How to Call an async Function Inside an OnClick Event in JavaScript

Learn how to handle button clicks in JavaScript by showing a popup, and executing an `async` function based on user confirmation.
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How to Call an async Function Inside an OnClick Event in JavaScript

As a budding JavaScript developer, you might encounter scenarios where you want an action, such as a search operation, to take place only after user confirmation. In this guide, we'll explore how to effectively manage asynchronous functions in JavaScript when a user clicks a button and interacts with a popup confirmation dialogue.

The Problem Statement

Imagine you have a flight search form. When users fill out the form and click "Search," you want them to first acknowledge the Terms and Conditions before showing them the search results. This requires a responsive interaction that confirms their agreement.

You might consider using async and await to manage this interaction, but this can become tricky due to JavaScript's asynchronous nature and its single-threaded execution model.

Solution Overview

Instead of relying on async and await, you'll use an event listener bound to the "I understand" button in your popup modal. Here's how to structure your code to achieve this.

Step 1: Show the Popup

First, when the user clicks the "Search" button, you need to show the popup with your terms and conditions. This is done by invoking a function that displays the modal:

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

Step 2: Handle the User Confirmation

Next, you need to modify the activateLoadingOverlay2() function to manage the confirmation interaction. When the user clicks the "I understand" button, you will execute the search:

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

Step 3: Execute the Search Operation

Finally, ensure you have a function that handles fetching the search results:

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

Key Takeaways

Event Binding: Listen for the user's click event on the button inside the popup (i.e., "I understand") to proceed with next operations.

Asynchronous Behavior: In this case, directly managing the callback function from the event listener is more effective than trying to use async and await.

User Experience: By adding a confirmation step, you enhance the user experience and ensure that users are informed of important terms before proceeding.

By following these steps, you will create a smooth, user-friendly interaction in your JavaScript application. Embracing event handling makes your application feel responsive and respects user decisions.

For anyone new to JavaScript, this approach is not just about handling button clicks but also about understanding how to work with user inputs and asynchronous code effectively. Happy coding!