(A good argument against this practice is also welcome, in case there are new problems that would rise if this validation were implemented; however, that seems a common thing in other languages, so I doubt it is a bad thing to want) This is the best answer I found so far, and I wrote this example based on it.Worked great on FF, Chrome and Safari, kinda worked on IE6 (got a non-fatal stack overflow sometimes, but who cares about IE6), but failed on Opera (and Konqueror, but I don't care much about it either).Form validation can be implemented in a number of different ways.The truth is that none of us filling in forms — there is a lot of evidence to show that users get annoyed by forms, and are one of main things that will cause them to leave and go somewhere else if they are done badly. We want to make filling out web forms as non-horrible as possible, so why do we insist on blocking our users at every turn?it continuously calls the in Not Empty method until it returns a value of true or if the conditional fails for that field it will return false.Give this a shot and let me know if it helps or if you have any questions.Find the below sample screen shot for validating the fields before saving the data Img 3: Validation method Here I have validated the fields using the Boolean method, If all the field values are entered properly it will return true, other wise it will return false and will display an error message.Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format we need to process it successfully, and that it won't break our applications.
Syntactic validation should enforce correct syntax of structured fields (e.g.So, if the user attempts to add or delete characters that will make the input invalid, it reverts to the last saved value. (Not necessarily something I'd do in a real system, though - see nnnnnn's answer) The example fails on Opera 10.63, but since it works on newer versions, it's fine!In the j Query world, it's common to leverage plug-ins for these validation tasks. For (1) you can use these relatively popular plug-ins: Digital Bush's Masked Input Plugin for Jquery.In a Win Form I'm doing initial validation in the Form. To make the code short only three fields are shown in the code.So before saving data, I want to validate whether all the required fields are filled (Text Boxes) by the user. I would rather use a generic function that would be passed each control on the form and based on the type of the control, separate validation logic would be written.