Conditional class in HAML

Question

I have this html

  <tr <% if ap.overdue? %>class = "overdue"<% end %> >
    <td><%= ap.id %></td>
    <td><%= link_to ap.affiliate.title, superadmin_affiliate_path(ap.affiliate) %></td>
  </tr>

How do I code the equivalent in HAML? In particular the first line, which assigns a class only if the if condition is true.

http://html2haml.heroku.com/ you can use this website very helpful — matanco, May 28 '14 at 10:47
Possible duplicate of [Append class if condition is true in Haml](https://stackoverflow.com/questions/3453560/append-class-if-condition-is-true-in-haml) — Ian Hunter, Nov 14 '18 at 19:35

Rajdeep Singh · Accepted Answer · 2014-05-28T10:13:09.367

30

Try this

%tr{ :class => ("overdue" if ap.overdue?) }

edited May 28 '14 at 10:13

answered May 28 '14 at 10:08

Rajdeep Singh

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If you have classes that you always need and one or more variable classes, you can either use a variable (i.e. class: @some_var) or string interpolation with a ternary (i.e. class: "some-class #{ap.overdue? ? "overdue" : ""}") – Chris Hanson Nov 06 '14 at 16:59

score 4 · Answer 2 · answered Jun 10 '15 at 17:37

4

HAML has a nice built in way to handle this:

%tr{ class: [ap.overdue? && 'overdue'] }

The way that this works is that the conditional gets evaluated and if true, the string gets included in the classes, if not it won't be included.

answered Jun 10 '15 at 17:37

Jared

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Conditional class in HAML

2 Answers2