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'>  
      <b>File Information</b>  
    </td> 
  </tr> 
  <tr>  
    <td colspan='2'> 
 
      <form name='edit' method='post' action='fso_edit.php' onsubmit='return check_form()'> 
        <table width='90%' border='0' align='center' > 
          <tr>  
            <td>Name ：</td> 
            <td><input type='text' name='name' value='upload_manager.class.php'></td> 
          </tr> 
          <tr>  
            <td valign='top'>Time ：</td> 
            <td>2003-10-02 00:55:59</td> 
          </tr> 
          <tr>  
            <td>Attrib ：</td> 
            <td><input type='text' name='attrib' value='666'> (rw-rw-rw-)</td> 
          </tr> 
          <tr>  
            <td>MoveTo ：</td> 
            <td> 
              <select name='move'> 
                <option value=''>NoMove</option> 
                <option value='../fso/../'>Parent Direction</option>

</select> 
            </td> 
          </tr> 
           <tr>  
             <td>Size ：</td> 
             <td>6.2 KB</td> 
           </tr> 
           <tr>  
             <td valign='top'>Content ：</td> 
             <td> 
               <textarea id='txt_ln' name='content' rows='10' cols='4' style='overflow:hidden;height:200px;border-right:0px;text-align:right' readonly></textarea><textarea id='txt_main' name='content' rows='10' cols='70 'onkeydown='editTab()' onChange="document.forms[0].modi.value='ture'" onscroll='show_ln()' wrap='off' style='overflow:auto;height:200px;padding-left:5px;border-left:0px'> 
/******************************************** 
*                                           * 
* Name    : Upload Manager                  * 
* Author  : Windy_sk                        * 
* Time    : 2003-05-10                      * 
* Email   : flyhorses@sina.com              * 
* HomePage: None (Maybe Soon)               * 
* Notice  : U Can Use & Modify it freely,   * 
*           BUT PLEASE HOLD THIS ITEM.      * 
*                                           * 
********************************************/ 
class Upload_Manager { 
 var $upload_path = ""; 
 var $upload_counter = 0; 
 var $upload_result = array(); 
 var $upload_rename = false;

function Upload_Manager($upload_path = 'upload/', $upload_rename = false, $relative = false) {

}

</textarea> 
               <script>for(var i=1; i<=20; i++) document.getElementById('txt_ln').value += i + '\n';</script> 
               <input type='hidden' name='modi' value=''> 
             </td> 
           </tr> 
   
          <tr>  
            <td colspan='2'>  
              
 
                <input type='hidden' name='name_org' value='upload_manager.class.php'> 
                <input type='hidden' name='path' value='../fso'> 
                <input type='Submit' value=' 确 定 ' name='Submit'>   
                <input type='reset' value=' 重 置 ' name='reset'>   
                <input type='checkbox' value='true' name='del'> 删 除 
               
            </td> 
          </tr> 
        </table> 
      </form> 
    </td> 
  </tr> 
</table> 
</BODY> 
</HTML>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]