简易聊天对话框

最新推荐文章于 2025-07-08 14:06:39 发布

原创最新推荐文章于 2025-07-08 14:06:39 发布 · 2k 阅读

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文章标签：

#对话框 #聊天 #js

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本文介绍如何利用JavaScript创建一个基本的聊天对话框。内容包括对话框的布局设计、事件监听以及消息发送功能的实现，适合初级前端开发者学习。

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<!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">sdfasdsadfassdfsdfsdfdsfsdfsdfsdfdfasdffasdfasfdasd 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>