Fixing the EditForm Double Submission Issue in Blazor скачать в хорошем качестве

Fixing the EditForm Double Submission Issue in Blazor

Learn how to resolve the issue of `EditForm` in Blazor submitting twice instead of once. This guide provides a clear explanation and solution to ensure your data is saved correctly. --- This video is based on the question https://stackoverflow.com/q/68922608/ asked by the user 'projo9494' ( https://stackoverflow.com/u/14865098/ ) and on the answer https://stackoverflow.com/a/68927402/ provided by the user 'Henk Holterman' ( https://stackoverflow.com/u/60761/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. 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: Blazor EditForm is submitted twice instead of once Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Tackling the Blazor EditForm Double Submission Issue When developing applications using Blazor, you might encounter an unexpected behavior where your EditForm submits twice instead of just once. This can lead to duplicate entries in your database, causing a lot of confusion and potential data integrity issues. In this guide, we’ll explore this problem in-depth and provide a clear solution to prevent your EditForm from submitting multiple times. Understanding the Problem The issue arises when you have both an OnValidSubmit event handler linked to your EditForm and a separate @ onclick event for the submit button. Let's break down the relevant parts of the code: [[See Video to Reveal this Text or Code Snippet]] In this snippet, when you click on the "Save" button: The OnValidSubmit event is triggered, calling SaveProduct(). Simultaneously, the @ onclick event on the submit button is also triggered, calling SaveProduct() again. Consequence of This Setup As a result, you end up with two calls to the SaveProduct() function, which leads to the creation of two identical records in your database. This redundancy is something you’d want to avoid in a well-structured application. Providing a Solution Fortunately, resolving this issue is quite straightforward. The key is to allow the EditForm to handle the submission directly without attaching an additional click handler to the submit button. Here’s the solution: Step 1: Remove @ onclick from the Submit Button Find the submit input field within your EditForm and remove the redundant @ onclick attribute. Update your code as follows: [[See Video to Reveal this Text or Code Snippet]] Step 2: Confirm Functionalities After making this change, clicking the "Save" button will only trigger the OnValidSubmit handler once. The operation to save your product will now execute correctly, ensuring that no duplicate records are created. Benefits of This Approach Simplifies Event Handling: The EditForm handles validation and submission in a clean manner without needing multiple event triggers. Increased Clarity: Developers and collaborators can quickly understand the form's behavior without tracing multiple event calls. Final Thoughts Managing form submissions effectively in Blazor is pivotal for maintaining data integrity. By ensuring that your EditForm only calls the submit action once, you can avoid a range of issues caused by double submissions. This solution not only resolves the immediate issue but also aligns with best practices in Blazor development. If you experience similar issues or have questions regarding Blazor forms, feel free to share your experiences in the comments below!