html简单实现b站评论回车发布

心已赠人 2024-03-17 11:43 12阅读 0赞

头像：

![9cb127a518f645718977be7968534776.png][]

<!DOCTYPE html>
    <html lang="en">
    
    <head>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>评论回车发布</title>
      <style>
        .wrapper {
          min-width: 400px;
          max-width: 800px;
          display: flex;
          justify-content: flex-end;
        }
    
        .avatar {
          width: 48px;
          height: 48px;
          border-radius: 50%;
          overflow: hidden;
          background: url(./images/avatar.jpg) no-repeat center / cover;
          margin-right: 20px;
        }
    
        .wrapper textarea {
          outline: none;
          border-color: transparent;
          resize: none;
          background: #f5f5f5;
          border-radius: 4px;
          flex: 1;
          padding: 10px;
          transition: all 0.5s;
          height: 30px;
        }
    
        .wrapper textarea:focus {
          border-color: #e4e4e4;
          background: #fff;
          height: 50px;
        }
    
        .wrapper button {
          background: #00aeec;
          color: #fff;
          border: none;
          border-radius: 4px;
          margin-left: 10px;
          width: 70px;
          cursor: pointer;
        }
    
        .wrapper .total {
          margin-right: 80px;
          color: #999;
          margin-top: 5px;
          opacity: 0;
          transition: all 0.5s;
        }
    
        .list {
          min-width: 400px;
          max-width: 800px;
          display: flex;
        }
    
        .list .item {
          width: 100%;
          display: flex;
        }
    
        .list .item .info {
          flex: 1;
          border-bottom: 1px dashed #e4e4e4;
          padding-bottom: 10px;
        }
    
        .list .item p {
          margin: 0;
        }
    
        .list .item .name {
          color: #FB7299;
          font-size: 14px;
          font-weight: bold;
        }
    
        .list .item .text {
          color: #333;
          padding: 10px 0;
        }
    
        .list .item .time {
          color: #999;
          font-size: 12px;
        }
      </style>
    </head>
    
    <body>
      <div class="wrapper">
        <i class="avatar"></i>
        <textarea id="tx" placeholder="发一条友善的评论" rows="2" maxlength="200"></textarea>
        <button>发布</button>
      </div>
      <div class="wrapper">
        <span class="total">0/200字</span>
      </div>
      <div class="list">
        <div class="item" style="display: none;">
          <i class="avatar"></i>
          <div class="info">
            <p class="name">Big_Peng</p>
            <p class="text">大家都辛苦啦，感谢各位大大的努力，能圆满完成真是太好了[笑哭][支持]</p>
            <p class="time">2023-07-01 20:29:21</p>
          </div>
        </div>
      </div>
    
    
      <script>
        const textarea = document.querySelector('.wrapper textarea')
        const span = document.querySelector('.wrapper .total')
        const item = document.querySelector('.item')
        const text = document.querySelector('.text')
        const btn = document.querySelector('button')
    
        // 1.获得焦点
        textarea.addEventListener('focus',function(){
          span.style.opacity =  1
        })
    
        // 2.失去焦点
        textarea.addEventListener('blur',function(){
          span.style.opacity =  0
        })
    
        // 显示下方字数
        textarea.addEventListener('input',function(){
          const num = textarea.value.length
          span.innerText = `${num}/200字`
        })
    
        textarea.addEventListener('keyup',function(e){
          if(e.key === 'Enter') {
            if(textarea.value.trim() !== '') {
              item.style.display = 'block'
              text.innerHTML = textarea.value
            }
            textarea.value = ''
          }
        })
    
        btn.addEventListener('click',function(){
          if(textarea.value.trim() !== '') {
              item.style.display = 'block'
              text.innerHTML = textarea.value
            }
            textarea.value = ''
        })
    
      </script>
    </body>
    
    </html>

[9cb127a518f645718977be7968534776.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/9af3e8e8f7604eea827b9e5aed1477eb.png