The browser failed to display the SVG image, and the console log indicated that the promise was rejected, with the message "false."

I'm struggling to understand why my SVG isn't showing up on the screen. The console log is displaying "false," which I believe indicates that a promise was rejected

Here is the TypeScript file I am working with:

export class PieChartComponent implements AfterViewInit {
//other initializations removed for brevity
  convertedData: Map<string, number> = new Map();

  ngAfterViewInit() {
    d3.csv('app/data/data.csv').then((data) => {
      data.forEach((d) => {
        this.convertedData.set(d['name'], Number(d['age']));
      });
    });

    this.svg = d3
      .select('#canvas-area')
      .append('svg')
      .attr('width', 400)
      .attr('height', 400);

    this.circles = this.svg.selectAll('circle').data(this.convertedData);

    this.circles
      .enter()
      .append('circle')
      .attr('cx', (d, i) => i * 50 + 50)
      .attr('cy', 250)
      .attr('r', (d) => 2 * d[0])
      .attr('fill', (d) => {
        if (d[1] == 'Jessica') return 'blue';
        return 'red';
      });
  }
}

Additionally, in my HTML file:

<div id="canvas-area"></div>

The contents of my data.csv file are as follows:

name,age
Tony,10
Jessica,12
Andrew,9
Emily,10
Richard,11

Answer №1

The function d3.csv() returns a promise, but without awaiting its completion, the variable this.convertedData will most likely be empty when you try to access it.

To fix this issue, update your code to something similar to the following:

async ngAfterViewInit() {
  await d3.csv('app/data/data.csv').then((data) => {
    data.forEach((d) => {
      this.convertedData.set(d['name'], Number(d['age']));
    });
  });

  // continue with the rest of your code here
}

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