$("#typeftp").click(function(){
$("#connectportnum").val(isNotEmpty($("#ftphiden").val()) ? $("#ftphiden").val() : '00');
$("#ftpspan").css("display:","block");
$("#sftpspan").css("display:","none");
document.getElementById("ftpspan").style.display="block";
document.getElementById("sftpspan").style.display="none";
});
$("#typesftp").click(function(){
$("#connectportnum").val(isNotEmpty($("#sftphiden").val()) ? $("#sftphiden").val() : '00');
document.getElementById("ftpspan").style.display="none";
document.getElementById("sftpspan").style.display="block";
});
$("#ssh").click(function(){
$("#cmdportnum").val(isNotEmpty($("#sshhiden").val()) ? $("#sshhiden").val() : '00');
document.getElementById("sshspan").style.display="block";
document.getElementById("telnetspan").style.display="none";
});
$("#telnet").click(function(){
$("#cmdportnum").val(isNotEmpty($("#tethiden").val()) ? $("#tethiden").val() :00);
document.getElementById("telnetspan").style.display="block";
document.getElementById("sshspan").style.display="none";
});
<input type="input" name="cmdPortnum" id="cmdportnum" value="${mdPortnum }" maxlength="5"/>
<input type="hidden" id="telnethiden" value=""/>
<input type="hidden" id="shhiden" value=""/>
<input id="portnum" name="connectPortnum" value="${.connectPortnum}" maxlength="5"/>
<input type="hidden" id="ftphiden" value=""/>
<input type="hidden" id="sftphiden" value=""/>