add html extra for webusb example

2021-08-05 14:06:08 +07:00
parent 2b521e0c10
commit b5d218e684
6 changed files with 323 additions and 1 deletions
@@ -0,0 +1,90 @@
+(function() {
+  'use strict';
+
+  document.addEventListener('DOMContentLoaded', event => {
+    let connectButton = document.querySelector("#connect");
+    let statusDisplay = document.querySelector('#status');
+    let port;
+
+    function addLine(linesId, text) {
+      var senderLine = document.createElement("div");
+      senderLine.className = 'line';
+      var textnode = document.createTextNode(text);
+      senderLine.appendChild(textnode);
+      document.getElementById(linesId).appendChild(senderLine);
+      return senderLine;
+    }
+
+    let currentReceiverLine;
+
+    function appendLine(linesId, text) {
+      if (currentReceiverLine) {
+        currentReceiverLine.innerHTML =  currentReceiverLine.innerHTML + text;
+      } else {
+        currentReceiverLine = addLine(linesId, text);
+      }
+    }
+
+    function connect() {
+      port.connect().then(() => {
+        statusDisplay.textContent = '';
+        connectButton.textContent = 'Disconnect';
+
+        port.onReceive = data => {
+          let textDecoder = new TextDecoder();
+          console.log(textDecoder.decode(data));
+          if (data.getInt8() === 13) {
+            currentReceiverLine = null;
+          } else {
+            appendLine('receiver_lines', textDecoder.decode(data));
+          }
+        };
+        port.onReceiveError = error => {
+          console.error(error);
+        };
+      }, error => {
+        statusDisplay.textContent = error;
+      });
+    }
+
+    connectButton.addEventListener('click', function() {
+      if (port) {
+        port.disconnect();
+        connectButton.textContent = 'Connect';
+        statusDisplay.textContent = '';
+        port = null;
+      } else {
+        serial.requestPort().then(selectedPort => {
+          port = selectedPort;
+          connect();
+        }).catch(error => {
+          statusDisplay.textContent = error;
+        });
+      }
+    });
+
+    serial.getPorts().then(ports => {
+      if (ports.length === 0) {
+        statusDisplay.textContent = 'No device found.';
+      } else {
+        statusDisplay.textContent = 'Connecting...';
+        port = ports[0];
+        connect();
+      }
+    });
+
+
+    let commandLine = document.getElementById("command_line");
+
+    commandLine.addEventListener("keypress", function(event) {
+      if (event.keyCode === 13) {
+        if (commandLine.value.length > 0) {
+          addLine('sender_lines', commandLine.value);
+          commandLine.value = '';
+        }
+      }
+
+      port.send(new TextEncoder('utf-8').encode(String.fromCharCode(event.which || event.keyCode)));
+    });
+  });
+})();