在"asis" Markdown块中初始化JS渲染器的推荐方法 [英] Recommended way to initialize JS renderer in 'asis' Markdown chunck

问题描述

'asis'块对于在Markdown文档中输出对象列表非常有用，请参见以下示例: Highcharter ， DT ，传单，...

但是，在上述示例中，如果在上一个块中未调用渲染器一次，则对象列表将不会打印，因此将其初始化:这是一个棘手的解决方法，而我找到解决方案的更多原因是尝试/错误，而不是在文档中找到它.

这是一个可复制的问题，也发布在 https://github.com/rstudio/rmarkdown /issues/1877 :

---
title: "Test"
output:
  html_document
---



```{r,echo=F}
library(DT)
library(rmarkdown)
library(purrr)
library(knitr)

df_list <- list("cars" = mtcars, "flowers" = iris)

knitr::opts_chunk$set(echo = FALSE, warning = FALSE, message = FALSE)
```

```{r}
# If this first initialization isn't run, tabs won't print
DT::datatable(data.frame())
```

# Test tabs {.tabset}

```{r, results='asis' }
imap(df_list, ~{
  cat('## Subtab ',.y,'\n')
  cat('\n')
  DT::datatable(.x) %>%
    htmltools::tagList() %>% as.character() %>% cat() })

```
 

  

解决方案

@cderv给出了我的问题的答案:
https://github.com/rstudio/rmarkdown/issues/1877#issuecomment- 679864674

结果='asis'现在更多记录在 https://bookdown.org/yihui/rmarkdown-cookbook/results-asis.html#results-asis .它旨在从R块生成原始的mardown内容.任何事情都必须导致文本输出，这隐含地意味着这些块中的任何R对象都不会真正发生编织魔术，因为在编织内容时，knitr不会进行调整(因为它突出了文本)

我想我不会使用result ='asis'来cat()一个复杂的R对象，例如htmlwidget.您找到了一种解决方法，但可能会遇到其他问题.

由于@yihui喜欢此答案，因此暗示使用htmlwidget上的cat + asis应自担风险.

但是，我将继续使用问题中提到的解决方法，因为只要可行，我就会发现它非常实用.

感谢@atusi& @cderv的宝贵意见.

'asis' chuncks are very useful to output a list of objects in a Markdown document, see following examples : Highcharter, DT, Leaflet, ...

However, in the above examples, the list of object won't print if the renderer hasn't been called once in a previous chunck, so that it gets initialized : this is a tricky workaround, and I found the solution more by trial / error than by finding it in documentation.

This is a reproducible issue also posted on https://github.com/rstudio/rmarkdown/issues/1877 :

---
title: "Test"
output:
  html_document
---



```{r,echo=F}
library(DT)
library(rmarkdown)
library(purrr)
library(knitr)

df_list <- list("cars" = mtcars, "flowers" = iris)

knitr::opts_chunk$set(echo = FALSE, warning = FALSE, message = FALSE)
```

```{r}
# If this first initialization isn't run, tabs won't print
DT::datatable(data.frame())
```

# Test tabs {.tabset}

```{r, results='asis' }
imap(df_list, ~{
  cat('## Subtab ',.y,'\n')
  cat('\n')
  DT::datatable(.x) %>%
    htmltools::tagList() %>% as.character() %>% cat() })

```
 

  

解决方案

The answer to my question has been given by @cderv :
https://github.com/rstudio/rmarkdown/issues/1877#issuecomment-679864674

The results = 'asis' is now more documented in https://bookdown.org/yihui/rmarkdown-cookbook/results-asis.html#results-asis . It is aimed at generating raw mardown content from a R chunk. Anything must result in a text output, and implicitly that means no knitr magic really happens for any R object in those chunk, because knitr does no adjustment when knit_printing the content (as it is juts text)

I think I would not use result = 'asis' to cat() a complex R object like an htmlwidget. You found a workaround but you may encounter other issues.

As this answer has been liked by @yihui, it gives a hint that cat + asis on htmlwidget should be used at one's own risk.

However, I'll personnaly continue to use the workarounds mentioned in the question, because as long as it works I find it very practical.

Thanks @atusi & @cderv for their valuable input.

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