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WordPress JS Loading Issues with Bootstrap and Popper

There seems to be something wacky going on with scripts as they load causing issues. I have this:
function fyxt_custom_scripts() {
wp_enqueue_script('jquery');
//load order is important (from website jquery, popper, bootstrap)
wp_register_script('prefix_bootstrap', '//stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js', array( 'jquery' ),'',true );
wp_enqueue_script('prefix_bootstrap');
}
add_action( 'wp_enqueue_scripts', 'fyxt_custom_scripts' );
I am getting the following console error:
Uncaught TypeError: Bootstrap's tooltips require Popper.js (https://popper.js.org/)
So I add in the following to WordPress getting popper in there.
function fyxt_custom_scripts() {
wp_enqueue_script('jquery');
//popper for bootstrap
wp_register_script( 'popper','https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js', array( 'jquery' ),'',true );
wp_enqueue_script( 'popper' );
//load order is important (from website jquery, popper, bootstrap)
wp_register_script('prefix_bootstrap', '//stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js', array( 'jquery' ),'',true );
wp_enqueue_script('prefix_bootstrap');
}
add_action( 'wp_enqueue_scripts', 'fyxt_custom_scripts' );
Once that is in it loads popper in. But now I am getting another error. Any idea why?
tooltip.js:559 Uncaught TypeError: this.element.getAttribute is not a function
at i.t._fixTitle (tooltip.js:559)
at i.t._setListeners (tooltip.js:554)
at new i (tooltip.js:142)
at i.t._enter (tooltip.js:576)
at HTMLDocument.<anonymous> (tooltip.js:528)
at HTMLDocument.handle (jquery.js?ver=1.12.4-wp:3)
at HTMLDocument.dispatch (jquery.js?ver=1.12.4-wp:3)
at HTMLDocument.r.handle (jquery.js?ver=1.12.4-wp:3)
So it seems like tooltip is recognized but says it needs popper. But then it gets it and tooltip errors out. What is going on here?
I tried a couple solutions and nothing is working. I think this has to do with load order/dependencies. Here is the loading script in full.
function fyxt_custom_scripts() {
wp_enqueue_style( 'jquery-custom', plugin_dir_url( __FILE__ ) . '../css/fyxt-theme-2/jquery-ui-1.10.4.custom.css' );
wp_enqueue_style( 'jquery-custom', plugin_dir_url( __FILE__ ) . '../css/fyxt-theme-2/jquery-ui-1.10.4.custom.min.css' );
wp_enqueue_script( 'jquery' );
wp_enqueue_script( 'jquery-ui-core' );
wp_enqueue_script( 'jquery-ui-tabs' );
wp_enqueue_script( 'jquery-ui-button' );
wp_enqueue_script( 'jquery-ui-accordion' );
wp_enqueue_script( 'jquery-ui-slider' );
wp_enqueue_script( 'jquery-ui-core' );
wp_enqueue_script( 'jquery-ui-widget' );
wp_enqueue_script( 'jquery-ui-progressbar' );
wp_enqueue_script( 'jquery-ui-sortable' );
wp_enqueue_script( 'jquery-ui-autocomplete' ); //for tags, use later for generators (powers, effects, etc)
wp_enqueue_script( 'tabs-script', plugin_dir_url( __FILE__ ) . '../js/tabs.js', array('jquery-ui-core', 'jquery-ui-accordion', 'jquery-ui-tabs') );
wp_enqueue_script( 'tags-script', plugin_dir_url( __FILE__ ) . '../js/tagmanager-master/tagmanager.js', array(), '', false );
wp_enqueue_style( 'tags-custom', plugin_dir_url( __FILE__ ) . '../js/tagmanager-master/tagmanager.css' );
//plupload
wp_enqueue_script( 'plupload-full', plugin_dir_url( __FILE__ ) . '../js/plupload.full.min.js', array(), '', false );
wp_enqueue_script( 'plupload-scripts', plugin_dir_url( __FILE__ ) . '../js/jquery.ui.plupload/jquery.ui.plupload.min.js', array(), '', false );
wp_enqueue_style( 'plupload-css', plugin_dir_url( __FILE__ ) . '../js/jquery.ui.plupload/css/jquery.ui.plupload.css' );
//popper for bootstrap
wp_register_script( 'popper','https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js', array( 'jquery' ),'', false );
wp_enqueue_script( 'popper' );
//bootstrap
wp_register_style('prefix_bootstrap', '//stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css');
wp_enqueue_style('prefix_bootstrap');
//load order is important (from website jquery, popper, bootstrap)
wp_register_script('prefix_bootstrap', '//stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js', array( 'popper' ),'', false );
wp_enqueue_script('prefix_bootstrap');
}
add_action( 'wp_enqueue_scripts', 'fyxt_custom_scripts' );
If the 'tabs-script' is included I get the error, jquery buttons are all broken. Tabs and accordions work.
tooltip.js:568 Uncaught TypeError: this.element.getAttribute is not a function
at i.t._fixTitle (tooltip.js:568)
at i.t._setListeners (tooltip.js:563)
at new i (tooltip.js:140)
at HTMLDocument.<anonymous> (tooltip.js:767)
at Function.each (jquery.js?ver=1.12.4-wp:2)
at a.fn.init.each (jquery.js?ver=1.12.4-wp:2)
at a.fn.init.i._jQueryInterface [as tooltip] (tooltip.js:758)
at HTMLDocument.<anonymous> (tabs.js?ver=ec6af3c620057499034adb106af5aae1:10)
at i (jquery.js?ver=1.12.4-wp:2)
at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4-wp:2)
at Function.ready (jquery.js?ver=1.12.4-wp:2)
at HTMLDocument.J (jquery.js?ver=1.12.4-wp:2)
If I comment out the 'tabs-script' I get the jquery buttons to work but then it breaks tabs and accordion.
jquery.ui.plupload.min.js?ver=ec6af3c620057499034adb106af5aae1:1 Uncaught TypeError: i.widget is not a function
at jquery.ui.plupload.min.js?ver=ec6af3c620057499034adb106af5aae1:1
at jquery.ui.plupload.min.js?ver=ec6af3c620057499034adb106af5aae1:1
I am not to familiar with load orders and dependencies so advice here would be great. Thanks so much for the help!

