Introduction to CSS Loader

CSS Loader being a front-end component is defined as an npm Module that collects all the CSS files referenced in the working application to help webpack and consolidate into a string. This compiles an application of a particular resource as a JavaScript module (CSS to JS file). In simple term, it is considered as an animation that triggers the website saying that the page is loading and to suspend for a second and responsible for fetching styles from the respective CSS files. With no CSS loader added up in the browser, it is assumed that the respective page is unresponsive. Loader helps in loading the styles we require to the different sections of our application with added benefits of modular and easy use.

Syntax

npm install –save-dev CSS-loader

Where npm is the manager package node where we can do the CSS-loader. They are simply a module creator which can be installed with a single line comment. Loader being a Web Pack feature embed well with @import and URL() in which all the external files are loaded using the ‘require’ component.

Working of CSS Loader

We can make it with a div that makes the entire screen with a white animated page loader with none set as a display property.

Here in our article, I have installed node.js to get npm installed.

To build a CSS module all the style sheets are worked with the React Components. To do so we need to load the loaders in the Web Pack. With CSS modules, it is easy to name the classes with no global issues. To load this CSS into the local component requires import. To work with js module these are the following step

1. Getting started

It begins to install a css-loader. here comes the syntax path

npm install –save-dev css-loader

The following snippets show the installation of the files

The following snipes show CSS extraction from the Loader.

C:\Users\node_modules>npm install css-loader –save-dev

Testing the Package (CSS)

C:\Users\Papitha\node_modules>npx webpack –mode=development

And for the production

<code

C:\Users\Papitha\node_modules>npx webpack –mode=production

2. Defining a CSS file

.dd
{ color :violet;
}

3. Webpack config -Plugin – To interpret all the CSS files

Import css from 'demo.css'

4. javascript webpack

module.exports = {
module: {
rules: [
{
test: /\.css$/i,
use: ['style-loader', 'css-loader'],
},
],
},
};

5. String

module.exports = {
module: {
rules: [
{
test: /\.css$/i,
loader: 'css-loader',
options: {
modules: 'global', // delaration of global variables
},
},
],
},
};

Examples of CSS Loader

Here are the following examples mention below

Example #1

The html file shows how the CSS files enable a style by calling the respective class to load the process with animation.

load.html Code:

<!DOCTYPE html>
<html>
<head>
<title>Demo on CSS Loader Process</title>
<style>
h1{
color:green;
}
div{
display: block;
position: absolute;
width: 12px;
height: 12px;
right: calc(60% - 1em);
border-radius: 1.1em;
transform-origin: 1em 1em;
animation: rotate;
animation-iteration-count:infinite;
animation-duration: 2s;
}
@keyframes rotate {
0% { transform: rotate(0deg); }
100% { transform: rotate(180deg); }
}
.aa {
animation-delay: 0.2s;
background-color: yellow;
}
.bb {
animation-delay: 0.3s;
background-color: pink;
}
.cc {
animation-delay: 0.4s;
background-color: red;
}
.dd {
animation-delay: 0.5s;
background-color: blue;
}
.ee {
animation-delay: 0.6s;
background-color: brown;
}
</style>
</head>
<body>
<center>
<h1>Demo on CSS Loader Process</h1>
<div class='aa'></div>
<div class='bb'></div>
<div class='cc'></div>
<div class='dd'></div>
<div class='ee'></div>
</center>
</body>
</html>

Output:

We have seen a simple preloading sequence animations using CSS loader which makes an easy transition.

Example #2

With the same example – CSS is loaded with spinning. Even CSS Spinner could be used in the class which makes a simple circle spinning with just an easy <div>.

Code:

<!DOCTYPE html>
<html>
<head>
<style>
h1{
text-align:center;
}
.load1 {
border: 19px solid #008080;
position:absolute;
border-radius: 49%;
border-top: 21px solid rose;
border-bottom: 21px solid rose;
width: 140px;
height: 140px;
animation: spin 3s linear infinite;
}
.load2 {
border: 20px solid #008080;
position:absolute;
left:45%;
border-radius: 49%;
border-top: 22px solid rose;
border-bottom: 22px solid green;
border-right: 22px solid red;
width: 140px;
height: 140px;
animation: spin 3s linear infinite;
}
.load3 {
border: 20px solid #FF6347;
position:absolute;
left:75%;
border-radius: 49%;
border-top: 21px solid rose;
border-bottom: 21px solid green;
border-right: 21px solid red;
border-left:21px solid blue;
width: 150px;
height: 150px;
animation: spin 3s linear infinite;
}
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
</style>
</head>
<body>
<h1>CSS Loader</h1>
<div class="load"></div>
<div class="load1"></div>
<div class="load2"></div>
</body>
</html>

What we have done here is we have created an easy position type has absolute. And the circle round is given by specifying width and height and almost adding radius value. Next assigning a different color for the border. And now we implement Animation keyframes to have a rotation.

Output:

Example #3

Code:

<!DOCTYPE html>
<html>
<head>
<title>CSS Loader - Semantic UI</title>
<link href=
"https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.4.1/semantic.min.css"
rel="stylesheet" />
</head>
<body>
<div class="ui container">
<h2>CSS Loader - Semantic UI</h2>
<div style="height: 130px; width: 450px;"
class="ui segment">
<div class="ui active dimmer">
<div class="ui indeterminate text loader">
Processing Data- Please Wait</div>
</div>
<p></p>
</div>
</div>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.4.1/semantic.min.js">
</script>
</body>
</html>

Output:

Example #4

With four different colors used for loading

Code:

<!DOCTYPE html>
<html>
<head>
<title>example on loader</title>
<style>
h1{
color:purple;
}
.loadd {
display: block;
position: absolute;
width: 95px;
height: 15px;
right: calc(55% - 2em);
transform-origin: 3px 13px;
animation: rotate;
animation-iteration-count: infinite;
animation-duration: 3.1s;
}
@keyframes rotate {
from {
transform: rotateY(45deg);
}
to {
transform: rotateY(360deg);
}
}
.a1 {
animation-delay: 0.2s;
background-color: #C71585;
}
.a2 {
animation-delay: 0.3s;
background-color: #20B2AA;
}
.a3 {
animation-delay: 0.4s;
background-color: #DC143;
}
.a4 {
animation-delay: 0.4s;
background-color: #0000FF ;
}
.a5 {
animation-delay: 0.5s;
background-color: #808000;
}
</style>
</head>
<body>
<center>
<h2>EDUCBA</h2>
<h4>CSS Loader vertical</h4>
<div class='loader'>
<div class='loadd a1'></div>
<div class='loadd a2'></div>
<div class='loadd a3'></div>
<div class='loadd a4'></div>
<div class='loadd a5'></div>
</div>
</center>
</body>
</html>

Output:

Conclusion

As we know that CSS is helpful in styling and we can add animations or any other motion pictures on a particular web page. Therefore, emphasizing Loader on a web page enables the users to wait for a few seconds until the complete page is loaded. This Loader enhances better user experience with this simple animation while the page is loading and benefits needed structures to the corresponding projects.

Quiz Result
Total Questions	Correct Answers	Wrong Answers	Percentage

Introduction to CSS Loader

Working of CSS Loader

Examples of CSS Loader

Example #1

Example #2

Example #3

Example #4

Conclusion

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