What is the best way to implement or disable a function when toggling a switch in pure JavaScript?

I'm currently facing an issue with my transliteration function that is supposed to be executed only when the checkbox is checked. The problem is, even after unchecking the checkbox, the function still continues to run.

const checkBox = document.querySelector("#checkbox");
const input = document.querySelector("#input");

function transRussian(){
  ch = ch.replace(/l/g, "л");
  ch = ch.replace(/p/g, "п");
  return ch;
}

checkBox.addEventListener('change',()=>{
  if(checkBox.checked){
    transliterate();
  }
  else{
    console.log("transliteration is turned off")
  }
});

input.addEventListener('keyup',()=>{
  var ch = input.value;
  transRussian(ch);
  input.value = ch;
});
<input type="checkbox" id="checkbox">
<input type="text" id="input">

Answer №1

When the user clicks on the translation checkbox, the translateBlock() function is triggered to change the text inside the textarea element based on certain logic.

/* A let variable is declared instead of a const to allow content modification. */
let checkBox = document.getElementById('checkbox');
let input = document.getElementById('input');

function transRussian(ch){
  ch = ch.replace(/l/g, "л");
  ch = ch.replace(/p/g, "п");
  return ch;
}

function translateBlock(){
  var ch = input.value;
  input.value = transRussian(ch);
}

/* The control variable is set to true when the checkbox is clicked. */
input.addEventListener('keyup', () => {
  if(checkBox.checked)
    translateBlock();
});

/* This method runs when data is entered in the textarea element. */
checkBox.addEventListener('change', () => {
  if(checkBox.checked)
    translateBlock();
  else
    console.log("transliteration is turned off")
});
textarea{
  display: block;
}
<span>Translate</span>
<input type="checkbox" id="checkbox"/>

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</textarea>

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