Why is the parameter d showing as undefined in AttrTween function in Angular with d3.js?

While the chart itself is rendering correctly, there seems to be an issue in the animation aspect. Below is the segment of code causing trouble.

chartGroup.select('.arc')
          .transition().duration(3000)
          .attrTween('d',function(d:DefaultArcObject){
               console.log(d);
               const iterpolate=d3.interpolate(0,d.endAngle);
               return (t)=>{
                  d.endAngle=interpolate(t);
                  return arc(d);
               }
          }

The error being thrown is described here:

Cannot read properties of undefined (reading 'endAngle')

The parameter d is showing up as undefined.

Versions Report

  • angular CLI: 9.1.2
  • Node: 12.20.1
  • d3: 7.3.0
  • @types/d3: 7.1.0
angulartypescriptd3.js

Answer №1

Follow this snippet of code to animate a chart:

chartGroup.select('.arc')
      .transition().duration(3000)
      .attrTween('d',function(d:DefaultArcObject){
           console.log(d);
           const interpolate=d3.interpolate(0,d.endAngle);
           return (t)=>{
              if(d?.endAngl) {
                 d.endAngle=interpolate(t);
              }
              return arc(d);
           }
      }

Answer №2

It seems like you're utilizing a function without properly binding the JavaScript context. The correct code should look something like this:

chartGroup.select('.arc')
          .transition().duration(3000)
          .attrTween('d', (d: DefaultArcObject) => {
               console.log(d);
               const interpolate = d3.interpolate(0, d.endAngle);
               return (t) => {
                  d.endAngle = interpolate(t);
                  return arc(d);
               }
           }.bind(this));

Additionally, adding .bind(this) after your function can also be beneficial. To further enhance your understanding of this concept, consider researching JavaScript arrow functions, binding, or 'this'.

I hope this explanation clarifies things for you.

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