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validar um select


Claraa
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Ele não ta verificando e ta entrando direto no action.

<form name="form" onsubmit="return validar()" action="entrou.html">
  Sexo2: <select name="select">
		 <option selected disabled> Selecione uma opção </option>
		 <option> Feminino </option>
		 <option> Masculino </option>
		 <option> Outro </option>
		 <span id="at"></span>
	</select> 

	<br>
	<br>

	<input type="submit" value="enviar" > 

</form>
function validar() {

    if(form.select.options[select.selectedIndex].value=""){
    var at = document.getElementById('at');
    at.innerHTML = "selecione uma opção"
    return false;
}
}

 

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