Why Isn\'t My Code Executing Inside the d3.json() Callback in D3 v5?

Code not Executed Inside D3.json() Callback

Question:

In D3 v5, the code written within the callback function of d3.json() is not executing. Consoles logs placed inside the callback are being skipped, preventing further execution of the script.

Answer:

D3 v5 introduces a significant change in the signature of d3.json(). The callback function used to handle the request has been replaced with an optional RequestInit object. Instead, d3.json() now returns a Promise that can be handled using its .then() method.

To resolve the problem, update your code as follows:

d3.json("/trip_animate/tripData.geojson")
  .then(function(data){
    // Code from your callback goes here...
  });

The error handling mechanism has also changed in D3 v5. Error handling should now be done using the Promise's .catch() method or by passing a rejection handler to .then() as its second argument.

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