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js计数发布.html
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js计数发布.html
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>js类似微博发布框demo</title>
<style type="text/css">
body{
margin:0;
padding:0;
border:0;
}
#wrapper{
width:620px;
height:160px;
padding:15px;
margin:0 auto;
position:relative;
border:2px #261d3b solid;
border-radius: 2px;
background-color: #261d3b;
}
#share{
display:block;
padding:5px;
color:#b377e3;
}
#num{
display:block;
position:absolute;
right:36px;
top:18px;
padding:5px;
color:#b377e3;
}
textarea{
display:block;
width:600px;
height:100px;
outline: none;
overflow:auto;/* 去掉ie下textarea的默认滚动条 */
border-width: 1px;
background-color: #5b577c;
}
.dis,.able{
display:block;
float:right;
margin-right: 16px;
margin-top: 5px;
width:76px;
height:32px;
background-color: #ffc09f;
color:#fff;
border:2px #ffc09f solid;
border-radius: 4px;
cursor: pointer;
}
.dis{
background-color: #ffc09f;
border:2px #ffc09f solid;
}
.able{
background-color: #f77c3d;
border:2px #f77c3d solid;
}
</style>
</head>
<body>
<div id="wrapper">
<span id="share">分享新鲜事儿</span>
<span id="num"><span id="count">0</span>/150</span>
<textarea placeholder="请输入你的分享150字以内"></textarea>
<button class="dis">发布</button>
</div>
<script type="text/javascript">
window.onload = function(){
var she = new share();
she.getFocus();
she.getBlur();
she.getPost();
she.Post();
}
function share(){
this.count = document.getElementById('count');
this.txt = document.getElementsByTagName('textarea')[0];
this.btn = document.getElementsByTagName('button')[0];
}
share.prototype = {
/*textarea获得焦点*/
getFocus : function(){
var that = this;
this.txt.onfocus = function(){
this.style.borderColor = '#f77c3d' ;
}
},
/*textarea失去焦点*/
getBlur : function(){
this.txt.onblur = function(){
this.style.borderColor = '#5b577c';
}
},
/*兼容ie输入改变事件*/
getPost : function(){
var ie = !-[1,];
var that = this;
if(ie){
this.txt.onpropertychange = function(){
that.getInputlen();
}
}else{
this.txt.oninput = function(){
that.getInputlen();
}
}
},
/*计数输入长度*/
getInputlen : function(){
var len = this.txt.value.length;
this.count.innerHTML = len;
if(len>=1&&len<150){
this.btn.className = 'able';
}else if(len == 0){
this.btn.className = 'dis';
}else if(len >= 150){
this.btn.className = 'dis';
this.count.innerHTML = '已超出'+(len-150)+'个字';
}
},
/*发布控制*/
Post : function(){
var timer = '';
var num = 0;
var that = this;
this.btn.onclick = function(){
if(that.btn.className =='dis'){
clearInterval(timer);
timer = setInterval(function(){
if(num == 5){
clearInterval(timer);
num = 0;
}else
num++;
if(num%2){
that.txt.style.backgroundColor = '#ffc09f';
}else{
that.txt.style.backgroundColor = '';
}
},200);
}else{
alert('发布成功！');
that.txt.value = '';
}
}
}
}
</script>
</body>
</html>