Juste un petit code vite fait pour un tableau éditable ...
Sans doute améliorable (à vos éditeurs !)

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Nouvelle page 1</title>
<style type='text/css'>
td,#saisie { border:solid 1px black;
                 width:100px;
                 font-family:verdana;
                 font-size:12px;
                 line-height:20px;    }
html body {margin:0;}
 
     </style>
 
<script type='text/javascript'>
function Myinit(){
    var TabTr=document.getElementsByTagName('tr');
 
    for(i=0;TabTr[i];i++){
          var TabTd=TabTr[i].getElementsByTagName('td');
           for(j=0;TabTd[j];j++){ 
                          TabTd[j].id="Cell"+i+"_"+j;
                          TabTd[j].onclick=function(){edit(this)}
                          }
   }
 
 }     
 
 var currentCell
function edit(Obj){
  currentCell=Obj; 
  var editbox=document.getElementById('saisie')
  editbox.style.top=currentCell.offsetTop+'px';
  editbox.style.left=currentCell.offsetLeft+'px';
  editbox.style.width=currentCell.offsetWidth+'px';
  editbox.style.height=currentCell.offsetHeight+'px';
 
  editbox.style.display='';
  editbox.value=(currentCell.innerHTML!="&nbsp;")?currentCell.innerHTML:'';
  editbox.focus();
  editbox.value=editbox.value
  }
 
 
function copyValue(Box){
currentCell.innerHTML=(Box.value.length>0)?Box.value:"&nbsp;";
Box.value=""
}
 </script>    
 
</head>
 
<body onload="Myinit()">
<table >
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>    
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td></td>
            <td></td>
            <td></td>
            <td></td>
            <td></td>
            <td></td>
    </tr>        
</table>
 
<input type='text'    style='position:absolute;display:none;top:0;left:0;width:150px;' id='saisie' onblur="copyValue(this)"/>
 
</body>
le même avec des vrais morceaux de select entier dedans:

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<html>
<head>
 
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
 
<title>Nouvelle page 1</title>
<style type='text/css'>
td,#saisie { border:solid 1px black;
                 width:100px;
                 font-family:verdana;
                 font-size:12px;
                 line-height:20px;    }
 
html body {margin:0;}
 
     </style>
 
<script type='text/javascript'>
 
 var currentCell
function edit(Obj){
  currentCell=Obj; 
  var editbox=document.getElementById('saisie')
  editbox.style.top=currentCell.offsetTop+'px';
  editbox.style.left=currentCell.offsetLeft+'px';
  editbox.style.width=currentCell.offsetWidth+'px';
  editbox.style.height=currentCell.offsetHeight+'px';
  editbox.style.fontSize=currentCell.style.fontSize;
  editbox.style.display='';
  editbox.value=(currentCell.innerHTML!="&nbsp;")?currentCell.innerHTML:'';
  editbox.focus();
  editbox.value=editbox.value
  }
 
 
function editSelect(Obj1){
  editsel.style.width=currentCell.offsetWidth+'px';
  editsel.style.height=currentCell.offsetHeight+'px';
  var LesOptions=Obj1.getAttribute("ArrayOpt").split(';');
  while(editsel.options.length>1){editsel.removeChild(editsel.options[editsel.options.length-1])}
  editsel.style.top=currentCell.offsetTop+'px';
  editsel.style.left=currentCell.offsetLeft+'px';
  editsel.style.fontSize=currentCell.style.fontSize;
  editsel.style.visibility="visible";
 
  for(i=0;LesOptions[i];i++){
      var newOpt=document.createElement('option');
      newOpt.value=LesOptions[i];
      newOpt.innerHTML=LesOptions[i];
      if(newOpt.innerHTML==currentCell.innerHTML){newOpt.selected='selected';}
      editsel.appendChild(newOpt);
      }
   editsel.focus();   
  }  
 
function copyValue(Box){
 
TransValue="";
switch(Box.id){
  case "saisie" :   TransValue=(Box.value.length>0)?Box.value:"&nbsp;";
                        Box.value=""
                        Box.style.display='none';
                        break;
  case "MySel":     TransValue=(Box.options.selectedIndex==-1)?"&nbsp;":Box.options[Box.selectedIndex].value;
                        Box.style.top=0;
                        Box.style.left=0;
                        Box.style.visibility='hidden';    
                        break;
                        }
currentCell.innerHTML=TransValue;
}
 
 
function Myinit(){
    var TabTr=document.getElementsByTagName('tr');
 
    for(i=0;TabTr[i];i++){
          var TabTd=TabTr[i].getElementsByTagName('td');
           for(j=0;TabTd[j];j++){ 
                           TabTd[j].id="Cell"+i+"_"+j;
                           if(j==3){TabTd[j].onclick=function(){currentCell=this;
                                                                       editSelect(this)};
                                                                 }
                           else{TabTd[j].onclick=function(){edit(this)}}
                          }
   }
editsel=document.getElementById('MySel');                          
 }     
 
 </script>    
 
</head>
 
<body onload="Myinit()">
<table >
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td ArrayOpt="S;E;L">&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>    
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td ArrayOpt="Bonjour;Aurevoir;coucou; salut">&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td ArrayOpt="Bonjour;Aurevoir;coucou; salut">&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td ArrayOpt="Bonjour;Aurevoir;coucou; salut">&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
            <td ArrayOpt="Bonjour;Aurevoir;coucou; salut">&nbsp;</td>
            <td>&nbsp;</td>
            <td>&nbsp;</td>
    </tr>                
    <tr>
            <td></td>
            <td></td>
            <td></td>
            <td ArrayOpt="Bonjour;Aurevoir;coucou; salut"></td>
            <td></td>
            <td></td>
    </tr>        
</table>
 
<input type='text'    style='position:absolute;display:none;top:0;left:0;width:150px;' id='saisie' onblur="copyValue(this)" value=''/>
<select id="MySel" name="hello" style='position:absolute;visibility:hidden;top:0;left:0;width:150px;' onblur="copyValue(this)" >
<option value="&nbsp;">&nbsp;</option>
</select>            
 
</body>