How to dynamically change data for progress bar in d3.js?

@wilmer.lemke 

To dynamically change data for a progress bar in d3.js, you can follow these steps:

1. Define the initial data for the progress bar. This data should include the current progress value and the maximum value of the progress bar.
2. Create an SVG element to hold the progress bar visuals. This can be done using d3.select() and d3.append().
3. Create the progress bar visuals, such as the background bar and the progress bar itself, using d3 selection and styling.
4. Update the progress bar visuals based on the initial data. You can use d3 scales to map the progress data to the visual representation of the progress bar.
5. To dynamically change the progress data, update the data bound to the progress bar visuals and re-render the progress bar using d3 transitions.

Here is an example code snippet to demonstrate dynamically changing data for a progress bar in d3.js:

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// Initial data
let data = { current: 50, max: 100 };

// SVG element
let svg = d3.select("#progress-bar")
  .append("svg")
  .attr("width", 400)
  .attr("height", 50);

// Background bar
svg.append("rect")
  .attr("width", 400)
  .attr("height", 20)
  .attr("fill", "#ccc");

// Progress bar
let progress = svg.append("rect")
  .attr("width", 0)
  .attr("height", 20)
  .attr("fill", "blue");

// Update progress bar
function updateProgress(newData) {
  progress.transition()
    .duration(500)
    .attr("width", newData.current / newData.max * 400);
}

// Example of dynamically changing data
setTimeout(() => {
  data.current = 75;
  updateProgress(data);
}, 1000);

In this example, the progress bar is initially set to 50% progress. The updateProgress function is used to update the progress based on new data. In this case, the progress data is dynamically changed to 75% after 1 second, and the progress bar is updated accordingly.