Trazer dados na tela

by Rapha Souza

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<!DOCTYPE html>
<html>
<body>
<label>Inicio</label>
<input type="text" id="UM_INI_DATABASE" name="UM_INI_DATABASE">

<label>Fim</label>
<input type="text" id="UM_FIM_DATABASE" name="UM_FIM_DATABASE">
<label>Dias</label>
<input type="text" id="UM_SALDO_DIAS_FER" name="UM_SALDO_DIAS_FER">

<button onclick="diasRestantesPeriodo()">Try it</button>
<br>
Você possui <a id="diasDispPeriodo"></a> dias restantes referente ao período <a id="demo"></a> - <a id="demo2"></a> 

<script>
function diasRestantesPeriodo() {
    var str3 = document.getElementById("UM_SALDO_DIAS_FER").value;
   var str1 =  document.getElementById("UM_INI_DATABASE").value;
    var str2 = document.getElementById("UM_FIM_DATABASE").value;
    
    var res = str1.concat(str2);
         document.getElementById("diasDispPeriodo").innerHTML = str3;
    document.getElementById("demo").innerHTML = str1;
     document.getElementById("demo2").innerHTML = str2;

     
}
</script>

</body>

</html>

CSS

.row {
  background: #f8f9fa;
  margin-top: 20px;
}

.col {
  border: solid 1px #6c757d;
  padding: 10px;
}