Agfdhyk

I am trying to learn to use D3 with angular. As a beginner I am trying to implement a simple project written by William Liu a few years ago (http://bl.ocks.org/WilliamQLiu/76ae20060e19bf42d774)
I could replicate most of the code but get compilation errors as below :

error TS2345: Argument of type 'BaseType' is not assignable to parameter of type 'ContainerElement'.
Type 'Element' is not assignable to type 'ContainerElement'.
Type 'Element' is not assignable to type 'SVGGElement'.
Property 'farthestViewportElement' is missing in type 'Element'.

error TS2339: Property 'dataset' does not exist on type 'BaseType'.
Property 'dataset' does not exist on type 'Element'.

error TS2339: Property 'dataset' does not exist on type 'BaseType'.
Property 'dataset' does not exist on type 'Element'.

I have created a component called dragex. The code is as below

import { Component, OnInit } from '@angular/core';

import * as d3 from 'd3';





@Component({

  selector: 'dragex',

  templateUrl: './dragex.component.html',

  styleUrls: ['./dragex.component.css']

})

export class DragexComponent implements OnInit {

 private dataset = [

    { x: 100, y: 110 },

    { x: 83, y: 43 },

    { x: 92, y: 28 },

    { x: 49, y: 74 },

    { x: 51, y: 10 },

    { x: 25, y: 98 },

    { x: 77, y: 30 },

    { x: 20, y: 83 },

    { x: 11, y: 63 },

    { x:  4, y: 55 },

    { x:  0, y:  0 },

    { x: 85, y: 100 },

    { x: 60, y: 40 },

    { x: 70, y: 80 },

    { x: 10, y: 20 },

    { x: 40, y: 50 },

    { x: 25, y: 31 }

  ];



  constructor() { }



  ngOnInit() {

    this.drawchart();

  }



  private drawchart() {

    const margin = {

      top: 40,

      right: 20,

      bottom: 20,

      left: 40

    },

    width = 960, // window.innerWidth,

    height = 500, // window.innerHeight,

    radius = 6;



  let svg = d3.select('body').append('svg')

      .attr('width', width )

      .attr('height', height);



  let xScale = d3.scaleLinear()

    .domain([0, d3.max(this.dataset, function(d) { return d.x + 10; })])

    .range([margin.left, width - margin.right]);



    let yScale = d3.scaleLinear()

    .domain([0, d3.max(this.dataset, function(d) { return d.y + 10; })])

    .range([margin.top, width - margin.bottom]);



    let xAxis = d3.axisTop(xScale);

    let yAxis = d3.axisLeft(yScale);



    let circleAttrs = {

      cx: function(d) { return xScale(d.x); },

      cy: function(d) { return yScale(d.y); },

      r: radius

    } ;



    svg.append('g')

      .attr('class', 'axis')

      .attr( 'transform', 'translate(' + [margin.left, 0] + ')')

      .call(yAxis);



    svg.selectAll('circle')

      .data(this.dataset)

      .enter().append('circle')

      .attr('cx', circleAttrs.cx)

      .attr('cy', circleAttrs.cy)

      .attr('r', circleAttrs.r)

      .on('mouseover', handleMouseOver)

      .on('mouseout', handleMouseOut);



    svg.on('click', function() { 

      let coords = d3.mouse(this);



      let newData = {

        x: Math.round(xScale.invert(coords[0])),

        y: Math.round(yScale.invert(coords[1]))

      };





      this.dataset.push(newData);





      svg.selectAll('circle')

      .data(this.dataset)

      .enter().append('circle')

      .attr('cx', circleAttrs.cx)

      .attr('cy', circleAttrs.cy)

      .attr('r', circleAttrs.r)

      .on('mouseover', handleMouseOver)

      .on('mouseout', handleMouseOut);



    });









    function handleMouseOver(d, i) {

      d3.select(this)

        .attr('fill', 'green')

        .attr('r', radius * 2 );



      svg.append('text')

        .attr('id', 't' + d.x + '-' + d.y + '-' + i)

        .attr('x', function() { return xScale(d.x) - 30 ; })

        .attr('y', function() { return yScale(d.y) - 15 ; })

        .text(d.x + ',' + d.y );



    }



    function handleMouseOut(d, i) {

      d3.select(this)

        .attr('fill', 'black')

        .attr( 'r', radius);



      d3.select('id').remove();

    }

  }

}

The errors are thrown on
let coords = d3.mouse(this);
this.dataset.push(newData);
.data(this.dataset)

The plunker for the same is available at
https://plnkr.co/edit/pM5ZsVw7EOm4bMI94JKj?p=info

On hovering over this in the above lines it shows d3.BaseType whereas ideally it should show this: this

I have had a look at other articles but none of them is pointing at the same solution.

Help!

===========================================================================

I shifted out the functions in that code into a new function (as below) and the errors go away.
Just have a DOM error now that shows this.dataset.push is not a function.

function onClickIn(d, i) {

  let coords = d3.mouse(this);

  console.log('here in onclick function');



  let newData = {

    x: Math.round(xScale.invert(coords[0])),

    y: Math.round(yScale.invert(coords[1]))

  };



  console.log('new point- x:'+ newData.x + ',' + newData.y);

  this.dataset.push(newData);



  svg.select('circle')

    .data(this.dataset)

    .enter().append('circle')

    .attr('cx', circleAttrs.cx)

    .attr('cy', circleAttrs.cy)

    .attr('r', circleAttrs.r)

    .on('mouseover', handleMouseOver)

    .on('mouseout', handleMouseOut);

}

Try replacing:

let coords = d3.mouse(this);

For

let aux:any = this

let coords = d3.mouse(aux);

This way you fool the Typescript Compiler.

Use type assertion

const coords = d3.mouse(this as SVGGElement);