英文:
echarts4r use valueFormatter in tooltip
问题
valueFormatter选项在echarts4r的tooltip中使用。根据e_tooltip的文档，我应该能够使用传递给echarts的...参数。
例如，我希望以下代码能够正常工作：
library(dplyr)
library(echarts4r)
mtcars |>
group_by(cyl, gear) |>
summarise(mpg = mean(mpg)) |>
mutate(gear = as.character(gear)) |>
e_charts(gear) |>
e_bar(mpg) |>
e_tooltip(
trigger = "axis",
valueFormatter = htmlwidgets::JS("(value) => 'MPG is ' + value.toFixed(2)")
)
如果省略valueFormatter，则会看到以下图片。目标是在工具提示中显示彩色点，然后在工具提示的右侧显示MPG is 21.50（注意，它精确到2位小数，即显示尾随的0），MPG is 17.75和MPG is 15.05。
不幸的是，工具提示无法正常工作，而且会崩溃/不显示任何内容。
感谢任何帮助。
英文:
I want to use the valueFormatter option in an echarts4r tooltip.
Following the documentation of e_tooltip I should be able to use the ... args as they are passed to echarts.
For example I would expect this to work
library(dplyr)
library(echarts4r)
mtcars |>
group_by(cyl, gear) |>
summarise(mpg = mean(mpg)) |>
mutate(gear = as.character(gear)) |>
e_charts(gear) |>
e_bar(mpg) |>
e_tooltip(
trigger = "axis",
valueFormatter = htmlwidgets::JS("(value) => 'MPG is ' + value.toFixed(2)")
)
Leaving out the valueFormatter, I see this picture. The goal is to have the colored-dots in the tooltip and then on the RHS of the tooltip I want to see MPG is 21.50 (Note that its fixed to 2 digits! aka showing the trailing 0), MPG is 17.75 and MPG is 15.05.
Unfortunately, the tooltip does not work and crashes/shows nothing.
Any help is appreciated.
答案1
得分: 1
问题在于传递给你的格式化程序的 value 是一个字符串。因此，你首先必须将其转换为一个 Number，然后应用 toFixed 方法：
library(dplyr)
library(echarts4r)
mtcars %>%
group_by(cyl, gear) %>%
summarise(mpg = mean(mpg)) %>%
mutate(gear = as.character(gear)) %>%
e_charts(gear) %>%
e_bar(mpg) %>%
e_tooltip(
trigger = "axis",
valueFormatter = htmlwidgets::JS("(value) => 'MPG is ' + Number(value).toFixed(2)")
)
<details>
<summary>英文:</summary>
The issue is that the `value` passed to your formatter is a string. Hence, you have to first convert to a `Number` to apply the `toFixed` method:
library(dplyr)
library(echarts4r)
mtcars |>
group_by(cyl, gear) |>
summarise(mpg = mean(mpg)) |>
mutate(gear = as.character(gear)) |>
e_charts(gear) |>
e_bar(mpg) |>
e_tooltip(
trigger = "axis",
valueFormatter = htmlwidgets::JS("(value) => 'MPG is ' + Number(value).toFixed(2)")
)
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/1uhCu.png
</details>
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