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changing css style with javascript

I wrote a html with 3 radio buttons. Each radio button is contained in a div container. I would like that if a radio button is checked, the background of the div container containing the checked radio-button should become blue, and the background the div containing the other unchecked radio-buttons should be white. I tried to achieve that with javascript and css, but it does not work. Could someone please help me to write correctly this javascript ?.

<!DOCTYPE html>
<html>
<style>
  .stylingForCheckedRadioButton {
    color: white;
    background-color: blue;
    border-style: solid;
    border-width: thin;
    border-color: grey;
    margin-bottom: 7px;
    width: 10%;
    height: 50px;
    border-radius: 6px;
  }

  .stylingForUnCheckedRadioButton {
    color: black;
    background-color: white;
    border-style: groove;
    border-width: thin;
    border-color: #DCDCDC;
    margin-bottom: 7px;
    width: 10%;
    height: 50px;
    border-radius: 6px;
  }
</style>

<script type="text/javascript">
function checkValue(containerId) {
    const rbs = document.querySelectorAll('input[name = "radiobutton"]');
    let selectedValue;
    for (const rb of rbs) {
      if (rb.checked) {
        document.getElementById(containerId).style = "stylingForCheckedRadioButton";
      }else{
        document.getElementById(containerId).style  = "stylingForUnCheckedRadioButton";
      }
    }
  };

</script>
<body>

<h1>My Radio Buttons</h1>
<div class="stylingForUnCheckedRadioButton" id="container1">
  <input id="radiobuttonId1" type="radio" value="radiobuttonId1" name="radiobutton" onclick="checkValue('container1')">
  <label for="radiobuttonId1">Radio button 1</label>
</div>

<div class="stylingForUnCheckedRadioButton" id="container2">
  <input id="radiobuttonId2" type="radio" value="radiobuttonId2" name="radiobutton" onclick="checkValue('container3')">
  <label for="radiobuttonId2">Radio button 2</label>
</div>

<div class="stylingForUnCheckedRadioButton" id="container3">
  <input id="radiobuttonId3" type="radio" value="radiobuttonId3" name="radiobutton" onclick="checkValue('container3')">
  <label for="radiobuttonId3">Radio button 3</label>
</div>
</body>
</html>

about 4 years ago · Juan Pablo Isaza

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Answer 1 · 2022-07-12T07:30:33.602Z

this way...

const all_Radios = document.querySelectorAll('#container input[type=radio]');

set_Radios()  // for page initialization

all_Radios.forEach( btRadio => btRadio.oninput = set_Radios )

function set_Radios()
  {
  all_Radios.forEach( bt => 
    bt.closest('label').classList.toggle('checkedClass', bt.checked))
  }

#container > label {
  display          : block;
  color            : black;
  background-color : white;
  border-style     : groove;
  border-width     : thin;
  border-color     : #DCDCDC;
  margin-bottom    : 7px;
  width            : 10%;
  height           : 2em;
  border-radius    : 6px;
  min-width        : 10em;
  line-height     : 2em;
  }
#container > label.checkedClass {
  color            : white;
  background-color : blue;
  border-style     : solid;
  border-color     : grey;
  }

<h1>My Radio Buttons</h1>

<div id="container">
  <label>
    <input name="radiobutton" type="radio" value="xxx" >
    Radio button 1
  </label>  
  <label>
    <input name="radiobutton" type="radio" value="yyy" >
    Radio button 2
  </label>  
  <label>
    <input name="radiobutton" type="radio" value="zzz" >
    Radio button 3
  </label>  
</div>

Answer 2 · 2022-07-12T07:30:33.610Z

I recommend to read some topics on DRY.

// All the radio buttons
const radios = document.querySelectorAll('.radio')

// Function to toggle active class
function handleRadioClick(e) {
  // Remove previous active class
  for (let i = 0; i < radios.length; i++) {
    radios[i].parentNode.classList.remove('active')
  }

  // Add current active class to parent container
  e.target.parentNode.classList.add('active')
}

// Listen for the click event on radios
for (let i = 0; i < radios.length; i++) {
  radios[i].addEventListener('click', handleRadioClick, false);
}

.container {
  color: black;
  background-color: white;
  border-style: groove;
  border-width: thin;
  border-color: #DCDCDC;
  margin-bottom: 7px;
  width: 10%;
  height: 50px;
  border-radius: 6px;
}

.container.active {
  color: white;
  background-color: blue;
  border-style: solid;
  border-width: thin;
  border-color: grey;
  margin-bottom: 7px;
  width: 10%;
  height: 50px;
  border-radius: 6px;
}

<div class="container">
  <input class="radio" id="btn1" type="radio" value="btn1" name="radio">
  <label for="btn1">Radio button 1</label>
</div>

<div class="container">
  <input class="radio" id="btn2" type="radio" value="btn2" name="radio">
  <label for="btn2">Radio button 2</label>
</div>

<div class="container">
  <input class="radio" id="btn3" type="radio" value="btn3" name="radio">
  <label for="btn3">Radio button 3</label>
</div>

Answer 3 · 2022-07-12T07:30:33.616Z

You can use the event.target to get the parentNode of the input element to set the style using classList.replace(). Each click reset the classes of the parent elements to unchecked, then if the event.target is checked e.target.checked, replace the unchecked class with the checked class.

const rbs = document.querySelectorAll('input[name = "radiobutton"]');

// callback function setSel passing in the event from the listener
function setSel(e) {
  // get parent element of the event target
  let par = e.target.parentNode
  // reset each input to unchecked before checking the event target
  rbs.forEach(item => item.parentNode.classList.replace('stylingForCheckedRadioButton', 'stylingForUnCheckedRadioButton'))
  // if the el is checked we replace the classList with  
  // the desired class that styles as checked
  e.target.checked ?
    par.classList.replace('stylingForUnCheckedRadioButton', 'stylingForCheckedRadioButton') :
    null
}

// loop over the input nodeList and add event to each node 
// in the list with a callback function 'setSel'
rbs.forEach(el => el.addEventListener('click', setSel))

.stylingForCheckedRadioButton {
  background-color: red;
}

<!DOCTYPE html>
<html>
<style>
  .stylingForCheckedRadioButton {
    color: white;
    background-color: blue;
    border-style: solid;
    border-width: thin;
    border-color: grey;
    margin-bottom: 7px;
    width: 10%;
    height: 50px;
    border-radius: 6px;
  }
  
  .stylingForUnCheckedRadioButton {
    color: black;
    background-color: white;
    border-style: groove;
    border-width: thin;
    border-color: #DCDCDC;
    margin-bottom: 7px;
    width: 10%;
    height: 50px;
    border-radius: 6px;
  }
</style>

<script type="text/javascript">
</script>

<body>

  <h1>My Radio Buttons</h1>
  <div class="container stylingForUnCheckedRadioButton" id="container1">
    <input id="radiobuttonId1" type="radio" value="radiobuttonId1" name="radiobutton">
    <label for="radiobuttonId1">Radio button 1</label>
  </div>

  <div class="container stylingForUnCheckedRadioButton" id="container2">
    <input id="radiobuttonId2" type="radio" value="radiobuttonId2" name="radiobutton">
    <label for="radiobuttonId2">Radio button 2</label>
  </div>

  <div class="container stylingForUnCheckedRadioButton" id="container3">
    <input id="radiobuttonId3" type="radio" value="radiobuttonId3" name="radiobutton">
    <label for="radiobuttonId3">Radio button 3</label>
  </div>
</body>

</html>

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changing css style with javascript

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