【每日一学】分享一个评论功能。
功能主要实现：点赞 取消赞 评论 删除 回复 字数统计
利用事件代理。
oDiv.onclick=function(e){
e=e||window.event;
var el=e.srcElement||e.target
if(el.className=='del'){
}或者
switch(el.className){
case 'del':
执行；
break;
}
}看下代码：
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
<style type="text/css">
body { font-size: 12px; line-height: 120%; text-align: center; color:#333; padding: 20px;}
a { color: #333; text-decoration: none;}
a:hover { text-decoration: underline;}
* { margin: 0; padding: 0; border: none;}
.clearfix:after { content:"."; display:block; height:0; clear:both; visibility:hidden}
.clearfix { *height:1%;}
#list { margin: 0 auto; text-align: left; width: 540px;}
.box { border-top: 1px solid #eee; position: relative; width: 540px; padding: 20px 0}
.box:hover .close { display: block;}
.close { display: none; top:0px; right: 0px; width: 28px; height: 28px; border: 1px solid #eee; position: absolute; background: #f2f4f7; line-height: 27px; text-align: center;}
.close:hover { background: #c8d2e2; text-decoration: none;}
.head { float: left; width: 60px; height: 60px; margin-right: 10px;}
.content { float: left; width: 440px;}
.main { margin-bottom: 10px;}
.txt { margin-bottom: 10px;}
.user { color: #369; }
.pic { margin-right: 5px; width: 200px; border: 1px solid #eee;}
.info { height: 20px; line-height: 19px; font-size: 12px; margin: 0 0 10px 0;}
.info .time { color: #ccc; float: left; height: 20px; padding-left: 20px; background: url("http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=4d6786221f265857f127655175b84728") no-repeat left top;background-size:16px 16px}
.info .praise { color: #369; float: right; height: 20px; padding-left: 18px; background: url("http://cdn.attach.qdfuns.com/notes/pics/201612/16/213536ntyz1os1mcrllygs.jpg.editor.jpg") no-repeat left top;background-size:16px 16px}
.info .praise:hover { text-decoration: underline; background: url("http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=c3e3b865e2830bb178a58d6404037a6a") no-repeat left top;background-size:16px 16px}
.praises-total { margin: 0 0 10px 0; height: 20px; background: url("http://cdn.attach.qdfuns.com/notes/pics/201612/16/213536ntyz1os1mcrllygs.jpg.editor.jpg") no-repeat 5px 5px rgb(247, 247, 247); padding: 5px 0 5px 25px; line-height: 19px;background-size:16px 16px}
.comment-box { padding: 10px 0; border-top: 1px solid #eee;}
.comment-box:hover { background: rgb(247, 247, 247);}
.comment-box .myhead { float: left; width: 30px; height: 30px; margin-right: 10px;}
.comment-box .comment-content { float: left; width: 400px; }
.comment-box .comment-content .comment-time { color: #ccc; margin-top: 3px; line-height: 16px; position: relative;}
.comment-box .comment-content .comment-praise { display: none; color: #369; padding-left: 17px; height: 20px; background: url("http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=671df721b51bf652185d4b730e514c8d") no-repeat; position: absolute; bottom: 0px; right: 44px;background-size:16px 16px}
.comment-box .comment-content .comment-operate { display: none; color: #369; height: 20px; position: absolute; bottom: 0px; right: 10px;}
.comment-box .comment-content:hover .comment-praise { display: inline-block;}
.comment-box .comment-content:hover .comment-operate { display: inline-block;}
.text-box .comment { border: 1px solid #eee; display: block; height: 15px; width: 428px; padding: 5px; resize: none; color: #ccc}
.text-box .btn { font-size: 12px; font-weight: bold; display: none; float: right; width: 65px; height: 25px; border: 1px solid #0C528D; color: #fff; background: #4679AC;}
.text-box .btn-off { border: 1px solid #ccc; color: #ccc; background: #F7F7F7;}
.text-box .word{ display: none; float: right; margin: 7px 10px 0 0; color: #666;}
