How can I customize bootstrap dropdown? - html

Question

I'm a beginner in front-end development, I would like modify the behavior of bootstrap dropdown. In particular I would like to activate the second level with click and rather than hover. Also the first level items should be checkable, now if I click on it the dropdown closes.
I'm using this code: https://bootsnipp.com/snippets/kM4Q

Answer 1

You have tagged this question with bootstrap-4 tag, but you have added a link with bootstrap 3 files only, so in my answer I choose to use those files. This is a solution for Bootstrap 3 not 4.
To make that change, you could use jQuery, working with toggleClass function transforming also this CSS rule:
.dropdown-submenu:hover>.dropdown-menu {
display: block;
}
in this:
.dropdown-submenu > .dropdown-menu.active {
display: block;
}
To reset to initial situation when you close the dropdown menu, I added this function using Dropdown's event:
$('#mydropdown').on('hidden.bs.dropdown', function () {
$('ul', $(this)).removeClass("active");
})
This is the code:
$(document).ready(function(){
$('.dropdown-submenu > a').on("click", function(e){
$(this).next('ul').toggleClass("active");
e.preventDefault();
e.stopPropagation();
});
$('#mydropdown').on('hidden.bs.dropdown', function () {
$('ul', $(this)).removeClass("active");
})
});
.dropdown-submenu {
position: relative;
}
.dropdown-submenu>.dropdown-menu {
top: 0;
left: 100%;
margin-top: -6px;
margin-left: -1px;
-webkit-border-radius: 0 6px 6px 6px;
-moz-border-radius: 0 6px 6px;
border-radius: 0 6px 6px 6px;
}
.dropdown-submenu > .dropdown-menu.active {
display: block;
}
.dropdown-submenu>a:after {
display: block;
content: " ";
float: right;
width: 0;
height: 0;
border-color: transparent;
border-style: solid;
border-width: 5px 0 5px 5px;
border-left-color: #ccc;
margin-top: 5px;
margin-right: -10px;
}
.dropdown-submenu:hover>a:after {
border-left-color: #fff;
}
.dropdown-submenu.pull-left {
float: none;
}
.dropdown-submenu.pull-left>.dropdown-menu {
left: -100%;
margin-left: 10px;
-webkit-border-radius: 6px 0 6px 6px;
-moz-border-radius: 6px 0 6px 6px;
border-radius: 6px 0 6px 6px;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<div class="container">
<div class="row">
<div id="mydropdown">
<div class="dropdown">
<a id="dLabel" role="button" data-toggle="dropdown" class="btn btn-primary" data-target="dropdown-menu" href="#">
Dropdown <span class="caret"></span>
</a>
<ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu">
<li>Some action</li>
<li>Some other action</li>
<li class="divider"></li>
<li class="dropdown-submenu">
<a tabindex="-1" href="#">Hover me for more options</a>
<ul class="dropdown-menu">
<li><a tabindex="-1" href="#">Second level</a></li>
<li class="dropdown-submenu">
Even More..
<ul class="dropdown-menu">
<li>3rd level</li>
<li>3rd level</li>
</ul>
</li>
<li>Second level</li>
<li>Second level</li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>