Crear dinámicamente con Javascript select con optgroup
Supongamos que tenemos un array de objetos javascript. Cada objeto tiene tres propiedades: cod, tex, grupo.
Estos objetos son los elementos que queremos representar en un SELECT, y agrupados en OPTGROUPS.
Código:
var grupo_anterior="";var grupo;var opcion;
for (var i in array_options){ if(grupo_anterior!=array_options[i].grupo){ //reconocido nuevo grupo
grupo = document.createElement('OPTGROUP'); grupo.label = array_options[i].grupo; grupo_anterior = array_options[i].grupo; select.appendChild(grupo); } opcion = document.createElement("OPTION"); opcion.setAttribute("value",array_options[i].cod); //se le pone el texto visible
opcion.innerHTML = array_options[i].tex; //se incluye en el grupo
select.appendChild(opcion);}Este código sería lo fundamental para entender cómo funciona. Ha quedado pendiente la variable select, que representa el objeto select en el que inclñuiremos las opciones. Éste es necesario tomarlo, por ejemplo a partir del id con getElementById, o bien pasándolo como parámetro a la función en la que incluyamos este código.
Aquí un ejemplo completo que funciona y se puede probar copiandolo en una página html:
<script>
function Objeto(cod,tex,grupo){ this.cod=cod; this.tex=tex; this.grupo=grupo;}
function pintaOptions(){
var select = document.getElementById('prueba');
var array_options = new Array(); array_options['a'] = new Objeto('1','elemento 1','grupo1'); array_options['b'] = new Objeto('2','elemento 2','grupo1'); array_options['c'] = new Objeto('3','elemento 3','grupo2'); array_options['d'] = new Objeto('4','elemento 4','grupo2');
var grupo_anterior=""; var grupo; var opcion;
for (var i in array_options){ if(grupo_anterior!=array_options[i].grupo){ grupo = document.createElement('OPTGROUP'); grupo.label = array_options[i].grupo; grupo_anterior = array_options[i].grupo; select.appendChild(grupo); } opcion = document.createElement("OPTION"); opcion.setAttribute("value",array_options[i].cod); opcion.innerHTML = array_options[i].tex; select.appendChild(opcion); }}
</script>
<select id="prueba"> <script>pintaOptions();</script></select>El resultado es:
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