小编给大家分享一下js如何实现简易聊天对话框，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
1、能够嵌入动态文本于HTML页面。2、对浏览器事件做出响应。3、读写HTML元素。4、在数据被提交到服务器之前验证数据。5、检测访客的浏览器信息。6、控制cookies，包括创建和修改等。7、基于Node.js技术进行服务器端编程。
具体内容如下
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>聊天对话框</title>
<style type="text/css">
*{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;
}
</style>
<script type="text/javascript">
window.onload=function(){
var input = document.getElementById('msg_input');//查找缓存
document.getElementById('sendbtn').onclick=function () {
//var input1 = document.getElementById('msg_input');//
//input0
sendMsg();
}
//快捷键 发送
document.onkeypress = function (event) {
var e = event || window.event;
var keycode = e.keyCode || e.which;
console.log(e)
if( keycode==10){//判断同时按下ctrl 和enter
sendMsg()
}
}
function sendMsg() {
var input = document.getElementById('msg_input');//查找缓存
var ul = document.getElementById('content');
var newLi = document.createElement('li');
newLi.innerHTML = input.value;
newLi.className = 'msgContent right';
ul.appendChild(newLi);
var div = document.createElement('div');
div.style = 'clear:both';
ul.appendChild(div);
ajax({
url:'http://jisuznwd.market.alicloudapi.com/iqa/query?question='+input.value,
success:function (res) {
// console.log(res)
var obj = JSON.parse(res);
console.log(obj)
var array = obj.result.content;
// var zhengzhou = array[0];
var tmp = array;
// var tmp = '温度:'+zhengzhou.day_air_temperature+','+zhengzhou.day_weather;
console.log(tmp)
var newLi = document.createElement('li');
newLi.innerHTML = tmp;
newLi.className = 'msgContent left';
ul.appendChild(newLi);
var div = document.createElement('div');
div.style = 'clear:both';
ul.appendChild(div);
input.value = '';
newLi.scrollIntoView();//将元素滚动到可见位置
}
})
input.value = '';
newLi.scrollIntoView();//将元素滚动到可见位置
}
}
function ajax(obj) {
//?lastCursor=6610&pageSize=10
// var url = 'reg.php';
var xhr = null;
if(window.ActiveXObject){
xhr = new ActiveXObject('Microsoft.XMLHTTP')
}else{
xhr = new XMLHttpRequest();
}
// $username = $_REQUEST['username'];
// $password = $_REQUEST['password'];
//打开与服务器的连接
if(obj.method){
xhr.open(obj.method,obj.url,true);
}else{
xhr.open('get',obj.url,true);
}
xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xhr.setRequestHeader("Authorization","APPCODE 3e9dfb924f464e9593a95f9d2bbf4348")
// {username:'zhangsa',password:123123}
// sendData = encodeURIComponent(sendData);
// 发送请求
//console.log(res);
//回调函数
xhr.onreadystatechange = function () {
// console.log(xhr.readyState)
if(xhr.readyState == 4){
//数据接收完毕
if(xhr.status == 200){
// console.log('请求成功',xhr.responseText)
if(obj.success){
obj.success(xhr.responseText)
}
}else{
// console.log(xhr.status,'请求出错')
if(obj.failure){
obj.failure('请求失败')
}
}
}
}
// var sendData = 'username=zhangsan&password=123456';
if( obj.method == undefined ||obj.method.toLowerCase() =='get'){
xhr.send(null);//
}else{
xhr.send(obj.params);//
}
}
</script>
</head>
<body>
<div id="main" class="main">
<ul id="content" class="content">
<li class="msgContent left">hello?</li>
<div ></div>
<li class="msgContent left">hello</li>
<div ></div>
<li class="msgContent right">hi</li>
<div ></div>
<li class="msgContent left">hehe</li>
<div ></div>
<li class="msgContent left">goodbye</li>
<div ></div>
<li class="msgContent right">。。。。</li>
<div ></div>
<li class="msgContent right">sdfasdsadfd fasd fasd fasdfasdfasdf</li>
<div ></div>
<li class="msgContent right"> 哈哈</li>
<div ></div>
</ul>
<textarea id="msg_input" class="msgInput"></textarea>
<button id="sendbtn" class="sendbtn">发送</button>
</div>
</body>
</html>看完了这篇文章，相信你对“js如何实现简易聊天对话框”有了一定的了解，如果想了解更多相关知识，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
