<!DOCTYPE html>
<html>
<body>
<form id="form1">
<select id="select1" onclick="cambiaForm2(this.value)">
<option value = "0" selected> </option>
<option value = "A">A</option>
<option value = "B">B</option>
</select>
</form>
<form id="form2">
<select id="select2"></select>
</form>
<script>
function cambiaForm2(seleccion) { var sel1=["A1", "A2", "A3"];
var sel2=["B1", "B2", "B3"];
var select2=document.getElementById("select2");
select2.innerHTML="";
switch (seleccion) { case "A":
for (i in sel1){ var opcion = document.createElement("option"); opcion.value = sel1[i];
var texto = document.createTextNode(sel1[i]);
opcion.appendChild(texto);
select2.appendChild(opcion);
}
break;
case "B":
for (i in sel2){ var opcion = document.createElement("option"); opcion.value = sel2[i];
var texto = document.createTextNode(sel2[i]);
opcion.appendChild(texto);
select2.appendChild(opcion);
}
break;
}
}
</script>
</body>
</html>
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