{% macro onchange(js) -%}
  {%- if js is not none %} onchange="{{ js }}"{% endif -%}
{%- endmacro %}


{% macro measurement_options(selected=none) %}
  {% for meas in g.measurements.values() %}
          <option value="{{ meas.slug }}"
                  {{- _selected(meas == selected) }}>
            {{- meas.title | title -}}
          </option>
  {% endfor %}
{% endmacro %}

{% macro station_options(selected=none) %}
  {% for station in g.stations %}
          <option value="{{ station['id'] }}"
                  {{- _selected(station['id'] == selected) }}>
            {{- station['name'] -}}
          </option>
  {% endfor %}
{% endmacro %}

{% macro year_options(selected=none) %}
  {% for year in g.all_years %}
          <option value="{{ year }}" {{- _selected(year == selected) }}>
            {{- year -}}
          </option>
  {% endfor %}
{% endmacro %}

{% set options = {
  'measurement': measurement_options,
  'station': station_options,
  'year': year_options,
} %}


{% macro _selected(is_selected) %}
  {%- if is_selected %} selected{% endif -%}
{% endmacro %}