What I do is respect the URLs that Bootstrap provide to me (https://getbootstrap.com/docs/4.4/getting-started/introduction/):
https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css
https://cdn.jsdelivr.net/npm/popper.js#1.16.0/dist/umd/popper.min.js
https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js
Then in my function I just include the references that I need:
function fyxt_custom_scripts(){
wp_register_style(('prefix_bootstrap', 'https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css', array(), '4.4.1', 'all');
wp_register_script('popper', 'https://cdn.jsdelivr.net/npm/popper.js#1.16.0/dist/umd/popper.min.js', array( 'jquery' ),'1.16.0', true );
wp_register_script('prefix_bootstrap', 'https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js', array( 'jquery', 'popper' ),'4.4.1', true );
}
add_action( 'wp_enqueue_scripts', 'fyxt_custom_scripts' );
I follow Bootstrap recomendations and place the scripts call in the footer.
After that make sure that you have the calls to the functions
<?php get_header() ?> and <?php get_footer() ?> between the <head>...</head> HTML tags and just before </body> HTML tag respectivelly in your theme.

It seems that PLUpload was the one causing the issues. I tried many different configurations and load orders and it always seemed to break with plupload. I have decided not to use it and instead go with another similar plugin, Dropzone. PLupload has not been updated in a few years so think it is better to go with a more recently updated/modern style anyway. Thank you all for your tips and suggestions.

