PIRRUMAN gracias por responder
estoy trantando de implementar tu codigo para 4 checkbox por no me funciona
le ves algun error?
gracias
<html>
<head>
<script type="text/javascript">
function calcular(obj){
var val = (obj.checked == true)? obj.id.split("_")[1] : 0;
obj.value = val;
document.getElementById("text_"+ obj.id.split("_")[1]).value = val;
}
</script>
<script languaje="javascript">
function checkedAll(totalchecks)
{
for(i=1;i<=totalchecks;i++)
{
document.getElementById('check'+i).checked=documen t.getElementById('checkall').checked;
}
calcular(totalchecks);
}
function calcular(totalchecks)
{
for(i=1;i<=totalchecks;i++)
{
if (document.getElementById('check'+ i).checked==true)
{
document.getElementById('check'+ i).value=1;
document.getElementById('text'+ i).value=document.getElementById('check'+i).value;
}
else
{
document.getElementById('check'+i).value=0;
document.getElementById('text'+i).value=document.g etElementById('check'+i).value;
}
}
}
</script>
</head>
<body>
<?
$totalcheck="4";
?>
<form action="respueta.php" method="post" name="uno" id="uno">
<p>
<input name="uno" type='checkbox' id="check1" onclick='calcular(<?echo $totalcheck?>)'/>
Cambia Value del checkbox:
<input name="uno" type="text" id="text1" />
<br />
<input name="dos" type='checkbox' id="check2" onclick='calcular(<?echo $totalcheck?>)'/>
Cambia value del checkbox:
<input name="dos" type="text" id="text2" />
<br />
<input name="tres" type='checkbox' id="check3" onclick='calcular(<?echo $totalcheck?>)'/>
Cambia Value del checkbox:
<input name="tres" type="text" id="text3" />
<br />
<input name="tres" type='checkbox' id="check4" onclick='calcular(<?echo $totalcheck?>)'/>
Cambia Value del checkbox:
<input name="tres" type="text" id="text4" />
<br />
<label>
<input name="submit" type="submit" id="submit" value="Enviar" />
</label>
</p>
<input type='checkbox' name='checkall' id="checkall" onclick='checkedAll(<?echo $totalcheck?>);'/>
</form>
</body>
</html>