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Collapse navbar toggle

i have a question and that is about my navbar collapse in html. i currently use
http://pastebin.com/s92VvJr6
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav>
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span><i class="fa fa-bars fa-2x" aria-hidden="true"></i></button>
<script>
$(function() {
$('.nav a').on('click', function(){
if($('.navbar-toggle').css('display') !='none'){
$(".navbar-toggle").trigger( "click" );
}
});
});
</script>
<img klass="crab" src="images/crab.png" height="50" width="50">
<a class="navbar-brand" href="">Restaurang MaxLax</a> </div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="menu-collapsed">
<div class="bar"></div>
<div class="collapse navbar-collapse">
<nav>
<ul class="nav navbar-nav">
<li>HOME</li>
<li>MENU</li>
<li>GALLERY
<li>CONTACT</li>
</ul>
</nav>
</div>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container-fluid -->
</nav>
(i don't know how to paste it in here, im new)
when the page goes to 765px width it shows the bar icon. problem is that i can't click on it to toggle down some menus. so my question leads to
Q: How do i write the script so it works will with the code.
would also be great if you can make it for me :) hehe
Mvh Max

So you are using a boostrap navbar without calling the bootstrap js file or the css file for that matter? At least I am not seeing it in your code, and the bootstrap js file should be called directly after the jquery call. Link those two files in from bootstrap and you should have no issue toggling the navbar.
Also as stated this isnt some freelance site that we will just make your code for you. This is a site for you to learn what it is you are doing. If I were you I would edit out that statement pronto or you risk a flurry of downvotes and having the question removed

Bootstrap navbar will disappear when clicking the toggle button on small devices

This is what I have:
<div class="container" style="padding-top: 70px;">
<div id="navbar">
<!-- Fixed navbar -->
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/">
<div class="col-xs-2"><img src="img/favicon.png" alt="Dev Icon" height="20px" width="20px"></div><div class="col-xs-10">FrontEnd Dev</div></a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<?php include('includes/navbar.php'); ?>
</div><!--/.nav-collapse -->
</div>
</nav>
</div>
The <?php include('includes/navbar.php'); ?> just adds the <ul class="nav navbar-nav"> with the <li> tags from another array file.
This issue only happens when the toggle button is available on smaller devices. Clicking on the button does nothing visually (but it does change classes in the code). Clicking the button a few more times will result in the disappearing of the complete navbar. I removed any other css styling that could affect the navbar but is still the same. I use Bootstrap v3.3.7 using the CDN links from the Bootstrap website.

I found the problem. The toggle button has data-target="#navbar" which targets the <div id="navbar" class="navbar-collapse collapse">. I didn't realize that I had all the navbar wrapped up in a ´div´ with the id of navbar. So that's where the conflict was.

How can I set the Menu opacity of a bootstrap navbar menu on scroll?

I am currently working on a Bootstrap-based website, and I wanted to change the opacity of my bootstrap navbar on scroll. I wanted the navbar to become full visible at a height of 500px.
So far so good, I changed the scroll opacity using the following code I found online:
$(document).on('scroll', function (e) {
$('.navbar').css('opacity', ($(document).scrollTop() / 500));
});
My problem is that the navbar scroll opacity works on my website, but when I open my website in mobile view, the bootstrap-hamburger menu does not work.
When I press the button of the hamburger menu, the menu collapses and the hyperlinks are visible. The only problem is that I do not see a background behind those links. I tried editing this in my CSS, but setting an background there does not work, I think due to the scroll opacity script I implemented.
I am sorry for my crappy English, but I hope you understand my problem :)
Edit: Here's my navbar code:
<nav class="navbar navbar-default navbar-fixed-top topnav" role="navigation">
<div class="container topnav">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#collapsemenu">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand topnav" href="#home"><img src="img/logo.png" class="logo"/></a>
</div>
<div class="collapse navbar-collapse" id="collapsemenu" style="padding-top:14px;">
<ul class="nav navbar-nav navbar-right">
<li>
ABOUT
</li>
<li>
WORK
</li>
<li>
TEAM
</li>
<li>
CONTACT
</li>
</ul>
</div>
</div>
</nav>

JS Script preventing bootstrap nav from toggling, why?

I have a website and each page is using a bootstrap toggle/collapse navbar. All the page this works fine except for one. For some reason on one of the pages the navbar collapses once to the appropriate screen size, but it does not drop down. However, I noticed that if I comment out a JS file I have being sourced at the bottom of the html, like so <!--<script src="js/index.js"</script>--> then the drop down works. What's weird is that, 2 of the other pages on the same site source the same JS script, and the dropdown still works...maybe I'm just blind. The code for the nav is as follows :
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="index.html">Home</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li>
Content
</li>
<li>
Content
</li>
<li>
Content
</li>
<li>
Content
</li>
<li>
Content
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div> <!-- /.container -->
</nav>
And there's honestly not a lot of JS, just one scroll function, and another "hover" function that I will probably move over to CSS eventually..
$(document).ready(function() {
$(".business-header img").on("click", function( e ) {
e.preventDefault();
$("body, html").animate({
scrollTop: $(".section-two").offset().top
}, 1500);
});
});
$(".image-wrapper img").mouseenter(function() {
$(this).css("box-shadow", " 0 0 30px #F0DEBD");
}).mouseleave(function() {
$(this).css("box-shadow", "none");
});
I should mention as well that each page has an identical nav. Is there something one of the functions that is causing this? I tried to search this topic on other posts, but was unsuccessful. Cheers

This is, most times, due to bootstrap js library being loaded more than one time

Bootstrap 3 Navbar toggle Not Functioning

My navbar's toggle button refuses to work. The code I'm using has been copied and pasted from a Bootstrap template with a fully functional navbar. I don't know what's up.
<!-- Navigation -->
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header page-scroll">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#page-top">Name</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="navbar-collapse">
<ul class="nav navbar-nav navbar-right">
<li class="hidden">
</li>
<li class="page-scroll">
Home
</li>
<li class="page-scroll">
Downloads
</li>
<li class="page-scroll">
Contact
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container-fluid -->
</nav>
Here's the script tags to the JavaScript and jQuery files. They've been left unmodified.
<!-- jQuery -->
<script src="js/jquery.js" />
<!-- Latest compiled and minified JavaScript -->
<script src="js/bootstrap.js" />

You didn't identify anything to drop down. You need a list of things, using an unordered list. All you have is the names of the buttons. Please see bootstraps example below:
http://getbootstrap.com/components/#btn-dropdowns