Errors in JavaScript - javascript

I just started with and code education, one of the first assignments is to build a webapplication.
For a good result the code has to run without error, unfortunately my code doens't run without error:
main.js:11 Uncaught TypeError: Cannot read property 'addEventListener' of null
at main.js:11 nextBtn.addEventListener('click',nextSlide);
When I comment this out the next error returns:
main.js:12 Uncaught TypeError: Cannot read property 'addEventListener' of null
at main.js:12
When I comment this out the next error returns:
main.js:27 Uncaught TypeError: Cannot read property 'getcontext' of null
at main.js:27
These errors occured when I got the standard template from bootstrap.
Any help would be appriciated.
I would also like to use jquery for form validation, but $ isn't recognised by Visuals studio code
Regards,
Bas
enter code here https://jsfiddle.net/Basso/vkrogpf6/3/
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link href="CSS/style.css" rel="stylesheet"/>
<title>Eindopdracht WebOntwikkeling</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="Form.html">Formulier</a>
</li>
<li class="nav-item">
<a class="nav-link" href="audio_video.html">Audio Video</a>
</li>
<li class="nav-item">
<a class="nav-link" href="Afbeeldingen.html">Afbeeldingen</a>
</li>
<li class="nav-item">
<a class="nav-link" href="Blog.html">Blog</a>
</li>
<li class="nav-item">
<a class="nav-link" href="Krant.html">Nieuws</a>
</li>
</ul>
</div>
</nav>
<canvas class="myCanvas1"></canvas>
<img id="myImage" src="../Eindopdracht/Images/bcg-3.jpg" alt="palmboom" />
<svg id="mySvg" height="210" width="400">
<path d="M150 0 L75 200 L225 200 Z" />
</svg>
<script src="JS/main.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>
const nextBtn = document.querySelector('.nextBtn');
const prevBtn = document.querySelector('.prevBtn');
nextBtn.addEventListener('click',nextSlide);
prevBtn.addEventListener('click',prevSlide);
function nextSlide(){
document.body.style.backgroundImage = "url('Images/bcg-3.jpg')";
}
function prevSlide(){
document.body.style.backgroundImage = "url('Images/bcg-4.jpg')";
}
var canvas = document.querySelector("myCanvas1");
var ctx = canvas.getcontext("2d");
var img = document.getElementById ("myImage");
ctx.drawImage(img, 0, 0,canvas.width, canvas.height);
enter code here
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<link href="CSS/style.css" rel="stylesheet"/>
<title>Eindopdracht WebOntwikkeling</title>
</head>
<body class="page1">
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="Form.html">Formulier</a>
</li>
<li class="nav-item">
<a class="nav-link" href="audio_video.html">Audio Video</a>
</li>
<li class="nav-item">
<a class="nav-link" href="Afbeeldingen.html">Afbeeldingen</a>
</li>
<li class="nav-item">
<a class="nav-link" href="Blog.html">Blog</a>
</li>
<li class="nav-item">
<a class="nav-link" href="Krant.html">Nieuws</a>
</li>
</ul>
</div>
</nav>
<button type="button" class="btn prevBtn">PrevBtn</button>
<button type="button" class="btn nextBtn">NextBtn</button>
<script src="JS/main.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/jquery-validation#1.19.1/dist/jquery.validate.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>


You do not have a button with nextBtn class... you'll get the same errors on prevBtn.
And since you're trying to add an event listener to non-existant html elements you get these errors.
Add the buttons to your html, or change current button class to nextBtn and you'll be good to go.

Related

Dropdown not worked on bootstrap 5.3

I trying to create navigation bar with bootstrap.
I read the docs from here, but my drop down not working.
I attached everything in the <head> <head/> section but dropdown not worked for me.
This is my code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>НИМХ - АС и БД, Филиал - Пловдив</title>
<!-- index.css -->
<link rel="stylesheet" href="./css/index.css">
<!-- CSS Leaflet-->
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.9.3/dist/leaflet.css"
integrity="sha256-kLaT2GOSpHechhsozzB+flnD+zUyjE2LlfWPgU04xyI="
crossorigin=""/>
<!-- JS Leaflet -->
<script src="https://unpkg.com/leaflet#1.9.3/dist/leaflet.js"
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<script src="https://cdn.jsdelivr.net/npm/#popperjs/core#2.11.6/dist/umd/popper.min.js" integrity="sha384-oBqDVmMz9ATKxIep9tiCxS/Z9fNfEXiDAYTujMAeBAsjFuCZSmKbSSUnQlmh/jp3" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.min.js" integrity="sha384-mQ93GR66B00ZXjt0YO5KlohRA5SY2XofN4zfuZxLkoj1gXtW8ANNCe9d5Y3eG5eD" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" integrity="sha384-w76AqPfDkMBDXo30jS1Sgez6pr3x5MlQ1ZAGC+nuZB+EYdgRZgiwxhTBTkF7CXvN" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg bg-body-tertiary">
<div class="container-fluid">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav me-auto mb-2 mb-lg-0">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
Dropdown
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><hr class="dropdown-divider"></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</li>
<li class="nav-item">
<a class="nav-link disabled">Disabled</a>
</li>
</ul>
<form class="d-flex" role="search">
<input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success" type="submit">Search</button>
</form>
</div>
</div>
</nav>
<div id="map">
<!-- Load map -->
<script src="./js/leaflet.js"></script>
</div>
</body>
</html>
Can I get example with worked dropdown on bootstrap 5.3 ?
I think I have attached all the necessary libraries for the dropdown menu to work ?

