Javascript Sum function return NaN [duplicate]

Question

function increase( y) {
    var x = document.getElementById("result");
    var before= x.value;
    x.innerHTML= Number(before) + Number(y);
}

<b>Rp. <b id='result'>1240000</b> </b>
<button type="button" onclick="increase(80000)"> add </button>

Sudhir Ojha · Accepted Answer · 2020-07-30 10:15:07Z

0

You have to use innerHTML to get the value of <b>.

function increase( y) {
  var x = document.getElementById("result");
  x.innerHTML= parseInt(x.innerHTML) + parseInt(y);
}

<b>Rp. <b id="result">1240000</b> </b>
<button type="button" onclick="increase(80000)"> add </button>

answered Jul 30, 2020 at 10:15

Sudhir Ojha

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