Delete last entered digit

Question

I’m creating a calculator, using HTML and Javascript. My goal was that it had itself a button that allows the user to delete the last entered value (for example, the user enters the number 9 and then 8 and form 98, but he wants to erase the 8, then he pushes that button to make the value go back to being just 9), but I’m not being able to create a function for that.

I would like a code, in Javascript, to solve this problem.

Answer 1

Use the method substring, input.value = inputText.substring(0,inputText.length-1);

<input id="input" type="text"/>
<button onclick="apagar()">Apagar</button>

<script>
function apagar() {
  let input = document.getElementById('input');
  let inputText = input.value;
  input.value = inputText.substring(0,inputText.length-1);
  console.log(input.value);
}</script>

Answer 2

You can use the function slice:

var str=document.getElementById("campo-com-o-valor").value;
str = str.slice(0, -1);