How selection.join behaves when every node contains child elements

I have been following the amazing tutorial on to learn more about the join paradigm.

Everything was working fine until I tried to make each node more complex by adding a group with text inside. The main group gets updated, but the child one does not.

Snippet of Code

Check out https://codepen.io/daohodac/pen/JjdJWEV (letters1 is already loaded. Click on update to load the letters2 dataset)

const letters1 = "abcdefghijkl".split("").map((l,i) => ({l:l, color:'green', shift:0}));
const letters2 = "abcdefghijklmnopqrstuvwxyz".split("").map((l,i) => ({l:l, color:'red', shift:i*5}));

In this code snippet, the data gets updated correctly on the root node (<g> shifts according to the new value of shift), but the color of the inner text remains the same for the preloaded letters. The data is properly bound to the <g> element. How can I instruct d3 to also apply it to the <text> child element?

javascriptd3.js

Answer №1

It is important to note that this behavior is expected. Essentially, you are updating the data for the parent (<g>) elements, but not for the children (<text>) elements.

When you call the fillNode function, the text elements inherit the initial dataset, which includes the append method that propagates the data. However, since fillNode is only called for entering groups, the texts inside updated groups do not receive the new data even though the parent's data is updated correctly.

You can easily observe this by logging the data for the <text> elements after updating the group data. The console will show that the green color persists for letters a to l:

Your rewritten text here...

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