jQuery check for none empty input

Solution:1

Maybe use the jQuery change event

$('#section-logo input').change( function() {
    if ( $(this).val() !== "" ) {
        logo_position_section.show();
    }
}

Solution:2

Use following code

 $(document).on('input', '#amt', function(){
    let r1;
    let r2;
    r1 = $("#remittance_amt").val();
    if(r1 === undefined || r1 === null || r1 === '')
    {
      r1 = 0.00;
    }

    console.log(r1);
  });

Solution:3

Use following code

$('#apply-form input').blur(function() {
     if(!$.trim(this.value).length) { // zero-length string AFTER a trim
            $(this).parents('p').addClass('warning');
     }
});