_percentage_form.html.eex

<%
  action = if is_nil(@gate), do: "Add", else: "Update"
%>
<span>
  <form id="fwf-new-group-form" action="<%= path(@conn, "/flags/#{url_safe(@flag.name)}/percentage") %>" method="post" class="form-inline">
    <input type="hidden" name="_csrf_token" value="<%= @conn.assigns[:csrf_token] %>">
    <%= if assigns[:error_message] do %>
      <div class="input-group mr-2 has-danger fwf-wide-input">
        <div class="input-group-addon">percentage</div>
        <div class="input-group-addon"><code>0 < x < 1</code></div>
        <input type="number" step="0.000000001" class="form-control form-control-danger" id="percent_value" name="percent_value" placeholder="e.g. 0.421337 for 42.1337%">
      </div>
    <% else %>
      <div class="input-group mr-2 fwf-wide-input">
        <div class="input-group-addon">%</div>
        <div class="input-group-addon"><code>0 < x < 1</code></div>
        <input type="number" step="0.000000001" class="form-control" id="percent_value" name="percent_value" placeholder="e.g. 0.421337 for 42.1337%">
      </div>
    <% end %>

    <div class="form-check form-check-inline">
      <label class="form-check-label">
        <input class="form-check-input" type="radio" name="percent_type" id="radio-percent-type-time" value="time" checked>
        <span class="badge badge-default">% of time</span>
      </label>
    </div>
    <div class="form-check form-check-inline">
      <label class="form-check-label">
        <input class="form-check-input" type="radio" name="percent_type" id="radio-percent-type-actors" value="actors">
        <span class="badge badge-default">% of actors</span>
      </label>
    </div>

    <button type="submit" class="btn btn-sm btn-primary ml-3"><%= action %></button>
    <small class="form-text text-danger ml-3"><%= assigns[:error_message] %></small>
  </form>
</span>