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Stop auto-close dropdown menu after click on a link

i have dropdown menu from bootstrap 4.In adaptive small screen, I have hamburger, there has title dropdown its opens another one dropdown.So, when I open title dropdown to see what inside, dropdown automatically close full dropdown. Here`s code
<nav class="navbar navbar-expand-lg navbar-header">
<div class="container">
<div class="navbar-translate">
<a class="navbar-brand" href="./" rel="tooltip" title="Казахстанский инженерно-технологический университет" data-placement="bottom">
<img src="assets/img/logo_new.png" width="180">
</a>
<button class="navbar-toggler navbar-toggler" type="button" data-toggle="collapse" data-target="#navigation" aria-controls="navigation-index" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-bar bar1"></span>
<span class="navbar-toggler-bar bar2"></span>
<span class="navbar-toggler-bar bar3"></span>
</button>
</div>
<div class="collapse navbar-collapse" style="background-color: white;" id="navigation">
<ul class="navbar-nav mr-auto" id="testing">
<div class="nav-item dropdown">
<a class="nav-link dropdown-toggle myclass" data-toggle="dropdown" href="#" id="dropdownMenuButton" role="button" aria-haspopup="true" aria-expanded="false"><?=$m_admission[$_SESSION['lang']]?></a>
<ul class="dropdown-menu">
<a class="dropdown-item" href="?page=undergraduate"> <?=$b_undergraduate[$_SESSION['lang']]?> </a>
<a class="dropdown-item" href="?page=graduate"> <?=$b_graduate[$_SESSION['lang']]?> </a>
<a class="dropdown-item" href="https://kazetu.edu.kz/sites/dl/" target="_blank"> <?=$b_distance_learning[$_SESSION['lang']]?> </a>
<a class="dropdown-item" href="https://college.kazetu.edu.kz/"> <?=$b_college[$_SESSION['lang']]?> </a>
<a class="dropdown-item" href="https://zerde.kazetu.kz/?lang=ru" target="_blank"> <?=$zerde_kazetu_reg[$_SESSION['lang']]?> </a>
</ul>
</div>
</ul>
</div>
</div>
</nav>
</header>

I dont fount answer for my question, so, i just write it without bootstrap on clear html and css xD

How to make side by side drop down menus with bootstrap?

I am trying to a birthday input for my form which will contain three dropdown menus. The first one will have day, then month, and then year.
<div class="dropdown" style="position:inline-block">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
That is the code for one dropdown menu from the bootstrap website.

Have a look on below code
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="row">
<div class="col-lg-4 col-sm-4 col-xs-4">
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
</ul>
</div>
</div>
<div class="col-lg-4 col-sm-4 col-xs-4">
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
</ul>
</div>
</div>
<div class="col-lg-4 col-sm-4 col-xs-4">
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li>HTML</li>
<li>CSS</li>
<li>JavaScript</li>
</ul>
</div>
</div>
</div>
may it helps you.

You can use btn-group class to make your button menu side by side.
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class="btn-group">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<div class="btn-group">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<div class="btn-group">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>

Bootstrap navbar dropdown menu/collapsed navbar not opening

I am trying to add a navbar to this website, but for some reason it is not functioning how I thought it would. The main problem I am trying to solve is getting the dropdown menu to actually display the list. It visually looks like the menu is already expanded, but I don't know if that has anything to do with why it is not working. Currently, the collapsed version will open from the hamburger menu only because of the CSS I added. Without the CSS, that navbar will expand, but immediately collapse again. Things I have tried:
I have tried to switch the order that I include Bootstrap.js/css and jQuery, but that has no effect on it.
I have also tried to switch versions because I am not sure what is compatible with what, but that has not been successful.
The one thing that did work was using an old version of bootstrap, but I would like to use 4.0 or higher if that is possible.
I would appreciate it is someone could help me figure out why this is not working. Thanks!
.navbar-collapse.collapse.in {
display: block!important;
}
<!DOCTYPE html>
<html>
<head>
<title>Title</title>
<script
src="https://code.jquery.com/jquery-3.2.1.min.js">
</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<link rel="stylesheet" href="index.css">
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<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="#">Home <span class="sr-only">(current)</span></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="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Products
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About Us</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<div class="jumbotron">
<h1 class="display-3">Hello, world!</h1>
<p class="lead">This is a simple hero unit, a simple jumbotron-style component for calling extra attention to featured content or information.</p>
<hr class="my-4">
<p>It uses utility classes for typography and spacing to space content out within the larger container.</p>
<p class="lead">
<a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a>
</p>
</div>
</body>
</html>