You should move all the JS scripts into the footer. I hope it would help you out. Please have a look below:
function fyxt_custom_scripts() {
}
add_action( 'wp_footer', 'fyxt_custom_scripts' );

Why does wp_enqueue_style doesn't work here?

I'm developing a theme on WordPress. My index.php and style.css are in the same folder, at the root of the theme directory. My css files are in a "css" folder, my js files are in "js" folder. I want to add the CSS and JS to the index ( with the wp enqueue style/script ) in the functions.php file
add_action( 'wp_enqueue_scripts', 'add_stylesheet' );
function add_stylesheet() {
wp_register_style('style', get_template_directory_uri() . '/style.css');
wp_register_style('plugins', get_template_directory_uri() . '/css/plugins.css');
wp_register_style('nav', get_template_directory_uri() . '/css/navigation-menu.css');
wp_register_style('shortcode', get_template_directory_uri() . '/css/shortcodes.css');
wp_enqueue_style('style');
wp_enqueue_style('plugins');
wp_enqueue_style('nav');
wp_enqueue_style('shortcode');
}
But that doesn't work.
I tried with a 'if' condition, I tried with just the wp_enqueue_style function ( and many other solutions I found on google ), but none of these work. I have no idea what the problem is.
Here's a screenshot of the file tree
Edit : It doesn't work as in the css is not linked to the php files, it shows plain HTML text. If I open the dev tools, it shows no CSS properties.
Like that
Thanks !

The main difference between wp_enqueue_* and respective wp_register_* functions, is that the first adds scripts/styles to the queue and the second prepares scripts/styles to be added.
You need to move the add action after the function and it'll work:
function add_stylesheet() {
wp_register_style('style', get_template_directory_uri() . '/style.css');
wp_register_style('plugins', get_template_directory_uri() . '/css/plugins.css');
wp_register_style('nav', get_template_directory_uri() . '/css/navigation-menu.css');
wp_register_style('shortcode', get_template_directory_uri() . '/css/shortcodes.css');
wp_enqueue_style('style');
wp_enqueue_style('plugins');
wp_enqueue_style('nav');
wp_enqueue_style('shortcode');
}
add_action( 'wp_enqueue_scripts', 'add_stylesheet' );
Updated answer below:
Why not just enqueue the styles instead of registering and then enqueuing them, like this:
function theme_scripts()
{
wp_enqueue_style('style', get_template_directory_uri() . '/style.css');
wp_enqueue_style('style', get_template_directory_uri() . 'wp_enqueue_style('plugins', get_template_directory_uri() . '/style.css');');
}
add_action('wp_enqueue_scripts', 'theme_scripts');

Adding Multiple Javascript files to Wordpress functions.php

I have managed to add one js file to the WP functions.php and this works fine. How do I add another? e.g add classie.js to the add_my_script function? I tried to duplicate the get_template_directory_uri() but this didn't work - I feel as though the answer is staring me in the face!
add_action( 'wp_enqueue_scripts', 'add_my_script' );
function add_my_script() {
wp_enqueue_script(
'slicknav',// name your script so that you can attach other scripts and de-register, etc.
get_template_directory_uri() . '/js/jquery.slicknav.min.js', // this is the location of your script file
array('jquery') // this array lists the scripts upon which your script depends
);
}

You need to call the wp_enqueue_script twice:
add_action( 'wp_enqueue_scripts', 'add_my_script' );
function add_my_script() {
wp_enqueue_script(
'slicknav',
get_template_directory_uri() . '/js/jquery.slicknav.min.js',
array('jquery')
);
wp_enqueue_script(
'classie',
get_template_directory_uri() . '/js/classie.js',
array('jquery')
);
}

WP - difficulty with enqueueing scripts

I am trying to add javascript files with wp_enqueue_script. The scripts do not seem to load at all in the page. What I have is::
function uberpasscode_scripts() {
wp_enqueue_script( 'bootstrap', get_template_directory_uri() . "/assets/js/bootstrap.min", array('jquery'));
wp_enqueue_script( 'jquery', get_template_directory_uri() . "/assets/js/jquery-1.11.1.min" );
}
add_action( 'wp_enqueue_scripts', 'uberpasscode_scripts' );

