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Learn how to dynamically update an email textbox in MVC 5 whenever the user ID changes, ensuring a seamless user experience.
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Auto Fill Email Textbox Based on User ID Change in MVC 5

When developing web applications, one common user interaction is entering related information across multiple fields. In this post, we will explore how to automatically fill an email textbox based on changes made to a User ID textbox in an ASP.NET MVC 5 application. This functionality streamlines the user experience by eliminating the need for manual entry of related information.

The Problem

Imagine a scenario where you have two textboxes on your form:

User ID: This will be a unique identifier for each user, such as 552.

Email: This will be the user's school email address (e.g., 552@ school.com).

The challenge is to ensure that whenever a user changes the User ID, the Email textbox is automatically updated to reflect the correct email format. For our case, every user’s email will have the format userid@ school.com, and we want this to happen seamlessly before the form is submitted.

Solution Overview

The solution involves a simple JavaScript function that listens for changes in the User ID textbox. Upon detecting a change, this function will concatenate the User ID with the domain @ school.com and set the resulting string as the value of the Email textbox.

Step-by-Step Implementation

HTML Structure: Create the necessary HTML elements (User ID and Email textboxes).

JavaScript Function: Write a script that listens for changes to the User ID and updates the Email textbox accordingly.

Step 1: Create HTML Textboxes

Begin with a basic HTML structure for your User ID and Email input fields.

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

Step 2: Write the JavaScript Function

Now, let’s implement the JavaScript function that updates the Email textbox.

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

Explanation of the Code

Event Listener: The oninput attribute in the User ID input tag calls the updateEmail() function every time the user types in the User ID field.

Get User ID: The function retrieves the current value of the User ID textbox.

Update Email: If the User ID is not empty, it concatenates the User ID with @ school.com and updates the Email textbox. If the User ID is empty, it clears the Email field.

Conclusion

By following these steps, you can easily implement an automatic email filling functionality in your MVC 5 applications. This not only enhances user experience but also minimizes errors during form submission. The use of JavaScript for this behavior is straightforward and effective.

Feel free to enhance this functionality further as per your application’s requirements, such as validation checks or additional user feedback.

With this approach, your application will become more user-friendly and efficient. Happy coding!