Pre-populating textarea adds extra newline characters

[DanielNill]

Assuming that @model.get("message") is a string with newline characters \n\r in it

%textarea.msgpost{:id => "post_#{@model.id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }= @model.get("message")

returns a textarea with double the number of newline characters originally in the string.

However

%textarea.msgpost{:id => "post_#{@model.id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }
    = @model.get("message")

does not insert extra newline characters.

Any ideas.

[netzpirat]

I made a little template for Ruby Haml:

- message = "hoho\n\rHehe"
- id = 12

%textarea.msgpost{:id => "post_#{id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }= message

%textarea.msgpost{:id => "post_#{id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }
  = message

and the output is

<textarea class='msgpost' id='post_12' maxlength='2000' name='message' placeholder='Add a comment, image or pdf...'>hoho&#x000A;Hehe</textarea>
<textarea class='msgpost' id='post_12' maxlength='2000' name='message' placeholder='Add a comment, image or pdf...'>hoho
Hehe</textarea>

So Ruby Haml does only whitespace preservation when adding the content directly to the textarea and not as child. Haml Coffee does the same:

- message = "hoho\n\rHehe"
- id = 12
%textarea.msgpost{:id => "post_#{id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }= message

%textarea.msgpost{:id => "post_#{id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }
  = message

and the output is:

<textarea class='msgpost' id='post_12' name='message' placeholder='Add a comment, image or pdf...' maxlength='2000'>hoho&#x000A;
Hehe</textarea>
<textarea class='msgpost' id='post_12' name='message' placeholder='Add a comment, image or pdf...' maxlength='2000'>hoho

Hehe</textarea>

Again, whitespace preservation is only done in the first example, so far so good, but the difference is that Ruby Haml converts CRLF (\r\n) to CR (\n), which Haml-Coffee does not. So this is a bug!

But the bug is only visible because I put the data directly within the template and with a real Backbone model the textarea preservation will not work because it's dynamic. In this case you anyway need to make use of ~:

%textarea.msgpost{:id => "post_#{id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }~ message

%textarea.msgpost{:id => "post_#{id}", :name => 'message', :placeholder => 'Add a comment, image or pdf...', :maxlength => '2000' }
  ~ message

otherwise the find a preserve helper will not be called.

Bugs to be fixed:

• Convert CRLF to CR when reading a template source.
• The preserve helper needs to delete \r
• The findAndPreserve helper needs to delete \r (HamlCoffeeAssets)

Thanks a lot for reporting.