Styles in component for D3.js do not show in angular 2

[hongbo-miao]

I am using Angular 2 and D3.js. I want to show a red rectangle.

It only works if I put styles in the style.css file. Check this plunkr

When I put my styles in the component styles: [], it does not work. Check this plunkr

Refer to Stack Overflow.

import {Component} from 'angular2/core'
@Component({
  selector: 'my-app',
  providers: [],
   styles: [`
    /*this does not work*/
    .bar {
      fill: red;
    }
  `],
  template: `
    <div>
      <svg class="chart"></svg>
    </div>
  `,
  directives: []
})
export class App {
  constructor() {}

  ngOnInit() {
    this.draw();
  }

  draw() {
    let data = [{name: 'A', value: 1}];
    let width = 400, height = 200;

    let x = d3.scale.ordinal().rangeRoundBands([0, width]);
    let y = d3.scale.linear().range([height, 0]);

    let chart = d3.select(".chart")
      .attr("width", width)
      .attr("height", height)
      .append("g");

    x.domain(data.map(function(d) { return d.name; }));
    y.domain([0, d3.max(data, function(d) { return d.value; })]);

    chart.selectAll(".bar")
      .data(data)
      .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.name); })
      .attr("y", function(d) { return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); })
      .attr("width", x.rangeBand());
  }
}

[zoechi]

That's by design. Angular adds class names unique to components and rewrites the added styles to only apply to the components where they were added.

D3 generates HTML dynamically without Angulars knowledge and Angular can't apply the classes to make the styles apply on the generated HTML.

If you add the styles at the entry point HTML file, Angular also doesn't rewrite the styles and the added helper classes don't take effect.

With encapsulation: ViewEncapsulation.None Angular doesn't do this rewriting, therefore the result is similar to adding the HTML to the index.html.

Alternatively you can use the recently introduced shadow piercing CSS combinators >>>, /deep/ and ::shadow. See also http://stackoverflow.com/a/36225709/217408

[hongbo-miao]

@zoechi thank you so much!! It is working perfectly!

For other people, for more details about @zoechi's solution , please check here

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