Is it necessary for the data to be in JSON format in order to utilize d3.js methods?

Question

Is it necessary for the data to be in JSON format in order to utilize d3.js methods?

Is there a way to utilize methods such as nest() with data in the format of an array of arrays rather than an array of objects?

Edit: I am unable to access values using attribute names like d.name because the data is constantly changing. The attribute names and values are determined by user input files. Instead of accessing by d.name, I would like to access by index value d[0] based on the user's selection of a specific attribute.

In addition, is it necessary to use a server to implement d3.js as detailed here: ?

Thank you for your assistance,

javascript arrays json csv d3.js

Answer 1

Answer №1

It seems like your question is quite broad and not very clear, making it difficult to understand exactly what you're asking. However, I'll address the specific part that I can decipher:

How can methods like nest() be used with data in an array of arrays format instead of an array of objects?

d3 offers accessor methods which are essentially functions that retrieve a specific piece of your data. While most examples use arrays of objects with these functions returning object properties, you can also extract values from inner arrays. Here's an example of using nest with an array of arrays. I've created a key accessor function that returns a portion (the first value) of each inner array:

<!DOCTYPE html>
<html>

<head>
  <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6f0b5c2f5b415f415f">[email protected]</a>" data-semver="4.0.0" src="https://d3js.org/d3.v4.min.js"></script>
</head>

<body>
  <script>
    var data = [
      [0, 1],
      [0, 2],
      [0, 3],
      [1, 1],
      [1, 2],
      [1, 3]
    ];

    var entries = d3.nest()
      .key(function(d) {
        return d[0];
      })
      .entries(data);

    console.log(entries);
  </script>
</body>

</html>

Answer 2

It seems like your question is quite broad and not very clear, making it difficult to understand exactly what you're asking. However, I'll address the specific part that I can decipher:

How can methods like nest() be used with data in an array of arrays format instead of an array of objects?

d3 offers accessor methods which are essentially functions that retrieve a specific piece of your data. While most examples use arrays of objects with these functions returning object properties, you can also extract values from inner arrays. Here's an example of using nest with an array of arrays. I've created a key accessor function that returns a portion (the first value) of each inner array:

<!DOCTYPE html>
<html>

<head>
  <script data-require="<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6f0b5c2f5b415f415f">[email protected]</a>" data-semver="4.0.0" src="https://d3js.org/d3.v4.min.js"></script>
</head>

<body>
  <script>
    var data = [
      [0, 1],
      [0, 2],
      [0, 3],
      [1, 1],
      [1, 2],
      [1, 3]
    ];

    var entries = d3.nest()
      .key(function(d) {
        return d[0];
      })
      .entries(data);

    console.log(entries);
  </script>
</body>

</html>

Is it necessary for the data to be in JSON format in order to utilize d3.js methods?

Answer №1

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