Therefore I was out on the hunt for a function in Java Script which can help.
In this example we are looking into client side validation which will validate numbers, so if we have an input for a number we want to make sure this data entered is in fact a number.
For production applications, developers often end up spending a lot more time and code on this task than we would like. NET page framework, it was important to try and make the task of validating input a lot easer than it has been in the past.
In HTML 3.2, validating data is a difficult process.
The validator controls are the main elements of the solution. NET control that checks a specific validity condition of another control.
This is why it's important to do both server side and client side validation.
Using the onkeypress event, we could create on-the-fly form validation. The idea is to use the onkeypress event handler inside the form field to check, so as the user types, it is being validated concurrently.
Here's an example that limits a form field to contain only numeric input (on the fly, of course! Try typing in stuff other than numbers into the above box- you can't. By checking to see whether the keycode of the key pressed as the user types falls within the range of the number keys (48~57), and if not, returns false, which disables the keypress action.
(11 printed pages) Introduction The Problem The Objective The Solution-Overview Client Features What Is a Validator?
Validator Walk-Through It's Not Voluntary Getting Regular Comparing Apples and Apples Custom Fit The Finale Sample Code Validating user input is a common scenario in a Web-based application.