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Learn how to dynamically filter JSON objects in JavaScript based on changing conditions using a simple function and select events.
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How to Dynamically Filter JSON Objects in JavaScript using Select Events

Filtering data dynamically based on user-selected values can be a common requirement when working with web applications. If you’ve been struggling to implement a dynamic filtering system for JSON objects, you’re in the right place! In this guide, we will walk through an effective way to filter JSON objects in JavaScript, allowing for changeable conditions.

Understanding the Problem

Suppose you have a dataset and you want to filter it based on various fields, such as jobStatusId, jobTypeId, or jobPriorityId. The challenge is to make this filtering dynamic so that users can select different criteria from a dropdown (HTML <select> element). Here’s how we can achieve this.

Sample Data Structure

Let’s begin with a simple JSON object structure that we will use throughout this post:

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Implementing the Dynamic Filter

Step 1: Define a Type for Job Types

To start, you'll need to create a type for your job properties. This helps TypeScript understand what values can be used:

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

Step 2: Create a Filter Function

Now, let’s define the filterData function. This function will dynamically filter the filteredData based on the condition you pass to it:

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

Step 3: Update the HTML Template

In your HTML file, set up a <select> element that calls the filterData method whenever its value changes. You need to ensure that your condition corresponds to the defined JobType.

Here’s how the <select> implementation looks:

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

Example Usage

Let’s take a look at how you would call the filterData function:

Filter by Job Status:

Call filterData(2, 'jobStatusId') – This would return all objects where jobStatusId is 2.

Further Filtering:

Next, you can execute another filter like filterData(4, 'jobPriorityId') to refine the results based on the job priority.

Sample Output

If you first filter by jobStatusId and then by jobPriorityId, the final output will yield the precise data you need for your application.

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

Conclusion

By following these steps, you can effectively create a dynamic filtering system for JSON objects in your JavaScript application. The process not only enhances interactivity in your web applications but also streamlines data management, allowing users to make customized selections effortlessly.

Happy coding, and feel free to explore further enhancements or optimizations based on your specific needs!