So i'm learning css online and found this piece of code a bit confusing due to the fact that nothing changes in the output if i remove the " .dropbtn " class, why is it placed there alongside " li a " and why does deleting it has no impact on the output? Help would be greatly appreciated, Thanks! Here's the piece of code:
<!DOCTYPE html>
<html>
<head>
<style>
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1;}
.dropdown:hover .dropdown-content {
display: block;
}
</style>
</head>
<body>
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
The element with the class dropbtn matches the selector li a:
<li class="dropdown">
Dropdown
</li>
so the same rules for li a apply to this element.
Since all existing rules in this case are using both selectors li a, .dropbtn, removing the class doesn't change its styling and is therefore redundant.
BUT in a real world example you might have additional styling which should only apply to a dropdown-entry of your navigation (e.g.: with an after-element showing an arrow for example). In that case the dedicated class would make sense.
Furthermore using the .dropbtn selector alongside the li a selectors make sure, that even if the .dropbtn is not of type a, the same rules apply as for the other navigation elements.
<!DOCTYPE html>
<html>
<head>
<style>
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn{
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1;}
.dropdown:hover .dropdown-content {
display: block;
}
.dropbtn {
border-bottom: 3px solid red;
}
.dropbtn::after {
content: 'v';
color: red;
padding-left: 5px;
}
</style>
</head>
<body>
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
Related
so I am pretty new to development and come across a problem, I think I am missing somthing but I can't tell. So I am building a nav bar and then a drop down menu. I believe that the li is in the ul so that why it is not coming out of it. So how could I fix this. If you know any website that would be good let me know thank you
Code:
https://codepen.io/Giannilmgc/pen/JjrgZdr?editors=1111
Output:
https://codepen.io/Giannilmgc/full/JjrgZdr
To see what wrong keep your cursor over the to do tab and scroll down
#import url("https://fonts.googleapis.com/css2?family=Inter:wght#300&display=swap");
/* Here is the body style where we change the background */
body {
background: linear-gradient(135deg, #36454f 0%, #ffdd3c 100%);
margin: 5px;
}
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: auto;
background-color: white;
border-radius: 50px;
}
li {
float: left;
width: 16.667%;
transition-duration: 1s;
}
li a {
display: block;
color: black;
text-align: center;
padding: 14px 16px;
text-decoration: none;
transition-duration: 1s;
}
li:hover {
background-color: black;
}
li a:hover {
background-color: #36454f;
color: white;
}
#homepageLink {
background-color: #cccccc;
}
.dropdown {
position: relative;
display: inline-block;
}
ul li ul {
display: none;
position: absolute;
background-color: #cccccc;
width: 20%;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 10;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {
background-color: #36454f;
color: white;
}
.dropdown:hover .dropdown-content {
display: block;
}
<head>
<title> My Site </title>
<link rel="stylesheet" href="CSS/Homepage-Css.css" />
</head>
<body>
<body>
<div>
<ul>
<li>HomePage</li>
<li>Journal</li>
<li>Calander </li>
<li class="dropdown">To do
<ul class="dropdown-content">
<a herf="#">Latin</a>
<a herf="#">Scince</a>
<a herf="#">Ela</a>
</ul>
</li>
<li>Service</li>
<li>Contact</li>
</ul>
</div>
<div class="time">
<span id="display_ct"></span>
</body>
<!-- Adding Script to the bottom ... Very Imporantent -->
<script src="Javascript/Homepage-Java.js"></script>
Thank you
In the dropdown class you have set the position in relative. Change it to absolute and your drop down menu will come out.
.dropdown {
position: absolute;
display: inline-block;
}
you put display none on the dropdown and try to show it when its hover on li.
but when the mouse go out from li the display:none on dropdown is return.
try to make it with after pseudo element and change the code from .dropdown { position: relative; display: inline-block; }
to:li:after.dropdown { position: relative; display: inline-block; }
it will work but not an ideal, improve it with css
If you want to create a dropdown menu with pure CSS there is this example from w3schools
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1;}
.dropdown:hover .dropdown-content {
display: block;
}
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
Its is example on w3school.
I don't understand why if I add position:relative on ancestor class of dropDown-content.
Navbar does not display dropdown item and an element with position: absolute; is positioned relative to the nearest positioned ancestor, but without position:relative, is till not positioned body tag as ancestor?
Is there any way to solve this?
<!DOCTYPE html>
<html>
<head>
<style>
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
position:relative;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1;}
.dropdown:hover .dropdown-content {
display: block;
}
</style>
</head>
<body>
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
As per this post, the child element of a relative parent should have position: fixed
Add
.dropdown-content {
position: fixed;
}
That will work for you.
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
position:relative;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
position: fixed;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1;}
.dropdown:hover .dropdown-content {
display: block;
}
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
I am preparing a blogger template. And the navigation menu creating problems. Submenu appearing next to parent menu. But not dropping down.
Have a look at testblogorfy.blogspot.com.
View CSS via "pagesource"--> #menu or "header-navigation"
You can read this link for more clarification https://www.w3schools.com/css/css_dropdowns.asp.
For your support I have paste the same code from the above link.
Basically for sub menu, you have to create another ul nested within the li element.
HTML
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
CSS
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
z-index: 1;
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
I'm new to programming. I'm having trouble centering a <nav> bar a made. I followed this specific one.
How would I be able to center entire nav bar?
Click Here
set text-align:center to ul and remove float:none from li and add display:inline-block
check with demo
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
text-align:center;
}
li {
float: none;
display:inline-block;
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
I'm attempting to implement a CSS dropdown menu, based on this example from w3schools. It is working, but the left margin around the dropbtn class is not the same as the left margin for the simple navigation links(Home, News). As you move from the one list item to another the item implementing the dropdown menu has a black border on the left that I cannot explain.
This behavior started when I attempted to implement a divider between the items using li+li:before as shown here.
default.html
<!DOCTYPE HTML>
<html>
<head>
<link rel="stylesheet" type="text/css" href="styles/style.css" />
</head>
<body>
<ul>
<li>Home</li>
<li>News</li>
<li class="dropdown">
Dropdown
<div class="dropdown-content">
Link 1
Link 2
Link 3
</div>
</li>
</ul>
<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>
</body>
</html>
style.css
ul {
list-style-type: none;
margin: 0;
padding: 0;
overflow: hidden;
background-color: #333;
}
li {
float: left;
}
li+li:before {
color: white;
content: "|";
}
li a, .dropbtn {
display: inline-block;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
li a:hover, .dropdown:hover .dropbtn {
background-color: red;
}
li.dropdown {
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover .dropdown-content {
display: block;
}
You can just position that before element a little more precisely:
li {
float: left;
position: relative;
}
li+li:before {
color: white;
content: "|";
left: -1px;
top: 14px;
position: absolute;
}
https://jsfiddle.net/oao3yt8w/