ws-siemens/static/script.js

const dataNode = document.getElementById('data');
const ctx = document.getElementById('chart');
const table = document.getElementById('table');
const target = document.getElementById('target');

const socket = new WebSocket('ws://127.0.0.1:1234');

socket.addEventListener('open', (e) => {
  console.log('connection opened');
});

socket.addEventListener('close', (e) => {
  console.log('connection closed');
});

Chart.defaults.set('plugins.streaming', {
  duration: 20000,
});

const data = [];
const labels = [];
const targets = [];

const chart = new Chart(ctx, {
  type: 'line',
  data: {
    labels,
    datasets: [
      {
        label: 'Value',
        data: data,
        borderWidth: 1,
      },
      {
        label: 'Target',
        data: targets,
        borderWidth: 1,
      },
    ],
  },
  options: {
    animations: false,
    scales: {
      y: {
        beginAtZero: true,
      },
    },
  },
});

chart.resize(1300, 600);

function updateTable(data) {
  if (table.rows.length == 20) {
    table.rows[table.rows.length - 1].remove();
  }

  const tr = table.insertRow(1);
  tr.innerHTML = `
    <td>${new Date().toLocaleString()}</td>
    <td>${data}</td>
  `;
}

socket.addEventListener('message', (e) => {
  const value = Math.round(parseInt(e.data) / 2.83) / 100;

  dataNode.innerText = value;
  data.push(value);
  labels.push(new Date().toLocaleString());
  if (data.length > 100) {
    data.shift();
    labels.shift();
    targets.shift();
  }

  chart.update();

  updateTable(value);

  targets.push(target.value);
});