You have to add Bootstrap's JavaScript as well:
// Add this line before the closing </body> tag
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" integrity="sha384-w76AqPfDkMBDXo30jS1Sgez6pr3x5MlQ1ZAGC+nuZB+EYdgRZgiwxhTBTkF7CXvN" crossorigin="anonymous"></script>
i.e.
<div id="map">
<!-- Load map -->
<script src="./js/leaflet.js"></script>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" integrity="sha384-w76AqPfDkMBDXo30jS1Sgez6pr3x5MlQ1ZAGC+nuZB+EYdgRZgiwxhTBTkF7CXvN" crossorigin="anonymous"></script>
</body>
</html>

You have included BOOTSTRAP twice!
delete this row from your head tag
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.min.js" integrity="sha384-mQ93GR66B00ZXjt0YO5KlohRA5SY2XofN4zfuZxLkoj1gXtW8ANNCe9d5Y3eG5eD" crossorigin="anonymous"></script>
Working example without it: https://jsfiddle.net/MarinHTML/8kscdbn9/11/
------EDIT----- depricated old answer: ---
you're gonna need some JS to do the job here, because what you did is NEST a dropdown into another dropdown. Not sure if possible by simple bootstrap means. You can, but it must be on hover, and I presume you don't want that.
Here is a quick example of what I think you want:
https://jsfiddle.net/MarinHTML/t7zmqcd9/
And here is the JS to use it:
let dds = document.querySelectorAll('.dropdown-toggle')
dds.forEach((dd)=>{
dd.addEventListener('click', function (e) {
var el = this.nextElementSibling
el.style.display = el.style.display==='block'?'none':'block'
})
})

Bootstrap provides you with several stackblitz links to check their templates, like this: https://stackblitz.com/run?file=index.html
Used on your code would be something like this:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>НИМХ - АС и БД, Филиал - Пловдив</title>
<!-- index.css -->
<link rel="stylesheet" href="./css/index.css">
<!-- CSS Leaflet-->
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.9.3/dist/leaflet.css"
integrity="sha256-kLaT2GOSpHechhsozzB+flnD+zUyjE2LlfWPgU04xyI="
crossorigin=""/>
<!-- JS Leaflet -->
<script src="https://unpkg.com/leaflet#1.9.3/dist/leaflet.js"
integrity="sha256-WBkoXOwTeyKclOHuWtc+i2uENFpDZ9YPdf5Hf+D7ewM="
crossorigin=""></script>
<!-- CSS Bootstrap-->
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GLhlTQ8iRABdZLl6O3oVMWSktQOp6b7In1Zl3/Jr59b6EGGoI1aFkw7cmDA6j6gD" crossorigin="anonymous">
<!-- JS Bootstrap-->
<script src="https://cdn.jsdelivr.net/npm/#popperjs/core#2.11.6/dist/umd/popper.min.js" integrity="sha384-oBqDVmMz9ATKxIep9tiCxS/Z9fNfEXiDAYTujMAeBAsjFuCZSmKbSSUnQlmh/jp3" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg bg-body-tertiary">
<div class="container-fluid">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav me-auto mb-2 mb-lg-0">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
Dropdown
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><hr class="dropdown-divider"></li>
<li><a class="dropdown-item" href="#">Something else here</a></li>
</ul>
</li>
<li class="nav-item">
<a class="nav-link disabled">Disabled</a>
</li>
</ul>
<form class="d-flex" role="search">
<input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success" type="submit">Search</button>
</form>
</div>
</div>
</nav>
<div id="map">
<script src="./js/leaflet.js"></script>
</div>
<!--here -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.bundle.min.js"> </script>
<!-- here -->
</body>
</html>
So all that you are missing is the:
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.3.0-alpha1/dist/js/bootstrap.bundle.min.js"></script>
before the body close tag

