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Wrong input.checked value

I'm trying to log the checked property of a radio element on click event. But It returns the wrong value.

const radio = document.querySelector('input[type=radio]')
radio.addEventListener('click', (ev) => {
  ev.preventDefault();
  console.log(ev.target.checked);
})

<p class="rInput">
  <input type="radio" name="R" id="ID">
  <label for="ID">The label</label>
</p>

When clicking on the radio it should log the checked status but it always logs true.

My solution to this was adding a timeOut of 0 millisecond, and it worked

const radio = document.querySelector('input[type=radio]')
radio.addEventListener('click', (ev) => {
  ev.preventDefault();
  setTimeout(() => {
    console.log(ev.target.checked);
  }, 0);
})

<p class="rInput">
  <input type="radio" id="ID">
  <label for="ID">The label</label>
</p>

But what is the problem and why this happens? Is there a better solution?

about 4 years ago · Juan Pablo Isaza

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Answer 1 · 2022-07-13T11:06:56.026Z

Ok so this is a bit of a weird question. Let me go try to explain why I call it a weird question:

You are setting a preventDefault on a radio button which would remove it's default properties (radio buttons are not the same input forms as regular buttons). The reason for that is that a regular button can have multiple states whereas Radio button have only 2 states namely- True & False.
You are checking only if the button isChecked by using console.log(rI.checked); therefore you will always log TRUE.

I hope that makes sense. As a follow up, I think you should CHECK out (pun intended) how to make a button unchecked. This here is a great answer on how to do it using JS without any frameworks.

UPDATED Code Snippet:

$(document).ready(function(){
    $('input[type="radio"]').click(function(){
        if($(this).prop("checked") === true){
            console.log("Checkbox is checked.");
        }
        else if($(this).prop("checked") === false){
            console.log("Checkbox is unchecked.");
        }
    });
});

Answer 2 · 2022-07-13T11:06:56.033Z

It would be simpler to just disable the radio button you don't want clicked.

const radios = document.querySelectorAll('input[type="radio"]');
radios.forEach(radio => radio.addEventListener('click', handleClick, false));

function handleClick(e) {
  const { id, checked } = e.target;
  console.log(id, checked);
};

<div>
  <label for="1">First
    <input name="radio" id="1" type="radio">
  </label>
  <label for="2">Second (disabled)
    <input name="radio" id="2" type="radio" disabled>
  </label>
  <label for="3">Last
    <input name="radio" id="3" type="radio">
  </label>
</div>

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Wrong input.checked value

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Andres GPT