怎么用AJAX实现简单的聊天室代码

本篇内容主要讲解“怎么用AJAX实现简单的聊天室代码”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么用AJAX实现简单的聊天室代码”吧!

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很早就想发出来了,一直以来都没什么时间,今天偷个空先把代码发上面,明天来写注释.

还是那句话,AJAX是一种应用,而不是一个专门的技术,我认为做做DEMO要的是速度,要让看的人好理解,而JS是最基本的WEB语言,相信比起其他的语言来说,要明了很多,所以我还是选择用JS写前后台代码.但并不代表我不会其他的语言,程序关键还是在于自我对实现的想法,而用什么语言,好比选择工具一样,我用菜刀可以做,用瑞士军刀也可以做,关键是要看在什么场合.

再就AJAX实际上首要考虑的是人性化,人机交互的便利才是他的优势,否则我还是劝你使用FLASH的AS来的更快.

记住这个词--认知潜意识.千万不要让用户感觉到操作的不适应,你也一定要想在用户的前面,也许这就是程序不智能的位置.
如果你喜欢的话可以继续开发这个东西,更希望你能够注明一下转载出处,我会觉得非常地高兴,并写出更多更好的东西.

首页HTML代码:请保存为index.html

CSS文件:请保存为 images/chatstyle.css

程序代码

body{
    margin: 0px;
    padding: 0px;
    font-size: 9pt;
    background-image: url(JD112.jpg);
    background-position: center center;
}
#outmain{
    height: 400px;
    font-size: 9pt;
    overflow-y: scroll;
    overflow-x: hidden;
    SCROLLBAR-ARROW-COLOR:#FF9900;
    SCROLLBAR-FACE-COLOR:#FFF9E1;
    SCROLLBAR-DARKSHADOW-COLOR:#FF9900;
    SCROLLBAR-HIGHLIGHT-COLOR:#FFFFFF;
    SCROLLBAR-3DLIGHT-COLOR:#FF9900;
    SCROLLBAR-SHADOW-COLOR:#FFFFFF;
    SCROLLBAR-TRACK-COLOR:#FFF9E1;
}
#chatmain{}
#outs{
    width: 540px;
    margin-right: auto;
    margin-left: auto;
    padding: 10px;
    margin-top: 10px;
    margin-bottom: 10px;
    background-color: #FFF9E1;
    border: 1px solid #AAA;
    clear: both;
}
.in{
    text-align: center;
}

.names{
    border: 1px solid #AAA;
    background-color: #FFF9E1;
    width: 80px;
    height: 19px;
    line-height: 19px;
}
#loadifo {
    position:absolute;
    top:100px;
    z-index:1;
    right: 10px;
    line-height: 21px;
}
.header{
    height: 60px;
    background-color: #000;
    text-align: center;
    color: #FFF;
    font-weight: bold;
    line-height: 60px;
    font-family: Tahoma;
    font-size: 12pt;
    float: left;
    width: 100%;
    margin-bottom: 20px;
    filter: Alpha(Opacity=50);
    opacity: 0.5;
}
/*效果*/
.btn{
    border: 1px solid #AAA;
    position: absolute;
    margin-top: 2px;
}
.inputs{
    font-size: 9pt;
    background-image: url(input.png);
    background-repeat: no-repeat;
    width: 295px;
    line-height: 21px;
    height: 21px;
    margin: 0px;
    padding: 0px;
    border: 1px solid #AAA;
}
.left,.right{
    background-repeat: no-repeat;
    background-position: center center;
    cursor:pointer;
    border-top-style: none;
    border-right-style: none;
    border-bottom-style: none;
    border-left-style: none;
    background-color: #FFF;
    height: 23px;
    width: 23px;
}
.left{
    background-image: url(l1.gif);
}
.right{
    background-image: url(r1.gif);
}

