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@@ -0,0 +1,103 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+
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+<head>
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+ <meta charset="UTF-8">
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+ <meta http-equiv="X-UA-Compatible" content="IE=edge">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ body {
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+ display: flex;
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+ flex-direction: column;
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+ align-items: center;
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+ }
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+
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+ .msg-container {
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+ display: flex;
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+ flex-direction: column;
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+ width: 400px;
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+ }
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+ </style>
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+</head>
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+
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+<body>
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+ <form>
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+ <input type="text" id="login" placeholder="Name" />
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+ <input type="text" id="message" placeholder="Message" />
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+ <button id="btn">Send</button>
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+ </form>
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+ <div class="msg-container"></div>
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+ <script>
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+ const url = "http://students.a-level.com.ua:10012";
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+
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+ const msgContainer = document.querySelector('.msg-container');
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+ const login = document.querySelector('#login');
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+ const message = document.querySelector('#message');
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+ const btn = document.querySelector('#btn');
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+
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+ let messageId = 0;
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+
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+ async function jsonPost(url, data) {
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+ try {
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+ const response = await fetch(url, {
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+ method: "POST",
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+ body: JSON.stringify(data),
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+ });
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+ const result = response.json();
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+ return response.ok ? result : new Error("status is not 200");
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+ } catch (error) {
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+ return new Error("jsonPost failed");
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+ }
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+ }
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+ async function sendMessage() {
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+ jsonPost(url, {
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+ func: "addMessage",
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+ nick: login.value,
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+ message: message.value,
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+ });
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+ }
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+
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+ async function getMessages() {
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+ let a = await jsonPost(url, {
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+ func: "getMessages",
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+ nick: login.value,
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+ message: message.value,
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+ messageId: messageId,
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+ });
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+ let msgArray = a.data;
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+ msgArray.forEach(msg => {
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+ const text = document.createElement("p")
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+ messageId = a.nextMessageId;
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+ text.innerHTML = `(ID:${messageId}) ${msg.nick}: ${msg.message}`
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+ msgContainer.prepend(text)
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+
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+ });
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+ }
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+
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+ btn.onclick = async function sendAndCheck(e) {
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+ e.preventDefault();
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+ await sendMessage()
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+ await getMessages()
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+ }
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+
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+ const delay = (ms) => new Promise((resolve) => setTimeout(() => resolve(ms), ms));
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+
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+ (async function checkLoop() {
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+ while (true) {
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+ await delay(3000);
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+ getMessages();
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+ }
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+ })();
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+
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+ //async function sendMessage(nick, message) отсылает сообщение.
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+ //async function getMessages() получает сообщения и отрисовывает их в DOM
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+ //async function sendAndCheck() использует две предыдущие для минимизации задержки между отправкой сообщения и приходом их.Именно эта функция должна запускаться по кнопке.
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+ //async function checkLoop() использует delay и бесконечный цикл для периодического запуска getMessages().
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+
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+
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+ </script>
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+
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+</body>
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+
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+</html>
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