Validating jtextfield updating arecord in access form
Validating user input that is typed into a JText Field can be cumbersome, especially if the input string must be converted to a numeric value such as an int.By subclassing JText Field, however, and overriding its process Key Event() method, (which was added in Java 1.2) it is very easy to control which types of characters may or may not be typed into the field.The APIs even have an example on it's usage, do check it out. Also JFormatted Text Field was introduced in JDK1.4 and even has a more complete set of methods that support validating abitrary values in a JText Field. In addition, you can provide event handler methods in your page or component classes to handle more complex validation scenarios.Finally, Tapestry not only makes it easy to present errors messages to the user, but it can also automatically highlight form fields when validation fails.
Take it easy on me because this is my first time posting.
Tapestry provides support for creating and rendering forms, populating their fields, and validating user input.
For simple cases, input validation is declarative, meaning you simply tell Tapestry what validations to apply to a given field, and it takes care of it on the server and (optionally) on the client as well.
The order of key events is key pressed, key typed and key released.
We can use this technique to validate field’s content on-the-fly.