JavaScript enhances HTML pages by making them more dynamic and interactive.
The HTML <script> tag serves to specify a client-side script (JavaScript).
Within the <script> element, script statements are included, or it can reference an external script file via the src attribute.
JavaScript finds common applications in tasks like image manipulation, form validation, and dynamically altering content.
For selecting HTML elements, JavaScript frequently employs the document.getElementById() method.
Below is an example of JavaScript code that writes “Hello JavaScript!” into an HTML element identified by the id=”demo”:
Example
| <script> document.getElementById(“demo”).innerHTML = “Hello JavaScript!”; </script> |
Below are some instances showcasing the capabilities of JavaScript:
Example
JavaScript has the ability to alter content.
| document.getElementById(“demo”).innerHTML = “Hello JavaScript!”; |
Example
JavaScript can modify styles.
| document.getElementById(“demo”).style.fontSize = “25px”; document.getElementById(“demo”).style.color = “red”; document.getElementById(“demo”).style.backgroundColor = “yellow”; |
Example
JavaScript has the capability to modify attributes.
| document.getElementById(“image”).src = “picture.gif”; |
The HTML <noscript> tag specifies alternative content to be shown to users who have disabled scripts in their browser or are using a browser that doesn’t support scripts.
Example
| <script> document.getElementById(“demo”).innerHTML = “Hello JavaScript!”; </script> <noscript>Sorry, your browser does not support JavaScript!</noscript> |
