textarea 行数展示
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>在文本框中显示行号，兼容浏览器IE、FF</title>
<style type="text/css">
.b1{height:20px;border:1px solid #7f9db9;line-height:20px; padding:0}
input.btn{height:auto; font-size:14px; font-weight:bold; color:#000}
#main {color:#666}
textarea{border:1px solid #7f9db9; font-size:14px; width:448px; color:#000}
input{font-size:14px; color:#000}
#main h3{color:#000}
.grey{color:#999}
em{font-style:normal; color:#FF0000; font-size:12px;}
#msg1,#msg2,#msg3,#msg4{ display:none}
#ol{position:absolute; z-index:1; padding:0px; margin:0px; border:0px; background:#ecf0f5;width:23px; text-align:left; }
#li{background:#ecf0f5; height:160px; overflow:hidden; width:23px; border-right:0; line-height:20px; margin:0px; padding:0px; padding-left:2px; text-align:center}
#c2{font-family:Arial, Helvetica, sans-serif; height:160px; margin:0px; width:420px; padding:0 0 0 28px; overflow-x: hidden; line-height:20px;}
</style>
<script language="javascript" type="text/javascript">
String.prototype.trim2 = function() {
return this.replace(/(^\s*)|(\s*$)/g, "");
}
function F(objid){
return document.getElementById(objid).value;
}
function G(objid){
return document.getElementById(objid);
}
</script>
</head>
<body onLoad="keyUp();">
<h3><em>*</em>专辑曲目：</h3>
<div>
<table width="900" border="0" cellspacing="0" cellpadding="0" style="position:relative">
<tr>
<td width="55%">
<div id="ol">
<textarea cols="2" rows="10" id="li" disabled></textarea>
</div>
<textarea name="co" cols="60" rows="10" wrap="off" id="c2" onblur="check('3')" onkeyup="keyUp()" onFocus="clearValue('2')" onscroll="G('li').scrollTop = this.scrollTop;" oncontextmenu="return false" class="grey">牛仔很忙 周杰伦 吻别 张学友 Colorful Days 朴树 美丽的神话 韩红 孙楠</textarea>
</td>
<td width="45%" valign="top">
<p>在文本框中显示行号，兼容浏览器ie、ff</p>
<p>输入内容回车换行，会显示行号。支持粘贴。js代码是从工作中的代码摘出来的，可能有些冗余。</p>
</td>
</tr>
</table>
</div> <em class="block" id="msg2">不能为空。</em>
<script language="javascript" type="text/javascript">
var msgA=["msg1","msg2","msg3","msg4"];
var c=["c1","c2","c3","c4"];
var slen=[50,20000,20000,60];//允许最大字数
var num="";
var isfirst=[0,0,0,0,0,0];
function isEmpty(strVal){
if( strVal == "" )
return true;
else
return false;
}
function isBlank(testVal){
var regVal=/^\s*$/;
return (regVal.test(testVal));
}
function chLen(strVal){
strVal=strVal.trim2();
var cArr = strVal.match(/[^\x00-\xff]/ig);
return strVal.length + (cArr == null ? 0 : cArr.length);
}
function check(i){
var iValue=F("c"+i);
var iObj=G("msg"+i);
var n=(chLen(iValue)>slen[i-1]);
if((isBlank(iValue)==true)||(isEmpty(iValue)==true)||n==true){
iObj.style.display ="block";
}else{
iObj.style.display ="none";
}
}
function checkAll(){
for(var i=0;i<msgA.length; i++){
check(i+1);
if(G(msgA[i]).style.display=="none"){
continue;
}else{
alert("填写错误,请查看红色提示信息！");
return;
}
}
G("form1").submit();
}
function clearValue(i){
G(c[i-1]).style.color="#000";
keyUp();
if(isfirst[i]==0){ G(c[i-1]).value=""; } isfirst[i]=1;
}
function keyUp(){
var obj=G("c2");
var str=obj.value;
str=str.replace(/\r/gi,"");
str=str.split("\n"); n=str.length; line(n);
}
function line(n){
var lineobj=G("li");
for(var i=1;i<=n;i++){
if(document.all){
num+=i+"\r\n";
}else{
num+=i+"\n";
}
}
lineobj.value=num; num="";
}
function autoScroll(){
var nV = 0;
if(!document.all){
nV=G("c2").scrollTop;
G("li").scrollTop=nV;
setTimeout("autoScroll()",20);
}
}
if(!document.all){
window.addEventListener("load",autoScroll,false);
}
</script>
</body>
</html>