<form role="form" data-request="onTest" data-request-update="calcresult: '#result'">
    <input type="text" value="15" name="value1">

    <label><input type="radio" name="operation" value="+"> +</label>
    <label><input type="radio" name="operation" value="-"> -</label>
    <label><input type="radio" name="operation" value="*" checked> *</label>
    <label><input type="radio" name="operation" value="/"> /</label>

    <input type="text" value="5" name="value2">
    <button type="submit">=</button>
</form>

<!-- The result -->
<div id="result">{% partial "calcresult" %}"</div>