支持多浏览器的textarea文本框输入字数判断js
javascript文件：(limitWord.js)// 这里都是公用函数，挺多的...
var
// 获取元素
$ = function(element) {
return (typeof(element) == 'object' ? element : document.getElementById(element));
},
// 判断浏览器
brower = function() {
var ua = navigator.userAgent.toLowerCase();
var os = new Object();
os.isFirefox = ua.indexOf ('gecko') != -1;
os.isOpera = ua.indexOf ('opera') != -1;
os.isIE = !os.isOpera&&ua.indexOf ('msie') != -1;
os.isIE7 = os.isIE&&ua.indexOf ('7.0') != -1;
return os;
},
// 事件操作(可保留原有事件)
eventListeners = [],
findEventListener = function(node, event, handler){
var i;
for (i in eventListeners){
if (eventListeners.node == node&&eventListeners.event == event&&eventListeners.handler == handler){
return i;
}
}
return null;
},
myAddEventListener = function(node, event, handler){
if (findEventListener(node, event, handler) != null){
return;
}
if (!node.addEventListener){
node.attachEvent('on' + event, handler);
}else{
node.addEventListener(event, handler, false);
}
eventListeners.push({node: node, event: event, handler: handler});
},
removeEventListenerIndex = function(index){
var eventListener = eventListeners;
delete eventListeners;
if (!eventListener.node.removeEventListener){
eventListener.node.detachEvent('on' + eventListener.event,eventListener.handler);
}else{
eventListener.node.removeEventListener(eventListener.event,eventListener.handler, false);
}
},
myRemoveEventListener = function(node, event, handler){
var index = findEventListener(node, event, handler);
if (index == null) return;
removeEventListenerIndex(index);
},
cleanupEventListeners = function(){
var i;
for (i = eventListeners.length; i > 0; i--){
if (eventListeners != undefined){
removeEventListenerIndex(i);
}
}
};
/*======================================================
- statInput 输入限制统计
- By Mudoo 2008.5
- 长度超出_max的话就截取...貌似没有更好的办法了
======================================================*/
function statInput(e, _max, _exp) {
e = $(e);
_max= parseInt(_max);
_max= isNaN(_max) ? 0 : _max;
_exp_exp= _exp==undefined ? {} : _exp;
if(e==null || _max==0) {
alert('statInput初始化失败！');
return;
}
var
// 浏览器
_brower= brower();
// 输出对象
_objMax= _exp._max==undefined ? null : $(_exp._max),
_objTotal = _exp._total==undefined ? null : $(_exp._total),
_objLeft = _exp._left==undefined ? null : $(_exp._left),
// 弹出提示
_hint= _exp._hint==undefined ? null : _exp._hint;
// 初始统计
if(_objMax!=null) _objMax.innerHTML = _max;
if(_objTotal!=null) _objTotal.innerHTML = 0;
if(_objLeft!=null) _objLeft.innerHTML = 0;
// 设置监听事件
// 输入这个方法比较好.
// 但是Opera下中文输入跟粘贴不能正确统计...相当BT的东西...
// 如果不考虑Opera的话就用这个吧.否则就老老实实用计时器.
if(_brower.isIE) {
myAddEventListener(e, "propertychange", stat);
}else{
myAddEventListener(e, "input", stat);
}
/*
// 用计时器的话就什么浏览器都支持了.
var _intDo = null;
myAddEventListener(e, "focus", setListen);
myAddEventListener(e, "blur", remListen);
function setListen() {
_intDo = setInterval(stat, 10);
}
function remListen() {
clearInterval(_intDo);
}
*/
// 统计函数
var _len, _olen, _lastRN, _sTop;
_olen = _len = 0;
function stat() {
_len = e.value.length;
if(_len==_olen) return;// 防止用计时器监听时做无谓的牺牲...
if(_len>_max) {
_sTop = e.scrollTop;
// 避免IE最后俩字符为'\r\n'.导致崩溃...
_lastRN = (e.value.substr(_max-1, 2) == "\r\n");
e.value = e.value.substr(0, (_lastRN ? _max-1 : _max));
if(_hint==true) alert("已超出输入字数.");
// 解决FF老是跑回顶部
if(_brower.isFirefox) ee.scrollTop = e.scrollHeight;
}
_olen = _len = e.value.length;
// 显示已输入字数
if(_objTotal!=null) _objTotal.innerHTML = _len;
// 显示剩余可输入字数
if(_objLeft!=null) _objLeft.innerHTML = (_max-_len)<0 ? 0 : (_max-_len);
}
stat();
}
测试页面：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns:mudoo>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>statInput</title>
<scripttype="text/javascript" src="limitWord.js"></script>
<script language="javascript" type="text/javascript">
<!--
myAddEventListener(window, "load", testStatInput);
function testStatInput(){
statInput('Test_1', 100, {_max : 'stat_max', _total : 'stat_total', _left : 'stat_left', _hint : true});
}
-->
</script>
</head>
<body>
<div class="case">
<div class="title">
<a href="" class="r">Top</a>statInput 演示
</div>
<textarea name="Test_1" id="Test_1" rows="10" style="width: 99%">请输入相关内容!</textarea>
<div class="gray">
最多可输入
<span id="stat_max" class="b light"></span>，当前共
<span id="stat_total" class="b light"></span>，还可输入
<span id="stat_left" class="b light"></span>
</div>
</div>
</body>
</html>
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