How to Send HTML Input Text Values to a .Net MVC Controller Using Modals

Learn how to pass values from an HTML input text to a .Net MVC controller effectively using Bootstrap modal dialogs.
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Introduction

In modern web applications, modals are frequently used to collect user input without needing to navigate away from the current page. However, one common issue developers face is sending the values from these input fields to a server-side controller, especially when the modal is already presented within a form. In this guide, we will explore a solution for efficiently passing an HTML input text value from a Bootstrap modal to a .NET MVC controller.

The Problem

When you try to utilize an anchor link (styled with ASP.NET Core tag helpers) to send the input value to a controller through the modal interface, you may encounter issues. Specifically, the problem arises because the URL for the anchor link is constructed at page load, meaning you cannot dynamically add values using JavaScript at that moment.

Here's an example of an initial implementation that you might be trying to achieve:

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

This won't work as expected since the asp-route-visiteVirtuelle value is set when the HTML is rendered, not when the user interacts with the modal.

Our Solution

To address this challenge, we can create a JavaScript function that updates the anchor's URL dynamically when the user provides input into the text field.

Step-by-Step Implementation

Set Up the Modal and Input Field:
Ensure you have a modal dialog set up correctly with an input field. We'll add an event listener to the input field to trigger a JavaScript function whenever the input changes.

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

Update the URL Dynamically:
We need a function named ChangeUrl, which will update the anchor tag's href attribute to include the current value of the input field. Here's how you implement it:

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

Complete Working Example:
Here is a complete integrated example that combines everything together:

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

Conclusion

By using JavaScript to dynamically modify the anchor tag's href attribute based on user input, you can effectively send the value from an input field within a modal to a .NET MVC controller. This approach resolves the limitations posed by ASP.NET Core tag helpers while maintaining a smooth user experience. With these steps, you should now be able to confidently implement modals in your application that can send data to your backend without encountering issues.

Don't forget to test this implementation in your application to ensure everything works seamlessly!