search

Home  >  Article  >  Web Front-end  >  The effect of text box displaying js line number (compatible with multiple browsers)_javascript skills

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

WBOY
WBOYOriginal
2016-05-16 15:35:221287browse

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>

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.

Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：The tab style online customer service effect code in the lower right corner of the webpage implemented by jQuery_jqueryNext article：The tab style online customer service effect code in the lower right corner of the webpage implemented by jQuery_jquery

Related articles

See more