Hi, I am a very beginner on Ruby and related stuff, Could you please
tell me
what a tag like this "<%!" means in the following code. Also, I would
really appreciate if you can give me some ref to erb templates.
<%! if filmstrip_image_path.blank? %>
Also what does this '?' do in the above code
Thanks,
Georgy
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Hi, I am a very beginner on Ruby and related stuff, Could you please
tell me
what a tag like this "<%!" means in the following code. Also, I would
really appreciate if you can give me some ref to erb templates.
The official documentation can be found here:
or use `ri ERB' in the command line.
<%! if filmstrip_image_path.blank? %>
Also what does this '?' do in the above code
It's just part of the method name `blank?'.
By convention, methods with a name ending with
a question mark return a boolean value, false or true.
okay what about the '!' in <%! if filmstrip_image_path.blank? %>
unknown wrote in post #1081937:
Am 30.10.2012 05:59, schrieb Georgy Daniel:
Hi, I am a very beginner on Ruby and related stuff, Could you please
tell me
what a tag like this "<%!" means in the following code. Also, I would
really appreciate if you can give me some ref to erb templates.The official documentation can be found here:
Class: ERB (Ruby 1.9.3)or use `ri ERB' in the command line.
<%! if filmstrip_image_path.blank? %>
Also what does this '?' do in the above code
It's just part of the method name `blank?'.
By convention, methods with a name ending with
a question mark return a boolean value, false or true.
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Sorry, no clue. It doesn't seem to be a part of erb.
I guess it should be parsed as a boolean `not'.
But to see whether that makes sense here, you would have
to provide more of the surrounding code, especially the
rest of the if statement.
Am 30.10.2012 10:33, schrieb Georgy Daniel:
okay what about the '!' in <%! if filmstrip_image_path.blank? %>
I don't think it is associated with the if condition, here there is
another instance of the '!'
<%!
require 'cgi'
require 'json'
.....................
.....................
%>
Also here is the if condition block
<%! if filmstrip_image_path.blank? %>
<div id="main-page">
<img src="resources/image.jpg" alt="My Image"></img>
<img id="main-page-text" src="resources/image.png"></img>
</div>
<%! end %>
unknown wrote in post #1081950:
Am 30.10.2012 10:33, schrieb Georgy Daniel:
okay what about the '!' in <%! if filmstrip_image_path.blank? %>
Sorry, no clue. It doesn't seem to be a part of erb.
I guess it should be parsed as a boolean `not'.
But to see whether that makes sense here, you would have
to provide more of the surrounding code, especially the
rest of the if statement.
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And this code works? Are you really using the standard erb?
For me (ruby 1.9.3p194), the following template gives a syntax error
<%! if true %>
true
<%! end %>
Because this is interpreted as
! if true
...
! end
where the first '!' is possible but completely useless here,
and the second '!' is syntactically wrong.
The fact that <%! has no special meaning but is treated
like <% and the boolean `!' can be seen here:
require 'erb'
template = <<EOF
<%! false && (text = 'true!!!') %>
<%= text %>
EOF
puts ERB.new(template).result
outputs `true!!!', because the ruby code is taken to be
!false && (text = 'true!!!')
and the assignment of `true!!!' to the variable takes place.
The same with <%! true && ... %> gives no output, as expected.
Am 30.10.2012 13:10, schrieb Georgy Daniel:
I don't think it is associated with the if condition, here there is
another instance of the '!'<%!
require 'cgi'
require 'json'
.....................
%>Also here is the if condition block
<%! if filmstrip_image_path.blank? %>
<div id="main-page">
<img src="resources/image.jpg" alt="My Image"></img>
<img id="main-page-text" src="resources/image.png"></img>
</div>
<%! end %>
Thanks you, I really appreciate your help on this.
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