vue3简易对话窗口_vue实现一个聊天对话框

<template>
  <div id="chat-window">
    <ul id="chat-log">
      <li
        v-for="(message, index) in messages"
        :key="index"
        :class="{ received: !message.fromMe }"
      >
        <div class="message-header">{{ message.from }}</div>
        <div class="message-body">{{ message.text }}</div>
      </li>
    </ul>
    <div id="chat-input">
      <textarea v-model="messageText"></textarea>
      <button @click="sendMessage">发送</button>
    </div>
  </div>
</template>

<script lang="ts">
import { defineComponent, ref, nextTick } from "vue";

export default defineComponent({
  name: "ChatWindow",
  setup() {
    const messages = ref<
      Array<{ from: string; text: string; fromMe?: boolean }>
    >([]);
    const messageText = ref<string>("");
    const bol = ref(false);

    function sendMessage() {
      if (messageText.value) {
        if (bol.value) {
          return;
        }
        bol.value = true;
        const newMessage = {
          from: "Me",
          text: "",
          fromMe: true,
        };

        const newMessage1 = {
          from: "You",
          text: "狗",
          fromMe: false,
        };

        messages.value.push(newMessage1);
        messages.value.push(newMessage);
        const originalText = messageText.value;
        // messageText.value = "";

        scrollToBottom(); // 先滚动到底部
        // 等待滚动到底部后再依次显示消息
        nextTick(() => {
          // 定时器每200ms将消息一个一个字符地显示出来
          let currentIndex = 0;
          const timer = setInterval(() => {
            if (currentIndex >= originalText.length) {
              clearInterval(timer);
              nextTick(() => {
                newMessage.text = originalText;
                scrollToBottom(); // 再次滚动到底部
                bol.value = false;
              });
              return;
            }
            const currentText = originalText.substring(0, currentIndex + 1);
            messages.value[messages.value.length - 1].text = currentText;
            scrollToBottom(); // 再次滚动到底部
            currentIndex++;
          }, 200);
        });
      }
    }

    function scrollToBottom() {
      const chatLog = document.getElementById("chat-log");
      if (chatLog) {
        chatLog.scrollTop = chatLog.scrollHeight;
      }
    }

    scrollToBottom(); // 初始化滚动到底部

    return {
      messages,
      messageText,
      sendMessage,
      scrollToBottom,
    };
  },
  mounted() {
    this.scrollToBottom(); // 每次更新聊天记录后滚动到底部
  },
});
</script>

<style>
#chat-window {
  width: 100%;
  height: 100vh;
  border: 1px solid #ccc;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#chat-log {
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
  overflow-y: scroll;
}

#chat-log li {
  margin-bottom: 10px;
  padding: 5px;
  border-radius: 5px;
  display: flex;
  flex-direction: column;
  max-width: 100%;
  /* max-width: 80%; */
  align-items: flex-end;
}

.received {
  /* align-self: flex-end; */
  align-items: flex-start !important;
  background-color: #f5f5f5;
}

.message-header {
  font-size: 14px;
  font-weight: bold;
  margin-bottom: 5px;
}

.message-body {
  font-size: 16px;
  line-height: 1.5;
}

#chat-input {
  display: flex;
  align-items: center;
  padding: 10px;
  background-color: #f5f5f5;
}

#chat-input textarea {
  flex: 1;
  margin-right: 10px;
  border-radius: 5px;
  padding: 5px;
  font-size: 16px;
  border: 1px solid #ccc;
}

#chat-input button {
  background-color: #007bff;
  color: #fff;
  padding: 5px 10px;
  border-radius: 5px;
  border: none;
  cursor: pointer;
  font-size: 16px;
}
</style>

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