D3.js check to see if a node has a class

Question

I'm trying to write a `click` function to select the next `g.slice` node, add a class of `.sliceActive` to it and remove `.sliceActive` from the original `.slice`. However, only when you are at the last `g.slice` (with a class of `.slice5`) you would add the `.sliceActive` to the the first `g.slice` with a class of `.slice0`. This is what I have so far that is not working. I think the problem is I don't know how to see if the current `.sliceActive` node also has the class of `.slice5`. ``` $(".next").click(function(){ var nextSlice; if(d3.select("g.sliceActive").hasClass("slice5")){ nextSlice= d3.select(".slice0"); }else{ nextSlice= d3.select("g.sliceActive + g"); } d3.select("g.sliceActive").classed("sliceActive",false); nextSlice.classed("sliceActive",true); }); ``` And here is how it looks in the web inspector:

Accepted Answer

d3's `classed` function with no second parameter will return whether the selected element has the passed class.

```
d3.select("g.sliceActive").classed("slice5")
```

Should tell you what you need to know.

D3.js check to see if a node has a class

Solution

Problem