小弟对javascript不是特别了解,网上参考了一段代码,是显示评论的。页面加载时好像也自动加载评论,但如果数据库中没有评论数据,浏览器左下角提示找不到对象,但如果有评论就没有问题,哪位大哥帮小弟看看吧。<body onLoad="showre()">留言段代码/* 显示留言 */
function showre()
{ document.getElementById("list").innerHTML = "<div><img src=images/loading.gif />评论载入中...</div>";
var myurl=top.window.location.href;
var articleid=myurl.split('=');
var url = "show.asp?articleid="+articleid[1];
xmlHttp=GetXmlHttpObject(showlist)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
}
function showre()
{ document.getElementById("list").innerHTML = "<div><img src=images/loading.gif />评论载入中...</div>";
var myurl=top.window.location.href;
var articleid=myurl.split('=');
var url = "show.asp?articleid="+articleid[1];
xmlHttp=GetXmlHttpObject(showlist)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
}
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xmlHttp=GetXmlHttpObject(showlist)
// showlist哪来的
是这样的/* 显示留言 */
function showre()
{ document.getElementById("list").innerHTML = "<div><img src=images/loading.gif />评论载入中...</div>";
var myurl=top.window.location.href;
var articleid=myurl.split('=');
var url = "show.asp?articleid="+articleid[1];
xmlHttp=GetXmlHttpObject(showlist)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
}
function showlist()
{
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
document.getElementById("list").innerHTML = ""
xmlAuthor = xmlHttp.responseXML.getElementsByTagName("Author")
xmlContent = xmlHttp.responseXML.getElementsByTagName("Content")
for (i=0;i<xmlContent.length;i++)
{ var Content = xmlContent[i].firstChild.data;
var div = document.createElement("DIV");
div.id = i;
if (Content == " ") {
alert(1)
div.innerHTML = " "
}
else {
var Author = xmlAuthor[i].firstChild.data;
var PostTime = xmlAuthor[i].getAttribute('PostTime');
div.innerHTML = "<span class='purple'><b>"+Author+":</b> <br/><span class='cBlack'>"+Content+"</span>"
}
document.getElementById("list").appendChild(div);
}
}
}
var xmlHttp;
var addNew;
function GetXmlHttpObject(handler)
{
var objXmlHttp=null
if (navigator.userAgent.indexOf("MSIE")>=0)
{
var strName="Msxml2.XMLHTTP"
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP"
}
try
{
objXmlHttp=new ActiveXObject(strName)
objXmlHttp.onreadystatechange=handler
return objXmlHttp
}
catch(e)
{
alert("Error. Scripting for ActiveX might be disabled")
return
}
}
else
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler
return objXmlHttp
}
}
function md(){
eval("pl" + ".style.display=\"none\";")
}
/* 显示留言 */
function showre()
{ document.getElementById("list").innerHTML = "<div><img src=images/loading.gif />评论载入中...</div>";
var myurl=top.window.location.href;
var articleid=myurl.split('=');
var url = "show.asp?articleid="+articleid[1];
xmlHttp=GetXmlHttpObject(showlist)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
}
function showlist()
{
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
document.getElementById("list").innerHTML = ""
xmlAuthor = xmlHttp.responseXML.getElementsByTagName("Author")
xmlContent = xmlHttp.responseXML.getElementsByTagName("Content") for (i=0;i<xmlContent.length;i++)
{ var Content = xmlContent[i].firstChild.data;
var div = document.createElement("DIV");
div.id = i;
if (Content == " ") {
alert(1)
div.innerHTML = " "
}
else {
var Author = xmlAuthor[i].firstChild.data;
var PostTime = xmlAuthor[i].getAttribute('PostTime');
div.innerHTML = "<span class='purple'><b>"+Author+":</b> <br/><span class='cBlack'>"+Content+"</span>"
}
document.getElementById("list").appendChild(div);
} }
}
function ltrim(str)
{
var _str = " "+str;
var re = /[ ]+([\w|\W]*)/gi;
_str.match(re);
return RegExp.$1;
} function rtrim(str)
{
var _str = str+" ";
var re = /([\w|\W]*[^ ])[ ]+/gi;
_str.match(re);
return RegExp.$1;
}
/* 发送留言 */
function AddNew() {
document.getElementById("sendGuest").disabled = true;
/* var Author = rtrim(ltrim(escape(document.getElementById("memAuthor").value)));
var Content = rtrim(ltrim(escape(document.getElementById("memContent").value)));*/
var Author = escape(rtrim(ltrim(document.getElementById("memAuthor").value)));
var Content = escape(rtrim(ltrim(document.getElementById("memContent").value)));
var len=Author.length; if (len>50){
eval("pl" + ".style.display=\"block\";")
return false;
}
/* var lencon=Content.length;
if (lencon>500)
{
eval("pl" + ".style.display=\"block\";")
return false;
}*/
if (Author == "" || Content == "") {
eval("pl" + ".style.display=\"block\";")
document.getElementById("sendGuest").disabled = false;
return false;
}
addNew = GetXmlHttpObject(sendGuest);
var GuestInfo = "Author="+Author+"&Content="+Content;
var myurl=top.window.location.href;
var articleid=myurl.split('=');
addNew.open("POST","addnew.asp?articleid="+articleid[1],false);
addNew.setRequestHeader("Content-Type","application/x-www-form-urlencoded")
addNew.send(GuestInfo);
}
function sendGuest() {
if (addNew.readyState==4 || addNew.readyState=="complete") {
/* alert(addNew.responseText);*/
document.getElementById("sendGuest").disabled = false;
document.getElementById("memAuthor").value = "";
document.getElementById("memContent").value = "";
showre();
}
}
function reSet() {
document.getElementById("memAuthor").value = "";
document.getElementById("memContent").value = "";
}
function hide(){
if(window.event.keyCode==13)
window.event.keyCode=0;
return false;
}
var aMenu=1
onload=function init(){
var obj_li=document.getElementById("menu").getElementsByTagName("li"),j=obj_li.length;
for (var i=0;i<j;i++){
obj_li[i].index=i
obj_li[i].onmouseover=function(){menu(this,1)}
obj_li[i].onmouseout=function(){if(this.index==aMenu-1)menu(this,3);else menu(this,2)}
obj_li[i].onmousedown=function(){
for (var i=0;i<j;i++) menu(obj_li[i],2);
aMenu=this.index+1;
this.onmouseout=null;
menu(this,1)
init()
}
}
}
function menu(obj,state)
{
if(state==1){
obj.className="menuhover";}
if(state==2){
obj.className="menuli";}
if(state==3){
obj.className="menudown";}
}
</script>
with(xmlHttp){
if (readyState==4 && status==200){
if(!responseXML){alert("无数据");return;}
document.getElementById("list").innerHTML = ""
xmlAuthor = responseXML.getElementsByTagName("Author")
xmlContent =responseXML.getElementsByTagName("Content")
}
}
.......................
.......................
.......................
}