How to Reset Dropdown Value Before Submit in JavaScript

Показать описание

Discover how to effectively reset the second dropdown value before submission when the first dropdown's selection changes using JavaScript and Bootstrap 5.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Reset Dropdown value before Submit

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Reset Dropdown Value Before Submit in JavaScript

Dropdown menus are a common feature in web forms, allowing users to select from a predefined list of options. However, sometimes you may encounter a situation where you need to reset one dropdown's selection based on changes made to another. This guide will address this issue and provide an effective solution for resetting the second dropdown value before submission, particularly when using JavaScript alongside Bootstrap 5.

The Problem

Consider you have two dropdown lists on your web form. The first dropdown is used to determine a selection, while the second dropdown's options are dependent on the first. You want to ensure that whenever the value of the first dropdown is changed, the second dropdown resets to its default state before the form is submitted. Without this function, the previously selected value of the second dropdown is retained and sent along with the form data, which can lead to errors or unintended submissions.

In this scenario, you will not be using a submit button; the form will submit automatically whenever a change occurs in either of the dropdowns. Below is a simplified version of the code at hand:

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

The Solution

To resolve this issue, we will use jQuery to listen for changes on both dropdowns. When the first dropdown changes, we will reset the second dropdown's selected value, ensuring that the correct value is submitted. Below are the steps you'll need to implement this solution effectively.

Step 1: Include jQuery

First, make sure to include jQuery in your HTML file, as it will simplify DOM manipulations. You can add the following line in the <head> section:

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

Step 2: Set Up the Form and Dropdowns

Here’s how your HTML should look, properly structured within a form:

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

Step 3: Implement the Change Listener

Now, let's write the jQuery code to handle the change events for the dropdowns. We will reset the second dropdown when a change is detected in the first dropdown.

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

Explanation of the Code

Event Listener: The on('change', ...) method attaches an event handler function for the change event on both dropdowns.

Condition Check: Inside the handler, we check if the source of the change event is the first dropdown. If it is, we reset the second dropdown using $('-second').val('').

Conclusion

By following these steps, you can ensure that the second dropdown will always reset its value correctly in response to changes in the first dropdown. This functionality ensures that you avoid sending outdated selections alongside your form data.

Feel free to integrate this solution into your projects that involve dropdown menus, and enhance your users' experience with more reliable data submissions. Happy coding!