Is the transcluded content visible to the class as a whole?

Angular2 makes it simple to create a component like this:

@Component({
  selector: 'some',
  properties: ['header']
})
@View({
  template: `
    <div>
      <h2>{{ getFormattedHeader() }}</h2>
      <p><content></content></p>
    </div>
  `
})
class SomeComponent {
  header: string;

  getFormattedHeader() {
    return this.header + '!';
  }
}
<some header="Header Text">Content</some>

If you want to format the content as well, you may wonder about writing a getFormattedContent() function. In that case, what would be the replacement for this.header in the new function?

You might have thought of using format(header) within the template, with a format method that appends a ! to the input string. Is there a way to apply such formatting directly on the content element like format( <content></content> )? Even though handling an actual element rather than a string is a bit more complex, the type of the content (ElementCollection, NodeList) should be considered.

In some cases, putting everything as attributes and leaving the content empty might seem like a workaround, but it's not always aesthetically pleasing (especially due to limitations in defining tags without closing them properly).

Answer №1

Applicable to Angular 2 version 2.0.0-alpha.45

If you want to delve into child elements that are either directives or have variable bindings, this solution will suit your needs:

import {Component, Query QueryList} from 'angular2/angular2';

@Component({
    selector: 'c-item',
    template: '<li><ng-content></ng-content></li>'
})
export class CItem {
}


@Component({
    selector: 'c-container',
    template: '<div><ul><ng-content></ng-content></ul><strong>{{children.length}} items found.</strong></div>',
    directives: [CItem]
})
export class CContainer {
    private children:QueryList<CItem>;

    constructor(@Query(CItem) children:QueryList<CItem>) {
            this.children = children;
    }

    afterContentInit() {
            // now this.children variable is initialized properly
    }
}

Answer №2

Applicable for Angular 2.0.0-alpha.45

You have the option to implement a directive that enables you to access an HTMLElement along with its children. Here is an illustration:

import {Directive, CORE_DIRECTIVES, ElementRef, HTMLElement} from 'angular2/angular2';

@Directive({
selector: '[my-border]',
inputs: [
'definition : my-border' // attribute my-border assigned to definition variable
]
})
export class MyBorder {
private definition:string;
private elementRef : ElementRef;

constructor(elementRef : ElementRef) {
this.elementRef = elementRef;
}

afterContentInit() {
// children variable now properly initialized
let htmlEl:HTMLElement = this.elementRef.nativeElement;
htmlEl.setAttribute('style', 'border:' + this.definition);
}

Subsequently, you can utilize it as demonstrated below:

<span my-border="dashed #00b3ee thin;">This includes my-border directive</span>

The htmlEl in afterContentInit points to the span DOM element. Hence, resulting in:

<span my-border="dashed #00b3ee thin;" style="border:dashed #00b3ee thin;">This includes my-border directive</span>

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