This Angular component, ResultsComponent, displays search results, fetching them from a service and using Prism.js to highlight code snippets within each result.

Run example

npm run import -- "Display code results"

Display code results

import {SearchService} from '../../../imports/search.service';
import {ChangeDetectorRef, Component, OnDestroy, OnInit} from '@angular/core';
import {Subscription} from 'rxjs/Subscription';
import * as Prism from 'prismjs';

@Component({
    selector: 'bc-results',
    template: `
        <pre [class]="'language-'+(r.lang||'javascript')" *ngFor="let r of results" [innerHTML]="highlight(r.code)">
        </pre>
    `,
    styleUrls: ['./results.component.scss']
})
export class ResultsComponent implements OnInit, OnDestroy {
    query = '';
    results: Array<any> = [];
    private resultsSub: Subscription;
    

    constructor(public service: SearchService, public ref: ChangeDetectorRef) {}

    ngOnInit(): void {
        this.resultsSub = this.service.results(this.query).subscribe(r => {
            this.results = [(r as Array < any >)[0]];
            this.ref.detectChanges();
        });
    }

    ngOnDestroy(): void {
        this.resultsSub.unsubscribe();
    }

    highlight(code: string): string {
        return Prism.highlight(code, Prism.languages.javascript);
    }
}

import { SearchService } from '../../../imports/search.service';
import { Component, OnDestroy, OnInit } from '@angular/core';
import { Subscription } from 'rxjs';
import * as Prism from 'prismjs';

@Component({
    selector: 'bc-results',
    template: `
        
        
    `,
    styleUrls: ['./results.component.scss']
})
export class ResultsComponent implements OnInit, OnDestroy {
    query = '';
    results: any[] = [];

    constructor(private service: SearchService, private ref: ChangeDetectorRef) { }

    ngOnInit(): void {
        // Subscribe to search results observable
        const resultsSub = this.service.results(this.query).subscribe((data: any[]) => {
            // Handle successful data response
            if (data && data.length > 0) {
                this.results = data;
                this.ref.detectChanges();
            } else {
                // Handle empty or no data response
                console.error('No results found for the given query.');
            }
        }, (error: any) => {
            // Handle observable error
            console.error('Error fetching search results:', error);
        });

        // Store subscription for later use
        this.resultsSub = resultsSub;
    }

    ngOnDestroy(): void {
        // Unsubscribe from observable to prevent memory leaks
        this.resultsSub.unsubscribe();
    }

    /**
     * Highlights the given code snippet using PrismJS
     * @param code Code snippet to highlight
     */
    highlight(code: string): string {
        return Prism.highlight(code, Prism.languages.javascript);
    }
}

This code defines an Angular component called ResultsComponent that displays search results, highlighting code snippets.

Here's a breakdown:

1. Imports:

   • Imports SearchService, Angular core modules (Component, OnInit, OnDestroy, ChangeDetectorRef), Subscription from RxJS, and Prism for code highlighting.

2. ResultsComponent:

   • Declares a component with a template that iterates over an array of results and displays each result as a preformatted code block with syntax highlighting.
   • The highlight() method uses Prism to highlight the code.

3. Constructor:

   • Injects SearchService and ChangeDetectorRef.

4. ngOnInit():

   • Subscribes to the results observable from SearchService and updates the results array when new data arrives.
   • Uses ChangeDetectorRef.detectChanges() to trigger change detection.

5. ngOnDestroy():

   • Unsubscribes from the observable to prevent memory leaks.

Let me know if you have any other code snippets you'd like me to explain!