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How to reference a text file in Javascript

To use CSS in your HTML, create an external CSS file and follow the guidelines in the article to link the two files correctly. As much as this method allows you to easily add CSS to your HTML pages, it is not how to link to a javascript file a good way to add CSS to your HTML. This is because it is very time-consuming, makes code hard to read and maintain, particularly for large-scale styling, and can affect the loading times of web pages.

It is therefore advisable to use require for loading static JSON files such as configuration files that do not change often. Do not use require if the JSON file you load keeps changing, because it will cache the loaded file and use the cached version if you require the same file again. Additionally, CSS is crucial in creating responsive websites that adapt to different screen sizes and devices. It also allows for consistent and uniform styles across different pages on a website and helps in making websites accessible to users with disabilities.

Step 1: Create a file that ends with a .js extension

This is the recommended approach of adding CSS to your HTML documents to style your web pages. Furthermore, JavaScript files are included in footer of HTML code or above tag. But sometimes it will generate some error in some cases. So, It is better to place at the footer of the HTML page. Just like reading JSON files, the fs module provides built-in methods for writing to JSON files. You can use the writeFile and writeFileSync methods of the fs module.

  • I assume the application does this via one of above-mentioned methods.
  • Placing scripts at the bottom of the element improves the display speed, because script interpretation slows down the display.
  • The difference between the two is that writeFile is asynchronous while writeFileSync is synchronous.
  • Important here is to realize that these modules are being cached, so if you require() a certain module twice it will return the already created module.

Component-driven development is an excellent strategy to accelerate the development of frontends and user interfaces. We cannot stress enough the importance of multimedia such as images, infographics, and videos in development. However, the size of images affects the overall performance of an application and its usability.

External JavaScript file

The difference between the two is that readFile reads the file asynchronously while readFileSync reads the file synchronously. Therefore, readFileSync blocks the event loop and execution of the remaining code until all the data has been read. This article is a comprehensive guide on how to use the built-in fs module to read and write data in JSON format. We’ll also look at some third-party npm packages that simplify working with data in the JSON format.

You can read JSON data using the read method, which is asynchronous and returns a promise. Before writing a JSON file, make sure to serialize the JavaScript object to a JSON string using the JSON.stringify method. Path refers to the location of the JSON file you wish to read. Optionally, you can provide an object as the second argument. Make sure to deserialize the JSON string passed to the callback function before you start working with the resulting JavaScript object.

The difference between the two is that writeFile is asynchronous while writeFileSync is synchronous. Despite its name, the use of the JSON data format is not limited to JavaScript. Most programming languages implement data structures that you can easily convert to JSON string and vice versa. JavaScript, and therefore the Node.js runtime environment, is no exception. More often than not, this JSON data needs to be read from or written to a file for persistence.

how to link to a javascript file

You could load an additional script with an AJAX call and then use eval to run it. This is the most straightforward way, but it is limited to your domain because of the JavaScript sandbox security model. Using eval also opens the door to bugs, hacks and security issues. There are other ways for JavaScript to include external JavaScript contents in browsers that do not require preprocessing. The older CJS module style, still widely used in Node.js, is the module.exports/require system. I am at my wits end with linking a javaScript file to my main.html, they are both in the same folder.

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. The first argument is the error object if an error occurs, and the second is the serialized JSON data. You can use the require function to synchronously load JSON files in Node. Therefore, loading the file again using require will load the cached version. In a server environment, the file will be loaded again in the next server restart.

how to link to a javascript file