Very new to php, but like the challenge. I have a Yes & No radio button config. I would like a dialog box to open if the "no" radio button is selected. Below is the "No"" radio button code. I have searched for quite awhile and have some examples, but can't get them to function. 

 <div class="form-check">
                <div class="col-3 pr-0 text-float-right">
                    <input class="form-check-input" type="radio" name="HLdefault" id="HL_defaultno" value="hl2">
                       

                <label class="form-check-label font-weight-bold text-danger" for="HL_defaultno">No</label>
            </div>
        </div>

Any help would be greatly appreciated!

    Figures I find something that solves my first problem right after I post! So now the alert opens on the "no" selection of the radio button. In that dialog box, I would like to build an "if and then" statement. Yes opens another html page, no captures the "no" value and close the dialog box.
    Here is the script I found and inserted.

    <div class="form-check">
                <div class="col-3 pr-0 text-float-right">
                    <input class="form-check-input" type="radio" name="HLdefault" id="HL_defaultno"
                        onclick="showMessage()" value="hl2">

                <label class="form-check-label font-weight-bold text-danger" for="HL_defaultno">No</label>
            </div>
            <script>
            function showMessage() {
                // Example displaying an alert
                alert("Would you like to create an Issue?")
            }
            </script>
        </div>

      You could have your function check to see if it's selected or not, and use that to determine if you do anything, e.g.:

      <!DOCTYPE html>
<head>
  <title>test</title>
  <script>
    function check_it(element) {
      if(element.checked) {
        alert("You selected it.");
      }
    }
  </script>
</head>
<body>
  <form>
    <p><label><input type='checkbox' name="foo" onchange="check_it(this);"> click me</label></p>
  </form>
</body>
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