显示行号的文本输入框

<HTML> 
<HEAD> 
<TITLE>DirMap</TITLE> 
<meta http-equiv='Content-Type' content='text/html; charset=gb2312'> 
</HEAD> 
<style> 
* { 
 font-size: 12px 
} 
body { 
 margin: 10px; padding: 0px 
} 
A { 
 COLOR: black; TEXT-DECORATION: none; 
} 
A:hover { 
 COLOR: black; TEXT-DECORATION: none; 
} 
A:link { 
 TEXT-DECORATION: none 
} 
A:visited { 
 TEXT-DECORATION: none 
} 
table.list{ 
 cursor: default; 
 border:1px solid #cccccc 
 background-color: #cccccc; 
 border-collapse: collapse; 
 border-Color: #cccccc; 
} 
</style> 
<script> 
function check_form() { 
 var the_form = document.forms[0]; 
 if(!/^[\w\.]+$/.test(the_form.name.value)) { 
  alert('Bad File Name !'); 
  the_form.name.focus(); 
  return false; 
 } 
 if(!/^[0-7]{3}$/.test(the_form.attrib.value)) { 
  alert('Bad File Attrib !'); 
  the_form.attrib.focus(); 
  return false; 
 } 
 if(the_form.del.checked) { 
  return confirm('Are you sure to delete the file ?'); 
 } 
 return true; 
}

function show_ln(){ 
 var txt_ln  = document.getElementById('txt_ln'); 
 var txt_main  = document.getElementById('txt_main'); 
 txt_ln.scrollTop = txt_main.scrollTop; 
 while(txt_ln.scrollTop != txt_main.scrollTop) { 
  txt_ln.value += (i++) + '\n'; 
  txt_ln.scrollTop = txt_main.scrollTop; 
 } 
 return; 
}

function editTab(){ 
 var code, sel, tmp, r 
 var tabs='' 
 event.returnValue = false 
 sel =event.srcElement.document.selection.createRange() 
 r = event.srcElement.createTextRange()

switch (event.keyCode){ 
  case (8) : 
   if (!(sel.getClientRects().length > 1)){ 
    event.returnValue = true 
    return 
   } 
   code = sel.text 
   tmp = sel.duplicate() 
   tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top) 
   sel.setEndPoint('startToStart', tmp) 
   sel.text = sel.text.replace(/^\t/gm, '') 
   code = code.replace(/^\t/gm, '').replace(/\r\n/g, '\r') 
   r.findText(code) 
   r.select() 
   break 
  case (9) : 
   if (sel.getClientRects().length > 1){ 
    code = sel.text 
    tmp = sel.duplicate() 
    tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top) 
    sel.setEndPoint('startToStart', tmp) 
    sel.text = '\t'+sel.text.replace(/\r\n/g, '\r\t') 
    code = code.replace(/\r\n/g, '\r\t') 
    r.findText(code) 
    r.select() 
   }else{ 
    sel.text = '\t' 
    sel.select() 
   } 
   break 
  case (13) : 
   tmp = sel.duplicate() 
   tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top) 
   tmp.setEndPoint('endToEnd', sel)

for (var i=0; tmp.text.match(/^[\t]+/g) && i<tmp.text.match(/^[\t]+/g)[0].length; i++) tabs += '\t' 
   sel.text = '\r\n'+tabs 
   sel.select() 
   break 
  default  : 
   event.returnValue = true 
   break 
 } 
} 
</ script> 
<BODY> 
<table width='700' class='list' border='1' bgcolor='#eeeeee' bordercolorlight='#000000' bordercolordark='#FFFFFF' cellpadding='0' cellspacing='0'> 
  <tr bgcolor='#cccccc'>  
    <td colspan='2' height='20'>  
      <div align='center'><b>File Information</b> </div> 
    </td> 
  </tr> 
  <tr>  
    <td colspan='2'> 
 
       
    </td> 
  </tr> 
</table> 
</BODY> 
</HTML>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

显示行号的文本输入框_javascript技巧