A load event in JavaScript is an event that is started when a web page or an element contained inside a web page has finished loading. It signifies that every resource (including images, stylesheets, scripts, and other elements) on the page has finished loading and is prepared for JavaScript interaction or manipulation.
The window object, which represents the full web page, or particular HTML elements like images, iframes, and script tags are just a few examples of elements to which the load event might be attached.Â
When the load event fires, it gives JavaScript code the ability to carry out specific operations or functions, such as changing the page's content, binding event handlers, or retrieving extra data.
Here's an example of attaching a load event handler to the window object in JavaScript: When the complete web page has finished loading in this example, the anonymous function will be called. Any additional actions you wish to carry out when the load event takes place can be used in place of the console.log statement.
<html>
<head>
<title>What is load event in JavaScript</title>
</head>
<body>
<script>
window.addEventListener('load', function() {
// Code to be executed after all resources have loaded
console.log('Page loaded!');
});
</script>
</body>
</html>The DOMContentLoaded event, which is triggered once the HTML content has fully loaded and been parsed without the need for additional resources like graphics or stylesheets, differs from the load event and should be kept in mind.
How to load function in JavaScript?
A function can be loaded in JavaScript by simply creating it and calling it when necessary.Â
An illustration of how to load a function in JavaScript is given here:
Define the function:
function myFunction() {
console.log("Hello, World!");
}Call the function:
myFunction();Full Code,
By calling myFunction(), the code inside the function will be executed, and in this case, it will display "Hello, World!" in the console.
<!DOCTYPE html>
<html>
<head>
<title>How to load function in JavaScript?</title>
</head>
<body>
<script>
function myFunction() {
console.log("Hello, World!");
}
myFunction();
</script>
</body>
</html>How to load function from External file in JavaScript?
Functions from external JavaScript files can also be loaded. The HTML file's <script> tag can be utilized for this. Here's an illustration:
Make the function in an external JavaScript file (such as script.js):
script.js
function myFunction() {
console.log("Hello, World!");
}
myFunction();In your HTML file, include the external JavaScript file using the <script> tag:
<!DOCTYPE html>
<html>
<head>
<title>How to load function from External files in JavaScript?</title>
<script src="script.js"></script>
</head>
<body>
<!-- Other HTML content -->
</body>
</html>Now, when a web browser loads the HTML file, the script.js file will also be loaded, making the myFunction() code accessible.Â
The HTML file's function or any other loaded JavaScript file can then be called.
Keep in mind to check that the HTML file's path to the JavaScript file is accurate and usable.
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