I am trying to format a form and the text fields respond to some methods, and not others.
I can do things like:
f.input :name, :input_html => { :maxlength => 10 }
f.input :name, :input_html => { :disabled => true }
But if I try to do any of the following, they do not work:
f.input :name, :input_html => { :size => 10 }
f.input :name, :input_html => { :class => 'autogrow' }
f.input :name, :input_html => { :rows => 10, :cols => 10 }
When I try using :size, for instance, the generated html shows that size=10, but is not reflected in the actual form.
These were more or less pulled right from the Formtastic documentation on Github, which the Activeadmin documentation refers to.
I am not sure if your question is solved or not.
However according to Formastic Official WIKI, your code should work:
Customize HTML attributes for any input using the :input_html option. Typically this is used to disable the input, change the size of a text field, change the rows in a textarea, or even to add a special class to an input to attach special behavior like autogrow textareas:
<%= semantic_form_for @post do |f| %>
<%= f.inputs do %>
<%= f.input :title, :input_html => { :size => 10 } %>
<%= f.input :body, :input_html => { :class => 'autogrow', :rows => 10, :cols => 20, :maxlength => 10 } %>
<%= f.input :created_at, :input_html => { :disabled => true } %>
<%= f.input :updated_at, :input_html => { :readonly => true } %>
<% end %>
<%= f.actions %>
<% end %>
https://github.com/justinfrench/formtastic
if your code doesn't work , please check out the error logs, or put more debug info to your erb file, to see if you r rails is running under production mode.