Hola tengo un problema.....necesito hacer 3 select dinamicos dependientes, pro yo tengo un script para hacer 2 select nada mas pro el tercero no se como crearlo...ya q tengo poco conocimientos de javascript....
Código HTML:
<form method="post" name="form_combo" action="">
<table width="100%" border="0" cellspacing="2" cellpadding="2" class="style2">
<tr>
<td width="7%"> </td>
<td width="20%">Areas</td>
<td width="73%">
<? $result_categories = mysql_query("select * from sub_linea order by nombre"); ?>
<select name="id_category" class="stylen" onChange="redirect(this.options.selectedIndex)">
<option value="-1">Selecione</option>
<? while ($row_categories = mysql_fetch_array($result_categories)) { ?>
<option value="<? echo $row_categories["id"]; ?>">
<? echo $row_categories["nombre"]; ?> </option>
<? } ?>
</select> </td>
</tr>
<tr>
<td> </td>
<td>Aplicaciones</td>
<td>
<? $result_subcategories = mysql_query("select * from uso,area_posee_uso where area_posee_uso.id_uso='$id_category_combo' and uso.id=area_posee_uso.id_uso"); ?>
<select name="id_subcategory" class="stylen" onChange="redirect(this.options.selectedIndex)">
<option value="-1">Selecione</option>
<? while ($row_subcategories = mysql_fetch_array($result_subcategories)) { ?>
<option value="<? echo $row_subcategories["id"]; ?>">
<? echo $row_subcategories["nombre"]; ?> </option>
<? } ?>
</select> </td>
</tr>
<tr>
<td> </td>
<td>Categorias (Lineas) </td>
<td><? $result_lineas = mysql_query("select * from sub_linea,linea_pose_area where linea_posee_area.id_area='$id_sub_category' and linea.id=linea_posee_area.id_area"); ?>
<select name="id_linea" class="stylen">
<option value="-1">Selecione</option>
<? while ($row_lineas = mysql_fetch_array($result_lineas)) { ?>
<option value="<? echo $row_lineas["id"]; ?>">
<? echo $row_lineas["nombre"]; ?> </option>
<? } ?>
</select> </td>
</tr>
<tr>
<td> </td>
<td> </td>
<td><input type="submit" name="Submit2" value="Enviar" class="stylen" /></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
<? $result_categories_combo = mysql_query("select * from sub_linea order by nombre"); ?>
<script>
<!--
var groups=document.form_combo.id_category.options.length
var group=new Array(groups)
for (i=0; i<groups; i++)
group[i]=new Array()
//tercer select
var groups1=document.form_combo.id_subcategory.options.length
var group1=new Array(groups1)
for (i=0; i<groups1; i++)
group1[i]=new Array()
<? $group_i = 0; ?>
<? $group_j = 1; ?>
<?
while ($row_categories_combo = mysql_fetch_array($result_categories_combo))
{
$id_category_combo = $row_categories_combo["id"];
?>
<? $group_i = 0;
?>
<? $result_subcategories_combo = mysql_query("select * from uso,area_posee_uso where area_posee_uso.id_area='$id_category_combo' and uso.id=area_posee_uso.id_uso");
?>
//document.form_combo.id_subcategory.length =<? //$num = mysql_num_rows($result_subcategories_combo); echo $num;?>;
group[0][<? echo $group_j; ?>]=new Option("<? echo $row_categories_combo["nombre"]; ?>","<? echo $row_categories_combo["id"]; ?>")
<? while ($row_subcategories_combo = mysql_fetch_array($result_subcategories_combo))
{
?>
group[<? echo $group_j; ?>][<? echo $group_i; ?>]=new Option("<? echo $row_subcategories_combo["nombre"]; ?>","<? echo $row_subcategories_combo["id"]; ?>")
<? $group_i++;
}//fin while subcategorias
?>
<? $group_j++;
} //fin while categorias
?>
var temp=document.form_combo.id_subcategory
function redirect(x)
{
for (m=temp.options.length-1;m>0;m--)
temp.options[m]=null
for (i=0;i<group[x].length;i++)
{
temp.options[i]=new Option(group[x][i].text,group[x][i].value)
}
temp.options[0].selected=true
}
//-->
</script>
</form>
</body>
</html> si me podrian ayudar a resolver esto por favor...es q lo necesito urgente....
