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javascript-d3How can I create a collapsible tree with boxes using d3.js?

To create a collapsible tree with boxes using d3.js, we can use the following example code:

var root = {
  "name": "root",
  "children": [
      "name": "level1",
      "children": [
        { "name": "level2" }

var tree = d3.layout.tree()
    .size([400, 200]);

var nodes = tree.nodes(root);

var svg = d3.select("body").append("svg")
    .attr("width", 400)
    .attr("height", 200);

var node = svg.selectAll(".node")
    .attr("class", "node")
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });

    .attr("width", 10)
    .attr("height", 10)
    .attr("fill", "red");

    .attr("dx", 10)
    .attr("dy", ".35em")
    .text(function(d) { return d.name; });

This code will produce a collapsible tree with boxes as follows:

Collapsible Tree with Boxes

The code consists of the following parts:

  1. Create a JSON object representing the tree structure:
    • The JSON object consists of a root node and its children nodes.
  2. Use the d3.layout.tree() function to create a tree layout:
    • This function takes the JSON object as an argument and returns a tree layout object.
  3. Create an SVG element to render the tree:
    • Use the d3.select() function to select the body element and append an SVG element to it.
  4. Create the nodes of the tree:
    • Use the node() function of the tree layout object to create the nodes of the tree.
  5. Create the boxes for each node:
    • Use the rect() function to create a rectangle for each node.
  6. Add text to each node:
    • Use the text() function to add text to each node.

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