Get the value from the combo box after user selection is not working!

[Aux9]

Hi..
Please is there a way to get the value from the combo box after user selection?
because for me it always returns empty string but I can see in the debugger that there is a value but the html value attribute tag is empty, I'm so confused.

the value is there in the debugger:

but in console is empty:

I'm using onblur event with a function like this:

function testValue(el) {
           //test 1 not working
            const el2 = document.querySelector("input[name='xxx']");  //test 1 not working
            console.log('el2 value: ' + el2.value);

           //test 2 not working
            console.log('el value: ' + el.value); //test 2 not working
        }