Navigating through the DOM with d3.js: mastering the art of traversing upwards

My understanding of javascript, the DOM, and d3.js is still a work in progress. I apologize for asking such a basic question as the one below. I'm new to this.

Here's the json data I have:

[{"link":"a", "count": 3}, {"link":"b", "count": 4}, {"link":"c", "count": 2}]

and I want to create something that resembles

<ul>
    <li> <a>a</a> (3)</li>
    <li> <a>b</a> (4)</li>
    <li> <a>c</a> (2)</li>
</ul>

using d3.js (I have bigger plans with d3, this is just a starting point).

After inserting a <ul> tag in my html, within a callback function from d3.json, I could write something like this:

d3.select("ul")
    .selectAll("li")
    .data(json)
    .enter()
    .append("li")
    .append("a")
    .text(function(d){return d.link})

(though this code hasn't been tested! how do javascript developers test small snippets of code?). This code will likely give me

<ul>
    <li><a>a</a></li>
    <li><a>b</a></li>
    <li><a>c</a></li>
</ul>

but now I can't seem to get out of the <a> tags! I can't figure out how to add that extra information before closing the list item tag. What should I do?

Answer №1

Keep it simple: avoid excessive method chaining. :)

let list = d3.select("ul");

let listItem = list.selectAll("li")
    .data(data)
  .enter().append("li");

let link = listItem.append("a")
    .text(function(d) { return d.link; });

You can now include additional content within the li element. Since D3 only supports adding elements (not raw text nodes), consider including a span tag for extra information:

listItem.append("span")
    .text(function(d) { return " (" + d.count + ")"; });

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