The DOMException occurred when attempting to run the 'querySelector' function on the 'Document' object

Currently, I am engaged in a project that was initiated with bootstrap version 4.3.1.

I have a keen interest in both JavaScript and HTML coding.

<a class="dropdown-item" href="{{ route('user.panel') }}">
        User panel
    </a>

Encountering this error message in the console:

SyntaxError: 'http://localhost:8000/user/panel' is not a valid selector

bootstrap.min.js:6 Uncaught DOMException: Failed to execute 'querySelector' on 'Document': 'http://localhost:8000/user/panel' is not a valid selector. at Object.getSelectorFromElement (http://localhost:8000/themes/js/bootstrap.min.js:6:1466) at http://localhost:8000/themes/js/bootstrap.min.js:6:46766 at Array.map () at n.t.refresh (http://localhost:8000/themes/js/bootstrap.min.js:6:46740) at new n (http://localhost:8000/themes/js/bootstrap.min.js:6:46381)

I have identified that the issue arises due to the dropdown element, causing it not to function as expected. Upon investigation, it was observed that using `href="javascript:void(0);` or `href="#!"` triggers this error, whereas omitting `href` or using `href="#"` ensures proper functionality.

Note: Seeking a resolution with `href="javascript:void(0);`, as opposed to `href="#"`, to maintain aesthetic appeal and prevent page scrolling to the top.

<ul class="navbar-nav"> 
        @guest 
        <li class="navbar-item dropdown">
            <a href="#" class="nav-link" data-toggle="dropdown">Register/Login<i class="fas fa-sort-down"></i></a> 
            <div class="dropdown-menu text-right m-2 position-absolute" style="width:300px;left:-111px;"> 
                <a href="{{ route('login') }}" class="btn btn-primary d-block m-3">Login</a> 
                <span class="m-3">Are you a new user? <a href="{{ route('register') }}" class="link-sign">Sign up</a></span> 
            </div> 
        </li> 
        @else 
          ...
          (The rest of the ul content)
        ...
        @endguest 
    </ul>

An error is surfacing in the line below:

$('body').scrollspy({ 
        target: '#mainNav', 
        offset: 50 
    });

script.js

(function($) { 
        "use strict";
        // Content for script.js

        AOS.init({
            easing: 'ease-in-out-sine'
        });

        $('#logout-button').on('click', function(e) {
            e.preventDefault();
            $('#logout-form').submit();
        });
        
        // Additional functions and logic here
    })(jQuery); // End of use strict

Answer №1

The issue stems from Bootstrap's scrollspy feature, which clearly explains:

Anchors () are required and must point to an element with that id.

Alternatively,

Navbar links must have resolvable id targets. For instance, a

<a
  href="#home">home</a>
should correspond to an element in the DOM like <div id="home">.

You have several solutions:

  1. Modify the scrollspy target from #mainNav to something more specific that does not include .navbar-nav

  2. If you want to track/spy on links inside the .navbar-nav, you will either need to modify the scrollspy source code or use a different component

  3. Keep everything as is, but ensure you use valid local links in anchors.

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