Simplifying Form Validation with Vue.js

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Understanding the Problem

Imagine you have a ChangeInfo screen that consists of three components, each wrapped in its own ValidationObserver. The intent is to ensure that all three observers validate successfully before showing a notification modal. However, handling the validation and ensuring the modal displays correctly when one or more observers fail can be a bit tricky. This was the challenge encountered by a user who had code working fine when all inputs were valid, but saw issues when any validation failed.

The Initial Code Structure

First, let's look at the user's initial implementation. They had three ValidationObserver components for different parts of the user profile: profile information, work information, and personal information.

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The triggerSubmit function was structured as a series of nested promises, verifying each observer sequentially. While functional, this method can become hard to read and maintain:

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As evident, the needed result is cluttered by the deeply nested structure.

An Improved Solution Using Async/Await

To solve the problem while making the code cleaner and more efficient, we can refactor it using async/await. This allows us to perform asynchronous operations in a more synchronous style, making the code easier to read and maintain.

Here’s how you can restructure the triggerSubmit function:

Define Validation Functions

First, create helper functions for each validation check. These will return promises which can be awaited later.

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The Updated Trigger Function

Now, let’s rewrite triggerSubmit using async/await:

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Summary

Refactoring your code to use async/await not only simplifies the validation process, but it also enhances readability, making it clear which validations are being performed and in what order. This change allows developers to manage multiple observables more efficiently while also keeping the user informed about the success or failure of their actions.

By applying this structured approach, your validation logic will become more robust and easier to maintain over time.