JS主文件: 请保存为 images/chat.js

程序代码

var nowNum = "m"
function getId(objId){
    return document.getElementById(objId)
}
function getName(objName){
    return document.getElementsByName(objName)[0]
}
var xmldoc
function createxmldoc(){
    if(window.XMLHttpRequest){
        xmldoc = new XMLHttpRequest();
        if(xmldoc.overrideMimeType){
                xmldoc.overrideMimeType("text/xml");
        }
    }else if(window.ActiveXObject){
        try{
            xmldoc = new ActiveXObject("Msxml4.XMLHTTP");
        }catch(e){
            try{
                xmldoc = new ActiveXObject("Msxml3.XMLHTTP");
            }catch(e){
                try{
                    xmldoc = new ActiveXObject("Msxml2.XMLHTTP");
                }catch(e){
                    try{
                        xmldoc = new ActiveXObject("Microsoft.XMLHTTP");
                    }catch(e){}
                }
            }
        }
    }
    if(!xmldoc){
        return false;
    }
}
function createQueryString(names){
    var conts = getName(names).value
    if(conts != ""){
        if(conts == "clear"){
            getId("chatmain").innerHTML = ""
            clean()
            focs()
            return false
        }else{
            return conts
        }
    }else{
        return false
    }
}
function doUsingGet(){
    xmldoc = false
    createxmldoc()
    var url = "chat.asp?clien="+nowNum+"&timeStamp="+new Date().getTime();
    xmldoc.open("GET",url,true);
    xmldoc.onreadystatechange = CheckState;
    xmldoc.setRequestHeader("Content-Type","text/xml;charset=GB2312;");
    xmldoc.send(null);
}
function doUsingPost(){
    createxmldoc()
    if(createQueryString("inputs")){
        if(createQueryString("named")){
            var named = "&named="+createQueryString("named")
        }else{
            var named = ""    
        }
        if(createQueryString("inputs") == "cls"){
            nowNum = "m"
        }
        var url = "chat.asp?clien="+nowNum+"&cont="+createQueryString("inputs")+named+"&timeStamp="+new Date().getTime();
        xmldoc.open("GET",url,true);
        xmldoc.onreadystatechange = CheckState;
        xmldoc.setRequestHeader("Content-Type","text/xml;charset=GB2312;");
        xmldoc.send(null);
        getId("errors").innerHTML = ""
        addChat(createQueryString("inputs"));
        clean()
        focs()
    }else{
        getId("loadifo").innerHTML = "请输入对话内容！"    
        focs()
    }
}
function CheckState(){
    if(xmldoc.readyState == 1){
        //getId("loadifo").innerHTML = "连接服务器"
        }
    else if(xmldoc.readyState == 2){
        //getId("loadifo").innerHTML = "开始加载数据"
        }
    else if(xmldoc.readyState == 3){
        //getId("loadifo").innerHTML = "正在加载数据"
        }
    else if(xmldoc.readyState == 4){
        if(xmldoc.status == 200){
            results()
        }
        else{
            getId("loadifo").innerHTML = "错误"+xmldoc.status;
            focs()
        }
    }
}
function results(){
    resXml()
}
function resXml(){
    var res = xmldoc.responseXML.documentElement;
    var resLen = res.getElementsByTagName("items").length
    if(getTag(res,0,"num") != nowNum){
        //alert(xmldoc.responseXML.xml)
        nowNum = getTag(res,0,"num")
        for(var i=0; i            var useName = getTag(res,i,"name")
            var useMag = getTag(res,i,"conts")
            var useIp = getTag(res,i,"ip")
            if(nowNum != "0" && useMag != ""){
                if(useName != ""){
                    var lis = "用户"+ useName + "说：" + useMag + " ["+ useIp + "]"
                }else{
                    var lis = "用户 ["+ useIp + "] 说：" + useMag
                }
            }else{
                var lis = "用户 ["+ useIp + "] 进入聊天室！"
            }
            //var newp = document.createElement("p")
            //newp.innerHTML = lis
            //getId("chatmain").appendChild(newp)
            getId("chatmain").innerHTML += lis + "
"
        }
        innerSize()
    }
}
function getTag(response,i,objTagName){
    try{
        var nodeV = response.getElementsByTagName(objTagName)[i].firstChild.nodeValue;
    }catch(e){
        var nodeV = ""
    }
    return nodeV;
}
var overs
function innerSize(){
    if(overs != 1){
        if(getId("chatmain").offsetHeight < getId("outmain").offsetHeight){
            getId("chatmain").style.marginTop = getId("outmain").offsetHeight - getId("chatmain").offsetHeight +"px";
        }else{
            getId("chatmain").scrollIntoView(false)    
        }
    }
}
window.onload = function(){
    getId("outs").onmousedown = function(){
        overs = 1
    }
    getId("outs").onmouseout = function(){
        overs = 0
        focs()
    }
    getName("inputs").onkeydown = function(e){
        if(document.all){
            var Keys = event.keyCode;    
        }else{
            var Keys = e.which;
        }
        //alert(Keys)
        if(Keys == "38"){
            preChat()
        }else if(Keys == "40"){
            nextChat()
        }else if(event.ctrlKey && Keys == "13"){
            doUsingPost()
        }else if(event.ctrlKey && Keys == "46"){
            clean()
        }
    }

