Open drop-down menu onClick in sidebar - html

Question

I am working on a project and I have created one navbar. In this dropdown menu also present. In this dropdown, the hover effect is there.
Now I am trying to click event and open and close dropdown's submenu. But not working. I am using only HTML and CSS.
Now on hover dropdown is open. But I am trying to do:
open and close drop-down when I click.
My code is:
/* define a fixed width for the entire menu */
.navigation {
width: 300px;
}
/* reset our lists to remove bullet points and padding */
.mainmenu, .submenu {
list-style: none;
padding: 0;
margin: 0;
}
/* make ALL links (main and submenu) have padding and background color */
.mainmenu a {
display: block;
background-color: #CCC;
text-decoration: none;
padding: 10px;
color: #000;
}
/* add hover behaviour */
.mainmenu a:hover {
background-color: #C5C5C5;
}
/* when hovering over a .mainmenu item,
display the submenu inside it.
we're changing the submenu's max-height from 0 to 200px;
*/
.mainmenu li:hover .submenu {
display: block;
max-height: 200px;
}
/*
we now overwrite the background-color for .submenu links only.
CSS reads down the page, so code at the bottom will overwrite the code at the top.
*/
.submenu a {
background-color: #ddd;
}
/* hover behaviour for links inside .submenu */
.submenu a:hover {
background-color: #993;
}
/* this is the initial state of all submenus.
we set it to max-height: 0, and hide the overflowed content.
*/
.submenu {
overflow: hidden;
max-height: 0;
-webkit-transition: all 0.5s ease-out;
}
<nav class="navigation">
<ul class="mainmenu">
<li>Home</li>
<li>About</li>
<li>Products
<ul class="submenu">
<li>Tops</li>
<li>Bottoms</li>
<li>Footwear</li>
</ul>
</li>
<li>Contact us</li>
</ul>
</nav>

Answer 1

You can use a checkbox (<input type="checkbox">) with the adjacent sibling combinator (+) to toggle the sub menu. Convert the link (a) to a label. Set the label's for attribute to the input's id, and hide the input using display: none.
/* define a fixed width for the entire menu */
.navigation {
width: 300px;
}
/* reset our lists to remove bullet points and padding */
.mainmenu,
.submenu {
list-style: none;
padding: 0;
margin: 0;
}
/* make ALL links (main and submenu) have padding and background color */
.mainmenu a,
.mainmenu label {
display: block;
background-color: #CCC;
text-decoration: none;
padding: 10px;
color: #000;
}
.mainmenu input {
display: none;
}
/* add hover behaviour */
.mainmenu a:hover {
background-color: #C5C5C5;
}
/* when hovering over a .mainmenu item,
display the submenu inside it.
we're changing the submenu's max-height from 0 to 200px;
*/
.mainmenu :checked+.submenu {
display: block;
max-height: 200px;
}
/*
we now overwrite the background-color for .submenu links only.
CSS reads down the page, so code at the bottom will overwrite the code at the top.
*/
.submenu a {
background-color: #ddd;
}
/* hover behaviour for links inside .submenu */
.submenu a:hover {
background-color: #993;
}
/* this is the initial state of all submenus.
we set it to max-height: 0, and hide the overflowed content.
*/
.submenu {
overflow: hidden;
max-height: 0;
-webkit-transition: all 0.5s ease-out;
}
<nav class="navigation">
<ul class="mainmenu">
<li>Home</li>
<li>About</li>
<li><label for="products">Products</label><input type="checkbox" id="products">
<ul class="submenu">
<li>Tops</li>
<li>Bottoms</li>
<li>Footwear</li>
</ul>
</li>
<li>Contact us</li>
</ul>
</nav>

Answer 2

This is your solution
/* When the user clicks on the button,
toggle between hiding and showing the dropdown content */
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
// Close the dropdown if the user clicks outside of it
window.onclick = function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show')) {
openDropdown.classList.remove('show');
}
}
}
}
.navigation{
width: 300px;
}
.mainmenu,
.submenu {
list-style: none;
padding: 0;
margin: 0;
}
.mainmenu a {
display: block;
background-color: #CCC;
text-decoration: none;
padding: 10px;
color: #000;
}
.mainmenu a:hover {
background-color: #C5C5C5;
}
/**/
.dropbtn {
background-color: #ccc;
color: #000;
border: none;
cursor: pointer;
padding: 10px;
display: block;
}
.dropbtn:hover, .dropbtn:focus {
background-color: #ccc;
}
.dropbtn:hover{
background-color: #C5C5C5;
}
.dropdown {
position: relative;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #ddd;
min-width: 160px;
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
width: 300px;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown a:hover {background-color: #993;}
.show {display: block;}
<nav class="navigation">
<ul class="mainmenu">
<li><a>Home</a></li>
<li><a>About</a></li>
<div class="dropdown">
<li onclick="myFunction()" class="dropbtn">Products</li>
<div id="myDropdown" class="dropdown-content">
<a>Tops</a>
<a>Bottoms</a>
<a>Footwear</a>
</div>
</div>
<li>Contact us</li>
</ul>
</nav>
u can achieve with javascript and this is right solution