score:1
you're attempting to append to a transition:
labelselection.enter()
.append('text') // returns a selection of newly entered text elements
.style(...) // returns that same selection
.attr(... ) // returns that same selection
// ...
.transition() // returns a transition
.duration(450) // returns that same transition
.ease(...) // returns that same transition
// ...
.text(d => d.name) // returns that same transition
.append(...) // error
transitions and selections share a lot of methods (such as .style()
, .attr()
, and even .text()
), so they can look very similar, but they don't share all methods.
you can do selection.append()
, but not transition.append()
. this is why you get your error message, append
isn't a method of a transition, which explains your error message:
labelselection.enter(...).append(...).style(...).style(...).style(...).attr(...).style(...).transition(...).duration(...).ease(...).attr(...).attr(...).style(...).style(...).style(...).style(...).style(...).text(...).append is not a function
.text returns a transition in this case (as it was chained to a transition, as shown above in the first code block), so we can reduce this to "transition.append is not a function".
instead, you could break up your method chaining by keeping a reference to the relevant selection:
var labelenter = labelselection.enter()
.append('text')
.style(...)
.attr(... )
// ...
labelenter.transition()
.duration(450)
.ease(...)
// ...
labelenter.append("title")
.text(...)
the alternative, which i would think makes your method chain unnecessarily long, is to use transition.selection()
, which returns the selection that the transition corresponds to:
labelselection.enter()
.append('text')
.style(...)
.attr(... )
// ...
.transition()
.duration(450)
.ease(...)
// ...
.text(d => d.name);
.selection() // return a selection instead of a transition
.append("title")
.text(...)
Source: stackoverflow.com
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