function form Validation() // Function that checks whether input text is numeric or not.
function text Numeric(inputtext, alert Msg) // Function that checks whether input text is an alphabetic character or not.
However, this doesn't disable support for the constraint validation API nor the application of the CSS pseudo-class or other As you can see, the HTML is almost the same; we just removed the HTML validation features.
Checking for form completion: The first step of form validation is to check, whether the user have entered information in all the fields or not.
If the string value is numeric, it will return true, otherwise it will return false.
Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format that we need to process it successfully, and that it won't break our applications.
We also want to help our users to fill out our forms correctly and not get frustrated when trying to use our apps.