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Javascript #1

JavaScript Step-by-Step Instructions

Step-by-Step Guide to JavaScript

Below are step-by-step instructions to create a simple webpage with JavaScript. Each step includes the HTML and JavaScript code and the expected result.

Step Explanation HTML & JavaScript Code Result
1 Create a button and a paragraph. We will use JavaScript to change the text when the button is clicked. <button onclick="displayMessage()">Click Me!</button>
<p id="message">This is a message.</p>
<script>
function displayMessage() {
  document.getElementById("message").innerHTML = "Hello, World!";
}
</script>

This is a message.
2 Add an input field and a button. JavaScript will display the entered text when the button is clicked. <input type="text" id="name" placeholder="Enter your name">
<button onclick="showName()">Submit</button>
<p id="output"></p>
<script>
function showName() {
  var name = document.getElementById("name").value;
  document.getElementById("output").innerHTML = "Hello, " + name + "!";
}
</script>

Full HTML & JavaScript Code Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JavaScript Demo</title>
</head>
<body>

    <!-- Button that changes text -->
    <button onclick="displayMessage()">Click Me!</button>
    <p id="message">This is a message.</p>

    <!-- Input field and button -->
    <input type="text" id="name" placeholder="Enter your name">
    <button onclick="showName()">Submit</button>
    <p id="output"></p>

    <!-- JavaScript code -->
    <script>
    function displayMessage() {
        document.getElementById("message").innerHTML = "Hello, World!";
    }

    function showName() {
        var name = document.getElementById("name").value;
        document.getElementById("output").innerHTML = "Hello, " + name + "!";
    }
    </script>

</body>
</html>
JavaScript Demo with Result Bar

Full HTML & JavaScript Code Example

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JavaScript Demo</title>
</head>
<body>

    <!-- Button that changes text -->
    <button onclick="displayMessage()">Click Me!</button>
    <p id="message">This is a message.</p>

    <!-- Input field and button -->
    <input type="text" id="name" placeholder="Enter your name">
    <button onclick="showName()">Submit</button>
    <p id="output"></p>

    <!-- JavaScript code -->
    <script>
    function displayMessage() {
        document.getElementById("message").innerHTML = "Hello, World!";
    }

    function showName() {
        var name = document.getElementById("name").value;
        document.getElementById("output").innerHTML = "Hello, " + name + "!";
    }
    </script>

</body>
</html>

Result:

Message: This is a message.

Output:

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