How to send back js.haml in rails

Question

I have a rails create action which send back some jquery in a file:

create.js.erb

var appearance = $("<%= escape_javascript(render(:partial => @appearance)) %>").effect("highlight", {color: '#E6ff00'}, 2000);
$("#sortable").append(appearance);
$("#new_appearance")[0].reset();

I have started using HAML and want to know how I should be converting this. Can I use js.haml? If so what should the markup look like?

Answer 1

Well looks like you dont need the != in front of each line. The following works for me just fine. Im using Rails 3 and latest version of HAML

$('#comments_table_header').after('#{escape_javascript(render :partial => 'row', :locals => { :comment => @comment })}');

Answer 2

Haml's really meant to generate HTML. You could, in theory, use create.js.haml, but ERB makes much more sense when you're writing Javascript.

Answer 3

Actually, returning JS in HAML is pretty easy, just use the :plain filter and enclose anything you want evaluated in #{}.

:plain
  var appearance = $("#{escape_javascript(render(:partial => @appearance)}").effect("highlight", {color: '#E6ff00'}, 2000);
  $("#sortable").append(appearance);
  $("#new_appearance")[0].reset();

Do not use the :javascript filter as it will enclose everything in a tag which is unnecessary.

If you need to use some logic, just put the :plain inside the nesting.

- if params[:printing]
  :plain
    $('#print-view').html("#{escape_javascript(render 'print_preview')}");

Sorry ERB.

Answer 4

In a js.haml it would look something like

!= "var appearance = $('<%= escape_javascript(render(:partial => @appearance)) %>').effect('highlight', {color: '#E6ff00'}, 2000);"
!= "$('#sortable').append(appearance);"
!= "$('#new_appearance')[0].reset();"

Note the HAML != syntax which prevents the generated text from being HTML escaped. I do agree that ERB is a better fit here, but for consistency stake you might still want to go the HAML way.