There seems to be an issue with Bootstrap: the property this._config is

Here is the button I have:

<button class="kv_styleclass_0 btn btn-outline-success btn-lg" 
    data-bs-toggle="modal" 
    data-bs-target="formModal" 
    type="button">
        Become a participant
</button>

that activates the modal dialog below:

<div class="modal fade" 
    aria-labelledby="formModal_label" 
    aria-hidden="true" 
    id="formModal" 
    tabindex="-1">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title" 
                        id="formModal_label">
                            Participant Form
                    </h5>
                    <button class="btn btn-secondary btn-primary" 
                        data-bs-dismiss="modal" 
                        type="button">
                            Close
                    </button>
                </div>
                <div class="modal-body">
                    <iframe src="..." 
                        name="..." 
                        style="height: 407px;" 
                        width="650" 
                        frameborder="0">
                    </iframe>
                </div>
            </div>
        </div>
    </div>

Upon clicking the button, I encountered the following error:

Uncaught TypeError: this._config is undefined
    _initializeBackDrop bootstrap.esm.js:2916
    ...

I am utilizing NPM to obtain Bootstrap. Specifically, Bootstrap v5.2.3.

I experimented with getting Bootstrap JS by inserting the <script> tag in various locations within my code. This was done in conjunction with Popper.JS.

javascripthtmlcssbootstrap-modalbootstrap-5

Answer №1

Dealing with the same problem, I managed to resolve it by simply adding a # to the data-bs-target. Here is the updated code snippet:

<button class="kv_styleclass_0 btn btn-outline-success btn-lg" 
    data-bs-toggle="modal" 
    data-bs-target="#formModal" 
    type="button">
        Become a member
</button>

It appears that a string is being passed where an id is expected for the data-bs-target attribute.

UPDATE: I just noticed that CodeCaster mentioned this in a comment before me. My bad!

Answer №2

While reviewing some code that was copied and pasted by another developer, I came across the same JavaScript exception. The code snippet looked like this:

<a type="button" onclick="fn()" data-bs-dismiss="modal">text</a>

This code snippet was placed inside a <div> that was not actually a Bootstrap modal. Surprisingly, clicking on the button still worked fine (the JavaScript function fn was executed as intended), but it also triggered an exception. This was likely due to the Bootstrap JavaScript attempting to locate a modal that did not exist.

To resolve this issue, I opted to simply remove the problematic data-bs-dismiss attribute altogether.

Answer №3

<button class="custom-style btn btn-outline-primary btn-lg" 
  data-bs-target="registerModal" 
  type="button">
    Join now
</button>

To fix the issue, make sure to delete the following attribute from your button tag: data-bs-toggle="modal". After removing it, test your application; the problem should be resolved.

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