javascript update tag value property

[victor sosa]

Hi, I am trying to update a textfield when the select is changed using
javascript event onchange, so How I can do that? Which is the best practices
here?


Here is my code, any Ideas?

        <script type="text/javascript">
                function getVolumenInicial() {
                        var volumenInicial = 
document.getElementById('save_volumenInicial');
                        var maquinaSelected = 
document.getElementById('save_maquina_codigo');
                        volumenInicial.value = '%{maquinas[' + 
maquinaSelected.selectedIndex +
'].metro}';
                }
        </script>
.....
                <s:select label="Máquina" name="maquina.codigo" 
list="maquinas"
onchange="getVolumenInicial();"
                        value="%{maquina.codigo}" required="true" 
listKey="codigo"
listValue="codigo" />
 
                <s:textfield label="Volumen Inicial" name="volumenInicial" 
                        value="%{venta.volumenInicial}" readonly="true" 
size="7" maxlength="9" />

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