tags in an HTML document, it becomes inactive.Ĭertain JavaScripts do not work with all the browsers and sometimes a script works on and above (or vice a versa) a particular version of a web browser.

If javascript is disabled in the browser property, even though an external script is attached or a script is written within. popup, alert message, animations etc.) to an HTML document you can add JavaScipt to your HTML document. If you like to add presentational features to an HTML document you can attach css to an HTML document, to add dynamic user experience (e.g. To use JavaScript from an external file source, you need to write all your JavaScript source code in a simple text file with the extension '.js' and then include that file as shown above.įor example, you can keep the following content in filename.js file and then you can use sayHello function in your HTML file after including the filename.js file.An HTML document is made up of HTML elements, HTML element attributes, comments, special characters, and doctype. Here is an example to show how you can include an external JavaScript file in your HTML code using script tag and its src attribute. The script tag provides a mechanism to allow you to store JavaScript in an external file and then include it into your HTML files. You are not restricted to be maintaining identical code in multiple HTML files. This code will produce the following result − JavaScript in External FileĪs you begin to work more extensively with JavaScript, you will be likely to find that there are cases where you are reusing identical JavaScript code on multiple pages of a site.

Include javascript in html