shell script to identify input entered or not

SCRIPT:

#!/bin/bash

echo -n "enter any value : "

read val

if [[ -n $val ]]

then

    echo "input entered"

else

    echo "not entered"

fi

OUTPUT:

i)run -> ./enter.sh

enter any value :
not entered
 

ii)run -> ./enter.sh

enter any value : hi
input entered