That's because your bootstrap.js is version 3.3.7, and this is not how you implement sub-menu (on bootstrap 3). Although, If you're using bootstrap 4 already, you should consider updating your bootstrap.js to version 4.0.0 (And you should use the same versions of bootstrap.js and bootstrap.css to avoid unexepected bugs (like you just had).
.navbar-collapse.collapse.in {
display: block!important;
}
<!DOCTYPE html>
<html>
<head>
<title>Title</title>
<script
src="https://code.jquery.com/jquery-3.2.1.min.js">
</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<link rel="stylesheet" href="index.css">
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<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="#">Home <span class="sr-only">(current)</span></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="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Products
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About Us</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<div class="jumbotron">
<h1 class="display-3">Hello, world!</h1>
<p class="lead">This is a simple hero unit, a simple jumbotron-style component for calling extra attention to featured content or information.</p>
<hr class="my-4">
<p>It uses utility classes for typography and spacing to space content out within the larger container.</p>
<p class="lead">
<a class="btn btn-primary btn-lg" href="#" role="button">Learn more</a>
</p>
</div>
</body>
</html>

Bootstrap dropdown button disappears after clicking it

The button which should unhide the dropdown menu actually hides the dropdown button instead. Also, I have one more dropdown menu in this navigation and it works perfectly fine.
<div class="side-nav pull-right">
<div class="dropdown">
<button type="button" class="profile dropdown-toggle" data-toggle="dropdown" id = "dropdownMenuButton" aria-haspopup="true" aria-expanded="false">Bonjour Arthur K. <img src = "images/triangle.png" alt =""/> </button>
<div class="dropdown-menu" role="menu" aria-labelledby="dropdownMenuButton">
Utilisateurs
Snippets
Traductions
</div>
</div>
Mon compete
</div>

check this working example.. for more read this
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/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/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown button
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>

Cant get React component to format with Bootstrap style

Doing a basic example but the bootstrap style won't apply to the button coming from the React component. It does apply to the button within the HTML file. I have provided the bootstrap css from the CDN in the HTML file. Running on a simple python web server (python -m http.server 8001). What gives?
example1.jsx:
// example1.jsx:
var MyPulldown = React.createClass({
render: function () {
return <div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Second Dropdown
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
}
});
React.render(
<div>
<MyPulldown/>
</div>,
document.getElementById('container')
);
example1.html
<!-- example1.html -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
<!-- The core React library -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.12.2/react.js"></script>
<!-- In-browser JSX transformer, remove when pre-compiling JSX. -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.12.2/JSXTransformer.js"></script>
<script type="text/jsx" src="example1.jsx"></script>
</head>
<body>
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
First Dropdown
</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<div id='container' class="form-group">
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
</body>
</html>

In react class prop is reserved. You need to use className
className
To specify a CSS class, use the className attribute. This applies to
all regular DOM and SVG elements like <div>, <a>, and others.
var MyPulldown = React.createClass({
render: function () {
return <div className="dropdown">
<button className="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Second Dropdown
</button>
<div className="dropdown-menu" aria-labelledby="dropdownMenuButton">
<a className="dropdown-item" href="#">Action</a>
<a className="dropdown-item" href="#">Another action</a>
<a className="dropdown-item" href="#">Something else here</a>
</div>
</div>
}
});