HTML5 JavaScript tutorial with examples

JavaScript tutorial for experienced

JavaScript in HTML

JavaScript usage in HTML

In HTML using JavaScript it will makes more dynamic and interactive web pages.
We will see an example to write a hello world to display on HTML form using JavaScript

Example: <!DOCTYPE html> <html> <body> <h2>My JavaScript Hello World!</h2> <button type="button" onclick="document.getElementById('hello').innerHTML = 'Hello World!'"> Click here to display Hello World!.</button> <p id="hello"></p> </body> </html>

Output: the following will be the output check with your editor for more practice.

My JavaScript Hello World!

Hello World!

HTML5 using Script tag

Script tag usage

To use JavaScript in to HTML form we need to declare this

<script>open tag and </script> end tag with in this tags need to write scripting statements with standard methods of JavaScript ll these we learn on JavaScript Tutorial.. if any of external script file or any other source of other folder path we use src attribute to call the JavaScript file.
To identify HTML element in JavaScript uses document.getElementById() method.

Example: <!DOCTYPE html> <html> <body> <h2>My JavaScript Hello World!</h2> <p id="hello"></p> <script> document.getElementById('hello').innerHTML = “Hello World!"; </script> </body> </html>

No Script tag
No Script tag usage

"noscript" tag is used to display an alternate content to the client-side support information who are disabled script in their browser or with their browser that doesn’t support client-side script. This tag will run and show the information such messages shown on below example.

Example: <script> document.getElementById("hello").innerHTML = "Hello World!"; </script> <noscript>Hey, your browser does not support JavaScript! Contact Admin to correct it and try again thank you..! </noscript>

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