How to Translate Your jQuery Code to Pure JavaScript for Input Validation

A step-by-step guide to converting your jQuery input validation script to pure JavaScript without losing functionality. Learn how!
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How to Translate Your jQuery Code to Pure JavaScript for Input Validation

If you’ve ever found yourself in a situation where a project needs to eliminate jQuery usage, you might be wondering how to convert your existing jQuery code into pure JavaScript. It can seem daunting at first, especially if you're familiar with jQuery's syntax and functionality. In this article, we will take a closer look at a jQuery code snippet that checks if inputs are filled and convert it into pure JavaScript.

The Problem

You have a piece of jQuery code that checks for input fullness in a registration form, but you need to rewrite it in JavaScript. Here’s the original jQuery code:

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

Key Points of the jQuery Code:

It waits for the document to be fully loaded.

It adds a click event listener to a button with the id btn.

It checks each input field with the class rfield under the registration__labels.

It logs an error or success message based on the input's value.

It manages CSS classes to reflect validation status.

The Solution in Pure JavaScript

To achieve the same functionality without jQuery, you can utilize the following JavaScript code:

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

Breakdown of the JavaScript Code:

Event Listener for DOMContentLoaded:

This will ensure that the JavaScript only runs once the HTML has been completely loaded.

Selecting Input Fields:

This line selects all input fields under the registration labels that we want to validate.

Button Click Handler:

Set an event listener that listens for a click action on the button with the id btn.

Validation Logic:

Using forEach, we iterate through each input field:

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

The toggle method adds the error class if the field is empty and removes it if it’s filled.

It also logs 2 if there is an error (input is empty) and 1 for valid input.

Conclusion

Translating your jQuery code into pure JavaScript may seem challenging, but with this breakdown, you can see how straightforward it can be. Always remember to break your tasks into smaller, manageable pieces, and leverage modern JavaScript syntax to simplify your code!

By following the above example, you can efficiently transform jQuery functionalities into clean JavaScript, allowing your application to run faster with fewer dependencies. Happy coding!