Simple example program of validating form using onblur function
This tutorial shows you how to set up a basic form validation with j Query, demonstrated by a registration form.We’re going to use the j Query Validation Plugin to validate our form.
Focusing on an element generally means: “prepare to accept the data here”, so that’s the moment when we can run the code to initialize the required functionality.Please keep in mind that this doesn’t replace server-side validation.It’s still possible for a malicious user to manipulate or bypass the validation rules (e.g. Sam Deering has 15 years of programming and website development experience.But the required setting does or should fire onfocus, since it's hooked up to the CSS :valid/:invalid settings (and I'm not a fan of that: I'm told I'm doing something wrong the moment I'm there, before I've even tried! Also Accessibility Technology are getting told onfocus that the input is invalid. I find it funny that required doesn't work really with pattern. Required seems to only check for empty strings, when you'd think it would check for whatever the input type or other attributes demand... I have to create some ridiculously complicated forms with some optional fields that have to meet certain requirements ONLY if they're filled in, so I will set a pattern that says that there must be pattern, but if it's empty then I don't want it to appear invalid.This is the behaviour that I am seeing in both FF and Chrome at present.
Losing the focus generally means: “the data has been entered”, so we can run the code to check it or even to save it to the server and so on.