Mvc validating models

30-Apr-2016 21:10 by 9 Comments

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2)Override supports(Class clazz) method 3)Override validate(Object target, Errors errors) method 4)After this we need to inject this custom validator in the controller class and call its validate() method 5)Then check the binding result for any errors and return the appropriate view. Id=valid email id is required. Size.customer.password=Password should be minimum of 8 and maximum of 15 characters.

What's the acceptable amount of times to repeat the same piece of code before we decide to encapsulate the behaviour into something reusable?

A while ago I posted a solution to this using a custom view result.

The thing I don't like about my original approach is that it means I need to write my "Success" code inside a delegate.

The problem is that Model State only contains the properties of the Model that were POSTed to the server and handled by the MVC Model Binder. NET MVC applications your GET "View" is likely to be more complex than your POST "command" - perhaps you have a few Great, now if Model State is invalid, we can rebuild the model and then pass it back to the View.

But wait, we're doing Model State checks in the controller action again!

Getting Started To get started with the additional attributes just install the MVCValidation Extensions nuget package into your solution.

In the previous post, we have seen the form validation using java validations by annotating model class with constraint validation annotations. Id.invalid=valid email id is required. customer.password.empty=Password is required Password.empty=Confirm Password is required empty = Age is required range.invalid = Age should be between 18 to 60 customer.Match = password and confirm password do not match Founder of I love Java and open source technologies and very much passionate about software development.

By using these attributes we no longer need to worry about rebuilding the view model in our POST action. Here's an example using the attribute: attribute on the GET action.

All we do is issue a redirect back to the GET action and our model state will be preserved. As the same suggests, this is instructing the server to populate Model State from Temp Data (if it exists).

The solution (about time, you say) is to accept that a GET is different to a POST and embrace PRG (Post, Redirect, Get). A command is often more simple in its structure than a View.

In most cases, our GET actions are responsible for returning a View, usually represented as HTML but could easily be JSON or XML. For example, it probably doesn't contain any that allows the user to issue a command.

How is this type of request validation any different to decorating your action with a This works fine, most of the time.