The effect of text box displaying js line number (compatible with multiple browsers)

The effect of text box displaying js line number (compatible with multiple browsers)_javascript skills

WBOY

Release： 2016-05-16 15:35:22

Original

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A very practical and simple text editing box created using js, which can display line numbers and is compatible with mainstream browsers such as IE and Firefox, as shown below:

The following is the source code of this effect:

<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"> 
<title>显示行号的文本框效果，兼容ie、火狐等浏览器</title> 
<style type="text/css"> 
#main{color:#666} 
textarea{border:1px solid #7f9db9;font-size:9pt;width:430px;color:#000} 
.grey{color:#999} 
#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:32px;border-right:0;line-height:20px;margin:0px;padding:0px;text-align:center} 
#c2{font-family:Arial, Helvetica, sans-serif;height:160px; margin:0px; width:416px;padding:0 0 0 35px;overflow-x: hidden;line-height:20px;} 
</style> 
<script type="text/javascript"> 
String.prototype.trim2=function(){ 
  return this.replace(/(^\s*)|(\s*$)/g, ""); 
} 
function F(objid){ 
  return document.getElementById(objid).value; 
} 
function G(objid){ 
  return document.getElementById(objid); 
} 
</script> 
</head> 
<body onLoad="keyUp();"> 
<div> 
<table width="100%" border="0" cellspacing="0" cellpadding="0" style="position:relative"> 
 <tr> 
  <td width="55%"> 
  <div id="ol"><textarea cols="2" rows="10" id="li" disabled></textarea></div> 
  <textarea name="co" cols="60" rows="10" wrap="off" id="c2" onblur="check('2')" onKeyUp="keyUp()" onFocus="clearValue('2')" onscroll="G('li').scrollTop=this.scrollTop;" oncontextmenu="return false" class="grey">请在这里粘入多段字看一看。 
</textarea>   
  </td> 
  </tr> 
</table> 
</div> 
<em class="block" id="msg2">文本框没有内容。</em> 
<script type="text/javascript"> 
var msgA=["msg1","msg2","msg3","msg4"]; 
var c=["c1","c2","c3","c4"]; 
var slen=[50,20000,20000,60];//允许最大字数 
var num="";
var isfirst=[0,0,0,0,0,0]; 
function isEmpty(strVal){ 
 if( strVal=="" ) 
 return true; 
 else 
 return false; 
} 
function isBlank(testVal){  
  var regVal=/^\s*$/; 
  return (regVal.test(testVal)) 
} 
function chLen(strVal){ 
 strValstrVal=strVal.trim2(); 
 var cArr=strVal.match(/[^\x00-\xff]/ig); 
  return strVal.length+(cArr==null &#63; 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; 
 strstr=str.replace(/\r/gi,""); 
 strstr=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>

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The above is the source code of how JavaScript implements the text box effect of line number display. I hope it will be helpful to everyone's learning.