thingspeak/app/views/channels/public.html.erb

<div class="row">

  <div class="col-xs-12 col-sm-9">
    <h4 class="breadcrumb"><%= @header %></h4>
    <%= render :partial => 'list' %>
    <br>
    <%= will_paginate @channels %>
  </div>

  <div class="col-xs-12 col-sm-3">
    <h4 class="breadcrumb"><%= t(:search).capitalize %></h4>

    <div class="col-pad">
      <form role="form">
        <div class="form-group">
          <label for="tag_input"><%= t(:search_by_tag) %></label>
          <input type="text" class="form-control" id="tag_input" placeholder="<%= t(:search_input_tag) %>">
        </div>
        <button type="submit" id="search_tag" class="btn btn-primary btn-sm"><%= t(:submit) %></button>
      </form>

      <br><br>

      <form role="form">
        <div class="form-group">
          <label for="username_input"><%= t(:search_by_username) %></label>
          <input type="text" class="form-control" id="username_input" placeholder="<%= t(:search_input_username) %>">
        </div>
        <button type="submit" id="search_username" class="btn btn-primary btn-sm"><%= t(:submit) %></button>
      </form>
    </div>

  </div>

</div>

<script>
  // when the document is ready
  $(document).ready(function() {

    // when search tag is clicked
    $('#search_tag').on('click', function() {
      window.location.href = '<%= @domain %>channels/public?tag=' + encodeURIComponent($('#tag_input').val());
      return false;
    });

    // when search username is clicked
    $('#search_username').on('click', function() {
      window.location.href = '<%= @domain %>channels/public?username=' + encodeURIComponent($('#username_input').val());
      return false;
    });

  });
</script>