演示地址：點我
測試代碼如下：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title></title> <style> /*文本框顯示行號*/ #msg1,#msg2,#msg3,#msg4{ display:none } #ol{ position:absolute; top: 17px; left: 17px; height: 205px; z-index:1; padding:0; margin:0; border:0; background:#ecf0f5; width:23px; text-align:left; resize: none; opacity: 0.5; } #li{ background:#ecf0f5; height:199px; overflow:hidden; width:32px; border:none; line-height:20px; margin:0; padding-top:13px; text-align:center; resize: none; } .texts{ float: left; width: 566px; height: 200px; line-height: 20px; font: 18px Courier New,?sans-serif; border: 5px solid #f18200; border-radius: 2px; resize: none; padding: 5px 0 0 45px; margin: 12px; overflow: auto; } </style></head><body> <div class="search"> <div id="ol"> <textarea id="li" cols="2" rows="10" disabled></textarea> </div> <textarea id="c2" name="co" class="texts" cols="40" rows="3" wrap="off" onblur="check('2')" onkeyup="keyUp()" onFocus="clearValue('2')" onscroll="G('li').scrollTop = this.scrollTop;" oncontextmenu="return false" placeholder="請輸入正確快遞單號,多個單號以換行分隔"></textarea> </div> <script src="../js/jquery-1.11.3.js"></script> <script type="text/javascript"> /*文本框顯示行號*/ String.PRototype.trim2 = function() { return this.replace(/(^/s*)|(/s*$)/g, ""); } function F(objid){ return document.getElementById(objid).value; } function G(objid){ return document.getElementById(objid); } /*文本框顯示行號*/ var msgA=["msg1","msg2","msg3","msg4"]; var c=["c1","c2","c3","c4"]; var slen=[50,20000,20000,60];//允許最大字數 var num=""; var isfirst=[0,0,0,0,0,0]; function isEmpty(strVal){ if( strVal == "" ){ return true; }else{ return false; } } function isBlank(testVal){ var regVal=/^/s*$/; 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("填寫錯誤,請查看提示信息！"); 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>新聞熱點
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