tictactoe: Track API change that /move event now has data named "move"

[lmno.games] / tictactoe / tictactoe.jsx

diff --git a/tictactoe/tictactoe.jsx b/tictactoe/tictactoe.jsx
index eff7eff32f6df572437130d0ec2c0e8ecf8c2a7b..25c8a9f887742312c4537fca678823628be1190d 100644 (file)
--- a/tictactoe/tictactoe.jsx
+++ b/tictactoe/tictactoe.jsx
@@ -1,3 +1,40 @@
+function undisplay(element) {
+  element.style.display="none";
+}
+
+function add_message(severity, message) {
+  message = `<div class="message ${severity}" onclick="undisplay(this)">
+<span class="hide-button" onclick="undisplay(this.parentElement)">&times;</span>
+${message}
+</div>`;
+  const message_area = document.getElementById('message-area');
+  message_area.insertAdjacentHTML('beforeend', message);
+}
+
+const events = new EventSource("events");
+
+events.onerror = function(event) {
+  if (event.target.readyState === EventSource.CLOSED) {
+      add_message("danger", "Connection to server lost.");
+  }
+};
+
+events.addEventListener("move", event => {
+  const square = JSON.parse(event.data);
+
+  window.game.receiveMove(square);
+});
+
+events.addEventListener("game-state", event => {
+  const state = JSON.parse(event.data);
+
+  window.game.resetState();
+
+  for (let square of state.moves) {
+    window.game.receiveMove(square);
+  }
+});
+
 function Square(props) {
   return (
     <button className="square" onClick={props.onClick}>
@@ -39,6 +76,17 @@ class Board extends React.Component {
   }
 }
 
+function fetch_post_json(api = '', data = {}) {
+  const response = fetch(api, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json'
+    },
+    body: JSON.stringify(data)
+  });
+  return response;
+}
+
 class Game extends React.Component {
   constructor(props) {
     super(props);
@@ -53,7 +101,23 @@ class Game extends React.Component {
     };
   }
 
-  handleClick(i) {
+  sendMove(i) {
+    return fetch_post_json("move", { move: i });
+  }
+
+  resetState() {
+    this.setState({
+      history: [
+        {
+          squares: Array(9).fill(null)
+        }
+      ],
+      stepNumber: 0,
+      xIsNext: true
+    });
+  }
+
+  receiveMove(i) {
     const history = this.state.history.slice(0, this.state.stepNumber + 1);
     const current = history[history.length - 1];
     const squares = current.squares.slice();
@@ -72,6 +136,17 @@ class Game extends React.Component {
     });
   }
 
+  async handleClick(i) {
+    const response = await this.sendMove(i);
+    if (response.status == 200) {
+      const legal = await response.json();
+      if (! legal)
+        add_message("danger", `Illegal move.`);
+    } else {
+      add_message("danger", `Error occurred sending move`);
+    }
+  }
+
   jumpTo(step) {
     this.setState({
       stepNumber: step,
@@ -84,17 +159,6 @@ class Game extends React.Component {
     const current = history[this.state.stepNumber];
     const winner = calculateWinner(current.squares);
 
-    const moves = history.map((step, move) => {
-      const desc = move ?
-        'Go to move #' + move :
-        'Go to game start';
-      return (
-        <li key={move}>
-          <button onClick={() => this.jumpTo(move)}>{desc}</button>
-        </li>
-      );
-    });
-
     let status;
     if (winner) {
       status = "Winner: " + winner;
@@ -104,16 +168,15 @@ class Game extends React.Component {
 
     return (
       <div className="game">
+        <div className="game-info">
+          <div>{status}</div>
+        </div>
         <div className="game-board">
           <Board
             squares={current.squares}
             onClick={i => this.handleClick(i)}
           />
         </div>
-        <div className="game-info">
-          <div>{status}</div>
-          <ol>{moves}</ol>
-        </div>
       </div>
     );
   }
@@ -121,7 +184,9 @@ class Game extends React.Component {
 
 // ========================================
 
-ReactDOM.render(<Game />, document.getElementById("tictactoe"));
+ReactDOM.render(<Game
+                  ref={(me) => window.game = me}
+                />, document.getElementById("tictactoe"));
 
 function calculateWinner(squares) {
   const lines = [