JavaScript

User Driven Events

Make sure you have gone through General programming, this will be a more advanced.

What's JavaScript?

Also known as EcmaScript. It's major aim is to allow users interact with HTML elements. It majorly allows page interactivity.

Example If you click on button, you would require to view confirmation dialog and accept yes or no. Also for form inputs, you need to validate user inputs like strong passwords can be validated in JavaScript.

<script> tags are used to enclose javascript codes

JavaScript in HTML

Just like Css in HTML, there are three ways of adding javascript in HTML:

  1. Embedded Scripts

  2. External file scripts

index.html
//Embedded Scripts
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Javscript</title>
    <script>
    function BtnClick() {
        alert('been clicked');
    }
    </script>
</head>
<body>
    <button onclick="BtnClick()">Javascript is cool</button>
</body>
</html>
external.html
//External file scripts
// index.html file
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Javscript</title>
    <script src="script.js"></script>
</head>
<body>
    <button onclick="ExternalClick()">External file</button>
</body>
</html>


// script.js file
function ExternalClick() {
    alert('am an external file clicked');
}

Note

The button in both codes above has an event onClick that recognises the button has been clicked by a user and issues an alert dialog box.

What You Will Learn

Let's give users freedom

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