Error TS2339: Element of type 'HTMLElement' does no possess the property 'href'

I am encountering an issue where I cannot access the property href of an HTML element. The error message I am receiving is:

Property 'href' does not exist on type 'HTMLElement'.ts(2339)

Below is the code snippet causing the problem:

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements AfterViewInit {
  title = 'clientes-app';

  ngAfterViewInit(){
    (function($) {
        "use strict";
    
        var path = window.location.href; 
            $("#layoutSidenav_nav .sb-sidenav a.nav-link").each(function() {
                if (this.href === path) {
                    $(this).addClass("active");
                }
            });
    
        // Toggle the side navigation
        $("#sidebarToggle").on("click", function(e) {
            e.preventDefault();
            $("body").toggleClass("sb-sidenav-toggled");
        });
    })(jQuery);
  }
}

Answer №1

Ensure to verify if the current element being looped through is a HTMLAnchorElement with an existing href attribute, not all HTMLElements have one.

if (this instanceof HTMLAnchorElement && this.href === path) {
     $(this).addClass("active");
}

Answer №2

This represents the structure of the HTMLElement interface:

interface HTMLElement extends Element, DocumentAndElementEventHandlers, ElementCSSInlineStyle, ElementContentEditable, GlobalEventHandlers, HTMLOrSVGElement {
    accessKey: string;
    readonly accessKeyLabel: string;
    autocapitalize: string;
    dir: string;
    draggable: boolean;
    hidden: boolean;
    innerText: string;
    lang: string;
    readonly offsetHeight: number;
    readonly offsetLeft: number;
    readonly offsetParent: Element | null;
    readonly offsetTop: number;
    readonly offsetWidth: number;
    spellcheck: boolean;
    title: string;
    translate: boolean;
    click(): void;
    addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
    addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
    removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
    removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
}

In this code snippet, there is no mention of the property href. To access the href, you need to utilize the HTMLAnchorElement interface (assuming you are working with an <a> HTML tag). Although HTMLAnchorElement itself does not contain the href property, it inherits it from the HTMLHyperlinkElementUtils interface as shown below:

interface HTMLHyperlinkElementUtils {
    hash: string;
    host: string;
    hostname: string;
    href: string; // This is where the href property is defined
    toString(): string;
    readonly origin: string;
    password: string;
    pathname: string;
    port: string;
    protocol: string;
    search: string;
    username: string;
}

It's important to note that not every HTML element includes the href attribute. I assumed you were working with an anchor tag in my explanation. However, elements like <a>, <link>, <area>, and <base> may have the href property, each requiring a specific interface such as HTMLAnchorElement, HTMLLinkElement, HTMLAreaElement, or HTMLBaseElement.

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