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Link to CSS and JavaScript in an HTML File DEV Community June 12, 2024

Paths specify where the file you’re interested in is located in the filesystem. Let’s look at an example of a directory structure, see the creating-hyperlinks directory. Before the introduction of the ES6 modules, JavaScript didn’t have import, require, or other functionalities. In 2015, the ES6 Modules module was introduced, which now makes it possible to import modules in Node.js supported by modern browsers. This would point to a file named ‘script.js’ that is in the same directory as the .html file. You can also link to other directories by using ’..’ in the file path.

In a real website, index.html would be our home page or landing page (a web page that serves as the entry point for a website or a particular section of a website.). To fully understand link targets, you need to understand URLs and file paths. This section gives you the information you need to achieve this.

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Create a JavaScript file with the extension.js outside of the application. After created, paste it inside the script tag of the HTML file. This external JavaScript file is included using the property. Improve page performance by including more external JavaScript files on the same website. It is a good idea to keep your HTML, CSS, and JavaScript files in separate directories. Inside this directory, create three additional directories.

The type attribute in script tag is not mandatory in HTML5. There are also two directories inside our root — pdfs and projects. These each have a single file inside them — a PDF (project-brief.pdf) and an index.html file, respectively. Note that you can have two index.html files in one project, as long as they’re in different filesystem locations. The second index.html would perhaps be the main landing page for project-related information.

Linking to CSS and JavaScript

You build your JavaScript code in separate files and include comments that are processed by the Sprockets engine as includes. For development you can include files sequentially, then for production to merge them… JQuery is simply a Javascript file, so if you download a copy of the file you can include it within your page using a script tag. You can also include Jquery from a content distribution network such as the one hosted by Google. For this exercise, we’d like you to link some pages together with a navigation menu to create a multipage website.

The ‘src’ attribute in a tag is the path to an external file or resource that you want to link to your HTML document. A
mix file simply extends the functionality of a normal style or
script file and allows you to import and combine. Browsers have had support for loading ECMAScript modules directly (no tools like Webpack required) since Safari 10.1, Chrome 61, Firefox 60, and Edge 16. There is no need to use Node.js’ .mjs extension; browsers completely ignore file extensions on modules/scripts.

File

JavaScript allows users to create modern web applications that they may use without reloading the page. The DOM API often uses JavaScript to update HTML and CSS to change a user interface. Scripting is a term used to describe languages that must be supported by another language to be run.

how to link to a javascript file

I assume the application does this via one of above-mentioned methods. As you saw, I had use a variable in one JavaScript file in another JavaScript file, but I didn’t need to include one in another. I was searching instead for a compiler which assemble all the depended files into a single output file. The same as Less/Sass preprocessors deal with the CSS @import at-rule. Since I didn’t find anything decent of this sort, I wrote a simple tool solving the issue. You could load an additional script with an AJAX call and then use eval to run it.

Relative file path “versus” Absolute file path

Web apps and web pages can be interactive with the help of JavaScript. Since most browsers widely support JavaScript, this shouldn’t be an issue. Your browser has specific built-in engines that allow this to run.

how to link to a javascript file

The most commonly used of these are “subject”, “cc”, and “body” (which is not a true header field, but allows you to specify a short content message for the new email). The root of this directory structure is called creating-hyperlinks. When working locally with a website, you’ll have one directory that contains the entire site. Inside the root, we have an index.html file and a contacts.html.

CSS

In this context, the term “script” refers to JavaScript, which runs on the local computer and is not an independent program. The second method, involving JavaScript in an external file, is the more usual one. We’re a place where coders share, stay up-to-date and grow their careers.

how to link to a javascript file

If you notice, both index.html file and main.js file are located at the same level inside the file system. What follows is a detailed explanation of relative file paths and absolute file paths and when to use what. The purpose of this tutorial how to connect js to html is to teach you how to link to CSS and JavaScript files within an HTML file. It is possible to write CSS and JavaScript directly inside an HTML document, but it is generally best to keep these three languages in their own separate files.

It will become hidden in your post, but will still be visible via the comment’s permalink. Fortunately, Web Workers have their own importScripts function which is a global function in the scope of the Web Worker, native to the browser itself as it is part of the specification. Connect and share knowledge within a single location that is structured and easy to search.

how to link to a javascript file