Knockout + Bootstrap Radio Buttons with KO Validation Example

index.html

<label class="ov-label">Options</label>
<div data-bind="foreach: optionList, validationOptions: {insertMessages: false}">
    <div class="radio">
        <label>
            <input data-bind="checked: $parent.selectedOptionId, value: id" type="radio" name="optionGroup">
            <!-- ko text: name --><!--/ko-->
        </label>
    </div>
</div>

<span class="validationMessage" data-bind="validationMessage: selectedOptionId"></span>