{% for checked, detector in  detectors %}
    <input type="checkbox"  onchange="javascript:loadCheckbox();" id="detector{{loop.index}}"
           name="detector" value="{{detector}}" {{checked}}> {{detector}}
{% endfor %}

<br>
{{message}}
{% for run_name in runs %}
    <label >{{run_name}}:</label>
    <input type="number" id="run{{loop.index}}" name="{{run_name}}" min="1" max="999999" size="4">
{% endfor %}