Question

当我尝试打印由knitr生成的HTML时，打印页面会丢失所有颜色和格式。有没有办法打印HTML输出，而不会丢失格式？我尝试使用this建议的css来解决这个问题，然而，没有任何区别。

styles.css

@media print {
body {-webkit-print-color-adjust: exact;}
}

@media print {
table {-webkit-print-color-adjust: exact;}
}

MARKDOWN CODE：

---
title: "Habits"
output:
  html_document:
    css: styles.css

---

```{r, echo = FALSE}

df <- data.frame(
  id = 1:10,
  name = c("Bob", "Ashley", "James", "David", "Jenny", 
    "Hans", "Leo", "John", "Emily", "Lee"), 
  age = c(28, 27, 30, 28, 29, 29, 27, 27, 31, 30),
  grade = c("C", "A", "A", "C", "B", "B", "B", "A", "C", "C"),
  test1_score = c(8.9, 9.5, 9.6, 8.9, 9.1, 9.3, 9.3, 9.9, 8.5, 8.6),
  test2_score = c(9.1, 9.1, 9.2, 9.1, 8.9, 8.5, 9.2, 9.3, 9.1, 8.8),
  final_score = c(9, 9.3, 9.4, 9, 9, 8.9, 9.25, 9.6, 8.8, 8.7),
  registered = c(TRUE, FALSE, TRUE, FALSE, TRUE, TRUE, TRUE, FALSE, FALSE, FALSE),
  stringsAsFactors = FALSE)

```

``` {r, eval = TRUE, echo = FALSE, results='asis'}

library(formattable)

formattable(df, list(
  age = color_tile("white", "orange"),
  grade = formatter("span",
    style = x ~ ifelse(x == "A", style(color = "green", font.weight = "bold"), NA)),
  final_score = formatter("span",
    style = x ~ style(color = ifelse(rank(-x) <= 3, "green", "gray")),
    x ~ sprintf("%.2f (rank: %02d)", x, rank(-x))),
  registered = formatter("span", 
    style = x ~ style(color = ifelse(x, "green", "red")),
    x ~ icontext(ifelse(x, "ok", "remove"), ifelse(x, "Yes", "No")))
))

```

Answer 1

一个解决方案不能完全解决问题，但是允许您用颜色打印降价表，这是将formattable表导出为图像，从而使实际降价时的表是png文件类型。下面是一个可以应用于表的函数。

export_formattable <- function(f, file, width = "100%", height = NULL, 
                               background = "white", delay = 0.2,
                               width_svg=720, height_svg=740){
  w <- as.htmlwidget(f, width = width_svg, height = height_svg)
  path <- html_print(w, background = background, viewer = NULL)
  url <- paste0("file:///", gsub("\\\\", "/", normalizePath(path)))
  webshot(url,
          file = file,
          selector = ".formattable_widget",
          delay = delay)
}

将此应用于您的表格：

formattble_table <- formattable(df, list(
  age = color_tile("white", "orange"),
  grade = formatter("span",
    style = x ~ ifelse(x == "A", style(color = "green", font.weight = "bold"), NA)),
  final_score = formatter("span",
    style = x ~ style(color = ifelse(rank(-x) <= 3, "green", "gray")),
    x ~ sprintf("%.2f (rank: %02d)", x, rank(-x))),
  registered = formatter("span", 
    style = x ~ style(color = ifelse(x, "green", "red")),
    x ~ icontext(ifelse(x, "ok", "remove"), ifelse(x, "Yes", "No")))
))

export_formattable(formattble_table, "formattble_table.png")

这篇文章有助于找到导出表的解决方案：Command for exporting/saving table made with Formattable package in R。

为faaabyan欢呼-https://stackoverflow.com/users/4065921/faaabyan，以查找此导出解决方案。

有没有办法打印rmarkdown表而不会丢失颜色？

1 个答案: