Table with dynamic content

Rails
1

I want to create a table displaying image thumbnails, 3 per row.
Can I use an if loop to create the

tags?

or is this better acheived with css?

2

On 19 May 2010 13:20, the batman [email protected] wrote:

I want to create a table displaying image thumbnails, 3 per row.
Can I use an if loop to create the tags?

“if” doesn’t produce a loop - it’s just a conditional check.

Assuming your images are stored in an array, you can use any of a
number of methods to loop them.

  • you could do .each_with_index and then start a new row on mod-3 of the
    index
  • you could use .each_slice(3) and iterate the returned array of three
  • you could (if you like it clunky) just use .each maintain your own
    counter and do your next row operations when it gets to a multiple of
    3

http://www.ruby-doc.org/core/classes/Enumerable.html

or is this better acheived with css?

Probably (for all sorts of “tables are for tabular data” reasons). But
the problem of working out how to tell the element it’s a new row will
be very similar to using a table (unless you rely on overflow wrapping
in a fixed-size container).

3
  • you could (if you like it clunky) just use .each maintain your own
    counter and do your next row operations when it gets to a multiple of
    3

I think that’s what I was trying to do, though I didn’t know how to get
a new table row
was I on the right track?

<% @photos.each do |photo| %> <% count = 0 %> <% while count <= 3 %> <% count += 1 %>

<% end %>
…

<%= link_to image_tag(photo.image.url(:thumb)), photo %>
4

Not sure that you would want to do this but you can

a = (1…20).to_a

until a.empty?
x = a.slice!(0,3)
puts x.inspect
end

Gives

[1, 2, 3]
[4, 5, 6]
[7, 8, 9]
[10, 11, 12]
[13, 14, 15]
[16, 17, 18]
[19, 20]

so you could have

<% until @photos.empty? -%> <% x = @photos.slice!(0,3) -%> <% x.each do |y| -%> <% end -%> <% end -%>
<%= y %>
5

On 19 May 2010 13:59, the batman [email protected] wrote:

  • you could (if you like it clunky) just use .each maintain your own
    counter and do your next row operations when it gets to a multiple of
    3

I think that’s what I was trying to do, though I didn’t know how to get
a new table row
was I on the right track?

I did try to hint that that was a poor option with all the Ruby
goodness available to you! :slight_smile:

Try:

<% @photos.each_slice(3) do |photos_row| %> <% photos_row.each do |photo| %> <% end %> <% # could do with some check here to pad out row with blank cells if any cell has less than three - to produce valid HTML (wouldn't need to worry about this with CSS placement :-) %> <% end %>
<%= link_to image_tag(photo.image.url(:thumb)), photo %>

You could also pass the “” drawing bit off to its own partial and
pass it the photos-row collection; but that might be one step too far
for you right now.

6

<% @photos.in_groups_of(3, false) do |group| %>

<% group.each do |photo| %> <%= photo.filename_or_whatever %> <% end %> <% end %>

or something relatively close to that