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Basics

JS Where To

Where to Write JavaScript

JavaScript is written inline, in script tags, or external files, with best practices.

Introduction to Placing JavaScript

JavaScript can be placed in different parts of an HTML document, each with its own use cases and best practices. Understanding where to put your JavaScript code is essential for maintaining clean, efficient, and fast-loading web pages. Let's explore the three main methods: inline, <script> tags, and external JavaScript files.

Inline JavaScript

Inline JavaScript is embedded directly within the HTML elements using the onclick, onmouseover, or other event attributes. This approach is straightforward but can lead to cluttered HTML and should be used sparingly.

JavaScript in <script> Tags

JavaScript can be placed inside <script> tags, which can be located in the <head> or <body> section of an HTML document. Placing scripts at the bottom of the <body> is recommended for better performance, as it allows the HTML to load first.

External JavaScript Files

For larger scripts or reusable code, it's best to place JavaScript in external files. This practice keeps HTML clean and improves maintainability. Use the <script src=""> tag to link to an external file.

Best Practices

  • Avoid inline JavaScript to keep HTML clean and separate concerns.
  • Place JavaScript at the end of the body to improve page load times.
  • Use external files for larger scripts to enhance maintainability.

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