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基于JavaScript实现留言板功能

2020-03-17 12:04 513 查看

本文实例为大家分享了JavaScript实现留言板功能的具体代码，供大家参考，具体内容如下

html代码

<div id="main" class="main">
<ul id="content" class="content">
<li class="msgContent left">hello?</li>
<div style="clear: both;"></div>
<li class="msgContent left">hello</li>
<div style="clear: both;"></div>
<li class="msgContent right">hi</li>
<div style="clear: both;"></div>
<li class="msgContent left">hehe</li>
<div style="clear: both;"></div>
<li class="msgContent left">goodbye</li>
<div style="clear: both;"></div>
<li class="msgContent right">。。。。</li>
<div style="clear: both;"></div>
<li class="msgContent right">I LOVE YOU</li>
</ul>
<textarea id="msg_input" class="msgInput"></textarea>
<button id="sendbtn" class="sendbtn">发送</button>
</div>

css代码

* {
font-size: 14px;
padding: 0;
margin: 0;
}

.main {
position: relative;
margin: 20px auto;
border: 1px solid steelblue;
width: 430px;
height: 400px;
}

.msgInput {
display: block;
width: 406px;
height: 60px;
margin: 10px auto;
}

.sendbtn {
position: absolute;
width: 100px;
height: 29px;
bottom: 5px;
right: 10px;
}

.content {
list-style: none;
width: 410px;
height: 280px;
margin: 5px auto;
border: 1px dotted #D1D3D6;
overflow-y: scroll;
}

.msgContent {
width: auto;
max-width: 250px;
height: auto;
word-break: break-all;
margin: 5px;
padding: 3px;
border-radius: 5px;
}

.content .left {
float: left;
text-align: left;
background-color: lightgrey;
}

.content .right {
float: right;
text-align: right;
background-color: yellowgreen;
}

.clear {
clear: both;
}

JS代码

var oBtn = document.getElementById("sendbtn");
var msg = document.getElementById("msg_input");
var oCon = document.getElementById("content");
oBtn.onclick = function () {
var msgVal = msg.value;
var li = document.createElement("li");
li.innerHTML = msgVal;
li.className = "msgContent right";
var div = document.createElement("div");
div.className = "clear";
oCon.appendChild(div);
oCon.appendChild(li);
msg.value = "";
//可见范围看见当前元素
li.scrollIntoView()
};

document.onkeypress = function (e) {
var e = e || event;
var code = e.keyCode || e.which;
if (code == 10) {
var msgVal = msg.value;
var li = document.createElement("li");
li.innerHTML = msgVal;
li.className = "msgContent right";
var div = document.createElement("div");
div.className = "clear";
oCon.appendChild(div);
oCon.appendChild(li);
msg.value = "";
//可见范围看见当前元素
li.scrollIntoView();
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助

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标签： js 留言板

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