JAVASCRIPT

how to know which radio button is selected javascript

//html
        <input type="radio" name="someName" value="value1">
        <label>value1</label>
        <input type="radio" name="someName" value="value2">
        <label>value2</label>
//js
const radioButtons = document.querySelectorAll('input[name="someName"]');
var selectedRadioButton;
for (const radioButton of radioButtons) {
  if (radioButton.checked) {
    selectedRadioButton = radioButton.value;
    break;
  }
}
//now you have the value selected in selectedRadioButton

javascript is radio button checked

//get radio Buttons (other ways to do this too)
let radioButtons = document.querySelectorAll("input[name=myRadioName]");

//annoyingly the "change" event only fires when a radio button is clicked
//so it does not fire when another one is clicked and it gets unchecked
//so you have to put change listener  on all radio buttons
//and then detect which one is actually selected
for (let i = 0; i < radioButtons.length; i++) {
  	radioButtons[i].addEventListener('change', function() {
  		if (radioButtons[i].checked == 1){
        	alert("checked") ;
    	} else {
    		alert("not checked")
    	}
    });
}

//html look like this:
<form name="myFormName">
  <input type="radio" name="myRadioName"  value="1" />
  <input type="radio" name="myRadioName"  value="2" />
  <input type="radio" name="myRadioName"  value="3" />
</form>