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Posted by / 28-Sep-2020 03:15

Validating forms in asp

If you're not using server controls then j Query has a decent validation framework To do that type of validation you need to include the unobtrusive validation scripts They also run off of annotations, which are added when you use Editor For, or Html. If you want to hard-code your selects then you'll need to add the required annotations yourself.

I know you're not using mvc, so I don't know if the razor stuff in Web Matrix comes with these classes, scripts etc.

All of the validation controls derive from the Base Validator class, giving them common methods and properties.

As we mentioned earlier, validation controls execute when the user clicks a Button control, including HTML button controls and server button controls such as the Link Button and Image Button.

Notice in the following screen capture, we can see the Required Field Validator error message display on the form. The user does not wait on a server round trip to discover errors.

This is the exact position the error message will appear if validation fails. This also improves response time on the server because the ASP.

As we will see later in the code-behind file, the Cancel Button will clear all of the fields on the form, and we do not want to validate any of the fields when the user presses this button. If any one of the validation controls on a form fails, the script cancels the postback operation and displays error messages on the form.

If not you might be better just going down the j Query route.

I have used j Query for this purpose, you can also use this!

In the below screenshot, we are validating that the entered data is as expected.

Before accepting data from over the network you need to ensure all of the required fields have been filled out and conform to your formats and business rules. NET provides a number of validation controls to ease the burden of performing validation on both sides of the network. To walk along with the example, create a new web application in Visual Studio . Once the application is setup, right click on the empty web form, select Properties from the context menu, and change the Page Layout property to Flow Layout. Notice we need to check the Is Valid property of the base class before performing any critical action in the submit event.

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For this first example we do not need to place much code into the code-behind file. NET runtime does not waste time processing a request with invalid information.

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