To include a Validation expression click on the Expression icon (). Delete a related validation by clicking the trash can icon (). Edit a related validation by clicking on the Name of the expression or the Expression icon (). Create a new Validation expression by clicking on the Expression icon (). Data validation rules can be defined and designed using any of various methodologies, and be deployed in any of various contexts.Data validation rules may be defined, designed and deployed, for example: Definition and design contexts: Data that does not conform to these rules will negatively affect business process execution.A text field becomes the first responder automatically when the user taps it.You can also force a text field to become the first responder by calling its Note The appearance of the keyboard has the potential to obscure portions of your user interface.In computer science, data validation is the process of ensuring that a program operates on clean, correct and useful data.It uses routines, often called "validation rules" "validation constraints" or "check routines", that check for correctness, meaningfulness, and security of data that are input to the system.
My problem is that if a user enters a phone number of less than 10 characters long, the validation does not stop the user and flag an error.You can download the JSONLint source code on Git Hub.I am using the masked edit extender and validation controls on a text box that is to hold a phone number entered by a user on the web page.You use text fields to gather text-based input from the user using the onscreen keyboard.The keyboard is configurable for many different types of input such as plain text, emails, numbers, and so on.