ASP. net mvc + LINQ develop a book sales site (8): Form Verification

We use addcategory (for example, the page for adding a library directory). We require that the directory name cannot be blank.

1. Modify addcategory. aspx

2. Create a New formvalidate. js file in the content directory.

3. We can't forget the backend verification and modify the categorycontroller.

Question 1: I originally wanted to return directly if it is empty, but the page is blank, I can only rerender view the current page, but if there is data from the last request on the page, I can only re-execute the previous action. If there is no parameter, it will take, if there is a parameter, do you have to save it all, that friend knows?

4. Results

A. No input content, focus left

B. After the content is entered, the focus is removed.

Question 2: If this is used, you have to write JavaScript yourself. How can the convenient Verification Mechanism of webform be used in MVC?