My toggle navbar is not working. Can someone help me?

my toggle navbar is not working, can anyone tell me why and how to fix it? I looked at it online but Im still not sure what is the issue in mine.
<!DOCTYPE html>
<html lang="en">
{% load static %}
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script><style>
<title>homepage</title>
</head>
<body>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#MyMenu" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="MyMenu">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="/">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="/sentiment/type">Input Text</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/sentiment/import">Import Tweets</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/feedback">Feedback</a>
</li>
</ul>
</div>
<span class="hello-msg"><strong>Hello, {{request.user}}</strong></span>
<button class="btn btn-danger navbar-btn" ><h7 class="white-text" color=white;>Logout</h7></button>
</nav>
<!-- END nav -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>
Im using navbar from here: https://getbootstrap.com/docs/4.0/components/navbar/

Your syntax is wrong. You have a double body label and double head label.

you have some syntax errors, just simply copy this and replace it with your code:
<!DOCTYPE html>
<html lang="en">
{% load static %}
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<title>homepage</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#MyMenu" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="MyMenu">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="/">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="/sentiment/type">Input Text</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/sentiment/import">Import Tweets</a>
</li>
<li class="nav-item">
<a class="nav-link" href="/feedback">Feedback</a>
</li>
</ul>
</div>
<span class="hello-msg"><strong>Hello, {{request.user}}</strong></span>
<button class="btn btn-danger navbar-btn" ><h7 class="white-text" color=white;>Logout</h7></button>
</nav>
<!-- END nav -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>

navbar (Collapse) button doesn't work Bootstrap 5.1.3

Navbar (Collapse) doesn't work Bootstrap 5
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<head>
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<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary ">
<a class="navbar-brand ps-2" href="#">ICat</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTogglerDemo01">
<ul class="navbar-nav ms-auto pe-5">
<li class="nav-item"><a class="nav-link" href="">Home</a></li>
<li class="nav-item"><a class="nav-link" href="">Contact</a></li>
<li class="nav-item"><a class="nav-link" href="">Fan Page</a></li>
<li class="nav-item"><a class="nav-link" href="">Product</a></li>
</ul>
</div>
</nav>
</body>

I updated your code now it's working.
your bootstrap 5 CSS reference is right but the JS reference is wrong you have to put this js bootstrap cnd for JS <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.1.3/js/bootstrap.min.js" integrity="sha512-OvBgP9A2JBgiRad/mM36mkzXSXaJE9BEIENnVEmeZdITvwT09xnxLtT4twkCa8m/loMbPHsvPl0T8lRGVBwjlQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
<head>
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.1.3/js/bootstrap.min.js" integrity="sha512-OvBgP9A2JBgiRad/mM36mkzXSXaJE9BEIENnVEmeZdITvwT09xnxLtT4twkCa8m/loMbPHsvPl0T8lRGVBwjlQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary ">
<a class="navbar-brand ps-2" href="#">ICat</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTogglerDemo01">
<ul class="navbar-nav ms-auto pe-5">
<li class="nav-item"><a class="nav-link" href="">Home</a></li>
<li class="nav-item"><a class="nav-link" href="">Contact</a></li>
<li class="nav-item"><a class="nav-link" href="">Fan Page</a></li>
<li class="nav-item"><a class="nav-link" href="">Product</a></li>
</ul>
</div>
</nav>
</body>

<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary ">
<a class="navbar-brand ps-2" href="#">ICat</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo01" aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarTogglerDemo01">
<ul class="navbar-nav ms-auto pe-5">
<li class="nav-item"><a class="nav-link" href="">Home</a></li>
<li class="nav-item"><a class="nav-link" href="">Contact</a></li>
<li class="nav-item"><a class="nav-link" href="">Fan Page</a></li>
<li class="nav-item"><a class="nav-link" href="">Product</a></li>
</ul>
</div>
</nav>
<!-- Option 1: Bootstrap Bundle with Popper --> <script src="https://cdn.jsdelivr.net/npm/bootstrap#5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
</body>
</html>
Put a script tag always inside the bottom of the body tag.

Bootstrap toggle button is not working on mobile screen?

