== Inline Event Handler
Line: 8
----
<input type="checkbox"
                 onclick="
                 var f = document.getElementById('vars.field');
                 var o = f.value;
                 f.value = this.checked ? (o ? o + ',${v}' : '${v}') : o.replace(/,${v}/, '').replace(/^${v},?/, '')"
                 checked="${instance['vars'].contains(v) ? 'true' : null}"/>
----