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Passando parametros php para javascript



estou com um problema ao passar parametros do php para o jsp.

miha funcao esta exatamente assim:

function selecionaDisciplina() {
            if ( frm.cboDisciplina.value != "" ) {
                frm.action = "sala_alunos.php?sala=<?php echo $sala?>&disciplina=" + frm.cboDisciplina.value;

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não to vendo você passando nada para jsp...

frm.cboDisciplina.value vem nullo ? e a variável $sala tb ?

já experimentou imprimir pra ver como fica a url ?

"frm.cboDisciplina.value" troque isso...por isso...document.getElementById("cboDisciplina")

...espero ter ajudado....

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