控制textarea文本长度,并限制输入字数(带统计显示)的特效(一)
控制textarea文本长度,并限制输入字数(带统计显示)的特效特效代码如下(提示用alert的):
<!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=utf-8" /><title>statInput 输入限制统计</title><style type="text/css"><!--* {padding: 0;margin: 0}body {margin: 3em;font: 12px Tahoma;background: #EAEAEA;color: #333333;line-height: 20px}input,textarea {font: 12px Tahoma;color: #666666;padding: 2px;border: solid 1px #DBDBDB}textarea {padding: 5px;line-height: 20px}p {margin: 1em 0}ul {}li {height: 1%;overflow: hidden;list-style-type: none}a {color: #666666;text-decoration: none}a:hover {color: #333333}.r {float: right}.l {float: left}.b {font-weight: bold}.gray {color: #666666;margin-top: 8px}.light {color: #FF6600;margin: 0 5px}.case {display: block;padding: 0 2em 2em 2em;border: solid 1px #EAEAEA;background: #FFFFFF;margin-bottom: 2em;height: 1%;overflow: hidden}.title {display: block;padding: .5em 2em .5em 1em;margin: 0 -2em 2em -2em;font-weight: bold;color: #000000;background: #FAFAFA;border-bottom: solid 1px #EAEAEA}.call {display: block;}.key {display: block;width: 6em;float: left}.type {display: block;width: 6em;float: left}.info {padding-left: 2em}.demo {margin-bottom: 2em}--></style><script language="javascript" type="text/javascript"><!--// 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);} }};--></script><script language="javascript" type="text/javascript"><!--/*====================================================== - 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==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("悟空你也太调皮了，为师跟你说过，叫你不要输那么多字~~."); // 解决FF老是跑回顶部 if(_brower.isFirefox) e.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();}--></script><script language="javascript" type="text/javascript"><!--/*********************************************- statInput 演示函数*********************************************/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?调用方法</div><div class="b">statInput(Element, MaxLen, {objMax, objTotal, objLeft, Hint});</div><ul class="info gray"><li><span class="key">Element：</span><span class="type">Object</span>限制统计对象?(*必须)</li><li><span class="key">MaxLen：</span><span class="type">Number</span>最大可输入长度?(*必须)</li><li><span class="key">objMax：</span><span class="type">Object</span>显示最大输入长度对象?(*可选)</li><li><span class="key">objTotal：</span><span class="type">Object</span>显示输入统计对象?(*可选)</li><li><span class="key">objLeft：</span><span class="type">Object</span>显示可输入长度对象?(*可选)</li><li><span class="key">Hint：</span><span class="type">Boolean</span>当长度超出上限时，是否提示?(*可选)</li></ul></div><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%">悟空你也太调皮了，我跟你说过，叫你不要乱扔东西， 乱扔东西这么做…… （咣当，悟空棍子掉在地上） 你看我还没有说完呢你把棍子又给扔掉了！月光宝盒是宝物，你把他扔掉会污染环境，唉，要是砸到小朋友那怎么办？就算没有砸到小朋友砸到那些花花草草也是不对的呀！</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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