Скачать или смотреть How to Autofill Input After Selecting an Option with JavaScript DOM

Learn how to easily implement an `autofill` input feature based on selected options in JavaScript DOM, making your forms user-friendly and efficient.
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This video is based on the question https://stackoverflow.com/q/67231953/ asked by the user 'Angga P.J' ( https://stackoverflow.com/u/12274169/ ) and on the answer https://stackoverflow.com/a/67232259/ provided by the user 'ikiK' ( https://stackoverflow.com/u/7158959/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating an Autofill Feature in JavaScript Forms

When building web applications, forms are often a key element to gather user input. However, one common challenge developers face is how to make these forms more user-friendly. An effective solution is implementing an autofill feature that automatically populates a price input based on the user's selection from a dropdown menu. In this guide, we will break down how to create this feature step by step.

Problem Statement: Autofilling Price on Selection

Suppose you want a form where users can select a tour package from a dropdown menu, and based on their selection, a corresponding price should be displayed in an input field. Additionally, users should be able to apply a discount and see the final amount they need to pay. The challenge arises in how to correctly implement the event listeners to achieve this behavior. Let's dive into the solution.

Step-by-Step Solution

1. HTML Structure

First, we will create the basic HTML structure for our form. Here's how it looks:

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

2. Adding JavaScript Logic

Next, we need to implement the JavaScript functionality that will handle the selection change. Here’s how you can do this effectively:

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

Explanation of the JavaScript Function

The myFunction takes the event as an argument. This allows us to access the selected option.

We use a series of conditional statements (if-else) to determine which option was selected and set the corresponding price into the input field with the ID harga.

3. Connecting the Input Discounts and Final Price

To compute the total price after applying the discount, you can extend your JavaScript code as needed. Here's an example of how to do that:

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

Final Thoughts

Implementing an autofill feature in your forms enhances user experience significantly. With just a few lines of JavaScript, you can create a dynamic form that not only updates with user interaction but also calculates totals based on user inputs. This technique is just one of many ways to increase the interactivity of your web applications.

By following these steps, you can incorporate an autofill feature in your own forms efficiently. Remember, user-centric design is key to creating effective web applications.

Keep exploring different ways to enhance your forms and make your application a delight to use!