This is because you are missing the javascript (js) extension after .min.
function uberpasscode_scripts() {
wp_enqueue_script( 'bootstrap', get_template_directory_uri() . "/assets/js/bootstrap.min.js", array('jquery'),'', true );
wp_enqueue_script('jquery');
}
add_action( 'wp_enqueue_scripts', 'uberpasscode_scripts' );
Try adding those two parameters. Also, that version of jQuery you are trying to load is too old for bootstrap. Just use the jQuery built into WordPress. Also, make sure that you are putting this into functions.php
If this is still not working, please make sure you have the <?php wp_footer(); ?> function in your footer.php file.
<?php wp_footer(); ?>
</body>
</html>

How to load bootstrap script and style in functions.php (wordpress)?

I converted bootstrap theme to wordpress. Now, I have a problem in loading the bootstrap scripts and style.
This is my code in functions.php
function wpbootstrap_scripts_with_jquery()
{
// Register the script like this for a theme:
wp_register_script( 'custom-script', get_template_directory_uri() . '/js/bootstrap.js', array( 'jquery' ) );
wp_enqueue_script( 'samplejs', get_template_directory_uri() . '/js/jquery.min.js', array( '' ) );
wp_enqueue_script( 'samplejs', get_template_directory_uri() . '/js/clean-blog.min.js', array( '' ) );
// For either a plugin or a theme, you can then enqueue the script:
wp_enqueue_script( 'custom-script' );
}
add_action( 'wp_enqueue_scripts', 'wpbootstrap_scripts_with_jquery' );
and i add this in my header
<?php wp_enqueue_script("jquery"); ?>
Additional question:
What is the difference between wp_register and wp_enqueue?
Please help me. Im beginner in using bootstrap.

All you need to do is enqueue them. Also, I recommend getting rid of your jquery import (the second wp_enqueue). WordPress includes jQuery by default, and you're already including it in the first script (because you have listed it as a dependency). Here's an example, but this enqueues jquery twice (the native jquery, and the bootstrap jquery):
function wpbootstrap_scripts_with_jquery()
{
// Register the script like this for a theme:
wp_enqueue_script( 'custom-script', get_stylesheet_directory_uri() . '/js/bootstrap.js', array( 'jquery' ) );
wp_enqueue_script( 'bootstrap-jquery', get_stylesheet_directory_uri() . '/js/jquery.min.js' );
wp_enqueue_script( 'blog-scripts', get_stylesheet_directory_uri() . '/js/clean-blog.min.js' );
}
add_action( 'wp_enqueue_scripts', 'wpbootstrap_scripts_with_jquery' );
The only reason you'd need to register the scripts before enqueue-ing them, is if one of the scripts is a dependency. From the docs:
wp_register_script() registers a script file in WordPress to be linked
to a page later using the wp_enqueue_script() function, which safely
handles the script dependencies.
Scripts that have been pre-registered using wp_register_script() do
not need to be manually enqueued using wp_enqueue_script() if they are
listed as a dependency of another script that is enqueued. WordPress
will automatically include the registered script before it includes
the enqueued script that lists the registered script's handle as a
dependency.

you cas use "wp_enqueue_style" and "wp_enqueue_script".
for example:
function reg_scripts() {
wp_enqueue_style( 'bootstrapstyle', get_template_directory_uri() . '/css/bootstrap.min.css' );
wp_enqueue_style( 'bootstrapthemestyle', get_template_directory_uri() . '/css/bootstrap-theme.min.css' );
wp_enqueue_script( 'bootstrap-script', get_template_directory_uri() . '/js/bootstrap.min.js', array(), true );
}
add_action('wp_enqueue_scripts', 'reg_scripts');