Function used to render flextable in knitr/rmarkdown documents.

You should not call this method directly. This function is used by the knitr package to automatically display a flextable in an "R Markdown" document from a chunk. However, it is recommended to read its documentation in order to get familiar with the different options available.

HTML, Word, PowerPoint and PDF outputs are supported.

Table captioning is a flextable feature compatible with R Markdown documents. The feature is available for HTML, PDF and Word documents. Compatibility with the "bookdown" package is also ensured, including the ability to produce captions so that they can be used in cross-referencing.

# S3 method for flextable
knit_print(x, ...)



a flextable object


further arguments, not used.


Supported formats require some minimum pandoc versions:

Output formatpandoc minimal version
HTML>= 1.12
Word (docx)>= 2.0
PowerPoint (pptx)>= 2.4
PDF>= 1.12

Chunk options

Some features, often specific to an output format, are available to help you configure some global settings relatve to the table output. knitr's chunk options are to be used to change the default settings:

chunk optionpropertydefault valueHTMLdocxPDFpptx
ft.alignflextable alignment, supported values are 'left', 'center' and 'right''center'yesyesyesno
ft.shadowHTML option, disable shadow dom (set to FALSE) for pagedown.TRUEyesnonono
ft.splitWord option 'Allow row to break across pages' can be activated when TRUE.FALSEnoyesnono
ft.tabcolsepspace between the text and the left/right border of its containing cell8.0nonoyesno
ft.arraystretchheight of each row relative to its default height1.5nonoyesno
ft.leftleft coordinates in inches1.0nononoyes
ft.toptop coordinates in inches2.0nononoyes

Table caption

Captions can be defined in two ways.

The first is with the set_caption function. If it is used, the other method will be ignored. The second method is by using knitr chunk option tab.cap.

set_caption(x, caption = "my caption")

If set_caption function is not used, caption identifier will be read from knitr's chunk option or label if in a bookdown (this is to respect the bookdown standards).'my_id' or label='my_id'

Word output provide more options such as ability to choose the prefix for numbering chunk for example. The table below expose these options:

chunk optionpurposermarkdownbookdown only) style name to use for table captionsyesyes
tab.cap.pre(Word only) Prefix for numbering chunk (default to "Table")yesyes
tab.cap.sep(Word only) Suffix for numbering chunk (default to ": ")yesyes
tab.capCaption labelyesyes
tab.idCaption reference unique identifieryesno
labelCaption reference unique identifiernoyes

HTML output

HTML output is using shadow dom to encapsule the table into an isolated part of the page so that no clash happens with styles. Some output may not support this feature. To our knowledge, only the pagedown output is concerned. Use knitr chunk option ft.shadow=FALSE to disable shadow dom.

PDF output

Some features are not implemented in PDF due to technical infeasibility. These are the padding, line_spacing and height properties.

PowerPoint output

Auto-adjust Layout is not available for PowerPoint.

Also images cannot be integrated into tables with the PowerPoint format.

See also


# simple examples ----- demo_docx <- system.file(package = "flextable", "examples/rmd", "demo.Rmd") rmd_file <- tempfile(fileext = ".Rmd") file.copy(demo_docx, to = rmd_file, overwrite = TRUE)
#> [1] TRUE
rmd_file # R Markdown document used for demo
#> [1] "/tmp/Rtmpl4ubD7/file5fecdd5d0f.Rmd"
if(require("rmarkdown", quietly = TRUE)){ # knitr::opts_chunk$set(webshot = "webshot2") # render(input = rmd_file, output_format = "word_document", output_file = "doc.docx") # render(input = rmd_file, output_format = "pdf_document", output_file = "doc.pdf") # render(input = rmd_file, output_format = "html_document", output_file = "doc.html") # render(input = rmd_file, output_format = "powerpoint_presentation", output_file = "pres.pptx") # render(input = rmd_file, output_format = "slidy_presentation", output_file = "slidy.html") # render(input = rmd_file, output_format = "beamer_presentation", output_file = "beamer.pdf") # render(input = rmd_file, output_format = "pagedown::html_paged", output_file = "paged.html") }
## bookdown examples wth captions and cross ref ----- # captions_example <- system.file( # package = "flextable", # "examples/rmd", "captions_example.Rmd") # # dir_tmp <- tempfile(pattern = "dir") # dir.create(dir_tmp, showWarnings = FALSE, recursive = TRUE) # file.copy(captions_example, dir_tmp) # rmd_file <- file.path(dir_tmp, basename(captions_example)) # # file.copy(captions_example, to = rmd_file, overwrite = TRUE) # # if(require("rmarkdown", quietly = TRUE)){ # render(input = rmd_file, # output_format = word_document(), # output_file = "doc.docx") # render(input = rmd_file, # output_format = pdf_document(latex_engine = "xelatex"), # output_file = "doc.pdf") # render(input = rmd_file, # output_format = html_document(), # output_file = "doc.html") # # # bookdown ---- # if(require("bookdown", quietly = TRUE)){ # render(input = rmd_file, output_format = word_document2(), # output_file = "book.docx") # render(input = rmd_file, # output_format = pdf_document2(latex_engine = "xelatex"), # output_file = "book.pdf") # render(input = rmd_file, # output_format = html_document2(), # output_file = "book.html") # # # officedown ---- # if(require("officedown", quietly = TRUE)){ # render(input = rmd_file, # output_format = markdown_document2(base_format=rdocx_document), # output_file = "officedown.docx") # } # } # } # browseURL(dirname(rmd_file))