js实现简易聊天对话框

本文实例为大家分享了js实现简易聊天对话框的具体代码，供大家参考，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 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">sdfasdsadfd fasd fasd fasdfasdfasdf</li>
   <div style="clear:both"></div>
   <li class="msgContent right"> 哈哈</li>
   <div style="clear:both"></div>
  </ul>
  <textarea id="msg_input" class="msgInput"></textarea>
  <button id="sendbtn" class="sendbtn">发送</button>
 </div>
</body>
</html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。