Archive For January 2023
Executing async operations onchange in Blazor
calendar_today 10 January 2023 07:35
Blazor's two-way databinding model is extremely powerful, but sometimes
it can get in the way of what you want to do. For example, you might
want to execute an asynchronous operation such as remote validation when a value changes in a
textbox. Perhaps you want to check instantaneously that the value - a username maybe -
doesn't already exist in a database before you accept a new
registration. You cannot add an onchange event handler if
you already have a value bound to the element, so what can you do? In this
article, I look at solutions for both HTML elements and EditForm input
validation components up to an including .NET 7, and a new
feature released in .NET 7.0.1.
