Validating forms in asp
Place four controls from the Web forms section of the Toolbox onto the form. If Is Valid returns a value of true then all of the validation checks were successful.Drag one Text Box control and give it an ID of First Name Text Box, two Button controls (Submit Button and Cancel Button), and one Required Field Validator (First Name Required Field Validator). The following screen shows the form in action, and the user has pressed the Submit button without entering any text into the textbox. The Required Field Validator fails when the value in the associated control matches the value of the Initial Value property of the Required Field Validator.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.The complete listing for Web Form1cs is shown below. You can disable any of the validation controls by setting the Enabled property to false.
I have used j Query for this purpose, you can also use this!With an added advantage that if the client disabled JS the form is still submitted on the server.The only time you'll need to write your own JS is if you want to implement the Custom Validator, but all the others know what JS to write themselves.Validation of user input is necessary task for the application programmer.An application should allow only valid user input so that we get only desired information. NET MVC framework provides built-in annotations that we can apply on Model properties.
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However, to make sure that the function runs each time a button is pressed you will use onkeyup.