Descobri qual é, é o select. Fiz assim
Code:
<script type="text/javascript">
function selectAllOptions(field) {
with(field) {
for(i = 0; i < field.options.length; i++) {
field.options[i].selected = true;
}
}
}
</script>
Code:
<form action="UsuariosAction.insereUsuario.mtw" onsubmit="selectAllOptions(document.forms[0].filasUsr)" method="post" >
<mtw:select id="filasCad" name="filasCad" list="listFilasCad" multiple="true"/>
<mtw:selectBox listFrom="filasCad" listTo="filasUsr" name="selBoxFilaUsr"/>
<mtw:select id="filasUsr" name="filasUsr" list="listFilasUsr" multiple="true"/>
<input type="image" value="${imgSave}" src="images/icons/22x22/apply.png" title="${imgSave}"/>
Detalhe para document.forms[0], onde 0 representa a quantidade de forms que existe na jsp.