431
examples/device/webusb_serial/website/application.js
Normal file
431
examples/device/webusb_serial/website/application.js
Normal file
@@ -0,0 +1,431 @@
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'use strict';
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||||
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||||
(() => {
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||||
const connectBtn = document.getElementById('connect');
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const resetAllBtn = document.getElementById('reset_all');
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||||
const resetOutputBtn = document.getElementById('reset_output');
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const senderLines = document.getElementById('sender_lines');
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const receiverLines = document.getElementById('receiver_lines');
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const commandLine = document.getElementById('command_line');
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const status = document.getElementById('status');
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const newlineModeSelect = document.getElementById('newline_mode');
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const sendModeBtn = document.getElementById('send_mode');
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const autoReconnectCheckbox = document.getElementById('auto_reconnect');
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const forgetDeviceBtn = document.getElementById('forget_device');
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const forgetAllDevicesBtn = document.getElementById('forget_all_devices');
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const nearTheBottomThreshold = 100; // pixels from the bottom to trigger scroll
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let port = null;
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let lastPort = null; // for reconnecting and initial connection
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const history = [];
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let historyIndex = -1;
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let lastCommand = null;
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let lastCommandCount = 0;
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let lastCommandButton = null;
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let sendMode = 'command'; // default mode
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let reconnectIntervalId = null; // track reconnect interval
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// Format incoming data to string based on newline mode
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const decodeData = (() => {
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const decoder = new TextDecoder();
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return dataView => decoder.decode(dataView);
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})();
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// Normalize newline if mode is ANY
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const normalizeNewlines = (text, mode) => {
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switch (mode) {
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case 'CR':
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// Only \r: Replace all \n with \r
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return text.replace(/\r?\n/g, '\r');
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case 'CRLF':
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// Replace lone \r or \n with \r\n
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return text.replace(/\r\n|[\r\n]/g, '\r\n');
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case 'ANY':
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// Accept any \r, \n, \r\n. Normalize as \n for display
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return text.replace(/\r\n|\r/g, '\n');
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default:
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return text;
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}
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};
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// Append line to container, optionally scroll to bottom
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const appendLineToReceiver = (container, text, className = '') => {
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const div = document.createElement('div');
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if (className) div.className = className;
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div.textContent = text;
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container.appendChild(div);
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const distanceFromBottom = container.scrollHeight - (container.scrollTop + container.clientHeight);
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if (distanceFromBottom < nearTheBottomThreshold) {
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requestAnimationFrame(() => {
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div.scrollIntoView({ behavior: "instant" });
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||||
});
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}
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||||
};
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||||
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||||
// Append sent command to sender container as a clickable element
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||||
const appendCommandToSender = (container, text) => {
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if (text === lastCommand) {
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// Increment count and update button
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||||
lastCommandCount++;
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lastCommandButton.textContent = `${text} ×${lastCommandCount}`;
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} else {
|
||||
// Reset count and add new button
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lastCommand = text;
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||||
lastCommandCount = 1;
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||||
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||||
const commandEl = document.createElement('button');
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||||
commandEl.className = 'sender-entry';
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||||
commandEl.type = 'button';
|
||||
commandEl.textContent = text;
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||||
commandEl.addEventListener('click', () => {
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||||
commandLine.value = text;
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||||
commandLine.focus();
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||||
});
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||||
container.appendChild(commandEl);
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||||
lastCommandButton = commandEl;
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||||
const distanceFromBottom = container.scrollHeight - (container.scrollTop + container.clientHeight);
|
||||
if (distanceFromBottom < nearTheBottomThreshold) {
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requestAnimationFrame(() => {
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||||
commandEl.scrollIntoView({ behavior: 'instant' });
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||||
});
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||||
}
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||||
}
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||||
};
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||||
// Update status text and style
|
||||
const setStatus = (msg, level = 'info') => {
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||||
console.log(msg);
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||||
status.textContent = msg;
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status.className = 'status status-' + level;
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||||
};
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// Disconnect helper
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||||
const disconnectPort = async () => {
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||||
if (port) {
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try {
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||||
await port.disconnect();
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||||
} catch (error) {
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||||
setStatus(`Disconnect error: ${error.message}`, 'error');
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||||
}
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||||
port = null;
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||||
connectBtn.textContent = 'Connect';
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||||
commandLine.disabled = true;
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||||
}
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};
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||||
// Connect helper
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||||
const connectPort = async (initial=false) => {
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||||
try {
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||||
let grantedDevices = await serial.getPorts();
|
||||
if (grantedDevices.length === 0 && initial) {
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||||
return false;
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||||
}
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||||
if (grantedDevices.length === 0) {
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// No previously granted devices, request a new one
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setStatus('Requesting device...', 'info');
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port = await serial.requestPort();
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} else {
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||||
if (lastPort) {
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// Try to reconnect to the last used port
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const matchingPort = grantedDevices.find(p => p.portPointToSameDevice(lastPort));
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||||
if (matchingPort) {
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||||
port = matchingPort;
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||||
setStatus('Reconnecting to last device...', 'info');
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} else {
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return false;
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}
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} else {
