Loop through dataframe to add annotations to dygraph in R

Question

I would like to loop through a dataframe and add annotations like

#df.dates is a dataframe with dates in it

for(i in 1:nrow(df.dates))
{
  myDyGraph %>%
  dyAnnotation(df.dates[i], text = "some text here" )
}

When i run this the chart doesn't update?

Answer 1

Create a chart variable, then add the annotations to it with a loop. So your example would become:

myDyGraph <- dygraph(df)

for(i in 1:nrow(df.dates))
{ 
  myDyGraph <- myDyGraph %>% dyAnnotation(df.dates[i], text = "some text here" )
}

myDyGraph

Similar example with DyLimits here