Inline JavaScript can be achieved by using Script tag inside the body of the HTML, and instead of specifying the source(src=”…”) of the JavaScript file in the Script tag, we have to write all the JavaScript code inside the Script tag.
Syntax:
<script>
// JavaScript Code
</script>
Example:
<!DOCTYPE html>
<html>
<head>
<title>Inline JavaScript</title>
<meta charset="utf-8">
<meta name="viewport"
content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href=
</head>
<body>
<div class="container">
<h1 style="text-align:center;color:green;">
GeeksforGeeks
</h1>
<form>
<div class="form-group">
<label for="">Enter Your Name:</label>
<input id="name"
class="form-control"
type="text"
placeholder="Input Your Name Here">
</div>
<div class="form-group">
<button id="btn-alert"
class="btn btn-success btn-lg float-right"
type="submit">
Submit
</button>
</div>
</form>
</div>
<script>
var user_name = document.getElementById("name");
document.getElementById("btn-alert").addEventListener("click", function(){
var value=user_name.value.trim();
if(!value)
alert("Name Cannot be empty!");
else
alert("Hello, " + value + "!\nGreetings From GeeksforGeeks.");
});
</script>
</body>
</html>
|
Output:
As soon as we enter a name and press the submit button, the JavaScript code inside the script tag will be triggered and we will get a pop-up message with our name and greeting text.
For deeper knowledge, you can visit What is the inline function in JavaScript ?
Note: Using Inline JavaScript is a bad practice and it is not recommended. It can be used for demonstration purposes so that the demonstrator doesn’t have to deal with 2 separate files at a time. It is recommended to write JavaScript code in a separate .js file and then link the same using src attribute in the script tag.