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// No last port, just use the first available
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||||
port = grantedDevices[0];
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||||
setStatus('Connecting to first device...', 'info');
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||||
}
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}
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await port.connect();
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lastPort = port; // save for reconnecting
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setStatus(`Connected to ${port.device.productName || 'device'}`, 'info');
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connectBtn.textContent = 'Disconnect';
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commandLine.disabled = false;
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commandLine.focus();
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port.onReceive = dataView => {
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||||
let text = decodeData(dataView);
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text = normalizeNewlines(text, newlineModeSelect.value);
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appendLineToReceiver(receiverLines, text, 'received');
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};
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port.onReceiveError = error => {
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setStatus(`Read error: ${error.message}`, 'error');
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// Start auto reconnect on error if enabled
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tryAutoReconnect();
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};
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return true;
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} catch (error) {
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setStatus(`Connection failed: ${error.message}`, 'error');
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port = null;
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connectBtn.textContent = 'Connect';
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commandLine.disabled = true;
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return false;
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}
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};
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// Start auto reconnect interval if checkbox is checked and not already running
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const tryAutoReconnect = () => {
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if (!autoReconnectCheckbox.checked) return;
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if (reconnectIntervalId !== null) return; // already trying
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setStatus('Attempting to auto-reconnect...', 'info');
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reconnectIntervalId = setInterval(async () => {
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if (!autoReconnectCheckbox.checked) {
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clearInterval(reconnectIntervalId);
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reconnectIntervalId = null;
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setStatus('Auto-reconnect stopped.', 'info');
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return;
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}
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await disconnectPort();
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const success = await connectPort();
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if (success) {
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clearInterval(reconnectIntervalId);
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reconnectIntervalId = null;
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setStatus('Reconnected successfully.', 'info');
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}
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}, 1000);
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};
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// Stop auto reconnect immediately
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const stopAutoReconnect = () => {
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if (reconnectIntervalId !== null) {
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clearInterval(reconnectIntervalId);
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reconnectIntervalId = null;
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setStatus('Auto-reconnect stopped.', 'info');
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}
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};
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// Connect button click handler
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connectBtn.addEventListener('click', async () => {
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if (!serial.isWebUsbSupported()) {
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setStatus('WebUSB not supported on this browser', 'error');
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return;
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}
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if (port) {
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// Disconnect
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stopAutoReconnect();
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await disconnectPort();
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setStatus('Disconnected', 'info');
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return;
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}
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stopAutoReconnect();
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try {
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// Connect
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const success = await connectPort();
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if (success) {
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setStatus('Connected', 'info');
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}
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} catch (error) {
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setStatus(`Connection failed: ${error.message}`, 'error');
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port = null;
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connectBtn.textContent = 'Connect';
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commandLine.disabled = true;
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}
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});
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// Checkbox toggle stops auto reconnect if unchecked
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autoReconnectCheckbox.addEventListener('change', () => {
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if (!autoReconnectCheckbox.checked) {
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stopAutoReconnect();
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} else {
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// Start auto reconnect immediately if not connected
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if (!port) {
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tryAutoReconnect();
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}
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}
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});
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sendModeBtn.addEventListener('click', () => {
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if (sendMode === 'command') {
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sendMode = 'instant';
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sendModeBtn.classList.remove('send-mode-command');
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sendModeBtn.classList.add('send-mode-instant');
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sendModeBtn.textContent = 'Instant mode';
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// In instant mode, we clear the command line
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commandLine.value = '';
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} else {
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sendMode = 'command';
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sendModeBtn.classList.remove('send-mode-instant');
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sendModeBtn.classList.add('send-mode-command');
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sendModeBtn.textContent = 'Command mode';
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}
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});
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// Send command line input on Enter
|
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commandLine.addEventListener('keydown', async e => {
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if (!port) return;
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// Instant mode: send key immediately including special keys like Backspace, arrows, enter, etc.
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||||
if (sendMode === 'instant') {
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e.preventDefault();
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// Ignore only pure modifier keys without text representation
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if (e.key.length === 1 ||
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||||
e.key === 'Enter' ||
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||||
e.key === 'Backspace' ||
|
||||
e.key === 'Tab' ||
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||||
e.key === 'Escape' ||
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||||
e.key === 'Delete' ) {
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||||
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let sendText = '';
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switch (e.key) {
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case 'Enter':
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switch (newlineModeSelect.value) {
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case 'CR': sendText = '\r'; break;
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||||
case 'CRLF': sendText = '\r\n'; break;
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default: sendText = '\n'; break;
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}
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break;
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case 'Backspace':
|
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// Usually no straightforward char to send for Backspace,
|
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// but often ASCII DEL '\x7F' or '\b' (0x08) is sent.
