Create a html page with javascript

Question

JavaScript makes HTML pages more dynamic and interactive.

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The HTML

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A Taste of JavaScript

Here are some examples of what JavaScript can do:

Example

JavaScript can change content:

document.getElementById("demo").innerHTML = "Hello JavaScript!";

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Example

JavaScript can change styles:

document.getElementById("demo").style.fontSize = "25px";
document.getElementById("demo").style.color = "red";
document.getElementById("demo").style.backgroundColor = "yellow";

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Example

JavaScript can change attributes:

document.getElementById("image").src = "picture.gif";

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The HTML
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HTML Exercises

Test Yourself With Exercises

Exercise:

Use JavaScript to change the HTML content of the

element to "Hello World!".

Hi.

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HTML Script Tags

Tag Description

Prerequisites

Microsoft Visual Studio Code
Familiarity with one or more programming languages and a markup language such as HTML
A computer that's running one of the following operating systems:
- Windows: Windows 7, 8, 10
- Mac: macOS 10.9 or later
- Linux: Ubuntu, Debian, Red Hat, Fedora, or SUSE

Introduction

JavaScript, also abbreviated to JS, is a programming language used in web development. As one of the core technologies of the web alongside HTML and CSS, JavaScript is used to make webpages interactive and to build web apps. Modern web browsers, which adhere to common display standards, support JavaScript through built-in engines without the need for additional plugins.

When working with files for the web, JavaScript needs to be loaded and run alongside HTML markup. This can be done either inline within an HTML document or in a separate file that the browser will download alongside the HTML document.

This tutorial will go over how to incorporate JavaScript into your web files, both inline into an HTML document and as a separate file.

Adding JavaScript into an HTML Document

You can add JavaScript code in an HTML document by employing the dedicated HTML tag

Scripts that are small or that run only on one page can work fine within an HTML file, but for larger scripts or scripts that will be used on many pages, it is not a very effective solution because including it can become unwieldy or difficult to read and understand. In the next section, we’ll go over how to handle a separate JavaScript file in your HTML document.

`Working with a Separate JavaScript File`

In order to accommodate larger scripts or scripts that will be used across several pages, JavaScript code generally lives in one or more js files that are referenced within HTML documents, similarly to how external assets like CSS are referenced.

The benefits of using a separate JavaScript file include:

Separating the HTML markup and JavaScript code to make both more straightforward
Separate files makes maintenance easier
When JavaScript files are cached, pages load more quickly

To demonstrate how to connect a JavaScript document to an HTML document, let’s create a small web project. It will consist of script.js in the js/ directory, style.css in the css/ directory, and a main index.html in the root of the project.

project/
├── css/
|   └── style.css
├── js/
|   └── script.js
└── index.html

We can start with our previous HTML template from the section above:

index.html

DOCTYPE html>
<html lang="en-US">
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Today's Datetitle>
head>
 
<body>
 
body>
 
html>

Now, let’s move our JavaScript code that will show the date as an

 header to the script.js file:
script.js
let d = new Date();
document.body.innerHTML = "Today's date is " + d + "
"
We can add a reference to this script to the  section, with the following line of code:
<script src="js/script.js"></script>
The  tag either inside the head of the HTML or at the end of the body.

programming javascript HTML JavaScript Script> tag HTML

Bài Viết Liên Quan

Create a html page with javascript

A Taste of JavaScript

Example

Example

Example

HTML Exercises

Test Yourself With Exercises

Exercise:

HTML Script Tags

Prerequisites

Introduction

Adding JavaScript into an HTML Document

Working with a Separate JavaScript File

Today's date is " + d + "

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