问题
I know there are a lot of issues with wkhtmltopdf and page breaks that date back years, but I haven't worked out a solution yet. I'm using the PDFKit gem to generate my html pages into pdfs, but I don't want the pages to break in the middle of a table row.
I'm using wkhtmltopdf-binary (0.9.9.3), which looks to be the most updated version
My CSS:
@media print {
#scores table tr td, #scores table tr th {
page-break-inside: avoid !important;
}
table, tr, td, th, tbody, thead, tfoot {
page-break-inside: avoid !important;
}
}
My table:
<div class="score_table">
<table id="scores" class="print-friendly">
<tbody>
<% @chapters.each do |chapter| %>
<tr>
<th colspan="3" ><%= chapter.name %></th>
</tr>
<% chapter.rules.each do |rule| %>
<tr>
<th colspan="2" >Rule: <%= rule.name %></th>
<th></th>
</tr>
<!-- Triggers -->
<% rule.triggers.each do |trigger| %>
<tr>
<td>T</td>
<td><%= markdown(trigger.body) %></td>
<td><%= markdown(trigger.explanation) %></td>
</tr>
<% if trigger.image? || trigger.image2? %>
<tr>
<td></td>
<% if trigger.image? %>
<td><%= image_tag trigger.image.url(:thumb) %></td>
<% else %>
<td></td>
<% end %>
<% if trigger.image2? %>
<td><%= image_tag trigger.image2.url(:thumb) %></td>
<% else %>
<td></td>
<% end %>
</tr>
<% end %>
<% end %>
<!-- Questions -->
<% rule.questions.each do |question| %>
<tr>
<td>Q</td>
<td><%= markdown(question.body) %></td>
<td><%= markdown(question.answer) %></td>
</tr>
<% if question.image? || question.image2? %>
<tr>
<td></td>
<% if question.image? %>
<td><%= image_tag question.image.url(:thumb) %></td>
<% else %>
<td></td>
<% end %>
<% if question.image2? %>
<td><%= image_tag question.image2.url(:thumb) %></td>
<% else %>
<td></td>
<% end %>
</tr>
<% end %>
<% end %>
<!-- Hints -->
<% rule.hints.each do |hint| %>
<tr>
<td>H</td>
<td><%= markdown(hint.body) %></td>
<td><%= markdown(hint.explanation) %></td>
</tr>
<% if hint.image? || hint.image2? %>
<tr>
<td></td>
<% if hint.image? %>
<td><%= image_tag hint.image.url(:thumb) %></td>
<% else %>
<td></td>
<% end %>
<% if hint.image2? %>
<td><%= image_tag hint.image2.url(:thumb) %></td>
<% else %>
<td></td>
<% end %>
</tr>
<% end %>
<% end %>
<% end %>
<% end %>
</tbody>
</table>
</div>
Is there a work around, or is there something that I'm doing wrong? This is the result:
I could post the PDFKit code as well, but it sounds like a wkhtmltopdf issue
***Update - My CSS @print isn't affecting the page when .pdf is added to the url. I have my stylesheet link with media: "all"
<%= stylesheet_link_tag "application", media: "all", "data-turbolinks-track" => true %>
Here's my initializer pdfkit.rb:
ActionController::Base.asset_host = Proc.new { |source, request|
if request.env["REQUEST_PATH"].include? ".pdf"
"file://#{Rails.root.join('public')}"
else
"#{request.protocol}#{request.host_with_port}"
end
}
If I can fix the CSS, then I probably will solve the page break issue!
回答1:
i added this in css it worked for me
@media print {
#scores {
page-break-before: always;
}
}
回答2:
I am using version wkhtmltopdf 0.12.0
For me, page breaks ONLY work with --print-media-type. Without it, page break protection for images works, but not page-break-after or before.
I had to make a special css file for print media to get it work.
Setting the paper size to 'A3' or using the 'overflow: visible' didn't make any difference.
I ended up with the following:
in config/initializers:
PDFKit.configure do |config|
config.wkhtmltopdf = '/usr/bin/wkhtmltopdf'
config.default_options = {
:encoding=>"UTF-8",
:page_size => 'A3',
:zoom => 0.9,
:javascript_delay => 2000,
:print_media_type => true,
:footer_right => 'report, page [page] of [toPage]',
:no_background => true,
}
end
I am not 100% sure if the no_background is needed.
Then, in the controller:
def report_as_pdf
require 'nokogiri'
root_url = Rails.env.development? ? 'http://localhost:3000' : 'https://my.example.com'
html = render_to_string(layout: true, template: "reports/report_as_pdf").gsub('/assets', root_url + '/assets') # since wkhtmltopdf can not find the css files, we add the root_url to all assets
html_doc = Nokogiri::HTML(html)
html_doc.css('div.contain-to-grid').remove
html_doc.css('nav#rapportage_bar').remove
# Had to remove certain elements on the page. Not relevant for this particular problem, but it may help.
html = html_doc.to_html
filename = 'report_' + Time.now.to_s(:db)[0..9]
if Rails.env.development?
File.write("/tmp/#{filename}.html", html)
render :text => "wrote /tmp/#{filename}.html"
fork do
system("wkhtmltopdf --footer-right 'report, page [page] of [toPage]' --page-size 'A3' --zoom 0.9 --javascript-delay 2000 --no-background --print-media-type file:////tmp/#{filename}.html /tmp/#{filename}.pdf")
end
# forking was the only way I could get it to work in development mode, using thin as webserver instead of webrick (but it might work with webrick, I didn't try).
else
kit = PDFKit.new(html)
send_data(kit.to_pdf, :filename => filename + '.pdf', :type => 'application/pdf')
# all is simpeler in production mode.
end
end
Note, that in the default layout (normally app/views/layouts/application.html.erb) I added one line to introduce a special css file for print:
stylesheet_link_tag "application_print", media: "print"
This file actually imports some tables from ZURB Foundation, which is cool.
@import "foundation/components/tables";
h1 {
font-variant: small-caps;
font-weight: bolder;
font-size: 320%;
border-bottom: 12px solid black;
margin-bottom: 20px;
margin-top: 80px;
}
h2 { (etc etc etc)
To make page breaks in a view, I just insert this in the right places:
I hope this will be useful to someone someday.
回答3:
Can you upload the controller code where you've called PDFkit.new ?
Your stylesheet might not be included. Try adding the stylesheet in your controller code like this:
def export
kit = PDFKit.new(render_to_string(layout: false, handlers: [:haml], formats: :html, template: 'score_tables/export'))
kit.stylesheets << "#{Rails.root}/vendor/assets/stylesheets/bootstrap.css"
kit.stylesheets << "#{Rails.root}/app/assets/stylesheets/score_tables.css"
kit
end
回答4:
Here is how I fixed my issue.
- Updated PDFKIT to as of ( 01/22/2014 )
- I had to move my table out of the <div> as the nested table messes everything up.
Example:
No div tag wrapping the table.
From
<div class="score_table">
<table id="scores" class="print-friendly">
...rest of the HTML
To
<table id="scores" class="print-friendly">
...rest of the HTML
Hope this helps.
来源：https://stackoverflow.com/questions/27193481/wkhtmltopdf-with-pdfkit-on-rails-ignoring-table-page-breaks