.text-box-on .comment{ height: 50px; color: #333;}
.text-box-on .btn{ display: inline;}
.text-box-on .word{ display: inline;}
</style>
</head>
<body>
<div id="list">
<div class="box clearfix">
<a class="close" href="javascript:;">×</a>
<img class="head" src="http://cdn.attach.qdfuns.com/notes/pics/201612/16/213524t29ipa2p26p2ij9a.jpg.editor.jpg" alt=""/>
<div class="content">
<div class="main">
<p class="txt">
<span class="user">Andy：</span>轻轻的我走了，正如我轻轻的来；我轻轻的招手，作别西天的云彩。
</p>
<img class="pic" src="http://cdn.attach.qdfuns.com/notes/pics/201612/16/213444wrzo2jgjk26sjmj6.jpg.editor.jpg" alt=""/>
</div>
<div class="info clearfix">
<span class="time">02-14 23:01</span>
<a class="praise" href="javascript:;">赞</a>
</div>
<div class="praises-total" total="4" style="display: block;">4个人觉得很赞</div>
<div class="comment-list">
<div class="comment-box clearfix" user="self">
<img class="myhead" src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=8de7f473592034ece3bfe53deec17617" alt=""/>
<div class="comment-content">
<p class="comment-text"><span class="user">我：</span>写的太好了。</p>
<p class="comment-time">
2014-02-19 14:36
<a href="javascript:;" class="comment-praise" total="1" my="0" style="display: inline-block">1 赞</a>
<a href="javascript:;" class="comment-operate">删除</a>
</p>
</div>
</div>
</div>
<div class="text-box">
<textarea class="comment" autocomplete="off" maxlength="140">评论…</textarea>
<button class="btn ">回 复</button>
<span class="word"><span class="length">0</span>/140</span>
</div>
</div>
</div>
<div class="box clearfix">
<a class="close" href="javascript:;">×</a>
<img class="head" src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=1916cdf7514bf2d2fd50f3f9ee3e5794" alt=""/>
<div class="content">
<div class="main">
<p class="txt">
<span class="user">人在旅途：</span>三亚的海滩很漂亮。
</p>
<img class="pic" src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=460a2f672b4a5bee8d3cf732f7779a18" alt=""/>
</div>
<div class="info clearfix">
<span class="time">02-14 23:01</span>
<a class="praise" href="javascript:;">赞</a>
</div>
<div class="praises-total" total="0" style="display: none;"></div>
<div class="comment-list">
<div class="comment-box clearfix" user="other">
<img class="myhead" src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=460a2f672b4a5bee8d3cf732f7779a18" alt=""/>
<div class="comment-content">
<p class="comment-text"><span class="user">老鹰：</span>我也想去三亚。</p>
<p class="comment-time">
2014-02-19 14:36
<a href="javascript:;" class="comment-praise" total="0" my="0">赞</a>
<a href="javascript:;" class="comment-operate">回复</a>
</p>
</div>
</div>
</div>
<div class="text-box">
<textarea class="comment" autocomplete="off" maxlength="140">评论…</textarea>
<button class="btn ">回 复</button>
<span class="word"><span class="length">0</span>/140</span>
</div>
</div>
</div>
<div class="box clearfix">
<a class="close" href="javascript:;">×</a>
<img class="head" src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=e782df0c58bab4b389f3c045ff7cc5ef" alt=""/>
<div class="content">
<div class="main">
<p class="txt">
<span class="user">小Y：</span>英国艺术家 Jane Perkins 能利用很多不起眼的东西进行创作，甚至是垃圾。首饰、纽扣、玩具等等都可以作为他创作的工具并创作出惟妙惟肖的画作，丝毫不逊色于色彩丰富的颜料。
</p>
</div>
<div class="info clearfix">
<span class="time">02-11 13:17</span>
<a class="praise" href="javascript:;">赞</a>
</div>
<div class="praises-total" total="0" style="display: none;"></div>
<div class="comment-list">
</div>
<div class="text-box">
<textarea class="comment" autocomplete="off" maxlength="140">评论…</textarea>
<button class="btn ">回 复</button>
<span class="word"><span class="length">0</span>/140</span>
</div>
</div>
</div>
</div>
<script type="text/javascript">
var list=document.getElementById('list')
var lis=list.children;
//删除节点