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||||
sendText = '\x08'; // backspace
|
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break;
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case 'Tab':
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sendText = '\t';
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||||
break;
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case 'Escape':
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||||
// Ignore or send ESC control char if needed
|
||||
sendText = '\x1B';
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||||
break;
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||||
case 'Delete':
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||||
sendText = '\x7F'; // DEL char
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||||
break;
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||||
default:
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||||
sendText = e.key;
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||||
}
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||||
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||||
const encoder = new TextEncoder();
|
||||
try {
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||||
await port.send(encoder.encode(sendText));
|
||||
} catch (error) {
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||||
setStatus(`Send error: ${error.message}`, 'error');
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||||
tryAutoReconnect();
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||||
}
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||||
}
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||||
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||||
return;
|
||||
}
|
||||
|
||||
// Command mode: handle up/down arrow keys for history
|
||||
if (e.key === 'ArrowUp' || e.key === 'ArrowDown') {
|
||||
e.preventDefault();
|
||||
if (history.length === 0) return;
|
||||
if (e.key === 'ArrowUp') {
|
||||
if (historyIndex === -1) historyIndex = history.length - 1;
|
||||
else if (historyIndex > 0) historyIndex--;
|
||||
} else if (e.key === 'ArrowDown') {
|
||||
if (historyIndex !== -1) historyIndex++;
|
||||
if (historyIndex >= history.length) historyIndex = -1;
|
||||
}
|
||||
commandLine.value = historyIndex === -1 ? '' : history[historyIndex];
|
||||
return;
|
||||
}
|
||||
|
||||
if (e.key !== 'Enter' || !port) return;
|
||||
e.preventDefault();
|
||||
const text = commandLine.value;
|
||||
if (!text) return;
|
||||
|
||||
// Add command to history, ignore duplicate consecutive
|
||||
if (history.length === 0 || history[history.length - 1] !== text) {
|
||||
history.push(text);
|
||||
}
|
||||
historyIndex = -1;
|
||||
|
||||
// Convert to Uint8Array with newline based on config
|
||||
let sendText = text;
|
||||
switch (newlineModeSelect.value) {
|
||||
case 'CR':
|
||||
sendText += '\r';
|
||||
break;
|
||||
case 'CRLF':
|
||||
sendText += '\r\n';
|
||||
break;
|
||||
case 'ANY':
|
||||
sendText += '\n';
|
||||
break;
|
||||
}
|
||||
const encoder = new TextEncoder();
|
||||
const data = encoder.encode(sendText);
|
||||
|
||||
try {
|
||||
await port.send(data);
|
||||
appendCommandToSender(senderLines, sendText.replace(/[\r\n]+$/, ''));
|
||||
commandLine.value = '';
|
||||
} catch (error) {
|
||||
setStatus(`Send error: ${error.message}`, 'error');
|
||||
tryAutoReconnect();
|
||||
}
|
||||
});
|
||||
|
||||
// Forget device button clears stored device info
|
||||
forgetDeviceBtn.addEventListener('click', async () => {
|
||||
if (port) {
|
||||
// Disconnect first
|
||||
await port.disconnect();
|
||||
await port.forgetDevice();
|
||||
stopAutoReconnect();
|
||||
await disconnectPort();
|
||||
|
||||
setStatus('Device forgotten', 'info');
|
||||
} else {
|
||||
setStatus('No device to forget', 'error');
|
||||
}
|
||||
});
|
||||
|
||||
// Forget all devices button clears all stored device info
|
||||
forgetAllDevicesBtn.addEventListener('click', async () => {
|
||||
stopAutoReconnect();
|
||||
await disconnectPort();
|
||||
let ports = await serial.getPorts();
|
||||
if (ports.length > 0) {
|
||||
for (const p of ports) {
|
||||
await p.forgetDevice();
|
||||
}
|
||||
setStatus('All devices forgotten', 'info');
|
||||
} else {
|
||||
setStatus('No devices to forget', 'error');
|
||||
}
|
||||
});
|
||||
|
||||
// Reset output button clears receiver
|
||||
resetOutputBtn.addEventListener('click', () => {
|
||||
receiverLines.innerHTML = '';
|
||||
});
|
||||
|
||||
// Reset button clears sender and receiver
|
||||
resetAllBtn.addEventListener('click', () => {
|
||||
senderLines.innerHTML = '';
|
||||
receiverLines.innerHTML = '';
|
||||
lastCommand = null;
|
||||
lastCommandCount = 0;
|
||||
lastCommandButton = null;
|
||||
});
|
||||
|
||||
|
||||
// Disable input on load
|
||||
commandLine.disabled = true;
|
||||
|
||||
// Show warning if no WebUSB support
|
||||
if (!serial.isWebUsbSupported()) {
|
||||
setStatus('WebUSB not supported on this browser', 'error');
|
||||
} else {
|
||||
// try to connect to any available device
|
||||
connectPort(true);
|
||||
}
|
||||
})();
|
Reference in New Issue
Block a user