Inspired by this answer, I would like to use for example this dataframe in R
input <- data.frame(text = c("a", "b", "c"),
page_number = c(3, 5, 6))
to create a list out of the text, which links to the different page_numbers. The solution describes how to use JavaScript in Markdown but unfortunately not how to use it within code chunks (which is necessary to dynamically create a list).
Sorry I can't comment but do you want the javascript chunks? if so, does this help you?
First
install.package(knitr)
Then in your R Markdown file :
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
library(knitr)
```
and
```{js}
some javascript code in here
```
The easiest way is to use results='asis' on a code block which creates your desired raw string. You can wrap it into a raw HTML block to make sure that it's not read as Markdown but treated as HTML.
~~~{=html}
```{r, echo=FALSE, results='asis'}
input <- data.frame(text = c("a", "b", "c"),
page_number = c(3, 5, 6))
links <- paste('<a href="', input$text, '">', input$page_number, "</a>", sep="")
cat(links, sep = "\n")
```
~~~
I like to use the htmltools package for this kind of job.
You can create a HTML anchor with htmltools::a().
In order to create a link to slide #2, you need to write:
htmltools::a("text", href = "javascript:slidedeck.loadSlide(2)")
You can easily vectorize this expression. Don't forget to pass the resulting list to htmltools::tagList().
Here's a minimal Rmd with the example referenced in the question:
---
title: "Presentation"
output: ioslides_presentation
---
## Slide 1 - page 2
This is the first slide. With links to other slides:
```{r echo=FALSE}
input <- data.frame(text = c("a", "b", "c"),
page_number = c(3, 5, 6))
htmltools::tagList(
mapply(
htmltools::a,
input$text,
href = sprintf("javascript:slidedeck.loadSlide(%i)", input$page_number),
SIMPLIFY = FALSE)
)
```
\
If you prefer the tidyverse:
```{r echo=FALSE, message=FALSE}
library(tidyverse)
tribble(
~text, ~page_number,
"a", 3,
"b", 5,
"c", 6
) %>%
transmute(
text,
href = str_glue("javascript:slidedeck.loadSlide({page_number})")
) %>%
pmap(~ htmltools::a(.x, href = .y)) %>%
htmltools::tagList()
```
## Slide 2 - page 3
Text for slide 2
## Slide 3 - page 4
Text for slide 3
## Slide 4 - page 5
Text for slide 4
## Slide 5 - page 6
Text for slide 4