I'm trying to set a variable in a link.
<% #this.each do |this| %>
<%= image_tag('www.somesite.com/#{this.name}.jpg') %>
<% end %>
Basically there is an image identical to the name of the item, so i'm trying to call that in the link for the image.
But i'm missing something..
I found it works if i join them ->
<%= image_tag('www.somesite.com/' + "#{ctag.name}" '.jpg') %>
but i don't think that's a good practice ..
Interpolation doesn't work if you put your string in single quotes. Double quotes should be used instead:
<%= image_tag("www.somesite.com/#{this.name}.jpg") %>
Related
I am trying to pass a string to my view from controller like this:
controller:
def index
#str = 'foo'
end
view:
String: <% #str %>
The variable itself seems to arrive because I get no error. However, it arrives empty (only "String" is in html, nothing else). And it seems to work great with other built-in types, e.g. Time. What am I missing here? I use Ruby 2.2.1 and Rails 4.
As others have said, you need to use
<%= #str %>
I'll give you an explanation as well - you use <% %> for when you need to run some Ruby code that you don't want displayed to the screen. For example, you might have conditional logic like
<% if user_signed_in? %>
<%= #welcome_string %>
<% end %>
Use <%= %> when you want to output, drop the '=' for conditional logic or anything that doesn't need to display.
in your view
String: <%= #str %>
In view user following code:
String: <%= #str %>
In your view, use:
<%= #str %>
As the other users have pointed out, you need to use <%=
The = is an ERB flag to so export the result of the code inside of the tags and put it into the DOM.
If you want to put some logic into your page that you don't want to evaluate, you leave the = out.
<% if user_wants_to_see_output? %>
<%= "User will see this" %>
<% end %>
I was trying to refactor my erb code for rating stars into one line and came across this, is it possible to achieve the results another way?
So currently it's like this
<% rating.times do %>
<%= image_tag 'rating_star.png' %>
<% end %>
Ideally I'd like to reduce this to
<%= rating.times { image_tag 'rating_star.png' } %>
This returns the value of rating (0, 1, 2, 3, 4 or 5), if I change <%= to <% nothing is rendered. Is there any way to do this?
You can use concat:
<% rating.times { concat image_tag('rating_star.png') } %>
But <%= ... %> within a loop is cleaner IMO.
You need #map to return an array of all image_tags you wish.
Then #join the result to get a string.
Lastly, you need to tell this string is valid html with #html_safe.
<%= rating.times.map{ image_tag 'rating_star.png' }.join.html_safe %>
The difference between <% %> and <%= %> is that the former is simply evaluated, but with the latter the result is rendered. You have two things going on in your code snippet: the control part (the loop), and the rendering part (the image tag). Since you want only the image tag part rendered, you want to surround only that code with <=% %>, and the rest with <% %>.
So while this would work:
<%= rating.times { %> <%= image_tag 'rating_star.png' %> <% } %>
I find it much less readable than the 3-line version.
This is so simple but it's been ages since I needed this.
I have the following code
<% #miniature.minisets.each do |miniset| %>
<%= link_to miniset.name, miniset %>
<% end %>
It outputs Minisetname Minisetname Minisetname etc
I want it to output Minisetname, Minisetname, Minisetname with commas.
I've tried to include .join(", ") but can't find the right place to put it. Do I also need to use .map instead of .each?
Ignominy.
Here's one way that ought to work:
<%= #miniature.minisets.map { |miniset| link_to miniset.name, miniset }.join(", ").html_safe %>
Here is my code, I'm trying to display a list of links to a bboy's crews in sentence form with .to_sentence
<span class="affiliation">
<% if(#bboy.crews.count > 0)%>
<span><%= if(#bboy.crews.size > 1) then "Crew".pluralize else "Crew" end %>:</span>
<%= #bboy.crews.collect{|c| link_to c.name, c}.to_sentence %>
<% else %>
<em>Independent</em>
<% end %>
</span>
The output I get is the correct links but it displays as:
Hustle Kidz and Knuckleheads Cali
rather than:
Hustle Kidz and
Knuckleheads
Cali
with the html escaped, rather than the desired links.
Am I missing something? I've tried CGI.unescapeHTML and a few others but am getting lost...
Rails 3 now automatically escapes everything, in order to output raw HTML use this:
<%= some_string.html_safe %>
or this:
<%= raw #some_html_string %>
Thanks to macek for a hint.
For additional details: http://markconnell.co.uk/posts/2010/02/rails-3-html-escaping
You can (and should) you the raw method
<%= raw #some_html_string %>
I agree with Kleber S, you should move this into a helper, because that's a lot of logic for a view
def crews_description(crews)
if crews.empty?
content_tag('em', 'Independent')
else
label = "Crew"
label = label.pluralize if crews.size > 1
crews_links = crews.map {|crew| link_to(h(crew.name), crew)}.to_sentence
content_tag('span', label) + crews_links.html_safe
end
end
and in your view:
<span class="affiliation">
<%= crews_description(#bboy.crews)
</span>
I recommend you move this block of code to an helper and then use the .html_safe method to obtain the expected results.
I have an action in the controller:
def user_detail
#user_detail = UserDetail.find_by_id(11)
end
And in the view:
<%= #user_detail -%> // displays me like #
I am trying to retrieve the contents of #user_detail: actually the hash contains {:empid=>"11111", :prjtname=>"aaaaa", :prjtrole=>"Developer"}
How do I display the user detail's empid and other values?
Since I know what question you asked earlier, I think this is the syntax you actually want to use:
<%= #user_detail.additional_info[:empid] %>
Unless of course you renamed the name of the hash :)
Another approach, if you want all the content from the hash but the keys varies from each record, you could loop through them like this:
<% #user_detail.additional_info.each_pair do |key, value| %>
<p>Key: <%= key %> Value: <%= value %></p>
<% end %>
To get simple debug output like the example you posted, this will handle it:
<%= #user_detail.inspect %>
try this <%= #user_detail.emplid %> <%= #user_detail.prjtname %> <%= #user_detail.prjtr %>
More of an extraction from #dln's answer
try using
<%= #user_detail[:emplid] %>
<%= #user_detail[:prjtname] %>
<%= #user_detail[:prjtr] %>
Hope this solves your prob