Ensure there are no 404 errors for the script paths.
If you load jquery.validate.unobtrusive.js before jquery.js , it will fail to initialize. Quick questions if you have time: Did this help you find the right download? download jquery.validate.unobtrusive.js
The source code and the latest releases are hosted on the aspnet/jquery-validation-unobtrusive GitHub repository. You can download the dist folder directly to get the minified and non-minified versions. How to Install and Use It Ensure there are no 404 errors for the script paths
According to GeeksforGeeks , the primary benefit is that you don't have to write manual JavaScript for every form. By using "unobtrusive" techniques, the library reads data-val-* attributes that ASP.NET automatically generates on your HTML inputs. This keeps your JavaScript clean and your validation logic centralized in your C# Models. Troubleshooting If validation isn't firing after you download the file: The source code and the latest releases are
As noted in discussions on Stack Overflow , your environment block in ASP.NET Core should look something like this:
To make unobtrusive validation work, you must include the scripts in a specific order. The unobtrusive library is an extension, so it requires both and the core jQuery Validate plugin to function. Add these tags to your _Layout.cshtml or specific view: jQuery : The foundation library. jquery.validate.js : The core validation engine.