JS验证文本框里的字数限制
需要用到的图片下载:
<!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>POPHint & statInput 整合效果</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} /* popHint Style */ #popHint {position: absolute; line-height: normal} #popHint .popLeft, #popHint .popRight, #popHint .popAngle span, #popHintText, #popHint .popIcon {background-image: url(images/PopHint.gif)} #popHint .popHeader {height: 1%; overflow: hidden !important; overflow /**/: visible} #popHint .popLeft {float: left; width: 5px; height: 24px; background-position: 0 0; background-repeat: no-repeat} #popHint .popRight {float: left; width: 5px; height: 24px; background-position: -10px -25px; background-repeat: no-repeat} #popHint .popAngle {clear: both; position: relative; height: 10px} #popHint .popAngle span {position: absolute; top: -3px; left: 15px; width: 7px; height: 13px; background-position: 0 -75px; background-repeat: no-repeat} #popHintText {float: left; color: #975400; height: 19px !important; height /**/: 24px; padding: 5px 0 0 0; white-space: nowrap; background-position: 0 -50px; background-repeat: repeat-x; overflow: hidden} #popHintText .popIcon {float: left; width: 15px; height: 10px; margin: 1px 3px 0 0} #popHint .wrong {background-position: 0 -90px; background-repeat: no-repeat} #popHint .right {background-position: 0 -105px; background-repeat: no-repeat} /* 这里可以自己扩展图标.(15*10) */ --> </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; }, // 生成元素到refNode appendElement = function(tagName, Attribute, strHtml, refNode) { var cEle = document.createElement(tagName); // 属性值 for (var i in Attribute){ cEle.setAttribute(i, Attribute[i]); } cEle.innerHTML = strHtml; refNode.appendChild(cEle); return cEle; }, // 获取元素坐标 getCoords = function(node){ var x = node.offsetLeft; var y = node.offsetTop; var parent = node.offsetParent; while (parent != null){ x += parent.offsetLeft; y += parent.offsetTop; parent = parent.offsetParent; } return {x: x, y: y}; }, // 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[i].node == node && eventListeners[i].event == event && eventListeners[i].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[index]; delete eventListeners[index]; 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[i] != 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) popHint(e, "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(); } /********************************************* - POPHint 弹出提示框 - By Mudoo 2008.5 **********************************************/ function popHint(obj, msg, initValues) { var _obj = $(obj), _objHint = $("popHint"), _msg = msg, _init = initValues; // 初始化失败... if(_obj==undefined || _msg==undefined || _msg=="") return; // 设置初始值 _init = _init==undefined ? {_type : "wrong", _event : "click"} : _init; // obj如果不可见。设置弹出对象为obj父元素 if(_obj.style.display=='none' || _obj.style.visibility=='hidden' || _obj.getAttribute('type')=='hidden') _obj = _obj.parentNode; var _type = null, _event = null, _place = getCoords(_obj), _marTop = null, _objText = $("popHintText"), // 初始化 init = function() { var _hint = _obj.getAttribute("hint"); if(_hint=="false") return; // 有的时候initValues不为空.但是只设置一个值...避免发生错误.再次设置初始值... _type = _init._type==undefined ? "wrong" : _init._type; _type = _type.toLowerCase(); _event = _init._event==undefined ? "click" : _init._event; _event = _event.toLowerCase(); /* ****************************************** popHtml ****************************************** <div id="popHint"> <div id="popHeader"> <div class="popLeft"></div> <div id="popHintText"><span class=\"popIcon wrong></span>请输入您的用户名!</div> <div class="popRight"></div> </div> <div class="popAngle"><span></span></div> </div> */ // 好了.