The use of D3.js causes 'this' to inherently assume the 'any' type due to the lack of a type annotation

I am working with the 3D.js library and trying to create a graph:

d3.select(`#myGraph`)
  .append('svg')

const svg = d3.select(`#myGraph svg`).append('g')

const nodeEnter = svg.selectAll("g.node")
  .data(nodes)
  .enter()
  .append("g")
  .attr("class", "node")
  .call(force.drag())

svg.selectAll(".node")
      .each(function (d: any) {
        d3.select(this)
          .attr("data-source", d.id)
      })

However, I encountered an error stating: 'this' implicitly has type 'any' because it does not have a type annotation

Is there a way to resolve this issue without using @ts-ignore?

typescriptd3.js

Answer №1

To specify the type of this in the function, you can add a type annotation:

  svg.selectAll(".node")
      .each(function (this: any, d: any) {
        d3.select(this)
          .attr("data-source", d.id)
      })

Alternatively, if you prefer not to use any, you can declare it as SVGGraphicsElement, which is a more generic SVG element type. For greater specificity, you can also specify a more particular type like SVGRectElement or SVGGElement based on the selection.

  svg.selectAll(".node")
      .each(function (this: SVGGraphicsElement, d: any) {
        d3.select(this)
          .attr("data-source", d.id)
      })

Answer №2

I encountered a similar issue while working on an angular application that required me to display information upon hovering over generated rectangles.

Here was the challenge I faced:

boxes.on('mouseover', (mouseEvent, d) => { d3.select(this) ...

The issue stemmed from the fact that "this" was implicitly typing as any...

The event includes a current element referred to as currentTarget So instead of:

d3.select(this)

In my TypeScript application, I used:

d3.select(mouseEvent.currentTarget)

Implementing this change successfully resolved the problem for me.

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