Angular 2: Assigning a class to a D3 element using the component's style

When creating a component in Angular 2, the `app.component.css` file defines a class called `h-bar`:

https://i.sstatic.net/AG1ER.png

In the `app.component.ts` file, d3 is utilized to create elements that should apply the `h-bar` class from the `app.component.css` file.

d3.select("#container").selectAll("div.h-bar") // <- C
                .data(data) // <- D
                .enter() // <- E
                .append("div") // <- F                
                .attr("class", "h-bar")                
                .append("span"); // <- G    

However, there seems to be an issue with rendering the style properly. Upon inspecting the generated HTML, it was noticed that the random _ngcontent-baf-1 (possibly related to `module.id`) attribute is missing from the elements created by d3.

https://i.sstatic.net/H6GY6.png

To address this, the intention is to add the `module.id` attribute to these elements:

// Enter
            d3.select("#container").selectAll("div.h-bar") // <- C
                .data(data) // <- D
                .enter() // <- E
                .append("div") // <- F          
                .attr(module.id, "")                      
                .attr("class", "h-bar")                
                .append("span"); // <- G 

Unfortunately, attempting to use `module.id` as an attribute name resulted in an error indicating that it is invalid:

https://i.sstatic.net/yl062.png

If you have any insights or solutions, they would be greatly appreciated. Thank you!

Answer №1

When it comes to encapsulated styles, they are designed to only function for DOM objects that are managed by Angular.

In order to address this issue, I recommend disabling encapsulation for this particular component:

@Component({
  ...,
  encapsulation: ViewEncapsulation.None
})

However, keep in mind that doing so can lead to the pollution of your global CSS namespace, so it's important to ensure that your ids and classes remain unique to this component.

If you prefer to maintain encapsulation, you can try the following approach:

constructor(private hostRef: ElementRef) { }

ngOnInit() {
   this.ngContentId = '_ngcontent-' + this.hostRef.nativeElement.attributes[1].name.substr(8);
}
  
addStuff(){
   d3.select("#container").selectAll("div.h-bar") // <- C
     .data(data) // <- D
     .enter() // <- E
     .append("div") // <- F          
     .attr(this.ngContentId, "")
     .attr("class", "h-bar")
     .append("span"); // <- G 
}

Please note that this solution is a temporary fix and assumes that the host id will always be attributes[1]. If this varies, you may need to implement a loop through the attributes to identify the correct one.

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