ShuJuQiu: wicked

采用wicked_pdf产生PDF文档

Gemfile

gem 'wicked_pdf'
gem 'wkhtmltopdf-binary'
#gem 'wkhtmltopdf-binary-edge' # fork of wkhtmltopdf-binary，不需要

install libxrender1
- Error, error while loading shared libraries: libXrender.so.1
- Solution: Need to install sudo apt-get install libxrender1
in config/initializers/mime_types.rb
```
Mime::Type.register "application/pdf", :pdf 
```
- Optional? PDF may be builtin for new version.

define template in app/views/layouts/pdf.html.erb

    <!doctype html>
    <html>
    <head>
        <meta charset='utf-8' />
        <%= javascript_include_tag "https://code.jquery.com/jquery-3.3.1.slim.min.js" %>
        <%= javascript_include_tag "http://code.jquery.com/ui/1.10.3/jquery-ui.min.js" %>
        <%= javascript_include_tag "https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" %>
        <%= javascript_include_tag "https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" %>
    </head>
    <body onload='number_pages'>
        <div id="header">
        </div>
        <div id="content">
        <%= yield %>
        </div>
    </body>
    </html>

NOTE: In the official guide, you can include local css/js, but you need to define it and pre-compile it for production. Otherwise, the missing assets could be OK in development but failed in production

    <%= wicked_pdf_stylesheet_link_tag "pdf" -%>
    <%= wicked_pdf_javascript_include_tag "number_pages" %>

although include jquery & bootstrap cdn in pdf.html.erb, but seems not work.

specify template
- define default template in config/initlializers/wicked_pdf.rb
```
   layout: 'pdf.html'
```
- specify in page view when using it.

Use it in controllers

in  app/controller/records_controller.rb
  format.pdf do
    render pdf: "records",
    template: "records/index.html.erb"
#        layout: "pdf.html"
  end

You could customized layout template here.

If you use assets, pre-compile it for production. in config/initializers/assets.rb. e.g.

Rails.application.config.assets.precompile += ['blueprint/screen.css', 'pdf.css', 'jquery.ui.datepicker.js', 'pdf.js']

Not used and tested yet.

Chinese character problem.
- set UTF8 in layout <meta charset='utf-8' />
- install font: sudo apt-get install fonts-wqy-zenhei