留言表单实战

留言表单实战

html代码

<div class="mess">
        <div class="messt">留言板</div>
        <div class="messc">
            <div><label for="title">请输入留言内容</label>
                <br>
                <input type="text" id="title" class="mess_text" onkeydown="addMsg(this)" placeholder="输入Enter或者点击提交按钮"
                    value="" />
            </div>
            <div><button onclick="msg()">提交留言</button></div>
        </div>
    </div>
    <div class="lycon">
        <div class="messt">留言内容展示</div>
        <div class="messc">
            <ul class="lylist">
            </ul>
        </div>
    </div>

css代码

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
a {
  text-decoration: none;
  color: #555;
}
li {
  list-style: none;
}
.mess,
.lycon {
  width: 560px;
  margin: 100px auto 0 auto;
  background-color: #f8f8f8;
  border-radius: 5px;
}
.mess .messt,
.lycon .messt {
  width: 100%;
  height: 65px;
  line-height: 65px;
  padding: 0 40px;
  background-color: #9fc560;
  color: #fff;
  font-size: 20px;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
}
.messc {
  padding: 40px;
}
.messc input[type="text"] {
  width: 100%;
  height: 35px;
  border: 1px #e5e5e5 solid;
  margin: 10px 0 20px 0;
  text-indent: 10px;
  font-size: 14px;
  color: #333;
}
.messc button {
  width: 100px;
  height: 35px;
  text-align: center;
  line-height: 35px;
  border: 0;
  background-color: #9fc560;
  color: #fff;
  border-radius: 3px;
  cursor: pointer;
}
.messc button:hover {
  background-color: #739e2b;
  color: #fff;
}
.lycon {
  margin: 20px auto;
}
.lycon .messt {
  height: 40px;
  line-height: 40px;
  font-size: 16px;
  background-color: #7aa534;
}
.lylist button {
  margin-left: 12px;
}
.lylist li {
  margin-bottom: 10px;
}

js代码

<script>
        function addMsg(tit) {
            if (event.key === 'Enter') {
                const ul = document.querySelector('.lylist');
                if (tit.value.trim().length === 0) {
                    alert("留言不能为空！");
                    tit.focus();
                    return false;
                }
                const li = document.createElement('li');
                li.innerHTML = tit.value + '<button onclick="del(this.parentNode)">删除</button';
                ul.insertAdjacentElement('afterBegin', li);
                tit.value = null;
                tit.focus();
            }
        }
        function msg() {
            const ul = document.querySelector('.lylist');
            const tit = document.querySelector('.mess_text');
            //console.log(tit);
            if (tit.value.trim().length === 0) {
                alert("留言不能为空！");
                tit.focus();
                return false;
            }
            const li = document.createElement('li');
            li.innerHTML = tit.value + '<button onclick="del(this.parentNode)">删除</button';
            ul.insertAdjacentElement('afterBegin', li);
            tit.value = null;
            tit.focus();
        }
        function del(tit) {
            return confirm('是否删除？') ? tit.remove() : false;
        }
    </script>

效果图