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Fixed Navbar stops from scrolling

I'm using the below function to make a fixed navbar. However, at a certain height (when almost the whole page is showing but it has scroll) it prevents the page from scrolling and the page resists to scroll. I want the navbar to be sticky but not stop the page from scrolling at a certain height. any help will be highly appreciated. Thanks
HTML:
<nav id="navbar_2" class="navbar navbar-default navbar-static-top">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle navbar-toggle-sidebar collapsed">
MENU
</button>
<a class="navbar-brand" href="#"><img src="https://cdn2.vectorstock.com/i/1000x1000/19/11/wi-fi-hotspot-icon-flat-design-vector-14071911.jpg" class="img-responsive" alt="Logo" align="center" ><br><br></a>
<!--<span class="navbar-text"><img src="" width=20% height=20%></span>
--><!--<img src="https://cdn2.vectorstock.com/i/1000x1000/23/56/mobile-phone-icon-vector-2382356.jpg" width="40px" height="50px" id=mobile_info4 style="margin: 15px -330px;"/>
-->
<span class="navbar-text" id=mobile_info style="font-size: 12px;">
<%= address %><br>
<%= manufacturer %><br>
<%= model %><br>
</span>
<a class="navbar-brand" href="#" hidden>
Administrator
</a>
<button type="button" class="navbar-toggle collapsed" 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>
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-2">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<form class="navbar-form navbar-left" method="GET" role="search" >
<div class="form-group">
<input type="text" name="q" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default"><i class="glyphicon glyphicon-search"></i></button>
</form>
<ul class="nav navbar-nav navbar-right">
<li><a href="/index/<%= role %>/<%= _id %>/<%= token %>" >Home</a></li>
<!--<li class="dropdown">-->
<li><a href="/logout" >Logout</a></li>
<!-- <li><a href="/test2" >Testing Page</a></li>
-->
<!--<a href="/logout" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="true">-->
</ul>
<!--<ul class="dropdown-menu" role="menu">
<li class="dropdown-header">SETTINGS</li>
<li class="divider"></li>
<li>Logout</li>
</ul>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
Javascript:
$(document).ready(function() {
var $navbar = $("#navbar_2");
AdjustHeader(); // Incase the user loads the page from halfway down (or something);
$(window).scroll(function() {
AdjustHeader();
});
function AdjustHeader(){
if ($(window).scrollTop() > 60) {
if (!$("#navbar_2").hasClass("navbar-fixed-top")) {
$("#navbar_2").addClass("navbar-fixed-top");
$('body').css('padding-top', $('.navbar').outerHeight() + 'px');
}
} else {
$("#navbar_2").removeClass("navbar-fixed-top");
$('body').css('padding-top', '0');
}
}
});
CSS:
#navbar_2 a {
float: left;
display: block;
text-align: center;
padding: 14px 16px;
text-decoration: none;
font-size: 17px;
}

how to make head of dropdown link clickable in navbar

I want to make the dropdown items appear on hover of the parent link, and to be clickable to a another page, how can this be done?
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<!-- 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="#app-nav" aria-expanded="false">
<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 navbar-link" href="#"> <img src="assets/img/Saydullogo.png" id="logo"></a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="app-nav">
<ul class="nav navbar-nav navbar-right">
<li class="active"><span class="fa fa-home"></span> Home</li>
<li class="dropdown">
<span class="fa fa-medkit"></span> Categories <span class="caret"></span>
<ul class="dropdown-menu">
<li>Beauty</li>
<li>Cosmetics</li>
<li>Medicines</li>
</ul>
</li>
<li><span class="fa fa-edit"></span> Registeration</li>
<li><span class="fa fa-phone-square"></span> Contact Us</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>

put this css in your code
.dropdown:hover .dropdown-menu {
display: block !important;
}
check out this snippet with your code
.dropdown:hover .dropdown-menu {
display: block;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<!-- 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="#app-nav" aria-expanded="false">
<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 navbar-link" href="#"> <img src="assets/img/Saydullogo.png" id="logo"></a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="app-nav">
<ul class="nav navbar-nav navbar-right">
<li class="active"><span class="fa fa-home"></span> Home</li>
<li class="dropdown">
</span> Categories <span class="caret"></span>
<ul class="dropdown-menu">
<li>Beauty</li>
<li>Cosmetics</li>
<li>Medicines</li>
</ul>
</li>
<li><span class="fa fa-edit"></span> Registeration</li>
<li><span class="fa fa-phone-square"></span> Contact Us</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>

this.girish - that code works perfectly.

