如何在没有注释的情况下获取dygraph中显示的工具提示
我正在尝试使用dygraphs的R实现
提供的例子是
library(dygraphs)
dygraph(presidents, main = "Presidential Approval") %>%
dyAxis("y", valueRange = c(0, 100)) %>%
dyAnnotation("1950-7-1", text = "A", tooltip = "Korea") %>%
dyAnnotation("1965-1-1", text = "B", tooltip = "Vietnam")
这导致了图表 
悬停在'A'上会产生一个提示'韩国'
我非常希望为每个点提供一个工具提示，最好完全符合文本要求 - 尽管将文本设置为“”并且最小高度/宽度值可能就足够了。 我也想通过日期和工具提示栏以编程方式附加dyAnnotations
df <- data.frame(date=as.Date(c("1950-7-1","1965-1-1")),tooltip=c("Korea","Vietnam"))
这是否可行，如果是这样，如何？ TIA
好吧，按照承诺，这里是我们如何使用图例来获取信息的开始。 我们粗暴地覆盖了这个传说。 如果你还想要一个图例，这种行为可以变得更有礼貌。 另外，你可以提供一个带有data.frame的对象/散列来查找x并返回一个信息丰富的描述。
我添加了一个debugger所以如果你在Chrome中打开调试器等，你可以看到发生了什么。
library(dygraphs)
dyG = dygraph(presidents, main = "Presidential Approval") %>%
dyAxis("y", valueRange = c(0, 100))
# explore the legend route
dyG %>%
dyCallbacks(
highlightCallback = sprintf(
'function(e, x, pts, row) {
// added to illustrate what is happening
// remove once satisfied with your code
debugger;
var customLegend = %s
// should get our htmlwidget
e.target.parentNode.parentNode
.querySelectorAll(".dygraph-legend")[0]
.innerText = customLegend[row] + row;
}'
,# supply a vector or text that you would like
jsonlite::toJSON(rep('something here',length(as.vector(presidents))))
)
)
下面，我改变了添加到图例而不是替换。
# explore the legend route
# add to legend rather than replace
dyG %>%
dyCallbacks(
highlightCallback = sprintf(
'function(e, x, pts, row) {
// added to illustrate what is happening
// remove once satisfied with your code
debugger;
var customLegend = %s
// should get our htmlwidget
var legendel = e.target.parentNode.parentNode
.querySelectorAll(".dygraph-legend")[0];
// should get our htmlwidget
legendel.innerHTML = legendel.innerHTML + "<br>" + customLegend[row];
}'
,# supply a vector or text that you would like
jsonlite::toJSON(rep('something here',length(as.vector(presidents))))
)
)
大多数Dygraphs自定义都发生在CSS样式中。 例如，以下是我们如何更改默认工具提示行为。 考虑到这一点以及Dygraphs注释文档的一些帮助，我们可以为第一个问题做这样的事情。
# answers Stack Overflow question
# http://stackoverflow.com/questions/27671576/how-can-i-get-tooltips-showing-in-dygraphs-without-annotation
# on how to customize annotations
library(dygraphs)
# question is two parts - let's handle part 1 first
dygraph(presidents, main = "Presidential Approval") %>%
dyAxis("y", valueRange = c(0, 100)) %>%
dyAnnotation("1950-7-1", text = "Korea", tooltip = ""
# this is not necessary but think it better to be specific
,cssClass = "specialAnnotation") %>%
# will leave this as before
dyAnnotation("1965-1-1", text = "Vietnam", tooltip = "") -> dyG
#this is a hack to set css directly
# dyCSS designed to read a text css file
dyG$x$css = "
/* if cssClass not assigned use .dygraphDefaultAnnotation */
/* !important is critical for the rules to be applied */
.specialAnnotation {
overflow: visible !important;
width: initial !important;
}
"
对于第二个问题，这里是我们可以完成这个的一个方法
# now for part 2
dyG = dygraph(presidents, main = "Presidential Approval") %>%
dyAxis("y", valueRange = c(0, 100))
tooltips = list(
list(x = "1950-7-1", tooltip = "", text = "Korea")
,list(x = "1965-1-1", tooltip = "", text = "Vietnam")
)
annotator <- function(x,y){
d = do.call(dyAnnotation,modifyList(list(dygraph=x),y))
return(d)
}
dyG = Reduce( annotator, tooltips, init=dyG )
#this is a hack to set css directly
# dyCSS designed to read a text css file
dyG$x$css = "
/* if cssClass not assigned use .dygraphDefaultAnnotation */
/* !important is critical for the rules to be applied */
.dygraphDefaultAnnotation {
overflow: visible !important;
width: initial !important;
border: none !important;
font-size: 200% !important;
}
"
dyG
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