In Docpad, the following code (using a Query-Engine helper and eco) pulls a list of file names from a directory tree and addds their url to an array:
<% images = []; %>
<% for file in #getFilesAtPath({relativeOutDirPath: 'images/'}).toJSON() : %>
<% images.push(file.url) %>
<% end %>
How might I limit the query to a subset of files, say only PNGs?
So like stated in my answer to your other question: What methods can be called on Docpad's Query tools?
Object returned by your query has some additional default metadata you can't see. As you can see here http://docpad.org/docs/meta-data, one of the metadata is "extension". So you can query with condition like:
extension:'png'
So your code might look like (notice findAll part that gives you a possibility to set search condidtions):
<% images = []; %>
<% for file in #getFilesAtPath({relativeOutDirPath: 'images/'}).findAll(extension:'png').toJSON() : %>
<% images.push(file.url) %>
<% end %>
Or if you want to return all files and trigger different actions on different extensions you could:
<% images = []; %>
<% for file in #getFilesAtPath(relativeOutDirPath: 'images/').toJSON() : %>
<% if file.extension is 'png' : %>
<% images.push(file.url) %>
<% end %>
<% end %>
Related
I have a notices section on my website which are stored in my Mongo Database. If the collection is empty, how would i display a message to say something like "No new notices"
I am looping this on my page using EJS my code is below.
<% for (let notice of notices) {%>
<p class="lead"><%= notice.noticeText %>
<% } %>
I guess you can put a condition like so:
<% if (!notices.length) {%>
<p>desired text if no notice exists</p>
<% } else { %>
<% for (let notice of notices) {%>
<p class="lead"><%= notice.noticeText %>
<% } %>
<% } %}
I'm using Skeleton for my 16 columns grid system on Silverstripe.
My code below:
<% loop $AllChildren %>
<div class="three columns"><h5>$Title</h5></div>
<% end_loop %>
produces:
Children1 Children2 Children3 Children4 Children5
Children6 Children7 Children8 Children9 Children10
My question is how do I put a space between the rows so the output will
be like:
Children1 Children2 Children3 Children4 Children5
Children6 Children7 Children8 Children9 Children10
In SS3 you can use $MultipleOf() (api docs) in your templates to output something every nth item, e.g.
<% loop $AllChildren %>
<div class="three columns"><h5>$Title</h5></div>
<% if $MultipleOf(5) %>
<hr class="extra-space">
<% end_if %>
<% end_loop %>
I'm working on a simple Dancer app to log books a person has read, but in my template to show how many books a person has read, I'm stumbling into an error. I'm trying to go through ever row in the table of reading instances and add 1 to a counter if the reader is the same as the listed person.
Here's the code for the template:
<ul class="people">
<% IF people.size %>
<% FOREACH id IN people.keys.nsort %>
<li><h2 style="display: inline;"><% people.$id.name %></h2><br />
Born <% people.$id.birthday %><br />
<% FOREACH reader IN readings.keys.nsort %>
<% count = 0 %>
<% IF readings.$reader.person_id == people.$id.id %>
<% count = count + 1 %>
<% END %>
<% END %>
<% count %>
<% END %>
<% ELSE %>
<li><em>Unbelievable. No people here so far</em>
<% END %>
</ul>
However, when I display it, count is only 1. Does anybody know what I'm doing wrong, or do you need more code?
Thanks.
Looks like you need to pull the count initialization out of the FOREACH reader loop:
<% FOREACH id IN people.keys.nsort %>
<li><h2 style="display: inline;"><% people.$id.name %></h2><br />
Born <% people.$id.birthday %><br />
<% count = 0 %>
<% FOREACH reader IN readings.keys.nsort %>
<% IF readings.$reader.person_id == people.$id.id %>
<% count = count + 1 %>
<% END %>
<% END %>
<% count %>
<% END %>
I have a Content model which has one or many Audio files which need to be added by the new/edit form.
What I have did is created the models with this relationship:
class Audio < ActiveRecord::Base
belongs_to :content
has_attached_file :audiofile,
end
class Content < ActiveRecord::Base
...
has_many :audios
accepts_nested_attributes_for :audios, :allow_destroy => true
end
Now in my new Content form I have the following:
<% f.fields_for :audios do |audiof| -%>
<%= f.label :audiofile, 'Audio file:' %>
<%= audiof.file_field :audiofile %>
<% end -%>
What I need it to do is show me the file_field only for a new Audio file and for the existing ones just print me a file size,name and probably a delete button.
I have also created a new record in the controller with:
#content.audios.build
I am using Rails 3.0.3 with Paperclip plugin for upload. Sorry if the question is too nooby.
Thanks.
From my memory, you will be able to access to the instance of the object within the fields_for statement.
Try something like that :
<% f.fields_for :audios do |audiof| -%>
<% if audiof.object.new_record? %>
<%= f.label :audiofile, 'Audio file:' %>
<%= audiof.file_field :audiofile %>
<% else %>
<%= "Filename = #{audiof.object.audiofile.filename}" %>
<%= "url = #{audiof.object.audiofile.url}" %>
<% end %>
<% end -%>
If audiof.object returns nil(In that case, it is not the good name), check by displaying all the public methods <% = raise audiof.public_methods.inspect %>
The object method should return an instance of an Audio class.
The title contain my whole question.
<% /* Is a codeblock */ for(int i = 0;i<5;i++) { } %>
<%= "Writes something to the output stream" /* Response.Write */ %>
<%: "HTML-encodes this <b>hello</b> to the output stream" %>
For a good explanation about the <%, <%= and <%# syntax and their usage, please read this article.
The <%: syntax is new in .Net 4 and is used for encoding HTML output. See this article of ScottGu for more information about that.
<% %> is used just to execute server side code
ex. <% if(oject){...} %>
<%= %> is used execute server side code and return value
ex. <%=Html.Encode(Item["Name"]) %>
<%: %> is used execute server side code but it will return Html
Encoded string
ex. <%Item["Name"] %>
Source : What is difference between these tags <%, <%: , and <%= in ASP.NET MVC 2?