Bootstrap navbar doesnt hide after click

How to change data-offset-top for mobile view? Also, on click link doesn't hide the menu. I tried some founded code from stackoverflow but no luck. Could someone please help with this link below :
http://smalldesigncompany.com/client/agami/s4/index.html
<nav class="navbar navbar-default zero-mar" >
<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=".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>
</div><!--NAVBAR-HEADER-->
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1 pull-left">
<ul class="nav navbar-nav">
<li>
<a class="scroll" href="#top">Home</a>
</li>
<li>
<a class="scroll" href="#people">Meet Our People</a>
</li>
<li>
<a class="scroll" href="#projects">Our Capabilities</a>
</li>
<li>
<a class="scroll" href="#process">Our Process</a>
</li>
<li>
<a class="scroll" href="#why">Why Agami</a>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><span class="right">Projects</span></li>
<li><span class="right">Contact</span></li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
</nav>

This answer might make think I oversimplify the thing, but often I see jquery/bootstrap scripts loaded twice, and that means two listeners waiting for the button toggle. The first one opens, the second one closes instantly.
Solution: look for scripts loaded twice via browser inspecting (F12) and remove where is convenient.

try this way
$('.navbar-nav a').on('click', function () {
$(".navbar-toggle").click() //bootstrap 3.x
});

Never use multiple IDs on same div
And for the navbar-toggle just use ID of your navbar-collapse menu in the data-target attribute of the navbar-toggle as:
data-target="#bs-example-navbar-collapse-1"
And for hiding the navbar-collapse menu again you have to trigger the click of your navbar-toggle button on the click of .navbar-nav > li > a as:
Code Snippet
$('.navbar-nav > li > a').on('click', function() {
$('.navbar-toggle').trigger('click');
});
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<nav class="navbar navbar-default zero-mar">
<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">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!--NAVBAR-HEADER-->
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse pull-left" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li>
<a class="scroll" href="#top">Home</a>
</li>
<li>
<a class="scroll" href="#people">Meet Our People</a>
</li>
<li>
<a class="scroll" href="#projects">Our Capabilities</a>
</li>
<li>
<a class="scroll" href="#process">Our Process</a>
</li>
<li>
<a class="scroll" href="#why">Why Agami</a>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><span class="right">Projects</span>
</li>
<li><span class="right">Contact</span>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
</nav>

$('.navbar-nav > li > a').on('click', function() {
$('.navbar-toggle').trigger('click');
});
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
<nav class="navbar navbar-default zero-mar">
<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">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!--NAVBAR-HEADER-->
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse pull-left" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li>
<a class="scroll" href="#top">Home</a>
</li>
<li>
<a class="scroll" href="#people">Meet Our People</a>
</li>
<li>
<a class="scroll" href="#projects">Our Capabilities</a>
</li>
<li>
<a class="scroll" href="#process">Our Process</a>
</li>
<li>
<a class="scroll" href="#why">Why Agami</a>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><span class="right">Projects</span>
</li>
<li><span class="right">Contact</span>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
</nav>

Bootstrap navbar toggle use to add class

I use Bootstrap V3 in Wordpress.
What I want to achieve is that when someone clicks the button in the collapsed navbar menu, the div with the class .slider gets a extra class.
This is the HTML from the navbar:
<nav class="navbar navbar-default navbar-static-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="collapse navbar-collapse" id="navbar">
<?php
wp_nav_menu( array(
'theme_location' => 'navbar-right',
'depth' => 2,
'menu_class' => 'nav navbar-nav navbar-right',
'fallback_cb' => 'wp_bootstrap_navwalker::fallback',
'walker' => new wp_bootstrap_navwalker())
);
?>
</div><!-- /.navbar-collapse -->
</div><!-- /.container -->
</nav>
And this is the HTML from the div where I want to add a extra class:
<div class="slider">
<div class="container">
<div class="row">
other elements
</div> <!-- close row -->
</div> <!-- close container -->
</div> <!-- close slider -->
I've tried this with CSS:
.navbar-default .navbar-collapse .in ~ .slider{
margin-top: -246px;
padding-top: 176px;
}
And this with jQuery:
$(function() {
$("#navbar").click(function() {
$(".slider").addClass("sliderMove");
});
});
The extra class that should be added on slider is:
.sliderMove{
margin-top: -246px;
padding-top: 176px;
}
The purpose of this is that the slider that is after/under the navbar stay's under the navbar when it collapsed.

You just need to hook into the Bootstrap collapse event of your collapsible navbar. There is no need to assign an extra click handler to the collapse nav button.
Collapse Events
Bootstrap's collapse class exposes a few events for hooking into collapse functionality.
Here is an example.
$('#bs-example-navbar-collapse-1').on('show.bs.collapse', function () {
$(".slider").addClass("your-class");
})
$('#bs-example-navbar-collapse-1').on('hide.bs.collapse', function () {
$(".slider").removeClass("your-class");
})
.slider {
width: 100%;
min-height: 100px;
background-color: tomato;
}
.your-class {
background-color: lawngreen;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- 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>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li>Link <span class="sr-only">(current)</span></li>
</ul>
</div>
</div>
</nav>
<div class="slider"></div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