I am using Bootstrap but don't know why the toggle button is not working I have searched it on the internet but didn't get the right answer there are many similar questions on the StackOverflow but they are not also solving me problem Like Bootstrap toggle button is not working and bootstrap navbar toggle button is not working
So please can anyone tell me why it is happening.
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"
integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>
<link rel="stylesheet" href="style.css">
<title>TutorInet</title>
</head>
<nav class="navbar navbar-expand-lg navbar-light ">
<div class="container-fluid">
<a style="font-weight: 500;">
<h3 style="color:#4A4A4A;text-transform: uppercase;margin-top:8px;"> Tutor<span
style="color:#F97C44;">I</span>net</h3>
</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="https://www.tutorinet.com/blog.php">Blog</a>
</li>
<li class="nav-item">
<a class="nav-link" href="https://www.tutorinet.com/contact.php">Contact</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">How it works</a>
</li>
<li style="color:#1EB909;font-weight: 600;" class="nav-item">
<a style="color:#1EB909;font-weight: 600;" class="nav-link" href="https://www.tutorinet.com/login.php">Log
in</a>
</li>
<button style="color:white;background: #1EB909;border: none;" type="button" class="btn btn-primary"><a
style="color:white;background: #1EB909;" href="https://www.tutorinet.com/signup.php?type=1">Sign
Up</a></button>
</ul>
</div>
</div>
</nav>

You need to remove the bootstrap script you have and include bootstrap.bundle.min.js
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.1.0/dist/js/bootstrap.bundle.min.js" integrity="sha384-U1DAWAznBHeqEIlVSCgzq+c9gqGAJn5c/t99JyeKa9xxaYpSvHU5awsuZVVFIhvj" crossorigin="anonymous"></script>
also the id value in your div should be the same with data-bs-target value in your button
<div class="collapse navbar-collapse" id="navbarSupportedContent">

Bootstrap Navbar Dropdown Not Working in Browser, Codepen okay

I have a document with a navbar whose dropdown menu just won't work. It works in my codepen, but not through my text-editor(Sublime). I have searched all over for a solution, so here I am.
I have tried:
-Bootstrap Docs
-Making sure jQuery script is before Boostrap script
-Triple checking my closures
-Lots of searching Google and StackOverflow.
-Adding this code:
<script>
$("document").ready(function() {
$(".dropdown").dropdown();
});
</script>
Here's what I believe to be the relevant code. Any insights to my mistake will be greatly appreciated.
<!DOCTYPE html>
<html lang = "en">
<head>
<meta charset = "UTF-8">
<meta http-equiv = "X-UA-Compatible" content = "IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head
content must come *after* these tags -->
<title>JakobiArtWorks</title>
<link href = "https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel = "stylesheet">
<link href = "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel = "stylesheet">
<link href = "https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.css" rel = "stylesheet">
<link href = "https://fonts.googleapis.com/css?family=Russo+One" rel = "stylesheet">
<link href = "style.css" rel = "stylesheet">
</head>
<body>
<header>
<!--nav-->
<nav class="navbar navbar-toggleable-md navbar-light bg-faded" id = "top">
<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="#">JAW</a>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#art">Art</a>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Material
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#wire">Wire</a>
<a class="dropdown-item" href="#clay">Clay</a>
<a class="dropdown-item" href="#plywood">Plywood</a>
<a class = "dropdown-item" href = "#concrete">Concrete</a>
</div>
</li>
</li>
</ul>
<ul class = "nav navbar-nav navbar-right">
<li>Contact</li>
</ul>
</div>
</nav>
<!--end nav-->
</header>
...
<script src = "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<!-- Latest compiled and minified JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src = "https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.js"></script>
<script src = "script.js"></script>
</body>
</html>

The problem is that you use two different versions of bootstrap of bootstrap. In your header you use the CSS of Bootstrap 4.0.0-alpha.6 and on the end of your body you have the JavaScript of version 3.3.7. You can either use one or the other but not both together.
This code works for me:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head
content must come *after* these tags -->
<title>JakobiArtWorks</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css"
integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<link href="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.css" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Russo+One" rel="stylesheet">
<link href="style.css" rel="stylesheet">
</head>
<body>
<header>
<!--nav-->
<nav class="navbar navbar-toggleable-md navbar-light bg-faded" id="top">
<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse"
data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false"
aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="#">JAW</a>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#art">Art</a>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink"
data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Material
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#wire">Wire</a>
<a class="dropdown-item" href="#clay">Clay</a>
<a class="dropdown-item" href="#plywood">Plywood</a>
<a class="dropdown-item" href="#concrete">Concrete</a>
</div>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li>Contact</li>
</ul>
</div>
</nav>
<!--end nav-->
</header>
...
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"
integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"
integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb"
crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"
integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.js"></script>
<script src="script.js"></script>
</body>
</html>

well you have extra </li> after <a class = "dropdown-item" href = "#concrete">Concrete</a> reomove it. and in your script dropdown-toggle should be pointed
WRONG
$("document").ready(function() {
$(".dropdown").dropdown();
});
remove "" in document and .dropdown it should be written like this
CORRECT
$(document).ready(function() {
$(".dropdown-toggle").dropdown();
});
Demo With your code

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