输出... var _Html = "<div id=\"popHeader\">" + "<div class=\"popLeft\"></div>" + "<div id=\"popHintText\"></div>" + "<div class=\"popRight\"></div>" + "</div>"+ "<div class=\"popAngle\"><span></span></div>" if(_objHint==null) { _objHint = appendElement("div", {"id" : "popHint"}, _Html, document.body); _objHint.style.display = "none"; _objText = $("popHintText"); } show(); }, // 显示 show = function() { _objHint.style.display = ""; _marTop = _objHint.offsetHeight; _msg = "<span class=\"popIcon "+ _type +"\"></span>"+ _msg; _objText.innerHTML = _msg; _objHint.style.left = _place.x +"px"; _objHint.style.top = (_place.y-_marTop+8) +"px"; // 关闭触发事件 switch(_event) { case "blur" : myAddEventListener(_obj, 'blur', hide); break; //default : case "click" : myAddEventListener(document, 'mousedown', hide); break; //这里可以自己扩展很多事件... } }, // 关闭 hide = function() { _objHint.style.display = "none"; _objText.innerHTML = ""; // 移除关闭触发事件 myRemoveEventListener(_obj, 'blur', hide); myRemoveEventListener(document, 'mousedown', hide); }; init(); } --> </script> <script language="javascript" type="text/javascript"> <!-- /********************************************* - statInput 演示函数 *********************************************/ myAddEventListener(window, "load", testStatInput); function testStatInput(){ statInput('Test_1', 100, {_max : 'stat_max', _total : 'stat_total', _left : 'stat_left', _hint : true}); } /********************************************* - popHint 演示函数 *********************************************/ function testPopHint() { if($('Test2').value==''){ popHint($('Test2'), 'Test2不能为空...', {_event : 'blur'}); $('Test2').focus(); return false; } if($('Test3').value==''){ popHint($('Test3'), 'Test3也不能为空...', 'blur'); $('Test3').focus(); return false; } if($('Test4').value==''){ popHint($('Test4'), 'Test4虽然看不见,但也不能为空...'); $('Test4').value='填一点进去...'; return false; } if($('Test5').value==''){ popHint($('Test5'), 'Test5也一样...'); return false; } } --> </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> <br /> <br /> <br /> <br /> <br /> <div class="case"> <div class="title"><a href="#" class="r">Top</a>popHint 调用方法(目前只支持单行)</div> <div class="b">popHint(Element, Hint, {Type, Event});</div> <ul class="info gray"> <li><span class="key">Element:</span><span class="type">Object</span>弹出对象。根据它来定位的。 (*必须)</li> <li><span class="key">Hint:</span><span class="type">String</span>弹出的信息,支持HTML可是不能换行。 (*必须)</li> <li><span class="key">Type:</span><span class="type">String</span>弹出类型。其实说类型是不对的。只是定义个图标而已...(可自己在样式里加很多很多"类型") (*可选)</li> <li><span class="key">Event:</span><span class="type">String</span>关闭触发事件。目前只能绑定单个事件(默认click=document.onmousedown,blur=Element.onblur) (*可选)</li> </ul> <br /><span style="color: #333333" class="b">详见:<a href="http://bbs.blueidea.com/thread-2856572-1-1.html" target="_blank" >http://bbs.blueidea.com/thread-2856572-1-1.html</a></span> </div> <div class="case"> <div class="title"><a href="#" class="r">Top</a>popHint 演示</div> <ul class="demo gray"> <li>测试blur不关闭:<input name="Test1_0" id="Test1_0" type="text" size="20" maxlength="20" onfocus="popHint(this, '失去焦点不会关闭提示.按TAB键看看');" value="" /> <a href="###"> </a></li> <li>测试blur关闭:<input name="Test1_1" id="Test1_1" type="text" size="20" maxlength="20" onfocus="popHint(this, '文本框失去焦点就关闭.', {_event : 'blur'});" value="" /></li> </ul> <ul class="demo gray"> <li>Test2:<input name="Test2" id="Test2" type="text" size="20" maxlength="20" value="" /></li> <li>Test3:<input name="Test3" id="Test3" type="text" size="20" maxlength="20" value="" /></li> <li>Test4:<input name="Test4" id="Test4" type="hidden" size="20" maxlength="20" value="" /></li> <li>Test5:<input name="Test5" id="Test5" type="text" size="20" maxlength="20" value="" style="display:none" /></li> <li><input name="" type="button" onclick="testPopHint();" value="来测试啦" /></li> </ul> </div>更多代码请访问 <a href="http://www.awzsr.com/" target="_blank">爱问知识人网</a> </body> </html> |