Скачать или смотреть Resolving Blazor EditForm Multiple Submit Button Issues

Learn how to handle multiple submit buttons in Blazor EditForm while managing validation effectively using custom event handlers.
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This video is based on the question https://stackoverflow.com/q/68127848/ asked by the user 'Shrey' ( https://stackoverflow.com/u/16044437/ ) and on the answer https://stackoverflow.com/a/68129922/ provided by the user 'MrC aka Shaun Curtis' ( https://stackoverflow.com/u/13065781/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The Challenge of Multiple Submit Buttons in Blazor EditForm

As developers working with Blazor, we often encounter a situation where forms contain multiple buttons leading to different actions. A common challenge arises when trying to handle validations specific to each button. Imagine you're working on a Blazor application with an EditForm that captures user inputs but needs to determine the next steps based on whether the user has filled out all required fields.

In this guide, we will explore how to manage multiple submit buttons within a Blazor EditForm. We will outline the problems developers typically face, particularly related to validation, and provide an effective solution to achieve the desired outcome.

Problem Overview

In your existing EditForm, pressing the "Forward" or "Next" buttons should not trigger any actions if the required fields are left empty. Instead, the form should only validate inputs and display an error message as appropriate. You want:

If required fields are left empty: Show validation messages only.

If all values are provided: Show validation messages and perform the intended action (like displaying a notification).

Proposed Solution

To address this issue, we will create custom validation logic within our button event handlers instead of relying solely on Blazor's default submission behavior. This allows us to directly control the validation process for each button.

Steps to Implement Solution

Change Button Types:

Ensure that the buttons intended for non-form submission have their type set to button instead of submit. This prevents them from triggering the default submission behavior.

Manual Validation:

In each button's event handler, perform manual validation on the EditContext. This will allow us to check if the form is valid before proceeding with any additional actions.

Updating the Code:

Modify your existing code by handling validation explicitly within the click handlers of the navigation buttons.

Here’s how your revised code would look:

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

Explanation of Code Changes

Changed the button types for "Forward" and "Next" to type="button" to prevent them from submitting the form.

In the Forward and Review methods, invoked editContext.Validate() to check the validity of the model. If validation fails, an alert is shown to the user prompting them to complete the required fields.

If validation is successful, the respective actions (like showing notifications) are executed.

Conclusion

By following these simple steps, you can effectively manage multiple submits in your Blazor EditForm, ensuring that validations work as intended. This approach not only keeps your code clean but also improves user experience by preventing unintended actions when required fields are empty.

Feel free to adapt this approach in your Blazor applications where you have multiple submit buttons and require comprehensive form validation!