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Embed

Print layout can be embedded with an iframe inside another page or modal

Getting started

When embedding print layout built-in print controls and copyrights footer are hidden and the parent container is expected to take control of printing
To use Embedded mode transfer query parameter in the URL mode=embed

Custom layout variables
Every built-in layout supports overriding Bootstrap 4 variables with its own custom values. This is especially important for the embedded print layout, since it runs inside another layout and must visually match its host — things like border radius on cards, modals, and buttons should look identical.

By calling window.print() on the iframe's contentWindow you can manually invoke print

Cross-Origin Embedding
When the parent and iframe are on different domains or subdomains (e.g. app.example.com and print.example.com ), browsers block direct access to the iframe's contentWindow for security reasons. In this case, use postMessage to communicate between the parent and the iframe instead of calling contentWindow.print() directly.
Print from parent container

When embedding in a modal:

  • Remove the default modal body padding by adding .p-0 to .modal-body
  • Set a minimum height on .modal-body using .min-vh-sm-50 , .min-vh-sm-75 , etc.
  • Apply the following utility classes to the iframe: .d-block .border-0 .w-100 .h-100
Lazy Loading

Instead of setting the iframe's src immediately, lazy load it the first time the modal opens. This avoids an unnecessary network request if the user never opens the print dialog.

Use Bootstrap's show.bs.modal event with .one() to load the iframe only once on first open.

See the example below for implementation. 

.row
  .col-24.col-sm-auto
    =button_tag 'print modal', class: 'btn btn-light', 'data-toggle': "modal", 'data-target': "#modal-print", type: 'button'
  .col-24.col-sm-auto.mt-2.mt-sm-0
    =button_tag 'print modal lg', class: 'btn btn-light', 'data-toggle': "modal", 'data-modal-dialog-class': 'modal-lg', 'data-target': "#modal-print", type: 'button'
  .col-24.col-sm-auto.mt-2.mt-sm-0
    =button_tag 'print modal xl', class: 'btn btn-light', 'data-toggle': "modal", 'data-modal-dialog-class': 'modal-xl', 'data-target': "#modal-print", type: 'button'
  .col-24.col-sm-auto.mt-2.mt-sm-0
    =button_tag 'print modal full screen', class: 'btn btn-light', 'data-toggle': "modal", 'data-modal-dialog-class': 'modal-fs', 'data-target': "#modal-print", type: 'button'

.modal#modal-print{tabindex: '-1'}
  .modal-dialog
    .modal-content
      .modal-header
        %h5.modal-title='Full screen modal'
        =button_tag class: 'close', 'data-dismiss': 'modal', type: 'button' do
          %span ×
      .modal-body.p-0.min-vh-sm-50
        %iframe.d-block.border-0.h-100.w-100{'data-src': print_path(ignore_environment_header: true, mode: 'embedded')}
      .modal-footer
        =button_tag 'cancel', type: 'button', class: 'btn btn-link', 'data-dismiss': "modal"
        =link_to 'javascript: $("#modal-print iframe")[0].contentWindow.print();', class: 'btn btn-primary' do
          %i.far.fa-fw.fa-print
          Print

:javascript
  $('#modal-print').one('show.bs.modal', function (e) {
    let iframe = $(e.target).find('iframe[data-src]'); // first time modal is shown
    iframe.attr('src', iframe.data('src'));
  })
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