JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<div class="radio" id="ModelViewAd.TypeOfAd">
 <input checked="checked" id="ModelViewAd.TypeOfAd_Ad" name="ModelViewAd.TypeOfAd.SelectedValue" type="radio" value="Ad" />
 <label for="ModelViewAd.TypeOfAd_Ad">Annons</label><br>
 <input id="ModelViewAd.TypeOfAd_Auktion" name="ModelViewAd.TypeOfAd.SelectedValue" type="radio" value="Auktion" />
 <label for="ModelViewAd.TypeOfAd_Auktion">Auktion</label><br>
</div>
<div id="divEndDate">Content!</div>

JavaScript

$("#ModelViewAd\\.TypeOfAd :radio").change(function () {
    $("#divEndDate").toggle(this.checked && this.value == 'Ad');
});