Adding validations to see if radio button is not selected

Question

I have the following code:

 <li>1. question 1</li>
<li>
     <input type="radio" name="question1" id="sd1" value="1">Strongly Disagree
     <input type="radio" name="question1" id="d1" value="2">Disagree
     <input type="radio" name="question1" id="n1" value="3">Neither Agree Nor Disagree
    <input type="radio" name="question1" id="a1" value="4">Agree
     <input type="radio" name="question1" id="sa1" value="5">Strongly Agree
</li>
<br/><br/>

<li>2.  question 2 </li>
<li>
     <input type="radio" name="question2" id="sd2" value="1">Strongly Disagree
     <input type="radio" name="question2" id="d2" value="2">Disagree
     <input type="radio" name="question2" id="n2" value="3">Neither Agree Nor Disagree
    <input type="radio" name="question2" id="a2" value="4">Agree
     <input type="radio" name="question2" id="sa2" value="5">Strongly Agree
</li>
<br/><br/>

<li>3.  question 3</li>
<li>
     <input type="radio" name="question3" id="sd3" value="1">Strongly Disagree
     <input type="radio" name="question3" id="d3" value="2">Disagree
     <input type="radio" name="question3" id="n3" value="3">Neither Agree Nor Disagree
     <input type="radio" name="question3" id="a3" value="4">Agree
     <input type="radio" name="question3" id="sa3" value="5">Strongly Agree
</li>
<br/><br/>

  <input type="submit" value="Submit" name="Submit" id="Submit" />

I have such 30 questions. My requirement is that the user must answer all 30 questions.

How do I write javascript function such that a mesage is shown tot he user if he doesnt answer even one of the questions. EDIT:

The problem with my javascript i sthis:

   if ( (thisfrm.question3[0].checked == false) || (thisfrm.question3[1].checked == false) || (thisfrm.question3[2].checked == false) || (thisfrm.question3[3].checked == false) || (thisfrm.question3[4].checked == false))
{
    alert('Please answer question 1');
    return false;
}

the above code is repeated for every question without loop. i.e. it is written for each ques. but even when all ques are answered,it still displays Please answer question 1

Answer 1

This method makes use of jQuery and checks for unchecked radio buttons in a set of answers

HTML - add a class to your questions <li>

<li>1. question 1</li>
<li class="option">
     <input type="radio" name="question1" id="sd1" value="1">Strongly Disagree
     <input type="radio" name="question1" id="d1" value="2">Disagree
     <input type="radio" name="question1" id="n1" value="3">Neither Agree Nor Disagree
     <input type="radio" name="question1" id="a1" value="4">Agree
     <input type="radio" name="question1" id="sa1" value="5">Strongly Agree
</li>

Javascript

// Delegate submit action
$(document).on('submit', 'form', function () {

    var validate = true;
    var unanswered = new Array();

    // Loop through available sets
    $('.option').each(function () {
        // Question text
        var question = $(this).prev();
        // Validate
        if (!$(this).find('input').is(':checked')) {
            // Didn't validate ... dispaly alert or do something
            unanswered.push(question.text());
            question.css('color', 'red'); // Highlight unanswered question
            validate = false;
        }
    });

    if (unanswered.length > 0) {
        msg = "Please answer the following questions:\n" + unanswered.join('\n'); 
        alert(msg);
    }
    return validate;
});

Example here http://fiddle.jshell.net/6jNpQ/2/

Answer 2

Below code is more simple and clean for even biggners

if (!$("input[name='html_elements']:checked").val()) {
   alert('Nothing is checked!');
}
else {
  alert('One of the radio buttons is checked!');
}

check out this below fiddle demo

Visit http://jsfiddle.net/creators_guru/DBd79/