Introduction to loader.js
Loader.js is a powerful JavaScript library designed for efficiently loading JavaScript and CSS assets in web applications. It provides a lightweight and flexible solution to manage dependencies and optimize load times, enhancing the user experience and boosting web application performance.
Key API Functions in loader.js
1. loadScript
Use the loadScript function to dynamically load JavaScript files.
loader.loadScript('path/to/script.js', function() {
console.log('Script loaded successfully!');
});
2. loadStylesheet
The loadStylesheet function allows you to dynamically load CSS files.
loader.loadStylesheet('path/to/style.css', function() {
console.log('Stylesheet loaded successfully!');
});
3. loadMultipleScripts
Use loadMultipleScripts to load several JavaScript files asynchronously.
loader.loadMultipleScripts(['path/to/script1.js', 'path/to/script2.js'], function() {
console.log('All scripts loaded successfully!');
});
4. loadMultipleStylesheets
The loadMultipleStylesheets function loads multiple CSS files asynchronously.
loader.loadMultipleStylesheets(['path/to/style1.css', 'path/to/style2.css'], function() {
console.log('All stylesheets loaded successfully!');
});
5. loadJSON
Use loadJSON to load JSON files and handle the data accordingly.
loader.loadJSON('path/to/data.json', function(data) {
console.log('Loaded JSON data:', data);
});
Application Example
Here is a simple web application example that uses loader.js to load multiple assets dynamically and enhance the page performance.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Loader.js Example</title>
</head>
<body>
<h1>Welcome to Loader.js Example</h1>
<div id="content">Content will be displayed here after loading assets.</div>
<script src="path/to/loader.js"></script>
<script>
loader.loadMultipleScripts(['path/to/script1.js', 'path/to/script2.js'], function() {
console.log('All scripts loaded successfully!');
// Initialize your scripts after loading
initializeApplication();
});
loader.loadMultipleStylesheets(['path/to/style1.css', 'path/to/style2.css'], function() {
console.log('All stylesheets loaded successfully!');
// Further actions after stylesheets are loaded
});
function initializeApplication() {
document.getElementById('content').innerText = 'All assets loaded and application initialized!';
}
</script>
</body>
</html>
By leveraging loader.js, you can dynamically manage asset dependencies and improve the user experience by minimizing the load times and avoiding render-blocking issues.
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