Question

I have an array and I want to display only 4 items at a time and when I click on Next it will display the 4 next items.
View Code :

<table>
<tr>
  <th></th>
  <th>3</th>
  <th>2</th>
  <th>1</th>
  <th>1</th>
  <th>2</th>
  <th>3</th>
  <th></th>

</tr>
<% count = 0 %> 
<% while count < 4%>
  <tr class="match_row" value="<%=count%>">
    <th id="left_competitor"><%= @matches[count][0].title %></th>
    <% (1..6).each do |i|%>
      <th>  <input type="radio" class="group_<%=count%>" name="<%=count%>" value="<%= i%>"><br></th>
    <% end %>
    <th id="right_competitor"> <%= @matches[count][1].title %></th>
  </tr>
  <br />
  <% count += 1 %>
<% end %>
<br />
</table>
<input id="save_votes" type="button" value="Next">

Now here is the CoffeeScript code :

move_to_next_match = ->
  $("#save_votes").click -> display_next_competitors()

display_next_competitors = ->
  project_id = document.getElementById("project_id").value
  match_rows = $('.match_row')
  results = []
  for i in [0...match_rows.length]
    do (i) ->
      radios = $(".group_#{i}")
      for j in [0...radios.length]
        do (j) ->
          if radios[j].checked
            count = radios[j].getAttribute 'name'
            number = radios[j].getAttribute 'value'
            results.push("#{count} #{number}")
  data = "{\"get_matches_results\": \"#{results}-#{project_id}-#{marker}\"}"
  $.ajax({
  type: "POST"
  url: "projectss/pca_results"
  data: "data=" + data
  })
  location.reload(true);

My idea is to let the variable count in view (<%count = 0%>) take the value of a variable instead of 0 but I can’t figure out how to do this.
Any ideas ?

Answer 1

This looks like a lot of logic in your view templates, reminds me more of PHP.

Maybe you can table a look at this: http://railscasts.com/episodes/174-pagination-with-ajax

Ryan uses a Gem to handle the pagination (Lookup Kaminari or WillPaginate) and then uses unobstructive jQuery to handle the AJAX component.