Exploring data that is nested within its parent

I'm struggling to understand the concept of Nested selections or how to apply it to my specific situation.

Here is an example of the JSON data format I am working with:

{
  'name': 'root'
  'children': [
    {
      'name': 'child1'
    },
    {
      'name': 'child2'
    }
  ]
}

My goal is to display the child data within the root node. For instance, if I have the following code:

nodeEnter.append("text")
      .text(d.name)

At this juncture, my event handler is the data from the root node. How can I access the child objects' data from there in order to render something like "root (child1, child2)" using the code snippet above?

Answer ā„–1

Here is a suggestion to consider:

let offspringTitles = data.children.map((offspring) => {
  return offspring.title;
});

nodeEntrance
  .append("text")
  .text(data.title + ' (' + offspringTitles.join(', ') + ')');

Answer ā„–2

If you're looking to show specific content, you can achieve that with the following code structure using nested selections:

var container = d3.selectAll("section").data(data).enter().append("section");
container.append("div").text(function(d) { return d.title; });
// nested selection starts here
container.selectAll("div.item").data(function(d) { return d.items; })
   .enter().append("div").attr("class", "item")
   .text(function(d) { return d.content; });

Check out the demonstration on jsfiddle.

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