R echarts4r -轴格式日期

Question

如何在echarts4r中控制日期格式？货币、百分比和小数点有格式化程序，但我看不到日期。

下面是来自https://rpubs.com/paul_simmering/echarts的一个例子

library(echarts4r)
library(nycflights13) # data
library(tidyverse)

flights_ts <- flights %>% 
  transmute(week = as.Date(cut(time_hour, "week")), dep_delay, origin) %>% 
  group_by(origin, week) %>% # works with echarts
  summarise(dep_delay = sum(dep_delay, na.rm = TRUE))

ts_base <- flights_ts %>% 
  e_charts(x = week) %>% 
  e_datazoom(
    type = "slider", 
    toolbox = FALSE,
    bottom = -5
  ) %>% 
  e_tooltip() %>% 
  e_title("Departure delays by airport") %>% 
  e_x_axis(week, axisPointer = list(show = TRUE))

ts_base %>% e_line(dep_delay)

图表日期是按月-月-年格式的，我想将其更改为年月日：

​

Answer 1

您可以将一个自定义JavaScript函数传递给axisLabel中的formatter参数，如下所示：

library(echarts4r)
library(nycflights13) # data
library(tidyverse)

yearMonthDate <- htmlwidgets::JS('function (value) {
  var d = new Date(value);
  var datestring = d.getFullYear() + "-" + ("0"+(d.getMonth()+1)).slice(-2) + "-" + ("0" + d.getDate()).slice(-2)
  return datestring
}')

ts_base <- flights_ts %>% 
  e_charts(x = week) %>% 
  e_datazoom(
    type = "slider", 
    toolbox = FALSE,
    bottom = -5
  ) %>% 
  e_tooltip() %>% 
  e_title("Departure delays by airport") %>% 
  e_x_axis(
    week, 
    axisPointer = list(show = TRUE),
    axisLabel = list(
      formatter = yearMonthDate
    ))

ts_base %>% e_line(dep_delay)

你会得到：

​

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