Clever Geek Handbook

For the first array x?

I guess this has a pretty simple answer

<% for user in @users %>
  <li>
    <%= link_to user.username, user %>
  </li>
<% end %>

Taking my simple example above, how would I apply the class to mine <li>

on the first three instances returned?

Second, how could I just have that the second two elements have a different class from the first? how in1..2

+2


source to share


3 answers


Or you can count manually (which is pretty ugly):

<% i = 0 %>
<% for user in @users %>
  <li class=<%= (i < 3 ? "foo" : "bar") %>>
    <%= link_to user.username, user %>
  </li>
  <% i = i.next %>
<% end %>

or use each_with_index 



<% @users.each_with_index do |user, i| %>
  <li class=<%= (i < 3 ? "foo" : "bar") %>>
    <%= link_to user.username, user %>
  </li>
<% end %>

Once you get to more complicated things than i < 3

(for example, the problem with 1..2), you should think about helper_method

(in helpers

), for example class_by_position(pos)

, so that you can write

<li class=<%= class_by_position(i) %>>
+4


source


A pseudo-selector with the first child might be a better way, but you need to have a counter variable that keeps track of the iterations to do it your own way.



+2


source


Your question is a little vague. I can't tell if you want to stop processing the array after the first x or not.

If you just want to stop after the first x elements, or are just looking for the 2nd and 3rd items, the solution is to use a slice.

Example: only the first 3:

@user[0,3].each do |user|
  ... # only executed for user = @user[0],user = @user[1] and user = @user[3]
end

Example: only the second and third:

@user[1,2].each do |user|
  ... #only only executed for user = @user[1] and user = @user[3]
end

And here is a more specific answer to your question, using these new concepts and content_tag to solve the list item class programmatically. If you're going to be doing this a lot, this is a great candidate for the function.

<% first = true %>
<% @user[0,2].each do |user| %>
  <% content_tag :li, 
     :class => first ? "class-for-first-item" : "class-for-2nd-&-3rd" do %>
    <%= link_to user.username, user %>
  <% end %>
  <% first = false %>
<% end %>
<!-- Now to do the rest of them:-->
<% @user[3,-1].each do |user| %>
  <% content_tag :li, :class => "class-for-rest" do %>
    <%= link_to user.username, user %>
  <% end %>
<% end %>
+2


source






More articles:


All Articles