Issue with Inline JS not functioning correctly in Flask when integrated with Bootstrap 5

I'm developing a Flask web app with Bootstrap 5 and attempting to incorporate inline JS, but it's not functioning as expected.

Specifically, I'm trying to use a simple alert() component, but nothing is displaying on the page.

Interestingly, when I run the same code in the Chrome console, it works perfectly fine.

Here's a snippet of my code:

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Favicon -->
    <link rel="icon" type="image/x-icon" href="{{ url_for('static', filename='images/favicon.png') }}">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="32505d5d46414640534272071c021c00">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous"&g

    <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>

    

    <title>
        {% block title %}

        {% endblock %}
    </title>

  </head>
  <body>
            
    <svg xmlns="http://www.w3.org/2000/svg" style="display: none;">
      <symbol id="check-circle-fill" fill="currentColor" viewBox="0 0 16 16">
        <path d="M16 8A8 8 0 1 1 0 8a8 8 0 0 1 16 0zm-3.97-3.03a.75.75 0 0 0-1.08.022L7.477 9.417 5.384 7.323a.75.75 0 0 0-1.06 1.06L6.97 11.03a.75.75 0 0 0 1.079-.02l3.992-4.99a.75.75 0 0 0-.01-1.05z"/>
      </symbol>
      <symbol id="info-fill" fill="currentColor" viewBox="0 0 16 16">
        <path d="M8 16A8 8 0 1 0 8 0a8 8 0 0 0 0 16zm.93-9.412-1 4.705c-.07.34.029.533.304.533.194 0 .487-.070686c-.287.346 

       alert("Hello world - Alert");
     });
     </script>
    
    

    </body>
</html>

Upon loading the page, no content is displayed. Can anyone provide some assistance?

javascriptflaskjinja2bootstrap-5

Answer №1

The language attribute found in the script element was never officially standardized, so it is advised not to use it. Instead, opt for the type attribute or consider omitting it altogether.

<script type="text/javascript">
  $(document).ready(function(){
    console.log('TEST')
    alert("Hello world - Alert")
  });
</script>

Answer №2

Success! I was able to solve my issue, although the cause remains a mystery.

Prior to this, the javascript code was placed outside of the blocks.

{% extends 'base.html' %}

{% block content %}
   ...
   ...
{% endblock %}

<script type="text/javascript">
    $(document).ready(function(){
        $("#form-submit-btn").click( function(e){
    ...
    ...
</script>

By relocating the javascript code inside the blocks, everything started working smoothly.

{% extends 'base.html' %}

{% block content %}
   ...
   ...
<script type="text/javascript">
    $(document).ready(function(){
        $("#form-submit-btn").click( function(e){
    ...
    ...
</script>
{% endblock %}

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