layout with variable from the stash #1801

Haf-Linger · 2021-06-16T13:00:36Z

Haf-Linger
Jun 16, 2021

I am trying to set the refresh rate of a status page using a stash variable
So I have the following code in the controller to render the page:

my $refreshrate = 10;
$self->stash( refreshrate => $refreshrate);
$self->render();

in the html template I have:

% layout 'refreshLayout', title => 'A title';
% content_for refresh => begin
	<meta http-equiv="refresh" content="<%= $refreshrate %>"/>
% end
<div>....body content .../<div>

and in the layout template I have:

<!DOCTYPE html>
<html>
  <head>
	<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"/>
       <meta charset="UTF-8"/>
	<%= content 'refresh' %>
        .....
 </head>
  <body><%= content %></body>
</html>

I always end up with a page rendered with no value in the content attribute of the refresh meta tag, but the meta tag will be there. So that when I replace in the template of the page the "<%= $refreshrate %> with a fixed value like '10' then all is OK.

So what am I doing wrong here?
And while we are here, why in the layout template do we do use <%= content %> (and not $content)
While in the template of the regular page we use the more logical <%= $variable %>
How does the replacement work in the layout template versus the replacement in the template of the main page?

Answered by rage311

Jun 22, 2021

This seems to work as expected:

#!/usr/bin/env perl

use 5.034;
use Mojolicious::Lite -strict, -signatures;

get '/' => sub ($c) { $c->stash(refreshrate => 10) } => 'index';

app->start;

__DATA__

@@ index.html.ep
% layout 'refreshLayout', title => 'A title';
% content_for refresh => begin
  <meta http-equiv="refresh" content="<%= $refreshrate %>"/>
% end
<div>....body content ...</div>

@@ layouts/refreshLayout.html.ep
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"/>
    <meta charset="UTF-8"/>
    <%= content 'refresh' %>
  </head>
  <body><%= content %></body>
</html>

Generates the HTML content:

View full answer

Haf-Linger · 2021-06-22T14:14:49Z

Haf-Linger
Jun 22, 2021
Author

Hmm, no answer so far. Maybe its me...?
Any suggestion on how to better phrase this question so that I do get an answer?

0 replies

rage311 · 2021-06-22T15:50:39Z

rage311
Jun 22, 2021

This seems to work as expected:

#!/usr/bin/env perl

use 5.034;
use Mojolicious::Lite -strict, -signatures;

get '/' => sub ($c) { $c->stash(refreshrate => 10) } => 'index';

app->start;

__DATA__

@@ index.html.ep
% layout 'refreshLayout', title => 'A title';
% content_for refresh => begin
  <meta http-equiv="refresh" content="<%= $refreshrate %>"/>
% end
<div>....body content ...</div>

@@ layouts/refreshLayout.html.ep
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"/>
    <meta charset="UTF-8"/>
    <%= content 'refresh' %>
  </head>
  <body><%= content %></body>
</html>

Generates the HTML content:

<!DOCTYPE html>
<html>
  <head>
	<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0"/>
       <meta charset="UTF-8"/>
		<meta http-equiv="refresh" content="10"/>

 </head>
  <body><div>....body content ...</div>
</body>
</html>

1 reply

Haf-Linger Jun 23, 2021
Author

@rage311
Thank you for your answer.
I can confirm that things work the way they should and I was able to find my real problem.

It seems to me that you can not use the same key names in the $app->defaults hash as in your $app->config hash.
I had the key refreshrate sitting in my config file in order to set the initial refreshrate.
At startup I moved this value from the config hash to the defaults hash (as I wanted it to be modifiable and I do not like to change the values that sit in the config hash).
So in reality my controller code looked like:

my $refreshrate = $self->defaults->{'refreshrate'};
$self->stash( refreshrate => $refreshrate);
$self->render();

turns out that if you do that, the stash will have a key refreshrate in the config part of the stash.
but there will be no key called refreshrate in the rest of the stash.
as soon as you change the name in the defaults hash to something different like refresh things work OK.
So changing your setup and your controller code to:

my $refreshrate = $self->defaults->{'refresh'};
$self->stash( refreshrate => $refreshrate);
$self->render();

Am I dreaming?
And if not, is it behaviour intentional or a bug?

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