The Blazor Puzzle 64 - Fixing Blazor's Hidden Bug: JavaScript Event Handling Mistake Explained @DeveloperExpress

Uploaded January 2025 | Updated September 2026, 2 weeks ago

Are your Blazor apps registering multiple JavaScript event handlers and causing unexpected behavior? In this episode of Blazor Puzzle (#64), Carl Franklin (AppVNext) and Jeff Fritz (Microsoft) explore a hidden bug in handling JavaScript keydown events in .NET 9 Blazor web apps.

You'll learn: ✅ How JavaScript event handlers persist across Blazor pages
✅ Why net object reference leaks memory if not cleaned up
✅ The right way to dispose of global event listeners in Blazor
✅ How Playwright and XUnit help test Blazor apps

🚀 Watch as we debug and fix this issue using proper cleanup techniques to optimize performance.

🔔 Subscribe for more Blazor puzzles and .NET deep dives!

Repo Link - github.com/blazorPuzzle/Puzzle-64

Get Started Today – Free 30 Day Trial
dxpr.es/NUGET
dxpr.es/FREE-TRIAL

Pricing and Online Demos
dxpr.es/BUY
dxpr.es/DEMOS

We Are Here to Help
dxpr.es/SUPPORT

Follow DevExpress on Social Media
dxpr.es/FACEBOOK
dxpr.es/TWITTER
dxpr.es/BLOGS

Review Customer Testimonials
dxpr.es/TESTIMONIALS
dxpr.es/MARKETPLACE

#DevExpress, #devexpress_blazor #blazor #microsoft #carlfranklin #Jefffritz #Blazor #DotNet #JavaScript #WebDevelopment #Playwright #XUnit #Coding #Microsoft

The Blazor Puzzle 64 - Fixing Blazors Hidden Bug: JavaScript Event Handling Mistake Explained

DevExtreme React with Don and Gregory: DX Cloud Part 5

$The Blazor Puzzle 76 - How to Manage Multiple Config Environments in Blazor In Episode 76 of The Blazor Puzzle, Carl Franklin and Jeff Fritz dive into a real-world developer challenge: 👉 How do you support multiple Blazor environments (like QA, Training, or Client-specific deployments) without constantly renaming JSON files or hacking your code? Jeff walks through the right way to manage environment-specific configuration using .NET’s built-in appsettings.{Environment}.json pattern, custom environment names (not just Development and Production), and clever use of environment variables—including in Azure deployments. 🔧 What Youll Learn: ✔️ How to set up and switch between environment-specific config files ✔️ How to pass environment names using launchSettings.json or environment variables ✔️ How to override config settings like feature flags (e.g., AllowWeather) ✔️ How to display a dynamic corner ribbon UI to show which environment youre in ✔️ How to keep your Blazor app clean, multi-environment, and user-aware 🎁 BONUS: Jeff includes a reusable Blazor component (EnvironmentRibbon.razor) to visually mark your environment in the browser! 📫 Have a config conundrum or a puzzling Blazor problem? Send it to blazorpuzzle@appvnext.com — and you could win a Blazor Puzzle mug! 🔗 Resources & Code: https://github.com/BlazorPuzzle/Puzzle-76 📌 Want to level up your Blazor testing skills? Subscribe & join the puzzle! 🧩 Get Started Today – Free 30 Day Trial http://dxpr.es/NUGET http://dxpr.es/FREE-TRIAL Pricing and Online Demos http://dxpr.es/BUY http://dxpr.es/DEMOS We Are Here to Help http://dxpr.es/SUPPORT Follow DevExpress on Social Media http://dxpr.es/FACEBOOK http://dxpr.es/TWITTER http://dxpr.es/BLOGS Review Customer Testimonials http://dxpr.es/TESTIMONIALS http://dxpr.es/MARKETPLACE #DevExpress, #devexpress_blazor #blazor #microsoft #carlfranklin #Jefffritz #Blazor #DotNet #AppSettings #EnvironmentVariables #MultiTenant #WebDev #BlazorPuzzle #FeatureFlags #ASPNETCore$

Why Upgrade to .NET 10?: Carl Franklins Blazor Train ep 109

Live Sessions with Amanda and Don : Creating a Tic Tac Toe Game using Blazor.

Get Started With the Radial Gauge and Progress Bar Control for .NET MAUI