > 255) {
      document.getElementById("conversionResult").innerText = "Please enter a valid 8-bit binary number.";
      document.getElementById("conversionWorkings").innerText = "";
      return;
    }

    let decimal = parseInt(binary, 2);
    if (twosComplement && binary[0] === '1') {
      decimal = decimal - 256;
    }

    let hexadecimal = parseInt(binary, 2).toString(16).toUpperCase().padStart(2, '0');
    document.getElementById("decimalInput").value = decimal;
    document.getElementById("decimalTextInput").value = decimal;
    document.getElementById("decimalValue").innerText = decimal;
    document.getElementById("hexadecimalInput").value = parseInt(binary, 2);
    document.getElementById("hexadecimalValue").innerText = hexadecimal;
    displayConversions(decimal, binary, hexadecimal);
    updateBinaryTable(binary);
    updateHexadecimalTable(hexadecimal);
  }

  function convertFromHexadecimal() {
    clearWorkings();
    let hexadecimalValue = parseInt(document.getElementById("hexadecimalInput").value);
    const hexadecimal = hexadecimalValue.toString(16).toUpperCase().padStart(2, '0');
    const twosComplement = document.getElementById("twosComplement").checked;

    document.getElementById("hexadecimalValue").innerText = hexadecimal;
    if (isNaN(hexadecimalValue) || hexadecimalValue < 0 || hexadecimalValue > 255) {
      document.getElementById("conversionResult").innerText = "Please enter a valid 2-digit hexadecimal number.";
      document.getElementById("conversionWorkings").innerText = "";
      return;
    }

    let decimal = parseInt(hexadecimal, 16);
    const binary = decimal.toString(2).padStart(8, '0');
    if (twosComplement && binary[0] === '1') {
      decimal = decimal - 256;
    }

    document.getElementById("decimalInput").value = decimal;
    document.getElementById("decimalTextInput").value = decimal;
    document.getElementById("decimalValue").innerText = decimal;
    document.getElementById("binaryInput").value = parseInt(binary, 2);
    document.getElementById("binaryValue").innerText = binary.slice(0, 4) + " " + binary.slice(4);
    displayConversions(decimal, binary, hexadecimal);
    updateBinaryTable(binary);
    updateHexadecimalTable(hexadecimal);
  }

  function displayConversions(decimal, binary, hexadecimal) {
    document.getElementById("conversionResult").innerHTML = `
            <strong>Conversions:</strong><br>
            Decimal: ${decimal}<br>
            Binary: ${binary.slice(0, 4)} ${binary.slice(4)}<br>
            Hexadecimal: ${hexadecimal}<br>
        `;
  }

  function showDetailedWorkings(decimal) {
    const twosComplement = document.getElementById("twosComplement").checked;
    let workings = "";
    const line = Array(8).fill(' ');

    // Only show steps 1 and 2 for unsigned or non-negative two's complement numbers
    if (!twosComplement || (twosComplement && decimal >= 0)) {
      workings += "Step 1: Continuously divide the number by 2, noting down the quotient and remainder each time, until the quotient reaches 0.<br><br>";

      // Step 1
      let n = decimal;
      let depth = 0;
      let step1Results = [];
      while (n > 0) {
        step1Results.push(`${n}/2 = ${Math.floor(n / 2)} remainder ${n % 2}<br>`);
        n = Math.floor(n / 2);
        depth++;
      }
      step1Results.forEach(result => workings += result);

      // Step 2
      n = decimal;
      depth = 7;
      workings += "<br><br>Step 2: Write the numbers in order from right to left.<br><br>";
      workings += `<table class="step2-table"><tr><th>Division</th><th colspan="8">Binary Representation</th></tr>`;
      while (n > 0) {
        line[depth] = (n % 2).toString();
        workings += `<tr><td>${n}/2</td>`;
        for (let i = 0; i < 8; i++) {
          workings += `<td>${line[i]}</td>`;
        }
        workings += `</tr>`;
        n = Math.floor(n / 2);
        depth--;
      }
      workings += `</table>`;
    }

    // Step 3 (Show for unsigned binary and positive two's complement numbers)
    if (!twosComplement || (twosComplement && decimal > 0)) {
      if (line.includes(' ')) {
        workings += "<br>Step 3: Add the 0s and check you have 8 numbers<br><br>";
        for (let i = 0; i < 8; i++) {
          if (line[i] === ' ') {
            line[i] = '0';
          }
        }
        workings += `<table class="step2-table"><tr>`;
        for (let i = 0; i < 8; i++) {
          workings += `<td>${line[i]}</td>`;
        }
        workings += `</tr></table>`;
      }
    }

    // Final Answer
    const binaryResult = line.join(' ');

    // Display the results
    document.getElementById("conversionWorkings").innerHTML = workings;
    document.getElementById("binaryValue").innerText = binaryResult;
  }

  function updateBinaryTable(binary) {
    for (let i = 0; i < 8; i++) {
      document.getElementById(`bit${i}`).innerText = binary[i];
    }
  }

  function updateHexadecimalTable(hexadecimal) {
    document.getElementById('hex0').innerText = hexadecimal[0];
    document.getElementById('hex1').innerText = hexadecimal[1];
  }

  // Initial call to display the default value
  convertFromDecimal();
</script>
<script async defer src="https://scripts.simpleanalyticscdn.com/latest.js"></script>
<noscript><img src="https://queue.simpleanalyticscdn.com/noscript.gif" alt="" referrerpolicy="no-referrer-when-downgrade" /></noscript>
</body>
</html>