The button you are are willing to click is having a class navbar-toggle and the div having navbar has an id navbar . So to achieve the click event on button you have to use the button id not the div id. So your jQuery code will go like:
$('.navbar-toggle').click(function(){
if($('#navbar').hasClass('in')){
$(".slider").addClass("sliderMove");
}else{
$(".slider").removeClass("sliderMove");
}
});
As you would like to remove the class when you collapse the menu again using same button.

you were doing everything fine, but you need to use toggleClass() and select other CSS selector that is not #navbar
it also possible to add a delay? Because the class is already activated before the navbar is fully collapsed.
Yes it is possible, by adding setTimeout()
$(".collapsed").click(function() {
// toggle the class after half second
setTimeout(function() {
$(".slider").toggleClass("sliderMove");
}, 500);
});
/* just to show in small devices */
#media (max-width: 992px) {
.sliderMove {
background: red;
height: 100vh;
width: 100%
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- 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>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</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 class="active">Link <span class="sr-only">(current)</span>
</li>
<li>Link
</li>
<li class="dropdown">
Dropdown <span class="caret"></span>
<ul class="dropdown-menu">
<li>Action
</li>
<li>Another action
</li>
<li>Something else here
</li>
<li role="separator" class="divider"></li>
<li>Separated link
</li>
<li role="separator" class="divider"></li>
<li>One more separated link
</li>
</ul>
</li>
</ul>
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" placeholder="Search">
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
<ul class="nav navbar-nav navbar-right">
<li>Link
</li>
<li class="dropdown">
Dropdown <span class="caret"></span>
<ul class="dropdown-menu">
<li>Action
</li>
<li>Another action
</li>
<li>Something else here
</li>
<li role="separator" class="divider"></li>
<li>Separated link
</li>
</ul>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container-fluid -->
</nav>
<div class="slider"></div>

Try something like this:
(as you required when the user clicks the navbar-toggle button, adds a certain class to a certain div with jQuery)
$('body').ready(function() {
$('.navbar-toggle').on('click', function() {
$(".slider").toggleClass("sliderMove");
});
});

Try this
<nav class="navbar navbar-default navbar-static-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="collapse navbar-collapse" id="navbar">
<div class="slider">
<div class="container">
<div class="row">
other elements
</div> <!-- close row -->
</div> <!-- close container -->
</div>
</div><!-- /.navbar-collapse -->
</div><!-- /.container -->
</nav>
Javascript
$('.navbar-collapse').on('click', function() {
$(".slider").toggleClass("sliderMove");
});
CSS
.sliderMove{
height:100%;
width:100%
}
DEMO HERE

how to add space between the li in a collapse navbare

I trying to add space between the li in my collapse navbar
but the problem is when I minimise just a little my navigator the navbar doesn't collapse correctly image
this the code that I use:
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<div class="navbar navbar-default navbar-static-top" style="padding-top:5px !important; padding-bottom:5px !important; margin-left:auto; margin-right:auto ;max-width:1135px">
<div class="container">
<span style="font-weight:bold;">HELLO</span>
<button class="navbar-toggle" data-toggle="collapse" data-target=".navHeaderCollapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<div class="collapse navbar-collapse navHeaderCollapse">
<ul class="nav navbar-nav navbar-left">
<li>choice1</span></li>
<li>choice2</span></li>
<li>choice3</span></li>
<li>choice4</span></li>
<li>
<a href="#" data-toggle="dropdown" onclick="document.getElementById('form-connect').style.display=(document.getElementById('form-connect').style.display=='none')?'block':'none';">
<i class="fa fa-user hidden-xs" ></i>
<span style="font-weight:bold;">Connexion</span>
<i class="fa fa-angle-down hidden-xs"></i>
</a>
</li>
</ul>
</div>
</div>
</div>

You need to add the following CSS:
.navbar-default .navbar-nav>li>a {
padding: 15px 0;
}
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="navbar navbar-default navbar-static-top" style="padding-top:5px !important; padding-bottom:5px !important; margin-left:auto; margin-right:auto ;max-width:1135px">
<div class="container">
<span style="font-weight:bold;">HELLO</span>
<button class="navbar-toggle" data-toggle="collapse" data-target=".navHeaderCollapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<div class="collapse navbar-collapse navHeaderCollapse">
<ul class="nav navbar-nav navbar-left">
<li>choice1</span></li>
<li>choice2</span></li>
<li>choice3</span></li>
<li>choice4</span></li>
<li>
<a href="#" data-toggle="dropdown" onclick="document.getElementById('form-connect').style.display=(document.getElementById('form-connect').style.display=='none')?'block':'none';">
<i class="fa fa-user hidden-xs" ></i>
<span style="font-weight:bold;">Connexion</span>
<i class="fa fa-angle-down hidden-xs"></i>
</a>
</li>
</ul>
</div>
</div>
</div>