javascript - Validate that ALL radio buttons are selected or NOT on button Click -

i new javascript , have javascript function called on button click. want show alert if radio buttons have not been selected wether yes or no , if have been selected call function called addpoints() below.

function validateform(){      var inputs = document.queryselectorall('input[type="radio"]');        var  formvalid = false;        for(var i=0;i<inputs.length;i++){            if(inputs[i].checked){                formvalid  = true;              }        }       if(!formvalid ){               alert("please answer questions!");        }  else{  addpoints();  } }  

below how radio buttons presented

<form name="form1" id="form1"> <input id="rdo1" type="radio" name="q1" value="10">yes<br> <input id="rdo2" type="radio" name="q1" value="0">no </form>  <form name="form2" id="form2"> <input id="rdo3" type="radio" name="q2" value="10">yes<br> <input id="rdo4" type="radio" name="q2" value="0">no </form>   <form name="form3" id="form3"> <input id="rdo5" type="radio" name="q3" value="10">yes<br> <input id="rdo6" type="radio" name="q3" value="0">no </form>  <button type="submit" onclick="validateform()">score?</button> 

if not select radio button when page loads , call function validateform() using button message correct , states "please answer questions". if select either yes or no group calls addpoints function. want call function when either yes or nos have been selected radio groups.

demo

code:

function addpoints() {     alert("adding points"); }  function validateform() {      var inputs = document.queryselectorall('input[type="radio"]'),         // empty array         checker = [];      (var = 0; < inputs.length; i++) {         if (inputs[i].checked) {             // whenever find checked element, push in checker array             checker.push(true);         }     }      // since, there 3 radio groups, according op,     // call addpoints when 3 (yes/no) have been selected     if (checker.length === 3) {         addpoints();     }     // show alert if none has been selected     else if (checker.length === 0) {         alert("please answer questions!");     } else {         // add may want     } }