}
setInterval("doUsingGet()",1000)

JS辅助文件:请保存为 images/display.js

程序代码

function overInput(a){
    getId("btn").style.border = "1px solid #54ce43"
    getId("inputs").style.border = "1px solid #54ce43"
    focs()
}
function outInput(a){
    getId("btn").style.border = "1px solid #AAA"
    getId("inputs").style.border = "1px solid #AAA"
    focs()
}
function overBtn(a){
    a.src = "images/hover.gif"
}
function outBtn(a){
    a.src = "images/rest.gif"
}
function lrover(a){
    a.style.backgroundColor = "#EEE"
}
function lrout(a){
    a.style.backgroundColor = "#FFF"    
}
function focs(){
    getName("inputs").focus();
}
function clean(){
    getName("inputs").value = ""
}
var chats = new Array()
var chatStart
function addChat(strChat){
    if(chats.length > 199){
        chats.shift()
    }
    chats.push(strChat)
    chatStart = chats.length
}
function preChat(){
    if(chatStart && chatStart >= 1){
        if(chatStart == 1){
            getName("inputs").value = chats[0]
            chatStart = 0.5
        }else{
            chatStart -= 1
            getName("inputs").value = chats[chatStart]
        }
    }
    getId("loadifo").innerHTML = chatStart+","+chats.length
}
function nextChat(){
    if(chatStart && chatStart < chats.length && chats.length > 1){
        if(chatStart == 0.5){
            chatStart = 1
        }else if(chatStart == chats.length - 1){
            chatStart = chats.length - 1
        }else{
            chatStart += 1
        }
        getName("inputs").value = chats[chatStart]
    }
    getId("loadifo").innerHTML = chatStart+","+chats.length
}

主ASP程序文件:请保存为chat.asp

<%@LANGUAGE="JAVASCRIPT" CODEPAGE="936"%><%
    Session.CodePage = 936
    Response.ContentType = "application/xml"
    Response.Expires = 0
%><%
function repla(str){
    str = str.replace(/\&/g, "&");
    str = str.replace(/\>/g, ">");
    str = str.replace(/\    str = str.replace(/\"/g, """);
    str = str.replace(/\'/g, "'");
    return str;
}

var useIp = Request.ServerVariables("REMOTE_ADDR")
if(!Application("counts")){
    Application("counts") = 0
}
if(Request("cont").Count != 0){
    Application.Lock()
        if(Application("counts") < 21){        
            Application("counts") += 1
        }else if(Application("counts") >= 21){
            Application("counts") = 1
        }
        var Cnum = Application("counts")
        var Msgs = repla(Server.HTMLEncode(Request("cont")))
        Application("ips" + Cnum) = useIp +""
        Application("msgs" + Cnum) = Msgs +""
        if(Request("named").Count != 0){
            var names = Request("named")
        }else{
            var names = ""
        }
        Application("names" + Cnum) = names +""
    Application.UnLock()
}
if(Request("cont") == "cls"){
    Application.Contents.RemoveAll()
}
%>

    <%=Application("counts")%>
    <%
    if(Request("clien") == "m"){
    %>
    
        <%=useIp%>
    
    <%
    }else if(Request("clien") < Application("counts")){
        for(var i=Request("clien"); i            s = Number(i)+1
            var useName = Application("names" + s)
            var useMsg = Application("msgs" + s)
            var useIp = Application("ips" + s)
    %>
    
        <%=Request("clien")%> <%=s%>
        <%=Application("counts")%>
        <%=useName%>
        <%=useMsg%>
        <%=useIp%>
    
    <%
        }
    }else if(Request("clien") > Application("counts")){
        for(var i=Request("clien"); i<21; i++){
            var useName = Application("names" + i)
            var useMsg = Application("msgs" + i)
            var useIp = Application("ips" + i)
    %>
    
        <%=useName%>
        <%=useMsg%>
        <%=useIp%>
    
    <%
        }
        for(var m=1; m<=Application("counts"); m++){
            var useNameM = Application("names" + m)
            var useMsgM = Application("msgs" + m)
            var useIpM = Application("ips" + m)
    %>
    
        <%=useNameM%>
        <%=useMsgM%>
        <%=useIpM%>
    
    <%
        }
    }else if(Request("clien") == Application("counts")){

    }
    %>

全部程序打包下载: 点击下载

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