How to Dynamically Add Classes Based on JSON Values in JavaScript

Learn how to efficiently add dynamic classes to users based on their industry by optimizing your JavaScript code with mappings and template literals.
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Dynamically Adding Classes to JSON Values in JavaScript

Introduction

In modern web development, working with dynamic data is a common task. Many applications pull data from external sources in JSON format. One scenario is representing users with different occupations visually. For example, you might want to highlight users based on their industry (e.g., Health, Education, Construction, Science) by assigning color badges to quickly differentiate them at a glance.

In this guide, we'll go through a solution to dynamically add classes from JSON data without cluttering your code with multiple conditional statements.

The Problem

The original code struggled with adding different classes to elements based on the industry type pulled from a JSON file. While the initial implementation worked perfectly with hardcoded values, it failed to apply the correct classes when values were fetched dynamically.

Here's a brief overview of what the initial code looked like:

It fetched user data from an external JSON source.

It created HTML elements dynamically using template literals.

It attempted to add classes based on the industry type using multiple if statements, which could lead to complex and less maintainable code.

The Solution

To streamline the process, we can use an object to map industry names to their corresponding class names. This way, we can easily assign classes whenever we create a user card, eliminating the need for multiple conditional checks.

Step 1: Create a Mapping Object

First, we need to define a mapping between industry names and their corresponding classes:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update the JSON Fetching Code

Here’s how we can integrate this mapping into our JSON fetching and card creation logic:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Adding CSS for the Badges

Don’t forget to style your classes! Here’s an example of how you can define your CSS for each badge:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By using a mapping object, you can efficiently add dynamic classes based on values from JSON data, simplifying your JavaScript code and improving readability. This method not only makes your code cleaner but also easier to maintain in the long run.

Now, as you develop your web applications, you can apply this strategy to handle dynamic data more effectively. Happy coding!