function removeNode(el){
el.parentNode.removeChild(el)
}
//点赞功能
function praiseBox(box, el){
var praiseElement=box.getElementsByClassName('praises-total')[0]
var oldTotal=parseInt(praiseElement.getAttribute('total'))
var newTotal;
if(el.innerHTML=='赞'){
newTotal=oldTotal+1
praiseElement.innerHTML=newTotal==1?'我觉得很赞':'我和'+oldTotal+'个人觉得很赞'
el.innerHTML='取消赞'
}else{
newTotal=oldTotal-1
praiseElement.innerHTML=newTotal==0?'':newTotal+'个人觉得很赞'
el.innerHTML='赞'
}
praiseElement.style.display=newTotal>0?'block':'none'
praiseElement.setAttribute('total',newTotal)
}
//发表评论
function replay(box){
var textarea=box.getElementsByTagName('textarea')[0]
var list=box.getElementsByClassName('comment-list')[0]
var div=document.createElement('div')
div.className='comment-box clearfix'
div.setAttribute('user','self')
var html='<img class="myhead" src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=8de7f473592034ece3bfe53deec17617" alt=""/>'+
'<div class="comment-content">'+
'<p class="comment-text"><span class="user">我：</span>'+textarea.value+'</p>'+
'<p class="comment-time">'+
getTime()+
'<a href="javascript:;" class="comment-praise" total="0" my="0">赞</a>'+
'<a href="javascript:;" class="comment-operate">删除</a>'+
'</p>'+
'</div>'
div.innerHTML=html
list.appendChild(div)
textarea.value=''
textarea.onblur()
}
function toTwo(a){
if(a<10){
return '0'+a;
}else{
return ''+a
}
}
function getTime(){
var time=new Date()
var year=time.getFullYear()
var month=time.getMonth()+1
var date=time.getDate()
var h=time.getHours()
var m=time.getMinutes()
var s=time.getSeconds()
return year+'-'+toTwo(month)+'-'+date+' '+toTwo(h)+':'+toTwo(m)
}
//赞回复
function praiseReplay(el){
var oldTotal=parseInt(el.getAttribute('total'))
var my=parseInt(el.getAttribute('my'))
var newTotal;
if(my==0){
newTotal=oldTotal+1;
el.innerHTML=newTotal+' 取消赞'
el.setAttribute('total',newTotal)
el.setAttribute('my',1)
}else{
newTotal=oldTotal-1;
el.innerHTML=newTotal==0?'赞':newTotal+' 赞'
el.setAttribute('total',newTotal)
el.setAttribute('my',0)
}
el.style.display=newTotal==0?'':'inline-block'
}
//操作回复
function operateReplay(el){
var commentBox=el.parentNode.parentNode.parentNode
var box=commentBox.parentNode.parentNode.parentNode
var textarea=box.getElementsByTagName('textarea')[0]
var user=commentBox.getElementsByClassName('user')[0]
var txt=el.innerHTML
if(txt=='回复'){
textarea.onfocus()
textarea.value='回复'+user.innerHTML
textarea.onkeyup=function(){
var len=this.value.length-user.innerHTML.length-2;
var p=this.parentNode;
var btn=p.children[1]
var word=p.children[2]
if(len==0){
btn.className='btn btn-off'
}else{
btn.className='btn'
}
word.innerHTML=len+'/140'
}
}else{
removeNode(commentBox)
}
}
for(var i=0;i<lis.length;i++){
lis[i].onclick=function(e){
var e=e||window.event
var el=e.srcElement||e.target
switch(el.className){
case 'close':
removeNode(el.parentNode);
break;
//赞分享
case 'praise':
praiseBox(el.parentNode.parentNode.parentNode,el);
break;
//发表评论
case 'btn':
replay(el.parentNode.parentNode.parentNode);
break;
//赞回复
case 'comment-praise':
praiseReplay(el);
break;
//操作回复
case 'comment-operate':
operateReplay(el);
break;
}
}
//评论功能
var textarea=lis[i].getElementsByTagName('textarea')[0]
textarea.onfocus=function(){
this.parentNode.className='text-box text-box-on'
this.value=this.value=='评论…'?'':this.value
this.onkeyup()
}
textarea.onblur=function(){
if(this.value==''){
this.parentNode.className='text-box'
this.value='评论…'
}
}
textarea.onkeyup=function(){
var len=this.value.length;
var p=this.parentNode;
var btn=p.children[1]
var word=p.children[2]
if(len==0){
btn.className='btn btn-off'
}else{
btn.className='btn'
}
word.innerHTML=len+'/140'
}
}
</script>
</body>
</html>大家贴到网页中试下吧。
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