Pass value from a function to value in Javascript input

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I have an input where the person should enter the date of birth, when she type, automatically already calls a function that makes the calculation of age. After that I would like the age value to be automatically passed to input value below birth date, but I’m not getting it.

//input recebe a data de nascimento
<input class="form-control fc-datepicker" placeholder="DD/MM/AAAA" type="text" id="data_nascimento" onblur="calcularIdade(this.value);">

//calcula a idade  
    <script type = "text/javascript" >
      function calcularIdade(aniversario) {
        var nascimento = aniversario.split("/");
        var dataNascimento = new Date(parseInt(nascimento[2], 10),
          parseInt(nascimento[1], 10) - 1,
          parseInt(nascimento[0], 10));

        var diferenca = Date.now() - dataNascimento.getTime();
        var idade = new Date(diferenca);

        return alert(Math.abs(idade.getUTCFullYear() - 1970));

    </script>

//input que recebe a idade
    <input class="form-control fc-datepicker" value="" disabled type="text" id="idade">
javascript

1 answer

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Just take input by id and change its value:

document.getElementById("idade").value = Math.abs(idade.getUTCFullYear() - 1970);

Only you have to do it before the return and after the variable idade.

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